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Renewables: "talking 'bout my generation"
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I've long suspected my inverter isn't telling me the truth about daily generation and now I think I have evidence: I've taken the data which produces the generation chart and obtained an estimate of the energy output by assuming that the figure stored every 5 minutes is the power output over the whole of the preceding 5 minute interval. I know this isn't true but it's the best I have come up with so far.
For example, the worst day this month was 12th May. Inverter reported an output of 4.9 kWh. My analysis using the method above gives an output of 3986.7 Wh, a difference of 913.7 Wh. In other words on this day the inverter over-reported by almost 23%. It may balance out; on other days it's under-reported and one day earlier this week when there was only 3 or 4 data points since daybreak I noticed the system was already claiming to have generated 1.7 kWh.
What I think might be happening is that the servers storing the data are based in China and when local time there reaches midnight it saves that day's data meaning that at 5pm a new day begins. I'll be testing this theory over the coming months.3 -
Last few days have been dull as dishwater, tomorrow enveloped in cloud too, what a disappointing end to the month.4.3kwp JA panels, Huawei 3.68kw Hybrid inverter, Huawei 10kw Lunar 2000 battery, Myenergi eddi, South facing array with a 15 degree roof pitch, winter shade.2
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Best May so far 625 kWh compared to last Year 489 kW also beats June 550 kWh for my 5.2kWh split east - south west solax x1 Boost 3.6 kWh inverter. Hopefully June will be better again from last years.3
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A surprising 3.36 O's on a cool dull day here to finish 3% up on pvgis for the month.
East coast, lat 51.97. 8.26kw SSE, 23° pitch + 0.59kw WSW vertical. Nissan Leaf plus Zappi charger and 2 x ASHP's. Givenergy 8.2 & 9.5 kWh batts, 2 x 3 kW ac inverters. Indra V2H . CoCharger Host, Interest in Ripple Energy & Abundance.4 -
6.8 & 4.163 O's - Finished May on 112.76% PVGIS despite a really poor start to the month.2 Separate arrays, 7 x JASolar 380w panels (2.66kWp) south facing, 4 x JASolar 380w panels (1.52kWp) east facing, 11 x Tigo optimizers & cloud, Growatt SPH5000, Growatt 6.5kWh Hybrid battery (Go-live 01/12/21) - Additional reporting via Solar Assistant.2
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Dull and even some very very light rain / drizzle for all of 10 minutes.
1.91 O's
29th of 31
3.795 kWp Solar PV System. Capital of the Wolds3 -
Miserable end to the month here on the E coast.
1.825 O’s. May total 537.4kWh or 134.35 O’s🤣16 Sanyo Hit 250s.4kWp SMA 3.8kWp inverter. SW roof. 28° pitch. Minimal shade. Nov 2011 install. Hybrid car. Ripple Kirk Hill. N.E Lincs Coast.2 -
Drizzle from when I woke until around 10am but not enough to water the garden, dull afterwards, no glimpse of the sun today 1.2 O's.
On the brighter side 641.6kWh for May, PVGIS is 595.3kWhBarnsley, South Yorkshire
Solar PV 5.25kWp SW facing (14 x 375) Lux 3.6kw hybrid inverter installed Mar 22 and 9.6kw Pylontech battery
Daikin 8kW ASHP installed Jan 25
Octopus Cosy/Fixed Outgoing2 -
My PVGIS target for the month was 548kw
My actual was 548kw
Those guys..........4.3kwp JA panels, Huawei 3.68kw Hybrid inverter, Huawei 10kw Lunar 2000 battery, Myenergi eddi, South facing array with a 15 degree roof pitch, winter shade.3 -
1465.8kwh in May
Around 124% of PVGIS for the month
Yesterday wasn't too exciting 2.1Os, Friday & Saturday looks good for solar here2
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