S
SRE
We're in the sunny North 
now I know we don't get as much sun as our cousins in the South BUT I have a bit of an issue with my PVSOL which I agonised over spending the cash on for weeks if not months.
Here is my conundrum - I have a ESE facing 3.96kwp Sharp 180 array installed. PVGIS reckoned that between November and the end of March it should generate 550kwh, PVSOL suggested it should generate 450kwh - it's actually generated a very healthy 650kwh. Now my problem is this - obviously taking this years figures isn't very good practice, I should be looking at a few years but on the face of it PVSOL is vastly underestimating how much sun we're getting up here.
Is anyone else having a similar problem? If you look at annual figures for the same system they are as follows:
PVGIS - 2900
SAP 2005 - 2807
SAP 2009 -2892
PVSOL - 2486
The guys at PVSOL have been really helpful but I wondered if anyone else was getting such discrepancies. Imagine trying to sell a pv system underquoting yied by over 40%!!
now I know we don't get as much sun as our cousins in the South BUT I have a bit of an issue with my PVSOL which I agonised over spending the cash on for weeks if not months.Here is my conundrum - I have a ESE facing 3.96kwp Sharp 180 array installed. PVGIS reckoned that between November and the end of March it should generate 550kwh, PVSOL suggested it should generate 450kwh - it's actually generated a very healthy 650kwh. Now my problem is this - obviously taking this years figures isn't very good practice, I should be looking at a few years but on the face of it PVSOL is vastly underestimating how much sun we're getting up here.
Is anyone else having a similar problem? If you look at annual figures for the same system they are as follows:
PVGIS - 2900
SAP 2005 - 2807
SAP 2009 -2892
PVSOL - 2486
The guys at PVSOL have been really helpful but I wondered if anyone else was getting such discrepancies. Imagine trying to sell a pv system underquoting yied by over 40%!!
