Solar panel production figures

rain stopped but full on cloud. panels after a nice clean are doing what they need to do however, 700wh ish coming in, and the battery has fully charged and i have now matched my import for the day. a couple more kwh exported to cover the SC and that is then profit for the electricity for the rest of the day (I doubt my gas will be covered to day however)
 
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24 in the end, was cloudy until about 3pm then clear after that, looks an on and off day over the next few, need an average of 28 per day over the next few to break the 1mWh for the month.
 
SoliD said:
24 in the end, was cloudy until about 3pm then clear after that, looks an on and off day over the next few, need an average of 28 per day over the next few to break the 1mWh for the month.
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my hope of 600kwhs for June have badly fallen away over the past few days......i would need max production of 24 kwhs for the last 10days of june to reach it now. :(
 
hmmmm had very strange shinanegans with my system.

last night my battery did not charge in my cheap flux period. no idea why, no error was reported and my schedule is still the same as it ever was.

system reporting all ok, and the battery charged via solar as should be expected.

means that for now today so far at 15 kwh generated
4kwh battery charging
8kwh so far exported.

I am hoping it was something to do with solis doing some routine maintanence and perhaps my scheduler was offline for some reason (also it didnt swap to the grid either at the cheap point, i ran off battery all night). I will keep eye on it tonight and contact greenscape energy - the installers - tomorrow if it does it again.

glad it happened now and not winter as in winter i would not have the solar to top the battery up. i am only a penny or 2 per kwh down.
 
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Flicking between 1kwh and 6kwh constantly today it seems! Batteries close to full charge now at least. First in a few days as have been chucking some at the car.
 
This is not scientific but just a visual of whats happening……last week during my perfect day of sunshine and solar. At 5:10pm we was pulling 950watts from the sun….zero cloud all day 25+ degrees

Today on whats been a cool and cloudy day….the sun has popped out and we are pulling 1.6kws at the same 5.10pm. Goes to show what the reduction is when the panels have been hot all day in the sun. Highest temp around 20 degrees
 
Welshman said:
This is not scientific but just a visual of whats happening……last week during my perfect day of sunshine and solar. At 5:10pm we was pulling 950watts from the sun….zero cloud all day 25+ degrees

Today on whats been a cool and cloudy day….the sun has popped out and we are pulling 1.6kws at the same 5.10pm. Goes to show what the reduction is when the panels have been hot all day in the sun. Highest temp around 20 degrees
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Indeed see the same myself

I wonder if the inverter itself also becomes less efficient when its running hot after working hard for some time
Would make sense that that is also impacted
 
Mercenary Keyboard Warrior said:
Indeed see the same myself

I wonder if the inverter itself also becomes less efficient when its running hot after working hard for some time
Would make sense that that is also impacted
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I cant get at my inverter to try and cool….well not easy anyway, its in the attic but ive not floored it yet, so its a pita to get across the beams to get too it.

But 700watt drop off is pretty big for hot panels and inverter
 
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So do we think its a panel issue….hot panels causing the inverter to derate itself so it doesnt over heat, therefore it keeps producing but at a lower rate???

i mean even at midday when the sun is at its highest, with clean panels, im still only getting 2.9kws from a 3.28kw system. Thats a 10% drop off, but my inverter can be over panelled up to 5kw on a 3.6kw inverter, im well below that with 3.28, so wouldnt think its a panel issue.

but i have two temps on my inverter data, one is saying 44.6deg, the other is saying 47.3degs…even now at 7pm on whats been a pretty cool and cloudy day.
 
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Welshman said:
So do we think its a panel issue….hot panels causing the inverter to derate itself so it doesnt over heat, therefore it keeps producing but at a lower rate???

i mean even at midday when the sun is at its highest, with clean panels, im still only getting 2.9kws from a 3.28kw system. Thats a 10% drop off, but my inverter can be over panelled up to 5kw on a 3.6kw inverter, im well below that with 3.28, so wouldnt think its a panel issue.

but i have two temps on my inverter data, one is saying 44.6deg, the other is saying 47.3degs…even now at 7pm on whats been a pretty cool and cloudy day.
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Panels do directly lose efficiency with heat. Just about everything to do with electrics does.
On my panels you can lookup the efficiency impact its listed as per 10C from I believe (iirc) 35 degrees.
35 sounds a lot, but they say that solar panels typically run around 20c warmer than ambient when in direct sun.

IIRC mine are listed as around 1.5%, so each 10 degrees warmer of colder results in approx 1.5% higher or lower efficiency respectively.

I haven't seen anything specific on inverters but I don't see why some efficiency loss when hot would not happen.
 
Mercenary Keyboard Warrior said:
Panels do directly lose efficiency with heat. Just about everything to do with electrics does.
On my panels you can lookup the efficiency impact its listed as per 10C from I believe (iirc) 35 degrees.
35 sounds a lot, but they say that solar panels typically run around 20c warmer than ambient when in direct sun.

IIRC mine are listed as around 1.5%, so each 10 degrees warmer of colder results in approx 1.5% higher or lower efficiency respectively.

I haven't seen anything specific on inverters but I don't see why some efficiency loss when hot would not happen.
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Im going to look at putting a fan up there blowing around the heat sink and see if it helps. Cant hurt for the cost of a usb fan
 
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