UPS Battery in RV application question

I just picked up some used UPS batteries and would like some input on whether I could use them in my RV? I now have 2 6volt 80 amp hr. batteries in series. I would wire 2 of these in parallel. 


  • mcgivormcgivor Solar Expert Posts: 3,815 ✭✭✭✭✭✭
    Assuming the existing batteries are deep cycle, and or are different from the newly aquireed standby batteries, it probably wouldn't be a good idea to connect in parallel and expect positive results..... in the long term. There may be, or probably are, different charging profiles, which will adversity effect one string or the other, or both. 

    Even with identical batteries in parallel, there are challenging circumstances where one battery, or cell within a battery becomes lower in state of charge thus rendering the whole bank useless, adding further potential problems is a recipe for disaster, in my opinion, others may have different views.
    1500W, 6× Schutten 250W Poly panels , Schneider MPPT 60 150 CC, Schneider SW 2524 inverter, 400Ah LFP 24V nominal battery with Battery Bodyguard BMS 
    Second system 1890W  3 × 300W No name brand poly, 3×330 Sunsolar Poly panels, Morningstar TS 60 PWM controller, no name 2000W inverter 400Ah LFP 24V nominal battery with Daly BMS, used for water pumping and day time air conditioning.  
    5Kw Yanmar clone single cylinder air cooled diesel generator for rare emergency charging and welding.
  • mike95490mike95490 Solar Expert Posts: 9,274 ✭✭✭✭✭
    UPS batteries are designed for only a dozen or so, deep cycles, So expect to be disapointed
    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: ,

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