MPPT Output reading 2.9V

Hi, I have 2 250 watt panels connected in parallel producing an average of 35 V. I've hooked them up to a 40 amp Epever MPPT and it says the output voltage is 2.9V. It says that my batteries aren't charged enough but they're LiFePO4 batteries and my multimeter test of the batteries (2 100 Amp connected in parallel) says 13.1V. 

Any advice is welcome. I'm not sure what is going wrong. I've double checked the connections and they're all good. 

cross-posted in the off-grid forum (apologies, I'm new here and didn't see this forum when I signed up)


  • mike95490mike95490 Solar Expert Posts: 9,363 ✭✭✭✭✭
    Have you followed the proper power -up sequence for the controller ?
    Connect the Controller to the battery first, and allow it time to boot up.
     after it's booted, then connect the Solar panels.

    Powerfab top of pole PV mount | Listeroid 6/1 w/st5 gen head | XW6048 inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A NiFe Battery (in series)| 15, Evergreen 205w "12V" PV array on pole | Midnight ePanel | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph ) on a timer for 3 hr noontime run - Runs off PV ||
    || Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
    || VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A

    gen: ,

  • herbnhoneyvanherbnhoneyvan Registered Users Posts: 3
    I haven't allowed it time to boot up. I'll try that. Thanks! 
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