solar charge controller which one for my system

tom12tom12 Registered Users Posts: 7 ✭✭
I currently have 4 yingli 230w panels 37v voc, pmax is 29.5 7.80 current pmax, short circuit current 8.40. One of the panels drops to 33v-33.8v 8.10a short circuit when sun the hits it others are around 8.20a 36v voc. panels yingli YL230p-29b im in ny and its a 24v system for the battery bank. What controller should I Use. Please let me know asap thank you


  • AuricTechAuricTech Solar Expert Posts: 140 ✭✭
    Re: solar charge controller which one for my system

    While I haven't looked into specific MPPT controllers (for my planned application, PWM is just fine), people here speak highly of the various MidNite controllers. You'll want to have two parallel strings, each with two panels in serial.
  • PhotowhitPhotowhit Solar Expert Posts: 5,658 ✭✭✭✭✭
    Re: solar charge controller which one for my system

    You'll need an MPPT type controller, and you'll want to set them up in 2 strings of 2 panels, unless your going to be a long way from your charge controller.

    A Midnite Kid a 30 amp Charge Controller (CC) would be a bit under sized, but you won't loose much very often and it has a lot of attractive features, but you will not have room to expand and will actually be above the max output of the controller on cool/cold days.

    With bright sun 920 watts of panels you should expect them to produce roughly 920 x .77= 708 watts ÷ 24v = 29.5 amps.

    If you need room to expand, The Midnite Classic or Outback FM80 or even the Mornigstar MPPT 60.
    Home system 4000 watt (Evergreen) array standing, with 2 Midnite Classic Lites,  Midnite E-panel, Magnum MS4024, Prosine 1800(now backup) and Exeltech 1100(former, 660 ah 24v Forklift battery(now 10 years old). Off grid for 20 years (if I include 8 months on a bicycle).
    - Assorted other systems, pieces and to many panels in the closet to not do more projects.
  • westbranchwestbranch Solar Expert Posts: 5,183 ✭✭✭✭
    Re: solar charge controller which one for my system

    Tom can you tell us more about the 1 panel that drops its output... there is something not computing in your comment....
    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,
    Eu3/2/1000i Gens, 1680W & E-Panel/WBjr to come, CL #647 asleep
    West Chilcotin, BC, Canada
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