4.57Kw PV with a 4Kw inverter. Inverter too small?

[Bobster]

i know thanks, but 2 years ago they cleaned panels when fitting system and panels are self cleaning" if you believe paperwork". cheers Rob.

Self cleaning only stops mold and algi growing on the panels.

 

[v lowery]

Self cleaning only stops mold and algi growing on the panels.

thanks for that Rob I now know to, believe nothing a solar salesperson says or the claims they make on paper.

 

[tlsambo]

hi, I have solar panels 7 years, for the last 2 years I have solaredge upgrade and I have my yearly data the last 2 years are worse than my original set up. I am not seeing the 20% raise in electric as promised. checked weather patterns and we do seem to have had 2 years with 20% less light. any thoughts. solaredge cannot see I problem, I can as I have lost £2600 plus yearly interest for something that is losing me money.

Unless you have severe and i mean SEVERE shading you won't see a 20% increase from a Solar Edge system. More likely to be 2-5% depending on the degradation of your panels. Solar Edge helps to make up for the natural differences in each individual panel's output as they'll degrade at different rates. Unfortunately Solar Edge is often mis-sold with the classic broadband statement of 'up to' 20% increase in yeild. If your installer isn't using either PV Sol or PV Syst software to calculate the yeild then the figures won't be accurate.

 

[tlsambo]

thanks for that Rob I now know to, believe nothing a solar salesperson says or the claims they make on paper.

We've been carrying out a cleaning experiment on a Solar Edge monitored system so we can compare panels performance side by side. We clean one panel every 2 months, one every 6 months and one is left dirty. The difference in performance is around 0.3%.

 

[mrbroons]

As far I have read over supplying the inverter is done to assist with Winter generation. The inverter should clip the output to 3.68 kw see the following for the guidelines Western Power Distribution - G59 Connection procedure - https://www.westernpower.co.uk/Connections/Generation/Installation/G59-2.aspx. If a system was installed with 3.68kw of panels it would never see that value due to loses and non perfect generation conditions. So it is possible to over supply the inverter to effectively maximise the available generation throughout the year without tripping the G59 limitation. The inverter will simply cap or clip the generation to the value specified regardless of the panels attached (assuming they are within the inverter max spec) but this will mean that you will more often be generating a higher value rather than very rarely if ever getting near the rated capacity of the install.

 

[tlsambo]

hi, I have solar panels 7 years, for the last 2 years I have solaredge upgrade and I have my yearly data the last 2 years are worse than my original set up. I am not seeing the 20% raise in electric as promised. checked weather patterns and we do seem to have had 2 years with 20% less light. any thoughts. solaredge cannot see I problem, I can as I have lost £2600 plus yearly interest for something that is losing me money.

The common practice for these type of installers is to quote a figure of 'up to 20%'. If you've got severe shading, that means a pole, tree or chimney right in front of your array that will shade some part of your array throughout the day then yes, you may get close to a 20% increase in yield. This type of shading is very rare and most Solar Edge upgrades are likely to average between 2-5% increase in yield.

 

[tlsambo]

hi, I have solar panels 7 years, for the last 2 years I have solaredge upgrade and I have my yearly data the last 2 years are worse than my original set up. I am not seeing the 20% raise in electric as promised. checked weather patterns and we do seem to have had 2 years with 20% less light. any thoughts. solaredge cannot see I problem, I can as I have lost £2600 plus yearly interest for something that is losing me money.

The common practice for these type of installers is to quote a figure of 'up to 20%'. If you've got severe shading, that means a pole, tree or chimney right in front of your array that will shade some part of your array throughout the day then yes, you may get close to a 20% increase in yield. This type of shading is very rare and most Solar Edge upgrades are likely to average between 2-5% increase in yield.

 

[v lowery]

The common practice for these type of installers is to quote a figure of 'up to 20%'. If you've got severe shading, that means a pole, tree or chimney right in front of your array that will shade some part of your array throughout the day then yes, you may get close to a 20% increase in yield. This type of shading is very rare and most Solar Edge upgrades are likely to average between 2-5% increase in yield.

can it get any worse? I now have a optimizer failure , the installer has gone bust and solar edge will send out a free optimizer to another company which I have to pay £600./700 for scaffold and £300 to fit? have emailed solar edge as this is the 2nd failed optimizer and total system failure in 3 years that's 3 faults in 3 years they say they should last 25 years and are ultra reliable ? they never fail? so I got an email saying the 1st optimizer had "early stage failure" the other "random failure" so for something that never fails they have got names for them " still waiting for my reply to last email. 17 years left on tariff I could have no panels working by then.

 

[tlsambo]

Solar Edge will cover some scaffold costs, normally about £200 which would cover a tower and in most cases this will be enough as the installer will know which part of your array they need to access so won't need full scaffold. If it does cost a lot more then the installer can get permission from Solar Edge to claim a higher figure from them. I work for www.nakedsolar.co.uk and we don't charge for Solar Edge optimiser replacements as they now cover all our costs. Sorry we don't cover your area yet, we're getting there.