Renewables: "talking 'bout my generation"

pinnks

Hmm, that's odd. Thought it was only Microsoft that had undocumented features - lol

ajbell

Good day here. 2.7 Os.

Martyn1981

matty2767 wrote: »

I had my 4kw system installed in October but I haven't seen instantaneous readings to go above 2.5kw. Is there a way of interegating the panels from the invertor to see if they are working properly

Hiya, what orientation and pitch are your panels?

I think 2.5kW sounds ok.

How's this for extremes:- due to orientation and pitch, my daily target for yesterday was 3.3kWh. BUT I got a lovely 8.2kWh. However, I never saw total gen go above 1.4kW (roughly 1.3kW ESE + 0.1kW WNW, slowly changing to 0.3kW ESE + 0.4kW WNW).

In the summer I can see 4.2kW (11am to 3pm) and short spikes of 4.9kW. With total gen on a long good day of 34kWh.

Mart.

Martyn1981

Exiled_Tyke wrote: »

Am I being overly optimistic or do my assumptions seem reasonable.

Thanks (in anticipation) for any opinions.

Hiya ET and welcome. Obviously there's a fair bit of guess work at this time of year, and having days vary from zero to perhaps 300% of target doesn't help. But I doubt your optimism is extreme.

Best bet is to work out your monthly figures using PVGIS (just do it twice, once for W and once for S and add together).

Then see how you do each month against those estimates. You will have to hold your nerve, as Nov & Dec were horrific, but (for me) Jan seems on target. Just remember to read comments on here, that should give you a good gut feeling for whether a month is poor, average or good. If your performance (against PVGIS) is similar, then 'happy times'.

See my earlier post for off-south, shallow(ish) panel performance, it makes a huge difference. My system has an 8:1 ratio of June v's Dec, whilst an average pitch south system is probably about 4:1. Your slightly west weighted system is probably 6(ish)?

[Edit: since the west panels have issues, shading and extreme shallow (5 of my ESE are at 20d), then perhaps your ratio will be closer to 7:1 ..... but I'm clearly guessing now. M.]

Mart.

Exiled_Tyke

Thanks Martyn, all appears to be very sound advice. I will do the analysis you suggest. Also your notes on pitches and ratios are very helpful. I don't need to be too concerned whether the numbers come out at 6,7 or 8:1 but knowing that numbers in that region are not unusual does make me more hopeful that things will pick up very positively as we head into spring. I will however do the maths and report back in due course!

Cheers!
ET

Merlin139

0.566 O's

Dull day!

legoman62

0.4 O's here today:(

Gonna be warmer tomorrow....but raining all day:eek:

Oscargrouch

Exiled_Tyke wrote: »

Thanks Martyn, all appears to be very sound advice. I will do the analysis you suggest. Also your notes on pitches and ratios are very helpful. I don't need to be too concerned whether the numbers come out at 6,7 or 8:1 but knowing that numbers in that region are not unusual does make me more hopeful that things will pick up very positively as we head into spring. I will however do the maths and report back in due course!
Cheers!
ET

Spring will make a great difference, as seen by my signature, my system was installed Nov '11. From history, this is my worst 1/4 of the year; so every other month is better. An example: last year '14 - '15 Nov 23 - Feb 22 '15; I made 91.2 O's...:eek:

0.44 O's today; not good.....

ajbell

0.41 Os yesterday.

edwink

0.50 O's for us yesterday.


Edwink