Hello Everyone,

I've got a relatively new setup with a Deye inverter, 20 no. JA SOLAR JAM60D40 500W panels and a Felicity battery.

Two strings of panels, one facing East, the other West - equal split.

I've got SA setup and running, using a Y-splitter cable (RS port on inverter split and one cable to SA RPi, the other cable to the battery).

Readings et al seem fine, but I'm having a little trouble setting up the forecast on the dashboard.

Display Settings

• Max grid power 5000

• Max solar PV power 10000

• Max battery power 16000

• Solar prediction enabled

Configuration > Advanced

• Lat & Long (correct, and checked) - based in central Poland

• Tilt 25.0

• Azimuth 0.0

• Temp coefficent -0.29

• NMOT 45.0

Now the azimuth at zero, is I'm trying to accommodate both strings in the forecast, so true south would be logical right?

Or am I trying to be too clever? and I just have to pick one string for the forecast?

Here is today's forecast.

3 hours ago, Partridge0056 said:

Now the azimuth at zero, is I'm trying to accommodate both strings in the forecast, so true south would be logical right?

Or am I trying to be too clever? and I just have to pick one string for the forecast?

Personal opinion to consider with caution only.

I see what you're trying to do, or why, but you can appreciate, I'm sure, that it's not precise, because your East/West configuration pulls your production earlier and later in the day, and flattens the peak production.

Perhaps if you do that, try to experiment with finding the peak forecasted value if you face all the panels East, and/or all the panels West. And then de-rate your Max Solar PV value in the SA setup, depending on the expected lower peak power generation that you see in those alternative forecasts. It could be for argument's sake that you say you've got 10% less PV, or 9000W estimated.

Most days the forecast won't matter much, if your battery is charged by 10am in the morning.