Xantrex C-40 Solar charge controller


I am trying to setup a 500W system at my home using two 300W panel connected in series. The required panel voltage to generate maximum power is close to 37V with 8.2A. Thus, the total series volatge is close to 74V and 8.2A output. I want to use such a configuration to charge a 12V battery bank and I would like to know whether Xantrex C-40 solar charge controller serves the purpose?

1) When I read the tech specs of Xantrex C-40 charge controller, it seems it could handle maximum input PV voltage of 125V but it was not clear from the manual if it is a buck type solar charge controller. So, I would like to know if I am making the right choice for the controller?

Thanks in advance for the answer.



  • westbranch
    westbranch Solar Expert Posts: 5,183 ✭✭✭✭
    Re: Xantrex C-40 Solar charge controller

    Welcome to the forum,

    the C40 is a PWM CC , to do what you propose you need a MPPT CC.

    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