Renewables: "talking 'bout my generation"

JKenH

Grandad2b said:

MLeeman said:

A good 4.45 O's today. Might reach March target after all!

On sunny days in the mid to late afternoon my generation curve seems to lessen quicker than it should (not lots but .5  ish) and then later afternoon it jumps back up again. No clouds or shading seems to be causing this.

Up until lunch time is working perfect.

Anyone have a thought on this?

Here's my output for today 
No idea why there's a big hole every day, I just put it down to cloud. Funny how it's always just as the sun gets to its highest.

I had a similar problem last summer with output dropping unexpectedly on very sunny days. After a bit of investigation it turned out the inverter was tripping out when the grid voltage was in the high 250s. I live in a rural area and my house along with about a dozen others is fed from a transformer on a pole. Another one of the houses also has solar. Grid voltage here varies with load/solar generation (from 212v to 259v) and the pV generation on those sunny days were taking the voltage beyond the limits the inverter could handle causing it to trip out then a few minutes later restart as the voltage dropped. 

legoman62

Poor start to the month. 1.025 O’s here today🤷🏼‍♂️

Magnitio

Another poor day at 1.37 O's

We need more of this:

Merlin139

Poor start to April. Saw one glimpse of the sun but I think it ran away because of the rain.

1.29 O's

EcoScruples

A very disaponting March indeed, only managed 253kw (expected 380kw) so quite a bit short.
My first year comes round mid June so let's keep those clouds away.

Bill73

Grandad2b said:

Is a 20kW wind turbine very large? Not that I've any realistic prospect of having one myself but I have a mental picture of something quite big.

It's all relative of course, the tower is 20 metres high and the blades are 6 metres, so 26 metres base to tip. The generator weighs just over a tonne. Average rpm is about 70 depending on the wind. Today 2nd April it is just ticking over as there isn't much wind. Production on an average day here (North East Scotland) is between 200 and 300 kWh. That's 24 hours of course - it works fine at night 

Grandad2b

JKenH said:

Grandad2b said:

MLeeman said:

A good 4.45 O's today. Might reach March target after all!

On sunny days in the mid to late afternoon my generation curve seems to lessen quicker than it should (not lots but .5  ish) and then later afternoon it jumps back up again. No clouds or shading seems to be causing this.

Up until lunch time is working perfect.

Anyone have a thought on this?

Here's my output for today 
No idea why there's a big hole every day, I just put it down to cloud. Funny how it's always just as the sun gets to its highest.

I had a similar problem last summer with output dropping unexpectedly on very sunny days. After a bit of investigation it turned out the inverter was tripping out when the grid voltage was in the high 250s. I live in a rural area and my house along with about a dozen others is fed from a transformer on a pole. Another one of the houses also has solar. Grid voltage here varies with load/solar generation (from 212v to 259v) and the pV generation on those sunny days were taking the voltage beyond the limits the inverter could handle causing it to trip out then a few minutes later restart as the voltage dropped. 

I had a look at the log. Grid voltage was well within normal tolerances but the string voltage was 441V at the point the output dropped to zero. I need to do more analysis of the other figures since it seems there are all kinds of discrepancies which may or may not matter. Probably going to talk to the installers once I'm a bit clearer about what appears to be happening so I can at least give the impression of asking intelligent questions.

Grandad2b

Oh, I forgot to post yesterday's figures. Not really sure it's worth bothering: 
4.4kWh, 0.99 O's but today is at least half decent.

Grandad2b

Grandad2b said: today is at least half decent.

4.5 O's. That's more like it!

94JDH

22.25kWh for me - 3.45 O's from an East West flat roof system