How to connect 2 battery banks (12v and 24v) to one array and 2 controllers (one 12v and one 24v)

papabear1129papabear1129 Registered Users Posts: 1
Hello, I am new to solar and have a hopefully basic question but cant seem to find the answer on the net.

I have one solar array 1000 watts but want to charge two different battery banks. One bank is 12 volts and one is 24 volts.

I have two Renogy MPPT controller chargers capable of 12/24 systems.

Can i connect up both controllers to the same array and have them charge 2 separate battery banks?


  • westbranchwestbranch Solar Expert Posts: 4,915 ✭✭✭✭
    No.  You will need to split that array into 2 separate arrays, one for each CC...(i.e.  one for each battery )
    KID #51B  4s 140W to 24V 900Ah C&D AGM
    CL#29032 FW 2126/ 2073/ 2133 175A E-Panel WBjr, 3 x 4s 140W to 24V 900Ah C&D AGM 
    Cotek ST1500W 24V Inverter,OmniCharge 3024,
    2 x Cisco WRT54GL i/c DD-WRT Rtr & Bridge, Hughes1100 Sat Modem
    Eu3/2/1000i Gens, 1680W & E-Panel/WBjr to come, CL #647 asleep
    West Chilcotin, BC, Canada
  • mike95490mike95490 Solar Expert Posts: 7,365 ✭✭✭✭
    No, a PV array cannot have more than one controller on it.
    You could use a marine battery switch, and when one battery bank is full, flip the switch and connect the Array to the controller on the other battery bank.
    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: ,

  • mcgivormcgivor Registered Users Posts: 1,357 ✭✭✭✭
    Agree with above replies 
      1500W, 6× Schutten 250W Poly panels , Schneider 150 60 CC, Schneider SW 2524 inverter, 8×T105 GC 24V nominal 

  • BB.BB. Super Moderators Posts: 26,978 admin
    To be clear--You cannot share one solar array with two or more MPPT charge controllers. You can share an array with two or more PWM solar charge controllers with the SAME voltage battery banks.

    Otherwise, charge the 24 volt battery bank and use a second charge controller from 24 to 12 volt charging (of course, you have to worry about how to prevent the 12 volt bank from killing the 24 volt battery bank).

    Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
  • mcgivormcgivor Registered Users Posts: 1,357 ✭✭✭✭
    Best to keep the 12v and 24v systems divorced from one another, it will most likely end up with complications.
      1500W, 6× Schutten 250W Poly panels , Schneider 150 60 CC, Schneider SW 2524 inverter, 8×T105 GC 24V nominal 

Sign In or Register to comment.