I'm posting this in a thread here since it might be useful for people. Please keep in mind that the below calculator contains bugs and doesn't do error checking - it's literally been 5 minutes to put together. Ok, so what does it do? It calculates the maximum open circuit voltage you would see on your solar panel string when the temperature drops. You just enter your Voc at 25C, the temperature coefficient (both should be available for panels in their datasheet, the former per panel and should be multiplied with the total panels per string in series, the latter is given as a percentage) and the coldest temperature you expect to experience at your location. The calculator gives, based on these numbers, the maximum Voc you could see on your string. Since this increases when the temperature drops, this info is needed to make sure your charge controller can manage. Also, you might want to build in some safety margin still.
Link to the calculator.
I'll work on improving if there is interest. It only takes in °C for now for example, and as I said, no error checking/input validation is done...
Other links of interest:
Link to the calculator.
I'll work on improving if there is interest. It only takes in °C for now for example, and as I said, no error checking/input validation is done...
Other links of interest: