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w1ldcatrig avatar image
w1ldcatrig asked

Victron mppt 100/30 not charging batteries

I recently upgraded my solar system by installing a victron LiFePO4 200 a/hr battery, a victron mppt 100/30 amp charge controller, and a BVM 712. The set up was fairly easy but I noticed my charge controller isn’t sending any amps to my battery. When Select the battery preset for # 7 on the mppt charge controller, which is recommended in the manual, designed for lithium batteries, I get zero amps of solar. But if I switch it to say a AGM battery preset or a gel victron long life I get amps and the charge controller works fine. What am I doing wrong!!!! Or is the charge controller just faulty.



Here is what happens when I switch to a different preset

I get charge going to my battery





MPPT Controllers
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1 Answer
ejrossouw avatar image
ejrossouw answered ·

@W1ldcatrig I noticed the mppt reads the battery temp as -1 degree C which is why it won't charge the Lithium. Typically Lithium should not be charged if the temp is approx 5 degrees or below. The bat temp reads 41 but it does not add up even with degree F which should be about 31. I think that is likely the issue so mppt is working as it should.

Also, I see the battery is at 99% and if the mppt is under the battery's control, it may well stop the charger. My battery won't accept more than 98%.

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w1ldcatrig avatar image w1ldcatrig commented ·

Well it wasn’t charging when the battery was at 89%, I recently drove the car which is why it is at 99%


As for the temps. I’m still confused about that. Seems like that’s quite low, I’m in Las Vegas where it is 90Deg F

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