Sizing MPPT Controller??

ftm1776
ftm1776 Registered Users Posts: 3
in General Solar Power Topics #1
I want to add a couple of panels to my system.

Total watts: 540

Voltage: 24 volts

Nominal current: 22.5 amps

Can I get some comments on using a 20 amp MPPT controller, assuming 85% efficiency to the power bus?? So usable current would be about 19.15 amps
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  • westbranch
    westbranch Solar Expert Posts: 5,183 ✭✭✭✭
    #2
    Re: Sizing MPPT Controller??

    Every brand and model is a bit different. gives us a brand and model and look at the specs for the 20 A and 30Amp models too,
    30 amp makes to look at are: MidNite Kid and Rogue
    Morning star for the 20 amps
     
    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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  • BB.
    BB. Super Moderators, Administrators Posts: 33,613 admin
    #3
    Re: Sizing MPPT Controller??

    Vmp-array? Vbatt=24 VDC?

    -Bill
    Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
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