Panels of different size?

BoFuller
BoFuller Solar Expert Posts: 187 ✭✭✭
in Off Grid Solar & Battery Systems #1
3 years ago I bought 12 Kyocera 235GX panels for my off grid cabin. It took way longer to get through County regulations than I anticipated, so I used 3 of the panels on my travel trailer for the last 3 yrs. now I'm ready to put the 12 panels on the roof of the cabin but I want to keep 3 panels on the trailer too. Can I buy 3 new 255 panels and use them as one of the four groups of 3 on my cabin roof or should I put the 255s on the trailer and make all the ones on the house the same (235)?
12 Kyocera 235 panels, 3 Gyll LiFePO4 batteries (previously 16 Trojan L16 RE-B batteries), Outback 3600W 48V system, Generac 11K propane backup generator, NW AZ, off grid, 6,000 ft (system installed in April 2015)

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  • BoFuller
    BoFuller Solar Expert Posts: 187 ✭✭✭
    #2
    New system will be the 12 panels, 16 L 16RE and an Outback 3648
    12 Kyocera 235 panels, 3 Gyll LiFePO4 batteries (previously 16 Trojan L16 RE-B batteries), Outback 3600W 48V system, Generac 11K propane backup generator, NW AZ, off grid, 6,000 ft (system installed in April 2015)

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  • westbranch
    westbranch Solar Expert Posts: 5,183 ✭✭✭✭
    #3
    I would swap out the 3 on the RV and keep the old ones together, but the 3 new ones would likely work if the Vmp is close, but you would probably lose some of their out put as the lower ones will override the new ones.
     
    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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  • inetdog
    inetdog Solar Expert Posts: 3,123 ✭✭✭✭
    #4
    The rule of thumb is that when putting different types of panels in parallel into a single MPPT input the Vmp values of they two sets of panes need to be within 5% of each other.
    For a series connection of mismatched panels the Imp values need to be within 5%.
    SMA SB 3000, old BP panels.
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  • BoFuller
    BoFuller Solar Expert Posts: 187 ✭✭✭
    #5
    Thanks all. I picked up three Kyocera 255s that I will put on the trailer tomorrow, and then put all 12 of the 235s on the house.
    12 Kyocera 235 panels, 3 Gyll LiFePO4 batteries (previously 16 Trojan L16 RE-B batteries), Outback 3600W 48V system, Generac 11K propane backup generator, NW AZ, off grid, 6,000 ft (system installed in April 2015)

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