How do i match up 48 cell solar panels when they don't make them
Date: 02/15/2013
FAQS Summary:
Three 48-cell modules in series equals a total of 144 cells in series, which is the same as two 72-cell modules in series, so that should work fine
FAQS Content:
How do i match up 48 cell solar panels when they don't make them anymore? I currently have 3 strings of 3 x 48 cell panels. Most modules made today are 60-cell, although there are some 72-cell modules made. Three 48-cell modules in series equals a total of 144 cells in series, which is the same as two 72-cell modules in series, so that should work fine, as long as the new string of modules is in parallel with the old module strings. You probably don't want to use the new modules in the same series string with the older modules unless the voltage and amperage are very close, but adding a new string in parallel will work. When you are wiring modules in series, it doesn't matter how many cells are contained in each "package" (module). Only the total number of cells in series matters. For instance: six 60-cell modules in series would have 360 cells in series (6 x 60 = 360), and that would create the same DC voltage as having ten 36-cell modules, or five 72-cell modules, in series. The total cell count determines the string voltage, although there is some variation between cell types and brands. Electrically, it doesn't matter how many cells are contained in each frame. Cell size (6" diameter, 5", etc) determines the amperage ratings, so you don't want to mix cell sizes in one series string.
