PV temperature compensatin value

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westbranch
westbranch Solar Expert Posts: 5,183 ✭✭✭✭
in Solar Beginners Corner #1
I have been looking at some panels for expanding my system.
I have used the Outback Array sizing tool and went looking for the TC value for the panels. Couldn't locate it.
As a default I used the values in the Array sizing Tool

I am comparing 110W panels with very similar Amps at 12 V.

I looked at the spec sheet for my other Toshiba's and they list a value of -.346% / degree C for Voc.
Can't seem to get the Tool to show me the default right now???

Q: How different can the values be for different panels?

Eric
 
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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  • RCinFLA
    RCinFLA Solar Expert Posts: 1,484 ✭✭✭✭
    #2
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    Re: PV temperature compensatin value

    I thought someone mentioned the Outback tool gives same output regardless of temp setting.

    -0.34% per deg C is a good number. NEC uses -0.35%, considered worst case, for max Voc at location's cold temp record, for calculating max voltage on charge controller.
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  • audredger
    audredger Solar Expert Posts: 272 ✭✭
    #3
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    Re: PV temperature compensatin value

    No, the Outback sizing tool does compensate for temp, both high & low.

    I just compared BP 4175; Vtoc .16, Vtmp .164 vs Sharp NT 175U1; Vtoc .51, Vtmp .158. The difference from three in series to two in series was 5 degrees F.
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  • westbranch
    westbranch Solar Expert Posts: 5,183 ✭✭✭✭
    #4
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    Re: PV temperature compensatin value

    RCin Fla, it may have been a comment I made that moving the temp selector did not make a change. Must have been the panels I was evaluating, not too big but big enough not to make any change ....

    Eric
     
    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
    · Share on Twitter

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