PatBlack
Genius in Irrelevant Topics
- Joined
- Sep 21, 2019
- Messages
- 49
That's not really what over-panelling means.
If you take any SCC, it will have a maximum charge current rating, in the case of the Victron SmartSolar 100|20 mentioned above, that's 20A (see table below). Delivered at 12V(nominal) that basically means a nominal output power of 292W (14.6V x 20A = 292W). In other words, you need at least a PV array of 292W in order to supply the SCC's nominal power output.
The thing is, it is very rare that you will actually get 292W out of a 292W PV array e.g. angle to sun, temperature, latitude from the equator etc so most people over-panel their arrays by some percentage, Victron recommend 30%. This means that you would install a 380W (292W x 30%) array in order to supply a 292W nominal output.
Yes, thanks, that helps a lot! I knew I wasn't following what was being said. Learning a lot of terminology on here, among other things!