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Old 07-29-2021, 01:49 PM   #1
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Location: St Augustine, FL
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Battery Converter sizing

I'm upgrading my batteries from lead-acid to lithium and I need a new converter. If I have (2) 200AH 12v batteries that are each limiter to 50A of charge what size converter do I need?
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Old 07-29-2021, 05:55 PM   #2
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Originally Posted by dhealey View Post
I'm upgrading my batteries from lead-acid to lithium and I need a new converter. If I have (2) 200AH 12v batteries that are each limiter to 50A of charge what size converter do I need?
I assume when you say limiter? you mean limited? That is the highest rated charge rate? Probably controlled by the BMS in the battery. In theory you could use any charger rated up to, or can be regulated to 100 amps. But you could also use a smaller one. Just takes longer to charge. Seems as you go up in amps the cost multiplies, A 100 amp charger does not cost twice what a 50 amp charger does. It's like 4 times.

If I were doing it, I would be looking at something in the 55-65 amp range. Unless you spend a lot of time boondocking and run them all the way down, and need to charge them quickly that would do it.

Voltage is actually more important than amps, because it takes higher voltage to get a lithium to full charge than a lead acid. So make sure you get one that is programable to whatever your batteries say is the proper charging voltage.
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Old 07-29-2021, 07:40 PM   #3
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Consider your existing wiring. In my first conversion to lithium I had a 60 amp converter but could load my battery at only 20 amps. It may have been due to the long, small wires from the converter to the battery.
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Old 07-30-2021, 11:30 AM   #4
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All good advice above!

If you are charging using shore power over night, 50 amps would be adequate. If you are charging using a generator and want to minimize run time on the generator, then 100 amps or a little more would work much better.

As noted above proper installation including careful consideration for cable size and length is important. Bigger cable size and shorter distance between charger and batteries are good.

I wish you good luck and happy trails ahead!
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battery, converter

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