This may sound strange to some.
Let's say I have solar panels generating electricity. The electricity goes to charging up a string of lead-acid batteries. Once the batteries are fully charged that's it, but the sun is still shining. I could install a larger battery bank, but that's a lot of money.
Here's the strange parts: What if I remove the charged batteries of their acid and replace it with fresh distilled water and put those back to be charged? Then at night, if the batteries drain low I would remove this acid and replace it with the acid I removed earlier.
Could I store the electricity as excess acid?