Hi, I currently am not exporting to the grid due to the high cost of installing an AMI meter but since this has come down it may now become financially viable. I know the cost of installation but need to determine how much I could be able to export to the grid. Is there a way to compare the forecast vs actual yield (in kWh) over a longer period of time? My thinking is that assuming the forecast is accurate deducting the actual yield from the forecasted one should give me the available capacity for grid feed in. Or are there other ways of estimating how much I could realistically expect to export to the grid? I did not find anything after doing a search. Thanks
As a person who has used everything from Helioscope to the free stuff i have not found something that is accurate.
The click and design on victron professional is ok for general idea of you set it up right.
You would need to know what you would be using too.
But rule of thumb is peak solar hours x irradiance x installed power for a general idea.
For example. The area I am currently installing i get 5.5 to 7 kw/m² installed.
General solar day (peak production) for this season is 5 hours. (Yes sunrise and sunset time is much longer than this)
An array of 5500watts will yeild 3025w (using the lower figure). X 5 hours (of good sun unshaded facing the optimal orientation) is 15kWh of power per day at least for this season. (generally size and calculate yield on the shortest day for system sizing so clients don’t end up with a fair weather system.)
Of course wild card is always the weather. That you would have an idea of yourself for where you are.