Renewables: "talking 'bout my generation"

tunnel

Ner ner ner neeer ner, ner ner ner ner ner


Guess what, 1 big fat Hawawaiii and lots of instantly pourable alcohol ===== Me happy

sly_dog_jonah

Yesterday was our 7th Hawaii in a row, with an average of 5.5 Os per day since the moist last Saturday we had.

legoman62

sly_dog_jonah wrote: »

31 days in July, so 5 days left. 447.3kWh in the tank for July already, but we're unlikely to beat last July's record of 561kWh. Hopefully we'll beat June 14 when we clocked up 517kWh and this will be the 2nd best month ever.

Same here. Hawaii + 0.62 O's = 22.5kWh yesterday:T

437kWh so far this month..... July 2013 made 559kWh:)

Oscargrouch

tunnel wrote: »

Ner ner ner neeer ner, ner ner ner ner ner
Guess what, 1 big fat Hawawaiii and lots of instantly pourable alcohol ===== Me happy

You can't beat a stock of instantly pourable........and another 23 btls ready for this Sat......:rotfl:

http://wattson.energyhive.com/dashboard/oscarsenergy

tunnel

Oscargrouch wrote: »

You can't beat a stock of instantly pourable........and another 23 btls ready for this Sat......:rotfl:

LOL,
And here I was beginning to think I may have a problem

groovyf

With all this good weather this past week... not one Hawaii... but teetering soooooo close each day! The heat certainly seems to affect panel efficiency more than I expected.
Just hit 102% estimate for this month, so this will most definitely be my best since install.

For instance, avergaing around 2.8 peak, whereas with the sunny but slightly cooler weather of a couple of weeks ago I was just about maxing out the inverter.
Now... Why hasn't anyone come up with an idea of cold water pipes running behind the panels to cool them down, and maybe even heat said pipe water and diverting to a tank for usage

shavy65

groovyf wrote: »

The heat certainly seems to affect panel efficiency more than I expected.

Me too! As this is my first summer I`ve been very surprised at the affect the higher temp has on panel efficiency.....even up here in far NE Scotland Anyone got any figures on this? i.e. efficiency % drop for each temperature degree increase....

I remember when I got my installation prediction for the year back in Feb I wondered why May was down as the best month and not June/July.

Martyn1981

shavy65 wrote: »

Me too! As this is my first summer I`ve been very surprised at the affect the higher temp has on panel efficiency.....even up here in far NE Scotland Anyone got any figures on this? i.e. efficiency % drop for each temperature degree increase....

I remember when I got my installation prediction for the year back in Feb I wondered why May was down as the best month and not June/July.

Hiya Shavy, you'll need to look at the specific datasheet for a particular panel make/model, but generally their power output is stated at about 25C. Give or take, most panels seem to lose about 0.4% performance per 1C rise, or 1% for 2.5C rise (IYSWIM).

So 25C rise should knock about 10% off performance.

Remember this is the panel temp, not the air temp, so think hot metal car in the sun, not air temp.

I've been seeing my ESE system running at about 70 to 75% this last week (approx 2.6kW from 3.58kWp), whilst sitting in constant sun, clear sky, but no wind to cool the panels, and flush out the hot air build up. But, regardless, lots of nice generation, and looking like a very good July, possibly 120%. Fingers crossed.

Mart.

shavy65

Martyn1981 wrote: »

Hiya Shavy, you'll need to look at the specific datasheet for a particular panel make/model, but generally their power output is stated at about 25C. Give or take, most panels seem to lose about 0.4% performance per 1C rise, or 1% for 2.5C rise (IYSWIM).

So 25C rise should knock about 10% off performance.

Remember this is the panel temp, not the air temp, so think hot metal car in the sun, not air temp.

I've been seeing my ESE system running at about 70 to 75% this last week (approx 2.6kW from 3.58kWp), whilst sitting in constant sun, clear sky, but no wind to cool the panels, and flush out the hot air build up. But, regardless, lots of nice generation, and looking like a very good July, possibly 120%. Fingers crossed.

Mart.

Thanks for that, very informative. I`ve seen big drops in generation since the warmer weather. Back in May I broke the elusive 30 kWh barrier and presumed I`d do even better over the last couple of months but the last couple of blue sky days have seen me hit 24/25ish. Still, I`m not complaining! Generated about 2400kWh since Feb 26th.....still no cheque yet though :question:

tunnel

No Hawaii today, "only" did 4.6 O's(30kWh).....so so disappointing
May have to hit the to console myself