Thursday, September 17, 2020


Our 600 amp Dual Rectifier, dual battery isolator devices are found on some amazing vehicles, including these animals used by the US Coast Guard.

Thursday, October 17, 2019

Bryan B, Daimler Trucks, Vehicle Test & Validation Engineer

Hi Scott,

Just wanted to follow up, we have put ~15,000 miles on our test trucks that have your equipment on them, in all sorts of weather, with not one single issue. The minimal voltage drop and small footprint are perfect for us!

Thank you again!

Wednesday, August 22, 2018

Lowell W., Africa

Lowell W. works in Tanzania for an NGO.

So happy to have been a customer all these [eleven] years.  

Very happy with my purchase and all the good service it has provided.  

I estimate I have pulled my trailer over 125,000 miles and the Perfect Switch has done its job all the way.  

Will be happy to have it aboard the new rig, even in a different role! (Lithium-Ion battery application)

Wednesday, August 15, 2018

Things don't always go as planned.

Image result for mgm resorts logo

From: Sam P. [mailto:omitted]
Sent: Sunday, August 12, 2018 3:22 PM
To: 'Perfect Switch'
Subject: RE: excitation source

Hi Scott,

I thought I'd drop you a note and let you know of our experience with this setup.  1.8 miles into the beginning of the Rubicon trail last week, our 89 [JEEP] YJ started its little habit of overheating.  I thought I could cope with it intermittently during the trip but it opened up a myriad of other problems causing us to turn around.  The primary issue that screwed us out of the Rubicon was a very expensive alternator I installed about 18 months ago.  It didn't like all the heat and began to fail.  The result was a total loss of power as it shut down.  The net result was the primary battery was depleted and the engine eventually gave out too.  After letting it all cool for a bit, the only way to start the Jeep was through the system you helped me build with the dual battery and your Perfect Switch isolator.  Initially, it didn't work until I learned that activating the "jumper switch" required a second or two to do its job.  Once I figured that out, the truck started up every time.  We had to limp the Jeep back to the car trailer, stopping and starting some 20-30 times.  It took 3 hours of this to complete our self-rescue.  The point being is, this system worked.  If I had not set my dual battery setup with your product, it potentially could have been a long and expensive tow.  Now that I think about it, you probably saved me around $1500 bucks.
Thank you for your personal attention to my little project and building a successful system.  I guess I'm left with one question;  Temperatures of up to 270 F, should I be worried of damage to the isolator?

Sam P.

Thursday, August 9, 2018

Unique Mining Application

In our line of business, as engineers who provide switching components, we're generally focussed on our small portion of a larger electrical system. Often, we have no idea what the larger system is or what it's for, so it's always interesting to learn where Perfect Switch components go once they leave our facility.
We recently learned that a long-term customer that provides support to the oil and gas industry in Canada is also involved in the mining industry. One of their laudable goals is to rid the underground mining industry of diesel vehicles in lieu of battery electric equipment in order to improve health and safety, reduce greenhouse gas emissions, and decrease operating costs by reducing below ground ventilation infrastructure like shafts and equipment.
To that end, Goldcorp Borden Lake, Maclean Engineering, and Medatech collaborated on an initial project to electrify a motor grader for mining use.
Perfect Switch devices were programmed to suit the customer's needs and now play a small part in a large and forward-thinking project to better the mining industry.

Wednesday, September 13, 2017

Russell S. Work Van application

Russ S, work van application, Vancouver, WA  

1996 Dodge Grand Caravan (Manavan) work van. 
Roof mounted, 318 watts of Canadian Solar, solar panel.
BlueSky SB3000i controller. Plus, Pro IPN remote and 500A shunt. 
2 amp auxiliary start battery charge circuit enabled to maintain the start battery.
Giving a charging capability of 22 amps .
Quantity of 2- 6v Trojan 105 batteries in series for 225AH of 12 volts.
I discharge overnight 32 amp hours running a refrigerator.
I run a Mean Well TS-1500 PSW Inverter
I live in a cloudy region.
I consume too much power for the limited sunlight available.
The solution I needed is to get my alternator to provide bulk amps at it's limited voltage of maximum 14.4 volts ( less with temperature compensation ) and finish charging with the higher settings of the BlueSky 3000i set to the charging parameters of the Trojan 105's which is 14.8v bulk / absorption and 13.5v float.

Equalization voltage of 16.2v for 30 minutes every 20 days.
An alternator will not charge the Trojan 105's at the parameters set by Dodge on my van. 

Solar charging is augmented with the van's alternator through the Perfect Switch Dual Rectifier, 200 amps.
One alternator input, two battery output isolation with combiner feature.
Reason for this as the solution over a Diode isolator or VSR: 
  1. Alternator only puts out max of 14.4v computer regulated, temp comp'd.
  2. A diode isolator drops .6 to 1 volt. 
  3. A VSR will connect in circuit, when the van is running, the house batteries and the start battery, charging to a maximum of 14.4v.

I used twin 6ga aircraft cables from the Power Gate to the house batteries, so not even a 1/10 of a volt drop to the house batteries.

When the vehicle is shut off, the solar will charge the house batteries to 14.8 volts. When the van is restarted, the VSR will connect the batteries in circuit to the start battery and the house batteries will discharge to the start battery, thereby wasting the solar charging of the house batteries.

The DR200 Perfect Switch is amazing in  that it allows charging to 14.8 volts from the solar panel while driving because its comparator will disconnect it from the alternator eliminating the solar side from back-feeding the alternator.  

It keeps the start and house batteries separate and lets the house battery take a higher charge from the solar.

The combine feature allows me to connect the house and start batteries in circuit for emergency. self-jump start situations.   All with only 35 millivolt drop at 200a, not .6-1v like a diode heat-sink will do.

Monday, July 24, 2017

Trinity Diversified Inc. , Leading manufacturer of highway marking machinery.

Trinity Diversified Inc. is the largest highway striper manufacturer in the Southwest United States. They custom manufacture truck mounted, long-line, airless paint striper's up to 33,000 GVW, legend marking trucks (stencil trucks), self-propelled highway line striper's, centerline, side gun mounted, and the new addition of RPM's (button) application bodies.

Owner John Foster:

We manufacture Highway Marking Machinery.. I spoke with Scott Stolper about an application for a 220 amp battery isolation system on a 2017 Ford Super Duty. Although not the cheapest, he assured me their Perfect Switch 300 Amp Dual Rectifier 4th Gen would work best for our application. After hookup of the system, it worked right off. I called to thank him and let him know it worked very well for us, and he mentioned this comment area, so once again thank you. "

Monday, August 15, 2016

John A. High Amp Stereo Application

The 150 to 300 Amp Dual Rectifier option is ideal for high power mobile audio or competition applications.  Audio systems with multiple batteries require high current isolation from the main battery.  Unlike solenoids that wait to switch until the main battery voltage drops, or compromise with a large heat-sink type isolator with a huge voltage drop, with the low heat dissipation from the Perfect Switch isolator you get max current of a solenoid but without the current draw and the excess heat.

Friday, June 5, 2015

Randy N, Car Care Tow Pro, Lincoln City, OR   

Exceptional customer service in both the technical and sales department.
We trust this unit when in very remote areas on our recovery vehicles , where equipment failure is not an option. Exceeds all expectations
Ben B, Kinder-Morgan   

My POWER-GATE installation was very smooth. It is operating as advertised with no issues. I recently returned from a trip to Tucson, Arizona where the average temperature was 97 degrees in the shade. I spent a week on unimproved or non maintained roads. High vibration, high heat, high electrical demand. I had no issues. Great product. Complete install instructions. I have told several people to purchase.

Brunswick Commercial and Government Products

David A, Brunswick Commercial and Government Products   
Scott and his team at Perfect Switch have developed an excellent product and have provided us with wonderful customer service as well. Their POWER-GATE rectifier isolators can be custom made for any configuration and we are currently using them for numerous different engine and battery system configurations. I would highly recommend their product and company to others!!

Thursday, June 4, 2015

Monroe Truck Equipment

Andy H, Monroe Truck Equipment, Monroe, WI  

We were using Sure Power isolators for a relatively high demand electrical system. With just 8 prototypes in the field, we had 100% failure rate and less than desirable service from the manufacturer. I found POWER-GATE on-line in a Google search. It looked to be able to provide everything we needed. I called in and discussed the application. Service was prompt and professional. It is a considerably more expensive product than the Sure Power but we have been up and running for several months with no issues. Installation was easy and I would definitely recommend.

Wednesday, May 14, 2014

Ed R., of Camden, AR  

I got a Dual Rectifier Power Gate for a competition audio system in my truck. Unlike most isolators, the almost non-existent voltage drop really gets the judges attention. It works flawlessly. Very well built and extremely compact. I would recommend these to anyone.

Thursday, May 8, 2014

Trae Drose, University Laundry, Director of Fleet and Equipment

I've purchased 20+ isolators and bi-directional relays over the past 5 years for our fleet at University Laundry. These units have performed extremely well in various climates across the country. I really like how easy the units are to install. Once it's installed they don't require any maintenance or monitoring. We've been using the first isolators we purchased for 5 years and they are still running strong. Many of these units are mounted to the frames of our trucks and exposed to the elements. What is even better than the products is the customer support. Seriously, when the company owner replies to calls and emails, many times within minutes, I couldn't ask for more as far as customer support. I've recommended Perfect Switch to weekend adventurer trying to maintain batteries for camping and winching to the over the road driver powering everything on his rig 365 days a year.
Trae Drose
University Laundry
Director of Fleet and Equipment

Friday, May 2, 2014

John F. of Layton, UT

My install was a bit different but everything seems to be working great. The setup is an off-grid solar system with two battery banks of differing age. Because of the low voltage drop and high efficiency, the dual rectifier POWER-GATE was the best I could find. It took a little time to get all the components to work together, but Scott at Perfect Switch was more than willing to see it through. It is a good product, I do recommend it. John

Derek W. of Camas, WA

I just installed the POWER-GATE Dual Rectfier on my wakeboarding boat. I have two batteries and had issues in the past with the Perfect Pass cruise control (very voltage sensitive). Previously, I had a standard battery isolator but the voltage drop was too high. My Perfect Pass would freak out when I turned the heater on and my amps weren't getting all the power I wanted them to get.

The POWER-GATE was the perfect solution. After checking the voltage at each connection, I find that I lose less than .05 volts through this device. Outstanding! Installation and connections were a breeze. Another neat feature is the battery combine feature. I used to carry jumper cables just in case I needed to jump-start the starter battery from the Aux battery. With POWER-GATE, I installed a momentary switch on my dashboard that combines the batteries briefly if I ever need to jump start the boat.

All in all, this is a more pricey device, but it is the very best. That's why I bought it and that's why you should buy it. No more worrying or electrical issues to deal with, just fun on the water :)

Paul M., Snap-on Franchise Owner, Stratford, CT

I was admittedly skeptical about the value and cost of the POWER-GATE unit I purchased. While reasearching information on-line to be an informed consumer, I came upon the POWER-GATE site and the concept of their product was appealing. Though not a mechanic and certainly not an electronics expert, I do understand voltage drops and the fact that where there is heat, there is energy loss. The company, their product, and their integrity were an unknown to me so I was hesitant to spend the additional money for a POWER-GATE over the model that failed which I was replacing. 
Fortunately, my skepticism was overridden by the explanation of the design by speaking with a representative. Though still skeptical about the price, I ordered it anyways. After an easy installation, I was (and still am) blown away by the remarkable difference in performance of the unit and how it has saved me so much fuel idling to recharge the system during the day. 
Put your skepticism behind you. It would be much more expensive NOT to purchase a POWER-GATE and opt for a lesser design. There IS a difference and I would recommend this company any their product to anyone who has an auxiliary system for power. Higher efficiency, less heat, more voltage, better battery life and much, much lower operating costs.

Thursday, December 5, 2013

Juan E., of Mexico,

From Evaluacion Integral de Obras Civiles, use of Single Rectifier, 300 amp devices in industrial machine:

Original Post:

"Primero que nada quiero mencionar que yo me encuentro en México y adquirí el producto directamente con Scott.  Estoy muy satisfecho con el producto adquirido con POWER-GATE que fue un diodo rectificador sencillo, el servicio fue muy bueno desde que me puse en contacto con Scott, en mi caso ya sabia exactamente el producto que necesitaba, pero aun así me proporcionaron información técnica del diodo el cual use para la instalación de una batería de respaldo para un procesador montado en un equipo que se usa para estudios de pavimentos, el diodo fue muy fácil de instalar, y hasta el momento sigue funcionando a la perfección, sin duda recomendaría a POWER-GATE por su buen servicio y calidad en sus productos."


"First of all I want to mention that I am in Mexico and purchased this product directly from Scott. I am very satisfied with the product purchased with POWER-GATE [which] was a simple rectifier diode, the service was very good since I got in touch with Scott, [and] in my case [he] knew exactly the product I needed, but still provided technical information [to] use the diode [and] install a battery backup for a computer processor used for the study of pavement.  The diode was very easy to install, and so far it is working perfectly.  I would definitely recommend to POWER-GATE for good service and quality products.

Wednesday, May 29, 2013

Nick W. of Lees Summit, MO Submitted February 19, 2013

I needed separate power supply to inverter that controls electronics and laser jet printer within my work truck and didn't want it draining primary battery. The service at Perfect Switch is great. Called only a few times and even when i was installing they were most helpfull on phone all while i was physically installing.

Installation was so easy i was scared i was doing it wrong and that's why I called.

I would recommend POWER-GATE to everyone who needs superior switched power product.

Dan S. of Reno, NV Submitted February 24, 2013

I've had the Power-Gate dual rectifier installed on my '99 Toyota Land Cruiser since 2009 and it has performed perfectly and to expectation for my dual battery set-up.

I considered other isolator systems but liked the overall simplicity, small form factor and customer service promise from Perfect Switch. I did have a few questions during the install process which Scott answered very quickly.

I have and will continue to recommend the Power-Gate battery isolator systems based upon product performance and the commitment of Perfect Switch to the end-user.

Rivera Music & Sound, Tyrone Rivera of Cobb, CA submitted February 17, 2013

Power-Gate is the best Switching unit I have come across. It looks great in my custom Toyota Four Wheel Drive Custom 1999' Tocoma. I was easy to install. It is a true military grade switching unit . When it come to having a unit as important as a battery switching unit go with the BEST ... The Power Gate is the best by far..

James P. of Sylmar, CA Submitted February 8, 2013

P.S. I love you! Not the Beatles song but Power Switch I love you!
After major inquiries and web surfing into a battery charging station used in conjunction with my house battery, an odyssey, I have found the no maintenance reliability to be exceptional.
After a night of watching TV with the inverter I can start up and travel knowing that the battery will be fully charged when I stop for the night.
Installation was easy, I let my RV repair shop perform the installation along with other work I was having done. Quite a few of the staff asked me where I purchased the unit and I explained that every Class A and C unit they sell should have one installed. I also expressed my concern over old style battery charge splitters to be obsolete with the P.S. Power Gate. I hope they listened to my "endorsement" of your product. They did want me to get back to them after I've tested the Power Gate. I gave the unit a very high reccomendation.

Cellcom, Ron Wesoloski, Electrical Engineer, Submitted February 22, 2013

Hi, Perfect Switch, LLC:
My name is Ron Wesoloski, and I am the RF Engineer responsible for Microwave Communications and Renewable Energy Systems for Cellcom's wireless communications systems in northeast Wisconsin and Michigan's Upper Peninsula.
We chose the POWER-GATE for one of our renewable energy cell sites located on an island.
This site needed to have 2 separate deep-cycle battery banks coupled together by a POWER-GATE device. This device allows charging of both battery banks and yet isolates the smaller of the 2 for critical loads, such as the Microwave Link and the Remote Monitoring/Control Systems at the site, from our headquarters in Green Bay, Wisconsin.
The device installation went very smoothly, with a couple of mounting screws and 2 power terminals to connect. Since installing this device, the 24x7 Microwave Link and the Remote Monitoring/Control Systems have never gone down, even though a few times the larger battery bank has discharged to the point where the low-voltage-disconnect activated and shut off all of the other, larger loads that run 24x7 otherwise. It has operated without any issues whatsoever since it was installed back in 2009.
We would recommend the POWER-GATE to others using, or thinking of using, a dual-battery bank, which is especially important for renewable energy systems.
Respectfully Submitted,
-Ron Wesoloski

Lee B. of Waldport, Oregon Submitted May 2, 2013

This may be a bit wordy....the subject is both simple and complex simultaneously.

I chose to purchase the Power-Gate MosFET battery isolator even though the initial capital expense was easily three-fold that of the competition through normal auto parts suppliers. For me the choice was simple....superior power handling and longevity -vs- price alone. When the standard isolator fails in service, the failure mode is normally a short rather than an open circuit...this mode leaves the alternator and BOTH battery banks connected as if there were NO ISOLATOR in the loop. The normal result is then to see your alternator fail shortly thereafter without warning. One additional technical consideration that weighed heavily on my choice was the superior current handling (measured as a voltage-drop at the isolator) that the POWER-GATE provided....literally, the drop is too small to measure without especially sensitive test equipment. This means that the output from my alternator is properly delivered to the DC distribution network downstream without loss to heat generated by the battery isolator itself....this is why the POWER-GATE doesn't require a big multi-finned aluminum heat sink to survive. I did make one significant change to my downstream DC wiring for the chassis battery bank....I replaced the factory original #6 gauge cable run from the isolator to the starter post (where it ties directly to the chassis battery) with a high current #0 gauge multi-stranded cable with soldered lugs. Again, the result was to minimize resistance-induced heat and voltage drop losses.

Would I recommend this device to other RV installations? Absolutely!!! The tour I got of the facility where these are made completely convinced me of the quality and capability that the POWER-GATE unit was documented in testing prior to delivery as capable well beyond the 140 Amps my alternator provides (a close to 30% over-amperage capacity). The firmware programming (that's right, it's a smart device) that allows for exciter voltage to be delivered to the alternator on startup is brilliant....and still retains full protection against reverse current flow to protect the regulator circuitry within the alternator.

I found it simple to install, much more compact than the unit it replaced, and so well-engineered as to provide me with a sense of confidence that it will last longer than the vehicle itself.

So, if your RV utilizes a conventional (finned) battery isolator and you want to make your system better, this is a great alternative.

Saturday, June 23, 2012

In a world where everything is claimed to be "best," what does "best" really mean?

If one looks up the definition of "best," it's clear that being best is not only subjective, but also tough to quantify.  So when we say a POWER-GATE battery isolator is the best battery isolator on the market, are we just being arrogant?  Are we just taking the same marketing liberties that we as the consuming public see day in and day out?  The "best" pizza in town.  The "best" battery money can buy.  The "best" window washing company.  The concept of "best" has become so commonplace that we've lost touch with what "best" really means.

So how does one define or measure the "best" battery isolator if every manufacturer claims to offer the "best."  From our perspective, it's very simple:  to measure the efficiency of  isolators (also known as rectifiers), you need to know what the voltage drop is at a given current level.  Many companies try to impress buyers by offering a zero or no-voltage-drop isolator.  This of course defies the laws of physics, but they hope the buyer doesn't know that.

At very low current levels, the voltage drop through any isolator will be very low.  But what is the voltage drop at 100 amps?  200 amps? or 300 amps?  The voltage drop at these elevated current levels is what truly makes POWER-GATE "best."  And we say that not because we are arrogant, it's because the numbers don't lie.

Perfect Switch, LLC owns the patent on a unique assembly process where the use of arrayed MOSFET's yields the absolute lowest resistance from the input to the output of a device. The resistance is so insignificant that heat sinking and airflow are not necessary.  So as you compare devices for your DC power management needs, if it looks like a giant heat sink, it does so for a dissipate heat.  If it were a "zero voltage drop" device, it would dissipate no heat and if it dissipates no heat, why does it look like a giant heat sink?  If it looks like a duck and quacks like a duck, you guessed's a duck.

We've scoured the earth looking for competing technologies and we can say with absolute certainty that when you buy a POWER-GATE battery isolator, or you add a POWER-GATE solid state relay to your electrical system, you are buying the "best" that technology has to offer.

Thursday, June 21, 2012

The ideal the POWER-GATE battery isolator became the best.

H. Frank Fogleman is a DC power management expert and the inventor of the internationally patented POWER-GATE arrayed MOSFET technology.  He resides in Rancho Santa Fe, California.

When George Westinghouse set up AC power transmission systems in America, he was primarily concerned with providing power to remote locations for lighting homes without using gas or kerosene lamps. That was going well, but people wanted to use the available power to recharge batteries powering radios and vehicles. Yes, there was the Baker electric car like the one that President Monroe had introduced to the White House; one catch, to convert the AC to DC, a rectifier was needed….. a rectifier to conduct during the positive part of the line voltage and block during the negative half of each cycle, making it suitable for recharging storage batteries.

The first wide-spread use of AC rectification was the use of mercury vapor tubes to produce Direct Current for the “Third rail” excitation for railways. The mercury vapor rectifier soon became deployed in room-sized units that remained in service for decades. There were much smaller units used in photography and metal treating facilities.              

Next came copper-oxide and selenium rectifiers for lower current applications
in the 1950’s.  Germanium diodes were used for low voltage ( 40 to 100 ) applications which only required current capacity in the fractional ampere range.

Then silicon diodes became available offering much higher blocking voltage ratings with a substantial increase in current capacity. The down-side was (and still is) the forward voltage drop which results in high heat dissipation in multi-amp applications. They are still in wide-spread use today mounted on extremely large heat sinks and often require additional air cooling fans. The Schottky diode hit the market in the late eighties with a lower voltage drop but a jump in cost and reduction in current capability.

At the end of the century, MOSFET rectifiers were introduced, but price and other factors prevented them from becoming the success developers envisioned.  That was when I found a need for a superior rectifier in DC power management applications. 

Looking at what was commercially available, I could see that the engineers using MOSFETS didn’t have thermodynamic experience.  At this point, a large array of MOSFETS was successfully engineered and the POWER-GATE concept was born. Patents were issued in countries around the world and Perfect Switch, LLC set out to market the arrayed MOSFET devices in the form of rectifiers, relays, and OR’ing devices. POWER-GATE devices are smaller, lighter, and more efficient than any other competing technology.  Early adopters of this new technology include tough vehicular applications including military and fleet utility, aircraft, marine, and communications markets.

Wednesday, April 11, 2012

Why POWER-GATE solid state MOSFET battery isolators over mechanical switches, relays, and solenoids

Why do people use mechanical relays, switches, and solenoids as battery isolators?

Very simply, they're cheap and easy to understand, but in no way should they be considered a battery isolator for high current DC applications.

A very common, old-school way of creating battery isolation is to install a starter solenoid (relay) between two batteries, and have that solenoid close the connection between the two batteries when the vehicle is running. When the vehicle is shut off, the solenoid will open creating "isolated" batteries. This works great on paper, but if one of the batteries is deeply discharged, when the solenoid is closed, the current transfer from the "full" battery to the "low" battery can exhibit very high inrush current creating a possible fire danger if the wiring, plugs, and/or the solenoid overheat. It's not uncommon for solenoids, relays, and/or switches to become stuck when mechanical contacts effectively weld closed under high current, high arc'ing conditions. This can lead to a situation where the user thinks that the mechanical disconnect is open when in fact it is stuck closed and therefore, no disconnect is occurring.

Another serious problem is when the engine is stopped shortly after starting. The two batteries have been connected during the cranking, starting, and running process just long enough to cause the cranking battery to discharge into the auxiliary battery and now the vehicle will not restart. If the auxiliary battery is of a low voltage potential, the main battery WILL
discharge into the auxiliary and the engine may have to be operated for a considerable period of time before it may be safely turned off. Many an engine has failed to restart because of this problem.

The constant opening and closing of mechanical disconnects also lead to high resistance, high heat connections.

When contacts are new and flat, they yield low resistance transfer of current which means little heat dissipated. However, each time the contacts open and close, an arc is generated. The greater the current and/or difference in voltage, the larger the arc. In short order, the contacts are no longer perfectly flat and are instead pitted and deformed. What was an efficient transfer of current has become poor conductor of current and the additional resistance yields heat which will be the ultimate demise of the mechanical connection. It's not a matter of if it will occur, it's a matter of absolute deterioration over time guaranteed to end in thermal failure.

MOSFET-based battery isolators, specifically the patented POWER-GATE single rectifiers and dual rectifiers have no moving or mechanical parts. There is no arc'ing and no deterioration in performance over time. Unlike typical silicon and Schottky diode isolators or rectifiers, POWER-GATE devices achieve ultra-low resistance....we invented and patented the technology to achieve the lowest resistance devices in the marketplace. There is no such thing as a "no resistance" isolator and until someone figures out how to defy the laws of physics, when it comes to advanced, solid state battery isolator technology, POWER-GATE is the ultimate choice for high reliability systems.

Wednesday, December 17, 2008

RE: Perfect Switch Contact Request!!!

Dear Scott,

I am writing to let you know that I received the Perfect Switch that I ordered and I now have it installed in my 1991 Chevrolet G30 Sportvan. I want to thank you for all of your knowledgeable help and great conversation. The switch is working just as you describe....."Perfectly". I could not believe my eyes when I checked the voltage drop and it was practically zero. The installation was also as you described, simple and straight forward. There are not too many products that anyone can proudly boast about anymore, but you can be assured that this is definitely one of them. American made and top notch! I will be recommending the "Perfect Switch" to everyone I know that needs a dual battery set-up. Thanks again and keep up the great product development.

Best regards,Carlos Baez
Manitowoc, WI

Thursday, June 28, 2007

TIGE Wakeboard Boat...problem solved

Just wanted to let you guys know that the SR-150 showed up today. It
was a breeze to install and was an amazing improvement over the
Charles Marine Isolator that was originally installed. Our customer
had a low voltage complaint and I was seeing .75 to 1 volt lost at the
isolator. Now my voltage at the dash is over 13v where before it would
max out at less than 12v.

I wish Tige would use your products on all of their boats.

Thanks for an amazing product!
Jason T. Burns
Service Manager/Lead Tech @

Thursday, May 3, 2007

MasterCraft X-80, High Power Audio Install

There are five Digital Reference Zapco amplifiers. There is a DC1000.4 on the rear speakers and half of a DC1000.4 running the front speakers. The other half of the DC1000.4 is bridged to one of the three tower speakers while there is another DC1000.4 bridged to the other two tower speakers. On the two 12's there is a DC1100.1 on each. Every speaker in the boat runs at 4ohm to help with heat and power consumption. The interior components are getting 150 watts each, the towers are bridged at 500 watts each and the subs are getting 820 watts each. The amps are layed out one on top of the other with lit plexi in-between. the component crossovers are at the top of the rack. The tower... there are 2 PRO 80's and 1 PRO 485 painted red. The bar that holds the speakers was machined out of aluminum and anodized clear(for corrsion). Two X's were milled in the bottom to match the boat. The mounts on the bar were made for the newer X-80 towers with the speaker mounts, but. The boat came with a 95amp alternator for each motor. The customer's request was for the longest possible playing time with the motors not running. So we installed 4 Stinger SPV70 batteries (I ran out of 3 hour blue tops). Three of the batteries are for the system and one is for the boat. The hang up with using such a big battery system is that when they run below 10 volts, they require alot of current to charge back up. After going back and forth with Wrangler Northwest, we came up with a solution. The two factory alternators were replaced with a 160amp Balmar unit. In order to insure that there would be no charging issues, we would have to get the most current to the batteries as possible. The two charging systems were combined with "POWER-GATE" Isolators for 320 amps of charging current. Basically, they are like big smart diodes. The system works perfectly. All of the charging/ground cables were upgraded to 0awg. Custom battery trays were machined for each side of the boat.

Monday, February 12, 2007

Manufacturing Test System

Pyro Test designs turnkey test systems for manufacturing. In this case, our end application called for us to create a manufacturing test system that would produce, upon demand, any current from 200 mA to 350 Amps (and that was the easy part). The hard part was finding a way to switch-on the current, cleanly, with a very fast slew rate (i.e. go from 0 to 350 amps in less than 500 us) while still providing a switch resistance at least 100 times less than the nominal E/I (in our application, we could not afford to drop any significant amount of voltage across the switch). The POWER-GATE was the only switch solution which would work for our application. We contacted the folks at Perfect Switch and worked directly with one of the design engineers in order to verify that the POWER-GATE would indeed work for our intended application.Our final test set solution included several non-inductive load trays switched by the POWER-GATE product (see photo). The completed system has been up and running without a problem since we installed it on the factory floor. The end-client (a very large and well known company) was exceptionally pleased with the test system. I'm happy to report that, because of our outstanding success with this first product, we have been awarded a second purchase order from our client.

Thursday, February 8, 2007

Bell Fleet Application

We use an Onan 5.5 KW generator. The Trojan 4D AGM battery powers the generator set and runs some of the vehicle's off road lighting. The battery is charged by the Ford's 130 Amp alternator and the POWER-GATE isolates the vehicle batteries and the 4D. The setup works great.

I had a meeting with our Fleet managers in Ontario and they are sold on the POWER-GATE technology. It has been decided that Bell vehicles will integrate the P-GATE into the Isolator replacement program. I will advise purchasing that we will enter the switch into the parts replacement catalogue and we will advise our main parts supplier that we want to stock this switch to replace all standard isolators when required.


Brian Munslow
Manager - Fleet Solutions


I have (truck) 14672 all working now so come and take a look and see if I overlooked anything. The output on this new alternator is impressive and so is the POWER-GATE.

Later John--

John Cooney
Bell Canada Fleet Solutions
Mobile Power Equipment
83 Signet Dr.
North York M9L 1T6