It is a very old question. Still if anybody needs, I used three sub categories of First-Fit-Decreasing (FFD) algorithm for distribution of loads to multiple renewable energy sources:

a) If the loads are very close, e.g. 200, 250, 150 watts etc., -> FFD Average-fit algorithm

b) If the loads are very different, e.g. 150, 20, 300 etc. ->FFD Best-fit or Best-fit algorithm.

c) If the total load is significantly less than the total renewable sources available -> FFD Worst-Fit algorithm.