Having a correctly installed Dc-to-Dc charging system in either your caravan or vehicle will guarantee the charging system is kept under a managed limit.

As lithium becomes more and more popular among the 4wd and caravan industry, people are realising the added benefits of light weight, more energy dense lithium battery systems. Keeping these cells and BMS happy with regulated charge will ensure the life expectancy is achieved. No BMS disconnects and 100% state of charge is reached. A key feature to note here is alternator loading. Most modern factory fitted alternators produce their best power at 1500-2000 rpm. This is cruising RPM for most vehicles. The cooling of the alternator is done by an internal fan so as it heats up under load (i.e., a big lithium battery running from it with no regulator/ Dc charger) the stress can derate the output and failure is imminent. I have seen this on many occasions and now even more so with the onset of lithium. Running a controlled charge rate based on both your alternators output and the systems battery bank will keep things running cool, efficient and you won’t have a failed alternator or flat starter battery.

Bigger is not always better here.

An example here would be two Dc-to-Dc chargers running from a factory alternator. If one is a 25amp Dc charger and the other a 50amp Dc charger the actual load input before the Dc charger is higher. Roughly 30 amps for the 25amp Dc charger and up to 60 amps on the 50amp Dc charger. That’s 90 amps right there under bulk charge conditions. And, the bigger the battery bank the longer it will take to charge so you need to design the system accordingly. 

We specialise in the field of Dc-to-Dc charging and guarantee you get the charge rates from the system we design.

Why Choose Us

  • positive review  Matt does an amazing job and thinks about what you need for the type of travel you do. Very professional with attention to detail. Cannot recommend him enough! Had him... read more

    Peta Matthews Avatar Peta Matthews
    May 26, 2021

    positive review  Thanks Matt, I highly recommend your work. We had Matt installed and set up of the grid power system to our caravan.

    George Borg Avatar George Borg
    February 23, 2021

    positive review  Not only was Matt very efficient - professional and extremely knowledgeable about the work he does, he is also 'old school' when it comes to manners - respect and friendliness.... read more

    Marcia Veale Avatar Marcia Veale
    August 17, 2018
  • positive review  Thanks Matt, very happy with the job you did with the added extra Solar and new batteries, very professional and as added bonus, the Drifter Panel works a treat! 😊 Would... read more

    Leanne Shanks Avatar Leanne Shanks
    May 28, 2019

    positive review  Best service and workmanship around.

    Andrew Delsar Avatar Andrew Delsar
    June 29, 2015

    positive review  Excellent service. Couldn’t do enough for me. Very happy customer. Would definitely recommend their services.

    Brett Loveday Avatar Brett Loveday
    July 8, 2018
  • positive review  Excellent job today by Matt..friendly, has alot of knowledge and very professional. Standard of work is second to none will definantly call for more future work. Thanks Matt!!

    Mischa Csaky Avatar Mischa Csaky
    February 11, 2015

    positive review  Great professional service , solved a problem in 5 minutes that had us stressed for a couple of months, all because the manufacturer didn’t put the correct size fuse... read more

    Janice Key Avatar Janice Key
    November 19, 2021

    positive review  Had my motor home electrics fixed waited 2 months for these guys but it was worth the wait Didn’t want anyone one else great job Riley and Mat This business knows... read more

    David Burns Avatar David Burns
    August 11, 2022
  • positive review  Such a professionally run company. Matt is so good at what he does and is a legend. Arrived on time and went above and beyond to get us all set... read more

    Shonel Shute Avatar Shonel Shute
    April 4, 2019

    positive review  Matt and Riley performed an electrical upgrade on our 25’ Jayco Optimum Motorhome. Available space was very tight, and we had concerns that what Matt had suggested would not fit, but... read more

    Michael Tscharke Avatar Michael Tscharke
    March 6, 2022

    positive review  Recently Matt and Riely installed a Monster Of grid solar system into our new Avida Esperance motorhome. After many queations asked by Matt on the requirements that we were expectng in... read more

    Domenic Centofanti Avatar Domenic Centofanti
    April 11, 2022
  • positive review  Matt resolves our diesel heater issues when the seller and fitters would not. Thanks Matt your heater has been reliable and efficient. Highly recommend Extreme

    Glenda Smith Avatar Glenda Smith
    July 17, 2019

    positive review  Matty and Riley have been exceptional. They are the best in the business and know their stuff. Thanks for pointing out Factory Faults with our van so they can... read more

    Karen N Terry Beeby Avatar Karen N Terry Beeby
    November 19, 2021

    positive review  Brilliant. Professional. Clean. Knowledgeable. Friendly. Easy to understand. And loves what he does. Mat will have all my work from now on. Keep it up mate.

    Barney Leigh Avatar Barney Leigh
    July 1, 2018
  • positive review  Matthew took the time to ring me after my initial email enquiry, talked me through my options, did a quote outlining costs and while I had a lengthy wait due... read more

    Kristin Hodge Avatar Kristin Hodge
    March 23, 2022

    positive review  Matthew was on time, informative, polite, efficient and completed great work. He installed a UHF Radio and Antenna then gave me instructions how to use. I also had a damaged... read more

    Judy McDonnell Avatar Judy McDonnell
    March 13, 2020

    positive review  Had Matt install reversing sensors and LED indicator on my Sorento SUV and must say I am very impressed with both his workmanship, professionalism and good old customer service. His... read more

    Nicholas Ng Avatar Nicholas Ng
    December 14, 2015
  • positive review  Great job on our Pajero! Workmanship is of the highest standard. Great service and a fantastic job. Thanks Matt. �

    Jackie Daniel Avatar Jackie Daniel
    November 25, 2016

    Thanks heaps guys for pimping out my Prado and Jayco Eagle outback with awesome 12 volt gear so we are ready to go on the ultimate Aussie outback adventure , Legends cheers

    Damien Hansen Avatar Damien Hansen
    August 19, 2015

    positive review  I had Charles come out last Thursday to wire up second battery with a dc dc charger. What a great job he did. Plus a great guy also. I have... read more

    David Griffin Avatar David Griffin
    June 24, 2019
  • positive review  Matthew and Riley are two very professional tradesmen who honoured their time and fulfilled our requirements exactly how Matthew said it would be done sorting the electrical system on our... read more

    Adrian Hill Avatar Adrian Hill
    August 5, 2021

    positive review  Mat and Riley installed a diesel heater in our caravan and did an excellent job. Thanks once again Mat

    Deb McGinlay Avatar Deb McGinlay
    October 18, 2021

    positive review  Matt provided excellent service in a friendly, helpful manner. His attention to detail is extraordinary and his knowledge and product is exactly what needing

    Sue Harris Avatar Sue Harris
    October 27, 2021
  • positive review  Mathew and Riley, excellent prompt service and advice as expected, excellent quality work and always patient with my questions

    Shane Ash Avatar Shane Ash
    August 5, 2021

    positive review  Sometimes you have to wait for the best....we have had a number of electrical problems over many years which cost us both time and money...while caravanning we spend the majority... read more

    Madelyn Bansemer Avatar Madelyn Bansemer
    July 29, 2021

    positive review  We didn’t mind driving up from Melbourne and waiting for over 3 months for a booking to get some of Matt’s 12volt expertise in upgrading our lithium power... read more

    Preeti Singh Avatar Preeti Singh
    July 14, 2021
  • positive review  We have been using Extreme Auto for a number of years both with our old van and our current new van. Matt and Riley are fantastic to deal with, work... read more

    Dave Chris. Jarrett Avatar Dave Chris. Jarrett
    November 2, 2021

    positive review  Matt was excellent to deal, turned up on time with more than enough solar panels and gear to handle any issues. Installed an excellent system that works well, sorted out... read more

    Drew MacKenzie Avatar Drew MacKenzie
    February 25, 2022

    positive review  Extreme Auto Caravan and Camping today upgraded our 1997 Island Star pop top to enable us to free camp with 12V power. We now have a 200... read more

    Julie Frost Avatar Julie Frost
    April 23, 2021

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