Renewables: "talking 'bout my generation"

EVandPV

Slightly better today, 3.85 O's. 

legoman62

Forecast rain didn't arrive til 21.00👏👏 Hawaii + 0.175 O's today😂

QrizB

Wow @legoman62 you lucked out with that! The weather was less cooperative here but I've reached double kWh figures for the frst time in what seems an age (in truth, since 26th June).

10.21kWh, 3.75 O's.

Coastalwatch

4.75 O's here today.

Martyn1981

July has been a mixed bag so far, and I thought we'd be down, but actually just holding level with a 100% projection, so I guess the sun/showers haven't been as bad as they've seemed.

Spies

How accurate is solcast? I've added my imaginary array across 2 roofs and averaged the azimuth as suggested, im using that data to replicate real generation against my house load.

Do you think that would work out to be very accurate?

QrizB

Do you mean this site?

https://solcast.com/rooftop-solar/free-pv-system-performance-estimation-tool/

Putting my array in, it seems to make a reasonable guess most of the time ...

• Weds 30: estimate 9.06 actual 8.69 diff -4%
• Thurs 01: estimate 8.83 actual 8.81 diff 0% (!)
• Fri 02: estimate 9.84 actual 9.67 diff -2%
• Sat 03: estimate 7.47 actual 6.93 diff -7%
• Sun 04: estimate 9.44 actual 10.21 diff +8%

Personally if I had two arrays I'd model them independently then add up the totals, rather than trying to average the azimuth. 2kW facing E plus 2kW facing W will give quite different results when compared to 4kW facing S (or 4kW facing N, for that matter).

Spies

QrizB said:

Do you mean this site?

https://solcast.com/rooftop-solar/free-pv-system-performance-estimation-tool/

Putting my array in, it seems to make a reasonable guess most of the time ...

• Weds 30: estimate 9.06 actual 8.69 diff -4%
• Thurs 01: estimate 8.83 actual 8.81 diff 0% (!)
• Fri 02: estimate 9.84 actual 9.67 diff -2%
• Sat 03: estimate 7.47 actual 6.93 diff -7%
• Sun 04: estimate 9.44 actual 10.21 diff +8%

Personally if I had two arrays I'd model them independently then add up the totals, rather than trying to average the azimuth. 2kW facing E plus 2kW facing W will give quite different results when compared to 4kW facing S (or 4kW facing N, for that matter).

I've taken your advice and done this, I feel like I will get lower peak, but PV for longer. Will see what it looks like tomorrow.

I think a 4kwp system would be perfectly fine for my use!

EVandPV

Bit of a washout here today, 1.85 O's. 

legoman62

Missed the rain again. 4.35 O's here today👏👏