Bit of back-story is I am moving onta a canal boat so solar is going to be of massive importance to me. Did all my research and chad select panels based on being in a marina with almost zero shading. However, I am now going to be locating my boat on a river and shading is going to be an issue. Loosing even 1 cell on a panel to shading degrade the whole panel massively, this would be compounded by the fact I need to run 2 in series to up the voltage for my charge controller.
I have however come across a solution for this and I’m trying to figure out if it is cost effective but I’ve fallen at the first step. The solution is to place a bypass diode in for every cell in the array. This is a tried and tested solution but what is done traditionally is the bypass is put in for a string of cells. I want to do this for every cell to create the ultimate shade tolerant panel.
The cells are 0.5v and 9amps each. The panels I am looking to create will be 60 cell and I will be wiring 2 panels in series. Therefore, we are looking at a total open circuit voltage of give or take 80v at 10 amps more or less.
So the question is..
Does each diode only need to be the strength of the cell its bypassing say (1v 10Amp) or does its need to be strong enough to take the full open circuit voltage which is more like (80v 10amps)?
My feeling is for the full circuit flow, however I read a something last night suggesting you are only compensating for the imbalance caused by that one cell being in shade.
Any help would be greatly appreciated.
Thanks John
I have however come across a solution for this and I’m trying to figure out if it is cost effective but I’ve fallen at the first step. The solution is to place a bypass diode in for every cell in the array. This is a tried and tested solution but what is done traditionally is the bypass is put in for a string of cells. I want to do this for every cell to create the ultimate shade tolerant panel.
The cells are 0.5v and 9amps each. The panels I am looking to create will be 60 cell and I will be wiring 2 panels in series. Therefore, we are looking at a total open circuit voltage of give or take 80v at 10 amps more or less.
So the question is..
Does each diode only need to be the strength of the cell its bypassing say (1v 10Amp) or does its need to be strong enough to take the full open circuit voltage which is more like (80v 10amps)?
My feeling is for the full circuit flow, however I read a something last night suggesting you are only compensating for the imbalance caused by that one cell being in shade.
Any help would be greatly appreciated.
Thanks John
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