Wiring Diagram Help Please

This forum has been amazing the last few months as I've planned my build. I've searched through it more times than I can count and it seems like the deeper I dig into electric the more confusing it gets - I was hoping those with a lot more experience may be willing to review my electric diagram and help me correct all the things wrong with it.

The solar input for the Kisae 1250 is maxed at 50voc, 30amp. I can't run the four in series as it would be 108v and I can't run in parallel as it would be 31.2amp. My understanding is that if I run a series-parallel configuration the combined load would be 43.2v (from connecting a pair in series) and 12.48 amps (the connecting those two pairs in parallel). That would give me 10AWG at 20 feet?

I'd really appreciate the help, thank you!


  • EstragonEstragon Registered Users Posts: 4,495 ✭✭✭✭✭
    To clarify, the amp limit on the controller is likely the output current (at ~14v) going to the battery.  The input current will be lower.  Looking up DMT1250, it appears to be 50a output. 
    In the specs...
    Kisae Technology | DMT-1250 (kisaepower.com)
    ... the input isn't clear to me, as it says 10.5-32vdc, but 35v max for parallel pv input.  Either way, if this is right, any series connection would be too high. 
    Main daytime system ~4kw panels into 2xMNClassic150 370ah 48v bank 2xOutback 3548 inverter 120v + 240v autotransformer
    Night system ~1kw panels into 1xMNClassic150 700ah 12v bank morningstar 300w inverter
  • mike95490mike95490 Solar Expert Posts: 9,361 ✭✭✭✭✭

    if possible, get a different controller that is more flexible.  50V input for a 50A controller is quite limiting, as you have found out.
    400W would get you 33 amps.  So a 30A controller would do the job.   Morningstar solar has a couple smallish controllers, and I think they are 75V input ( so you could do 2s2p inut from the 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

    solar: http://tinyurl.com/LMR-Solar
    gen: http://tinyurl.com/LMR-Lister ,

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