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  1. Mike Mas

    Compass B+ / Transit AWD / Lithium / In Depth - Mike Mas

    Hello DIY Users - After studying Transit’s new “All Wheel Drive” chassis and Thor’s B+ Compass RV for over a year now, I finally completed my In-Depth review and would like to share my findings and images with others on this forum to include a Dual Battery Lithium System I designed for RV's and...
  2. Mike Mas

    Two year old Relion 100-HP battery bank going south rapidly

    Any and all Lithium batteries need to be charged to 100% weekly or so to both calibrate the SOC meter and to balance the cells. Unless you are planning on keeping the batteries for 10-15 years, don't worry about charging to 100%. In addition, almost every RV inverter will charge to 100%...
  3. Mike Mas

    5112 Dual Voltage - Dual Inverter - RV Lithium System - Mike Mas

    Thanks for the reply - that's the same exact battery I used on my 12 volt house battery upgrade. He should have some great results, I replaced my 6 flooded batteries with the one 315 ah battery and it has tons more capacity. Seemed like my flooded batteries were always dead if I un-plugged...
  4. Mike Mas

    5112 Dual Voltage - Dual Inverter - RV Lithium System - Mike Mas

    Hello DIY Users, I just completed my latest (Independent Non-Sponcered) Lithium RV upgrade video named “5112 Dual Voltage - Dual Inverter - RV Lithium System”. The 5112 system is unique and different than any other lithium system in operation today. I designed the 5112 System for larger Class A...
  5. Mike Mas

    AMP hour rating and voltage. When is a battery dead?

    I'm using Lithionics 12 and 51 volt lithium packs. The 12 volt pack is 630 amp hours. There is a world of difference and a number of grades when it comes to lithium cells. Most of the import batteries are going to have the lowest grade cells but still work well for most applications. Mike
  6. Mike Mas

    AMP hour rating and voltage. When is a battery dead?

    If you take reasonable care of a lithium battery (providing its good when you buy it) there's no reason it won't last 10-15 years. Lithium is really an investment. Thanks Mike
  7. Mike Mas

    How to properly charge lead acid batteries from solar with a load

    Thanks for the reply - Regretfully because of the extreme high amperage of a 12 volt system, they are not the best choice for continuous high amperage since it heats the components like fuses cables etc. creating losses and voltage sag. Making matters worse a 100 ah flooded battery can only...
  8. Mike Mas

    AMP hour rating and voltage. When is a battery dead?

    Hello and thanks for the reply - I just helped a friend install a 300 ah battery in his coach and the cost which was $1,039 for the 300 ah lithium was less than it would be to replace his 6 flooded batteries. Of course the biigest advantage is you can draw lithium down to 10-15 % where a flooded...
  9. Mike Mas

    48v Battery Charger?

    I am totally impressed by the generator and its sofeware operating system. Super nice piece! thanks for sharing. Mike
  10. Mike Mas

    2 100 ah lithiums

    You can do it either way however - You might be better off charging all the batteries together to keep the batteries cell voltages the same for voltage and amperage discharging. Mike
  11. Mike Mas

    How to properly charge lead acid batteries from solar with a load

    If you're looking for solar storage, you should consider lithium, flooded and AGM are more for starting and not really designed nor have any real capacity to store much solar, unless you have many many of them. Thanks Mike
  12. Mike Mas

    AMP hour rating and voltage. When is a battery dead?

    It's impossible to extract 240 amps from a 240 amp hour battery. For the most part amp hour ratings are for smoke and mirros to confuse consumers. At best you'll only get 50-60% - any more destroys the battery chemistry. You should look into a lithium pack! Thanks Mike
  13. Mike Mas

    'no sell' hybrid roof top solar with batteries

    I looked over the kits they offer - I feel you would be better off putting your own system together. 100 ah battery is not going to store enough power to do much other than lighting. There are 300 ah lithium batteries going for under a grand. I would not start a system with lessthan that...
  14. Mike Mas

    V2 AutoGen - any experience??

    Most of the auto Gen Start protocols are pretty much the same, they work on set voltage or temperature settings and have the ability to exercise at set time levels. What brand name module did you find? Mike
  15. Mike Mas

    Great overview of LiFePO4 DIY

    Hello - You have to be careful with DIY lithium batteries. You should have a good firm understanding of lithium chemistry and the operation of battery control modules and accs. since there is always a potential of a fire. Thanks Mike
  16. Mike Mas

    Can I use 30A AC rocker switch for 30A DC ?

    Hello your second choice you posted is good for smaller devices like an RV slide or jacks, the best and safest bet is to just buy a Marine cutoff switch. They can all handle big amps, I use them on my diesel motor homes chassis battery where there is hundreds of amps to turn the engine starter...
  17. Mike Mas

    How to run AC input off generator only with 2 Growatt 5000es inverters and auto transformer…

    Hello - Not sure of your installation but 240 volts can use only three wires - there is two legs at 110 volts on each leg, and a neutral wire. Ether leg to neutral, gives you 110 volts. The volatge between the two hot legs is 240 volts. Be careful and use a voltmeter to confirm the voltages...
  18. Mike Mas

    Fuse holder nut was glowing RED!

    Hello - This is a common problem with 12 volt lithium systems running an AC unit. What happens is as the plastic body holding the lug heats up, it can loosen the connection. Once it's loose its a chain reaction where it will self-distruct. Thanks Mike
  19. Mike Mas

    24 volt battery arrived, needed 48 volt.. what to do with this one?

    Hello - Not sure of your installation - but how about the shipper selling you another 24 volt battery (at a discount) then you could just put the pair in series for 48 Volts? Mike
  20. Mike Mas

    Safe Enclosure recommendations?

    Hello - Many lithium companies are like Lithionics build their batteries in 6061 T6 aluminum case to help contain smoke or fire. If the lithium is anywhere in a home or motor home I would recommend only using batteries in meatl cases to be safe. Thanks Mike
  21. Mike Mas

    Safe Enclosure recommendations?

    Possibly the best location in a home is in the garage. The reason is they are more protected for fire which is why garages require thicker drywall, and steel door to the house. I certainly would never locate a lithium system anywhere in the interior of a home. Stay Safe - Mike
  22. Mike Mas

    LifeP04 meltdown in a Sprinter van ?

    Hello - Sorry for your loss! This just confirms that there is always a potential danger using using lithium - the entire safety of the battery is only as good as the BMS which protects it. Mike
  23. Mike Mas

    Renogy and Magnum

    Hello - do you have any other panels in the system now? Mike
  24. Mike Mas

    Inverter install with solar panel

    Hello - Most built in trailer and RV solar panels are generally for trickle charging the house battery or chassis battery and are therefore low amperage and most do not have a separate controller you could expand with. You would be better off investing in a decent controller expecially if you...
  25. Mike Mas

    cable size?? fuse size??

    Hello - It's difficult to use a generic cable and fuse size since each installation and required cable length and laods are all different. Since you're using a 48 volt system your wire will be substantially smaller than a 12 volt system since 48 volts has only 25% the current of 12 volts...
  26. Mike Mas

    Battery location

    I was also going to ask if its in an RV - if it is, most flooded batteries are located in an open compartment. If you're going to lithium it's best to relocate the installation and equipment either to a closed compartment or inside the RV for temperature reasons. Mike
  27. Mike Mas

    Battery location

    Hello - Will you be using flooded or Litium batteries in your installation?
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