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MattyNeth

Hi - I have a 2.99kW solar array, and the top output I have had had previously been yesterday's 2800w at one point at lunchtime which I was more than pleased with as I was under the impression the maximum could be 2999w? Today on 3 occasions output was over 3000w (peak was 3080w). Have I got the wrong end of the stick here?!
 
On the MSE forums a member has posted that her Sanyo HIT 3.84kWp and 4.4 Eltek HE-t inverter has peaked at 4.458kW and held for 15 minutes which confuses me!
 
The stated output is under standard test conditions. In certain combinations of sunlight and temperature, it is possible for panels to exceed their nominal rating.

In addition, it is possible for a 3.6kW "G83/DNO-approved" inverter to exceed 3.6kW output if the local grid voltage is higher than 230V.

I posted the following a few days ago, where my KV-250 panels were managing as much as 265W, and my 3.6kW inverter was managing to put 3.7kW into the grid.

Link -> http://www.electriciansforums.net/photovoltaic-solar-panels-green-energy-forum/54687-full-power.html

.
 
Oh, and the inverter's on-screen readings were confirmed by me using a stopwatch to time the rate of flashing on the generation meter next to the fusebox; the rate of flash was about 20 flashes per 19 seconds (meter does 10 flashes per 0.01kWh) and it repeated this phenomenon today just before lunchtime.
 
Panels also have a tolerance of eg +/- 3% this varies from panel to panel!

I would expect that all panels in the array would need to be operating at that higher level, otherwise the array woudl run at the ability of the weakest link.


The KV's in my array are stated to be 0 to +5 W tolerance, and are sold as a variety of models, simply sorted by their "flash" test at the factory. For example, there's KV240 (240-244.9W), KV245 (245-249.9W), KV250 (250-254.9W) panels which are identical, other than some had a higher flash test output than others and have been sold at a better price.

But the output, as mentioned earlier, is quoted under standard conditions of light and temperature.

A few days ago, when my KV250's approached 265W, but it was a very sunny, very clear, cool and breezy day. The sun was probably as strong as standard test conditions, but it was cooler and breezier, which probably helped boost the output of the panels compared to a hot day.
 
Isn't the capacity the safe continuous output? i.e. the safe continous capacity in the O.P would be 2.99kw but that dosen;t mean it cannot exceed it , just not contiunously?
 

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