New Xantrex inverter/charger wont charge batteries

[dave43]

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.

[smac999]

10awg is normal. Have a 30a breaker feeding it. What is measured voltage and freq at the inverter input connection?

[bensolomon]

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?