Help with 2 x 250 watt panels

marky
marky Registered Users Posts: 4
in Solar Beginners Corner #1
Hi i have two 250watt solar panles and i am only getting 170 to 190 watts in full sun could anyone plz help
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  • BB.
    BB. Super Moderators, Administrators Posts: 33,642 admin
    #2
    Re: Help with 2 x 250 watt panels

    Assuming your battery bank is low and needs charging, the charge controller is in MPPT/maximum current mode, you are measuring current in the middle of day, etc...

    How are your panels wired? In series or in parallel?

    What is the Vmp/Imp of the panels? What is the voltage measured at the Vpanel input the the charge controller?

    -Bill
    Near San Francisco California: 3.5kWatt Grid Tied Solar power system+small backup genset
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  • Photowhit
    Photowhit Solar Expert Posts: 6,006 ✭✭✭✭✭
    #3
    Re: Help with 2 x 250 watt panels

    Also is this total for both panels?

    What stage is your charge controller in? Bulk, Absorb, Float?

    What panels do you have?

    How are you measuring the wattage produced?
    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 backup...lol), 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.
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  • westbranch
    westbranch Solar Expert Posts: 5,183 ✭✭✭✭
    #4
    Re: Help with 2 x 250 watt panels

    Have you retightened all connections as well
     
    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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  • marky
    marky Registered Users Posts: 4
    #5
    Re: Help with 2 x 250 watt panels

    Hi thank you for getting back to me we have snow at the min so i cant get on the roof to get the spec soon has the snows gone i will get back to u all


    thanks mark
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  • westbranch
    westbranch Solar Expert Posts: 5,183 ✭✭✭✭
    #6
    Re: Help with 2 x 250 watt panels

    In the mean time you can re-torque all interior connections from the disconnect to the cc and batteries:cool:
     
    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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