Testimonials

 5 July 2024

I’m writing from Maine while on the boat.  As you know, I was in touch over the winter while I was planning a charging system upgrade on my Morgan 323 with a Yanmar 3GMD.  I ended up getting a package from you including the ZM6 voltage regulator and BOSCH 120-amp alternator.   This looked like a very cost-effective option for me, even with shipping.  I thought I’d write and let you know how it went.  

With my original alternator I rarely saw 20 amps going into the bank.  

I started the engine and we immediately saw 50 amps at idle.  1500rpm gave me 80 amps, which is the most I’ve seen so far given that my batteries haven’t been drawn down that far recently.  I’ve had no slippage at all with the belt so far. 

In summary, we’re thrilled with the parts you supplied and the performance of the system.  We tested it for a couple days, and are now off on another adventure of coastal cruising

I have dozens of emails from you after the sale, showing pictures of assembly, wiring diagrams, hints and tips from your experience of helping others, etc.  While not an afternoon project, it was well worth it and we are very satisfied.  

Thanks so much -Gerry 

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September 5, 2022

I’ve been pretty unhappy with our  Balmar 100 amp alternator for quite a while and especially since we put in our lithium batteries. At best, we get about 60 amps from this alternator once it’s hot. Well, it failed completely in New Caledonia and I put my original, 60 amp Hitachi alternator back on the engine. Once it was hot, I got a continuous 50 amps from it, and it stayed relatively cool compared to the Balmar. This is all on a Yanmar engine

I ordered a marinized Bosch alternator (and new regulator) from Graeme at SmartRegulator in New Zealand. It’s installed now and wow, what a difference. 

I made the alternator adapter bracket, designing it in the Fusion 360 CAD program, 3D printing a test-fit part in plastic and then having it CNC machined in aluminium in Gladstone. I gave the design to Graeme and he’s going to be selling the brackets soon.

Graeme did a great job marinizing the alternator, painting all the parts vulnerable to the marine environment. The alternator is now mounted rock-solid and putting out a ton of power.

We’re getting better than 100 amps continuously from this new marvel. Its temperature is leveling off at about 88C which is really great. I thought I’d have to install better ventilation for the alternator, but it’s fine without it due to its increased efficiency and big, external cooling fan.

I was also worried that I’d have to go to a serpentine belt system to drive this load but the 1/2″ Gator v-belt is driving it just fine with no dusting visible yet and no signs of slipping.

Another major advantage of this change is the price and availability. The alternator from Smart Regulator is about $330 USD. It’s a standard alternator (though marinized by Graeme) that can be purchased in about any auto parts store. It’s used on Ford trucks among other cars. The Balmar alternator it replaced is over $1000 USD and from what I understand, Balmar isn’t selling service parts and instead insisting that it be returned to them for service.

If you’re making this change, keep in mind that some alternators (like the Balmar) are positive switching and some or negative switching like this Bosch. Make sure your regulator will work with your new alternator. It might be necessary to have your new alternator converted, but that’s easy and inexpensive at almost any automotive electrical shop.

-Rich

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I’m running a 160amp alternator charging 8 house batteries on my commercial trip boat. These run inverters to power electrical appliances in the bar and a vacuum cleaner, etc. The ZM4 allows me to give the peak amount of power to the batteries without overloading the inverters. The ZM4 was a simple solution because it works so well, saving me time, money and stress. Great customer support, quick delivery and always available for questions.

 Peter K

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 Having an electronic background and fitting out my own launch I knew I needed a smart charger to get the best from my batteries, after searching the net and being put off by very high prices I found the ZM4.It was the single most pleasurable process during the fit out, The ZM4 works superbly and easy to install, my house batteries were old and running at only 60% and 5 years old, I still get good usage saving the cost of replacements for a bit longer. The ZM4 is designed on very sound battery charging principals and delivers even at very low RPM. Graeme was fantastic, very helpful and even popped in for a personal visit when he was in my town, he went out of his way to offer advice and share his experience, and he supplied me with an alternator with the correct pulley size in addition to tips on making up a better pulley tension system.I highly recommend the ZM4 for any boat or camper van.Delivery was excellent and service superb.Thanks for a great product

Marcus K

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I wish to say that the ZM4 was all you said and more. It was easily installed (with help from a couple of phone calls) and works a treat. Even after a couple of months when I wanted to add a tacho to the system Graeme did not hesitate to help in  simple layman terms so that I actually understood what I was doing. Sent me the part I needed without hesitation. I feel that I got good value at the price I paid and exceptional service.

 John D

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I have fitted the ZM4 smart controller and am looking forward to reducing our engine hours to charge our batteries. The support and advice I received was outstanding, including a professional conversion of the alternator. The ZM4 is very affordable and the build standard is high. The instruction manual was informative and very easy to follow.

Neil A

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I have found the ZM4 to be a great product; adjustment is simple when checking the charge rate using a digital meter. I believe mine was one of the earlier model and still under some development, Graeme recalled it and brought it up to date at no cost to myself. It has performed perfectly and I believe it represents great value for money.

Alan S

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ZM4 works great, it’s so nice to always have full batteries. Your service is A1 and value for money. - Brian J

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A fantastic product that does what it is supposed to do - straight out of the box.Easy to install and set up with very clear instructions.Excellent value for money.Product support is second to none. This company truly wants to help you get the best out of their product.I like knowing that my batteries are being looked after and charged in a way that not only charged, but charged quickly and in a way that prolongs their life.  - John P

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The ZM4 provides an effective alternative to the big brand smart regulators and at a very affordable price. Easy to install and after 2 years, has proven totally reliable. The support provided has been outstanding.Highly recommended. Steve M

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My yacht was fitted with a stock standard Bosch 85 amp alternator and although it coped well with normal loads such as engine starts and light standing loads it struggled to high demand loads.I could never get maximum amperage from my alternator and charging the batteries took a long time whilst motoring. Replacing the alternator was not going to fix this and the only alternative was a smart regulator. The ZM4 fit the bill perfectly. It’s a very cost effective unit and gives the user the option to make minor voltage adjustments to suit their needs. Replacing the standard regulator with a ZM4 was easy and the instructions were very descriptive and well-illustrated. System performance improvement was immediacy noticeable.  Later on I made a request to change the system reaction time to suit my specific needs. This was done and returned within a week.The system has been running faultless for 2 years, basically install it and forget it. 

Andre W

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The ZM4, coupled with the 90 amp alternator purchased together as a package from Graeme Polley, now provides ample 12 volt power for my launch. Previous to this, I struggled continuously with undercharged batteries and poor anchor winch performance,The ZM4 was very simple to install, just follow the provided instructions,. And it has performed flawlessly now, for nine months and a hundred engine hours.. All the other 12 volt regulators that I found when researching this upgrade for the launch, appeared to do much the same job but were selling for many times the price of the ZM4. And the price of other alternators offered, again all seemed hugely more expensive than Graeme Polley’s product. This combination certainly was ‘Value for Money’. I could not believe the patience and depth of knowledge displayed by Graeme Polley. Graeme far exceeded my expectations when it came to answering all my questions, promptly returning my emails, and providing ‘expert’ knowledge as to how I might upgrade my launch.  Customer Service rating....

Exceptional!! – Graeme A

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About 18 months ago I purchased a ZM4 smart regulator. All I can say now is that I am delighted I did and am definitely satisfied I got value for money. The ZM4 smart regulator does what it was advertised to do, “ensure batteries are being charged when the engine is running”. So no more wasting fuel running the engine trying to perk up the batteries with out result.An other important aspect of this purchase I found was that the supplier, Graeme Polley, was as good as his word with regard to follow-up support. I am no expert when it comes to these matters and found Graeme ready and willing  to help with advice when needed to ensure customer satisfaction.-A thankful sailor

Rudi B.

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Thanks Graeme, that ZM4 you designed works a treat, we will definitely be fitting more of them, they are perfect for charging leisure batteries to the right voltage, because the voltage is adjustable, the price and service was pretty good too, the only criticism in my view is that the voltage control needs to have finer adjustment, with my fat fingers it can be a little tricky 

Harry,Vantage RV Ltd

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I’ve been mulling over our charging dilemma for a few years. We have a 28 foot yacht, 14hp Diesel engine. We installed a 12v fridge about 5 years ago (sucks about 1 - 1.5 amps/hour), I had a hunt around & found the ZM4 to be very well priced.After Graeme tested, overhauled & modified my existing alternator I couldn’t believe it was the same unit. It arrived back looking brand new again. The ZM4 was quite simple to install. When I did need Graeme’s input he was always happy to help out.So with the ZM4 we’re putting back in around 1 amp every 2 minutes, 30 amps per hour.In summary, the ZM4 is a fantastic product that has completely solved our charging issues. Installation is not at all difficult and the small outlay involved won’t stretch the bank. Graeme is very down to earth, & he doesn’t “talk down” to you –

John H

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The ZM4 is a great product , we fitted it to a 120 amp  alternator in our campervan which is fully mains & inverter electrified,  with gas  only for emergency.Great value and thanks for the terrific service.

Dereck & Mary S

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I have had a ZM4 fitted to my yacht since 2007,serial number 021, and never had a problem,

Great unit - Leith M

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I am very pleased with the ZM4 regulator I have now run it on two separate occasions and it is performing brilliantly and it complements the solar and wind generator nicely. The ability to regulate the voltage on bulk charge is a very nice option so one can optimise the charging. Thank you for all your help as it has been very worthwhile.

Simon – Trinidad

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11.2m Powercat. Twin engines, triple battery banks, triple alternators. Complex, inefficient and unreliable.Embracing Graeme’s experience, service, passion and commitment to quality we refurbished and reconfigured the charging system to twin alternators, twin ZM4’s and twin VSR’s to simultaneously charge the start battery banks in parallel with the large house bank. End result? Simplicity, capacity and reliability. 

Graeme’s personalised service goes well beyond just the supply of a smart, cost effective regulator and alternator refurbishment service.  I recommend you talk to him first about achieving the maximum efficiency of your charging system from alternator output (idle RPM, pulley size, rating) to battery bank capacity (amp hours, charge voltage, charge time). I thoroughly recommend his service.

Leigh J (Auckland) – Dec 2014   

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The ZM4 is an excellent piece of kit, it has massively cut down my charging time and unlike the smart charger on my last yacht, this one does not cook your batteries! Further Graeme is a great guy to deal with, he also matched a hastily purchased alternator to the ZM4 and then made some significant improvements to the alternator.  Very few marine electricians would have his understanding of charging systems

Gordon Dyer Waiheke Is - March 2015

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The best thing I have ever fitted to my keeler and at a very affordable price. Along with Graeme's invaluable advice it resolved many electrical gremlins and has given me the confidence in the electrical system to venture away for weeks at a time. I would also recommend fitting a monitoring device showing battery SOC (% state of charge) and charging amps - you'll be surprised at how little engine running time is required to fully charge the batteries and how well the ZM4 works. Greg - "Loose Cannon"  

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I am very very impressed with the finish  of the alternators and to the standard of workmanship shown. Many thanks Ross N 2015

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Once again thanks for all your help, it’s the best customer service I have ever come across.Allan W - Australia - Feb 2016

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Graeme,Another very happy customer here.  The replacement alternator dropped into place as hoped for, the ZM4 control unit is functioning well and after two weekends of use all is great.  Thank you for your guidance and suggestions for the install.  -Rob P March 2016