not bad. my installer was being reasonably truthful about the estimated productionHave a look here and plug in your details. It'll be more accurate than your installer prediction:
JRC Photovoltaic Geographical Information System (PVGIS) - European Commission
Photovoltaic Geographical Information System (PVGIS)re.jrc.ec.europa.eu
was quoted 3780kwh, and JRC estimating 3630kwh
march estimated 307kwh - actual 290kwh
april estimated 414kwh - actual 209 so far
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