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Old 05-08-2022, 07:54   #1
Marine Service Provider

Join Date: Feb 2015
Location: Rock Hall, Md
Boat: Bristol 41.1
Posts: 1
New Xantrex inverter/charger wont charge batteries

Sure could use some help…
I’ve got a new Xantrex XCPro Marine 3000. It is supposed to be charging 2- 300 ah Ampere Time Lifepo4 batteries in parallel. The Xantrex works great, does everything it is supposed to do, except charge the batteries.

I have been working on this for almost a month… I have gotten a new inverter/charger from Xantrex.. bench tested, and works great.. on the bench. When installed in my boat, it also bypasses charging the batteries.

I assumed it was the batteries, except the Xantrex does the same thing with my AGM starting batteries…

The Life4Po batteries, which have A BMS in each, do accept a charge from both a separate charger and the alternator. The settings are all correct, as confirmed by both Ampere Time and Xantrex.

So, looking at the entire system, the only thing I could find that was not up to specs was the AC wiring. It is supposed to be 6awg, but it is 10awg. I will upgrade that, but I wouldn’t think that is enough to cause the problem I am having.

Does anyone have any possible solutions? Thank you very much.
dave43 is offline   Reply With Quote
Old 06-08-2022, 23:25   #2
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Join Date: Jun 2013
Location: canada
Posts: 4,322
Re: New Xantrex inverter/charger wont charge batteries

10awg is normal. Have a 30a breaker feeding it. What is measured voltage and freq at the inverter input connection?
smac999 is offline   Reply With Quote
Old 07-08-2022, 06:44   #3
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Join Date: Sep 2008
Location: Chesapeake Bay
Boat: Hunnter Legend 37.5
Posts: 964
Re: New Xantrex inverter/charger wont charge batteries

Is there something else providing voltage to the batteries so the xantrex is not "feeling" the need to charge? The pro marine should have a transfer switch built in, but have you set the parameters in the xantrex for life PO4?
bensolomon is offline   Reply With Quote
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