Batteries in Parallel?

Hi Folks
first time on this forum.
I am in the process of designing an off - grid system for my house:
1Kw of 170W panels and about 1500 A/h batteries.
My Question is what are peoples opinions about wiring batteries in parallel?
I have always been told to avoid it as it leads to irregularities in charging but some designers' web sites seem to recommend it as a matter of course.

All opinions welcomed.



  • nigtomdaw
    nigtomdaw Solar Expert Posts: 705 ✭✭
    Re: Batteries in Parallel?

    A single bank is simple and striaght forward, so if possible designing from scratch this is the way to go.

    My bank has 3 strings and was dictated by the offer of the batteries and price.

    I have had no problems todate.

    Wiring the strings takes care and as always there is best, accepted and bad ways to combine strings . I think some one posted a link a couple of months ago to an excellent web site that showed the perfect way to wire strings with data to back up his designs.
  • mike95490
    mike95490 Solar Expert Posts: 9,583 ✭✭✭✭✭
    Re: Batteries in Parallel?

    Here's a great writeup on how to properly wire your battery bank (diagonally)
    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: ,