Has anyone attempted an offgrid/renewable energy storage system wherein extra electricity would power lights on a recirculating algae system, which would then be turned into biodiesel and the algae composted for methane to be burned in a generator, then used as fertilizer for more algae in a relatively closed system? I was looking into batteries for a 20KW 1-week off-grid system the other week and it's an insane cost for something that has to be fully replaced every 10 years. I've also been fairly unimpressed with the flywheel and gravity storage systems due to sizes involved. It seems like this whole system could probably fit into something the size of a shipping container and scale quite large and long-term but I haven't found anyone doing it yet. Would there be any obvious issues with the system I'm missing?
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Any engineering system for stable algal production converges toward (a bad) lichen
The usual notion when C and O2 are in a system, someplace CO2 comes out. Ok, but managing Oxygen carefully is something life does well. Again: CH4 in, C-anything solid + usable energy. Combustion generally burdens such a process incredibly with unwanted high temperature products. No life science system works with effluents as hot as burning ... anything. Even if a processor had layer after layer of a microbial life to get C2 isolated its advantage procedurally compared to H2 is may be a game changer. Graphene-ish out I suppose is best. Diamond is a reference mtl in the notion too.