The first thing you need to know about solar batteries is where you can store them for total round-trip efficiency. In addition to this, you will also want to see where you can store excess energy from your solar panel battery system.
The best place for you to keep your lithium-ion batteries or even other forms of solar batteries is in a place that has total insulation. Ensure that there is enough thermal mass and complete protection from the sun's rays.
If you want a good and continuous power rating, you should ensure that your solar battery is well protected. You can keep all your low-maintenance batteries, like AGM batteries, in your home itself. However, some solar batteries will need to be well kept in a shed or garage.