Solar panel production figures

From what little information I could find earlier I think they are using very similar prismatic cells to what I am, certainly the system voltage is the same, so quite possible that the cycles will be similar, I would say 15 is closer than 20, but that also depends on what percentage capacity remaining they are working to, 70% or 80%, and in the document I found earlier it was 70%, whereas my cells are 6000 cycles and 80% remaining, so 70% would obviously be more cycles.

Another interesting thing I found is they say 100% DOD for 9.5 gen battery, but they are not using the full voltage range, it is down to a cell voltage of 2.81v and upto 3.62v. LifoPo4 has a cell voltage of 2.5 to 3.65v*, but there's very little power below 3v and above 3.5v as the voltage drops /climbs very rapidly. They are using a wider voltage than most people do though. So the battery actually has more capacity than 9.5kWh. Obviously this better than the way other manufacturers spec it.

Although I have 29kWh of storage, I also don't use the full voltage range, so won't get the full 29kWh.

*these extremes of voltages might be why they have SOC issues, invidual cell voltages drop and climb very quickly at these extremes, and the BMS may well kick in to stop it dropping too low or climbing too high.
 
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I'm doing some work on my system today in the garage, I need to turn off my main inverter, so turned off my overnight charge, I woke at 6:30 with the battery at 13% (forced export left it at 45% at 7pm last night) and it was already charging. My solar charge controllers are separate from the inverter, so I can still charge the batteries, I just need to work safely.

Best I go and get on.
 
Dirty panels :mad:

Dirty-Panels.jpg
 
@Conanius Better off discussed in this thread.

Solar panels and battery - any real world reccomendations?

A lot of installers just won't do a G99 unless asked it seems. Some won't even do it then! Its ridiculous, its not hard, I applied for my own. If someone did these regularly it would probably take 20 minutes to half an hour to fill out the forms if that, which can even be done online these...
forums.overclockers.co.uk forums.overclockers.co.uk
 
Bit of mixed bag today, one minute we'd be generating 7.6kW, few minutes later down to 1.2kW, it was like that most the day, but in the end we generated 37.15 and exported 32.1.

We actually broke through the 1MWh today, ending on 1007 kWh so far for the month.
 
What a dreadful day, and a terrible month.

Generated 16.5 and exported 12.67 kWh today.

Total for the month is 1047 kWh, last year was 1325 kWh.

For the SolarEdge system it is the worst May since my system was installed in late 2015.

This May it generated 516.723 kWh, next worse was 2017 at 539 kWh, best was 2020 at 712 but that was an exceptional May, so second best was last year at 634.27 kWh

As for export, we exported 920 kWh in May, which we get paid between 15p and 26p per kWh, so hopefully about £200
We imported 662.74 kWh, the bulk of that is at 15p, which is about £100
 
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