getting 12V out of a 24V panel?

al128
al128 Solar Expert Posts: 65 ✭✭✭✭
in Solar Beginners Corner #1
Hi there,

I have a Shell PowerMax Ultra 175-P panel with the following specs (copying the rear label here)


max power: 175w
short cir.curr: 5.43A
rated current: 4.95A
open circ. volt.: 44.6V
rated voltage: 35.4V

so this seems to be a traditional 24V (nominal) panel, right?

it has a : Junction box type: ProCharger™ IP54



more specs here: http://docs.google.com/gview?a=v&q=cache:YglMuM2RRkEJ:www.npp.ca/images/shellsq165-175.pdf+shell+powermax+ultra+175+solar+panel&hl=en&sig=AFQjCNH5A6WkKLOtB4EEr6_AuNM_KqgTUw


can I get the 175w in (nom) 12 v out of the panel or only in (nom) 24V form???


thx
al
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Comments

  • mike95490
    mike95490 Solar Expert Posts: 9,583 ✭✭✭✭✭
    #2
    Re: getting 12V out of a 24V panel?

    You can only get 175W at 35.4V

    You can use a MPPT type controller, and let it down-convert to 12V, then you would get 175W @ 14V (12.5A) remove 20% for warm panel losses.
    Powerfab top of pole PV mount | Listeroid 6/1 w/st5 gen head | XW6048 inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A NiFe Battery (in series)| 15, Evergreen 205w "12V" PV array on pole | Midnight ePanel | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph ) on a timer for 3 hr noontime run - Runs off PV ||
    || Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
    || VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A

    solar: http://tinyurl.com/LMR-Solar
    gen: http://tinyurl.com/LMR-Lister ,

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  • Windsun
    Windsun Solar Expert Posts: 1,164 ✭✭
    #3
    Re: getting 12V out of a 24V panel?

    This is about the only reliable controller that will do that http://store.solar-electric.com/mosumpsochco.html
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