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  • Newbie with a question!

    Hi all!

    I've currently got a 2.4kW PV system installed on my property in the UK. I'm trying to work out how many kWh/year it'll generate but am struggling with the equations I've read.

    From the SAP 2005 calculations, it states the generation = 0.75 x kW(peak) x S x Zpv

    where S is the irradiance and Zpv is the overshading factor, being 1126 and 1 respectively.

    The problem I'm having is where does the solar panel efficiency come in to the equation? My panels are rated at <16% according to the specification sheets.

    Sorry for the question, any help would be greatly appreciated.

    Thanks!

  • #2
    Originally posted by emJayOwen View Post
    From the SAP 2005 calculations, it states the generation = 0.75 x kW(peak) x S x Zpv

    The problem I'm having is where does the solar panel efficiency come in to the equation? My panels are rated at <16% according to the specification sheets.

    Thanks!
    The panel efficiency is already accounted for in the kW(peak)
    sigpic

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    • #3
      I would just use PV watts http://www.nrel.gov/rredc/pvwatts/ which uses 20 years of weather data, and you just enter your panel / array info.
      spreadsheet based voltage drop calculator:
      http://www.solar-guppy.com/download/...calculator.zip
      http://www.solarpaneltalk.com/showth...oss-calculator

      http://www.mike-burgess.org/PVinfo_2.html

      solar: http://tinyurl.com/LMR-Solar
      gen: http://tinyurl.com/LMR-Lister ,
      battery lugs http://tinyurl.com/LMR-BigLug
      Setting up batteries http://tinyurl.com/LMR-NiFe

      gear :
      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

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