It's probably the trader stage, though I don't know what levels are necessary to get them to show up or to show up more often. I've seen only a few solar cells - 1 tier 6 and I think a couple tier 3. Normally I'd have one bank of at least tier 4-5 cells by now. So it is definitely much slower. They probably need to adjust things so they aren't so rare. A solar bank without all cells filled is almost not even worth using so solar has become a pain in A21.
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It's probably the trader stage, though I don't know what levels are necessary to get them to show up or to show up more often. I've seen only a few solar cells - 1 tier 6 and I think a couple tier 3. Normally I'd have one back of at least tier 4-5 cells by now. So it is definitely much slower. They probably need to adjust things so they aren't so rare. A solar bank without all cells filled is almost not even worth using so solar has become a pain in A21.