[marcosdumay]

For a house-sized storage, you may want flow batteries. Handling gases is expensive and full of unexpected problems, while molten solids is relatively easy.

Hydrogen storage makes sense for a country, not for anything smaller. LNG storage may make sense for a city grid, if our tech advances. Anyway, you really don't want those on your backyard.

Anyway, even though they are simpler, flow batteries may create enough problems so that you don't want them on your backyard either. I will repeat the sibling that recommended just getting more panels.