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I intend to put up 2 strings of 410 w panels
Each string will be 7x410 w panels.
I have checked on the calculator and it seems I am 20 v over the limit for the rated MPPT at 130%
My question is- will that fry the MPPT or allowable as the min temp in UK in norfolk wont go down much below -7 or -8 in winters?
How much temperature margin do you have i.e. using the calculator with the exact parameters for your panels at what temperature do they give you 250V on open circuit?
As I recall, 2 strings of 5 Longi 405W panels were the most I could put on a 250/70. Apart from voltage considerations 2 strings of 7 is seriously over-panelled, do you have a particular reason for this?
I bought 14 panels so was trying to see if it was feasable.
Thanks everyone,
Ive decided to go for the smartsolar mppt rs 450/100-tr to leave room for further expansion.
<to leave room for further expansion>
50V x 100A is only 5kW.
So at 5740W the nominal output of your 14 panels is more than the max power rating of a 450/100, it will work OK but is already overpanelled.
