Solar PV - highest readings

Equaliser123

jackieblack wrote: »

It's a Fronius IG20.

Saw the monitor register 2109w briefly today:)

That's interesting. I thought the max output of that inverter was 2kw.

I may well be wrong though.

raider

I had a 3.22 kWp system installed a week or so ago. 14 x 230w Sharp panels and a SB3000 inverter.

Best day so far was yesterday with 20.12 kWh, peaking at 2.78kW at around 1pm. I have seen the system briefly above 3kW (real time) several days ago, but I think the stored data averages output from the last 10 or 20 minutes, so never shows it over 3kW.

jackieblack

Equaliser123 wrote: »

That's interesting. I thought the max output of that inverter was 2kw.

I may well be wrong though.

I agree, 2Kw is what the documentation says, but I'm taking my reading from the Fronius IG personal monitor that was supplied....... can't explain it.

Mankysteve

jackieblack wrote: »

I agree, 2Kw is what the documentation says, but I'm taking my reading from the Fronius IG personal monitor that was supplied....... can't explain it.

Its not unknown for inverter panels to be a bit out. Hence why you need a separate meter for the supply people.

But it's only a increase ~5.5% which isn't much and it may well be the inverter and output that much.

free_juice?

raider wrote: »

I had a 3.22 kWp system installed a week or so ago. 14 x 230w Sharp panels and a SB3000 inverter.

Best day so far was yesterday with 20.12 kWh, peaking at 2.78kW at around 1pm. I have seen the system briefly above 3kW (real time) several days ago, but I think the stored data averages output from the last 10 or 20 minutes, so never shows it over 3kW.

With the same inverter I scored 19.90 and a peak of 2.69kW at 1pm (solar noon) although it was only a couple of watts lower during the surrounding 90 minutes. As you correctly say, the SMA logging system claims to record 15 minute averages. The highest peak I saw (not yesterday) was 2.993. Not sure if I believe it.

My SMA logger is consistently 1.1% behind the generation meter so my 19.9 may be 20.12 too.

raider

free_juice? wrote: »

With the same inverter I scored 19.90 and a peak of 2.69kW at 1pm (solar noon) although it was only a couple of watts lower during the surrounding 90 minutes. As you correctly say, the SMA logging system claims to record 15 minute averages. The highest peak I saw (not yesterday) was 2.993. Not sure if I believe it.

My SMA logger is consistently 1.1% behind the generation meter so my 19.9 may be 20.12 too.

From your website, looks like your 19.9 was from yesterday (9th), where as my 20.12 was from the 8th. Although I got 20.38 yesterday (9th) so very close to yours anyway.

My roof is at about 45 degrees, yours looks a lot less, so I guess you will probably surpass my output soon on similar days.

Will be interesting to compare your output to mine over the summer months. I'm near Norwich, so not to far off the same latitude as you I think (Nottingham?)

free_juice?

My roof is 30 degrees, due south. I am two miles south of the Thames between Woolwich and Dartford. I think I am affected by all those dioxin spewing incinerators they keep building around here. :eek:

free_juice?

jackieblack wrote: »

Saw the monitor register 2109w briefly today:)

Clear blue within white clouds seems to suit my system, it kept my SMA 3000 reporting above 3000w for a minute or so peaking at 3019. But overall it is not an exceptional day, with luck I think I might get to 15kWh.

raider

free_juice? wrote: »

Clear blue within white clouds seems to suit my system, it kept my SMA 3000 reporting above 3000w for a minute or so peaking at 3019. But overall it is not an exceptional day, with luck I think I might get to 15kWh.

I've noticed on a clear day with no clouds I usually peak around 2.8 kW, but with the sun shining and some clouds in the sky, I peak just above 3kW. I assume this has to do with the light duffusing on the clouds and giving a boost to the panels. Anyone know if that's correct?

Slightly off topic, but does anyone know if "rEd" appearing on my import meter is an issue? I believe it stands for "Reverse Energy Detected". Should I contact my supplier about it or not bother?

Pryderi

The answer to this must be that sunny days with cumulus tend to follow behind cold fronts. The air comes from the Atlantic and is unpolluted. High pressure systems are associated with a temperature inversion which traps smoke haze, much of which is imported from the Continent.
My 3.33kWp system was showing peaks of 3.2kWh today, with loads of cumulus around but deep blue sky in-between. Total generation was 18kWh.
The previous 4 days were anticyclonic with greater daily generation [19-20 kWh] but with generally cloud-free milky blue skies, and with peaks only to 2.8kWh.