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.