Solar PV - highest readings

Lemoncurd

How close can you expect the highest readings to get to the system kWp?

We have a 2.96 kWp system, Sharp panels and a SB 3000HF inverter, due south, no shading. Looking at the data from the inverter the highest reading we've had so far is 2.46kW. I know it is only March but I kind of expected to see it edge a bit higher than this at points. The best day so far (this month) has produced 15.2kWh.

Would be interested to know what kind of figures others have seen in relation to their system size?

free_juice?

My 3kW Inverter reached 2943 watts on Tuesday this week. The best results (for me) are not on cloudless days but when the sun pokes through fluffy white clouds.

Today is a big day for me, the first this year when the cumulative daily generation has got above the supplier's predicted figure. 369 generated by end of today, 365 predicted for January to 25 March.

My best day was 19th March. 18.74 kWh.

snowlad

My 3.7kw inverter has reached 3.5kw but i dont see it oftern as it is in loft. best day 23rd march 23.5kwh

malch

little 2.2kW system has done 12.6 kWh one day this week, in the last 7 days we have earned £30.60 in FIT and sellback to grid, plus whatever we have saved using washing machine, dishwasher ect. pleased :beer:

Cardew

Lemoncurd wrote: »

How close can you expect the highest readings to get to the system kWp?

We have a 2.96 kWp system, Sharp panels and a SB 3000HF inverter, due south, no shading. Looking at the data from the inverter the highest reading we've had so far is 2.46kW. I know it is only March but I kind of expected to see it edge a bit higher than this at points. The best day so far (this month) has produced 15.2kWh.

Would be interested to know what kind of figures others have seen in relation to their system size?

That depends where you live - the further South the better.

Provided your roof has the correct orientation and pitch in 'middle UK' you should just about get parity i.e. 1kW for each kWp on a very good day. In Cornwall you should exceed this slightly.

However don't forget that you are limited by the output of the inverter and some installers fit an inverter slightly smaller than the maximum output of the panels.

The reasoning for this is that the greater efficiency of the smaller inverter for 98% of the time, more than compensates for the 2% of the time the output could be higher than the inverter's rated output.

Note: no idea if 98% and 2% are representative but you get the drift! Also no idea if that reasoning is correct or just a ploy to fit a cheaper inverter!!

will-he-payitoff

free_juice? wrote: »

My 3kW Inverter reached 2943 watts on Tuesday this week. The best results (for me) are not on cloudless days but when the sun pokes through fluffy white clouds.

Today is a big day for me, the first this year when the cumulative daily generation has got above the supplier's predicted figure. 369 generated by end of today, 365 predicted for January to 25 March.

My best day was 19th March. 18.74 kWh.

Nice graph, be interesting to see after a full year.

jackieblack

The highest reading I've seen from my 2.22 kWp system has been 2095w (but I'm not at home all day to watch it )

Equaliser123

Hit peak (3kw on a 3.29kw system) several times - albeit not for that long.

We are WSW facing and have maxed 16.2kwh daily generation.

keith_r59

I'm not too sure what my peak readings are as I don't have a monitor but I do know that my system generated 40% more electricity than expected during March.

Equaliser123

jackieblack wrote: »

The highest reading I've seen from my 2.22 kWp system has been 2095w (but I'm not at home all day to watch it )

What size inverter do you have with that system?

jackieblack

Equaliser123 wrote: »

What size inverter do you have with that system?

It's a Fronius IG20.

Saw the monitor register 2109w briefly today:)