One thing I've noticed is now its the dark part of the year I'm not getting as good performance from the second string. I have 12x 400w panels with 7 on one string and 5 on the other. I've noticed on the 5 string that output is considerably lower than expected compared to the 7 string. Despite a startup voltage of 75V my inverter generally doesn't like less than 4 or 5 panels and in the weaker sun the voltage is a bit marginal. I can fit a couple of extra panels horizontally underneath the existing with 250mm to spare from the bottom of the roof and this would bring both strings to 7. On paper its 17% more (4.8kW to 5.6kW) but in the real world I think it would be a bit better than that with what I'm seeing above.
I think Ill have a word with the installer and hopefully not fall off my chair when (if?) they give a quote.
1kWh here today and after yesterdays 2kWh my 20kWh store is going to be shutting itself down before 2am charge period starts. Looks like a bit of sun tomorrow followed by more cloudy weather. Roll on spring
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