New Lifepo4 Battery mppt stays on absoption

[Mauee]

Hi,

I have a problem with my new battery I have bought. My system is a 100watts solar panel, Victron mppt 75/15 and I had 2 vehicle battery’s and that worked fine. But I needed more power, so I bought a Lifepo4 300Ah Battery. I am able to do my things with that, everything works but the mppt won’t charge. It stays always on absoption. I don’t know if I have to change anything in the mppt settings, I chose the “smart lithium (Lifepo4)” profile in the mppt. It shows always 0 watts from the solar panel.

Do anyone has an advice?

Thank you very much

[water_rat (klim8skeptic)]

Looking at your mppt history, a battery voltage of 0v would indicate a blown fuse/open breaker between the mppt and battery.

[chrigu]

Check your cabling, crimps, fuses. The battery reports 12.6V but the MPPT 14.2V, thats way too high of a voltage drop for no 0A. Also double check those voltages with a multimeter.

Further, the Victron MPPTs need a PV voltage of Vbattery+5V to start. Your PV only had 17.2V in the second screenshot, but 19.2V on the PV are necessary to start charging

[Mauee]

Thank you for the answers. The PV Voltage is that low because of the time I made that screenshot. There was not much sun anymore at 20:30 pm. I think the blown fuse/open breaker is the answer. I bought a fuse a few minutes ago and will check that tomorrow. I’ll let you know and it is really possible that this may be the fault because of my inexperience..

Thanks a lot

[Mauee]

Hi,

as promised here is the result:

I replaced it and now I have a blue bulk LED and a Solar Watts income.
And I am so much happy right now.

Thank you very much again!
I hope the rest will work well now and I hope that this case may help someone else, too.