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K

kevhky

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Hi, first off im Kev, hello to everyone to the forum

Just two weeks ago had a pv system installed but im not reaching my peak as so i think my system is as follows

14 x REC 240w panels total 3.36kw
1 x Powerone aurora unu 3.6kw inverter
South facing
roof angle 30 degrees

over the previous two weeks we have had some particular good sunshine days (well only a couple) but my highest peak since install is only 2.77kw

on these particular sunshine days it was midday and the sun was directly shining straight at me roof

I though on days like this i should be achieving maximum peak of at least 3.3kw - 3.4kw

Any thoughts on this or am i expecting too much

Thanks in advance

Kev
 
Aico 3000
F

FB.

  • Thread Starter Thread Starter
  • #2
Recently my panels have only been running at about three-quarters of their maximum potential (2.7kW being produced with 3.7kW of panels and the same 3.6kW inverter as you).

Hot weather drops the output.

There also hasn't been much of a breeze to cool the panels recently.

....and round here (edge of the East Anglia fenland) it continues to be quite misty at times due to the evaporation from still-wet ground (normally we don't get much rain - it's only fenland because it's at or below sea level).

The panels should get closer to peak capacity when it's cooler and breezier - spring and autumn.
Of course, in spring and autumn the days are shorter, so although the daily peak may be highest in spring and autumn, the total daily generation probably won't be.
 
S

sedgy34

  • Thread Starter Thread Starter
  • #3
That's seems reasonable the hotter it gets its performance is slightly lower
 
K

kevhky

  • Thread Starter Thread Starter
  • #4
Hot weather drops the outpu
I realised this but a psl of mine who lives pretty much 2 mins away had his installed the same time
he has a 3.9 system and same inverter as me 3.6 aurora and he is peaking at 3.6

He has 16 panels rather than my 14

To me it just dont add up

My system
3.36kw with 3.6 inverter facing south with no shade

Mates system
3.9kw with same 3.6 inverter facing east 6 panels east 10 panels west

Any thoughts

Kev
 
P

PengEF

  • Thread Starter Thread Starter
  • #5
Mine was fitted about same time as yours. We are probably in different parts of the country so direct comparisons are not going to help. However last Sunday I had the best day so far and generated 26.7kWh. Was made up put the peak was way down at 3.4kW for a 4kW system facing SSW with zero shade. Now yesterday with a lot of cloud and the odd sunny spell I got 18.2kWh but it peaked at 4.06kW. Last Sunday with wall to wall sunshine the panels just got too hot. Yesterday and today conditions were right to get very close to the peak output at times but rubbish for sustained generation. Swings and roundabouts. Yours does sound low but it's almost impossible to say if something is wrong on just 2 weeks generating I would think but I am no expert.
 
B

babba

  • Thread Starter Thread Starter
  • #6
Mine was fitted about same time as yours. We are probably in different parts of the country so direct comparisons are not going to help. However last Sunday I had the best day so far and generated 26.7kWh. Was made up put the peak was way down at 3.4kW for a 4kW system facing SSW with zero shade. Now yesterday with a lot of cloud and the odd sunny spell I got 18.2kWh but it peaked at 4.06kW. Last Sunday with wall to wall sunshine the panels just got too hot. Yesterday and today conditions were right to get very close to the peak output at times but rubbish for sustained generation. Swings and roundabouts. Yours does sound low but it's almost impossible to say if something is wrong on just 2 weeks generating I would think but I am no expert.
Its hard to believe the SPLIT system of the OP mate is peaking so high ?
 
B

babba

  • Thread Starter Thread Starter
  • #7
Why the 3.6 and not the 3.0 Powerone if you were looking for peak performance.
 
K

kevhky

  • Thread Starter Thread Starter
  • #8
Its hard to believe the SPLIT system of the OP mate is peaking so high ?
I agree but ive seen it for myself


Last Sunday was my highest 19.5kw generated that day
my mate generated 21kw

Its baffling how i have the south facing with no shade, yes i do have two less panels but i should surely be matching at least

My panels are REC 240w and his are Canadian 245w

Kev
 
K

kevhky

  • Thread Starter Thread Starter
  • #9
Mine was fitted about same time as yours. We are probably in different parts of the country so direct comparisons are not going to help. However last Sunday I had the best day so far and generated 26.7kWh. Was made up put the peak was way down at 3.4kW for a 4kW system facing SSW with zero shade. Now yesterday with a lot of cloud and the odd sunny spell I got 18.2kWh but it peaked at 4.06kW. Last Sunday with wall to wall sunshine the panels just got too hot. Yesterday and today conditions were right to get very close to the peak output at times but rubbish for sustained generation. Swings and roundabouts. Yours does sound low but it's almost impossible to say if something is wrong on just 2 weeks generating I would think but I am no expert.

Good stuff mate, obviously keeping a close eye like myself :0)

Like you say it is swings and roundabouts but i just want to see mine peak so i know all is working ok

Im from north east, UK


Kev
 
Last edited by a moderator:
K

kevhky

  • Thread Starter Thread Starter
  • #10
Why the 3.6 and not the 3.0 Powerone if you were looking for peak performance.
Well my panels are 3.36 so isnt that what i should peak at, im led to beleive thats the case

Kev
 
whinmoor

whinmoor

-
Arms
I would have been tempted to go for the 3.0 rather than 3.6 on this setup. Not much in it as you are caught between two stools but the lower rated inverter may be more efficient on cloudier days which are generally more common in this country. Maybe the 3.6 would be better down south and the 3.0 better up north.
 
K

kevhky

  • Thread Starter Thread Starter
  • #12
I would have been tempted to go for the 3.0 rather than 3.6 on this setup. Not much in it as you are caught between two stools but the lower rated inverter may be more efficient on cloudier days which are generally more common in this country. Maybe the 3.6 would be better down south and the 3.0 better up north.
I just went with what the company reccomended

The inverter has two strings but they only used one

Kev
 

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