alt Hacker NewsI don't know what your exact situation is, but for some people you can consider other "battery" options. Almost everyone needs heat in some way (hot water, space heating) so if you're making a lot of excess electricity you could get an electric resistance hot water heater. It can be used to pre-heat your hot water before entering your main hot water tank, or be used to loop through your residence for hydronic heating.
This wouldn't be for everyone but there are other options to chemical batteries depending on whats easy for you to do.
In my case, I'm already using pretty much all my solar energy. So it's not that big of a deal for me honestly.
I'd like a hot water tank like that, but I don't really have the attic space to place it near my boiler. I have a gas powered CV unit, so I already have on demand hot water. Ideally I'd replace it for a hybrid boiler that would work of electricity until demand exceeds electric capability. But it's still well within its lifespan.