cmnybo , 4 months ago

A car battery shouldn’t be discharged at all. They are meant to supply a short burst of power and then be charged back up again.

A deep cycle lead acid battery can be used to run an inverter. They can be discharged to 50% capacity while still providing hundreds of cycles. If they are used for a backup and are not cycled frequently, they can be discharged to around 80%, but they will provide a lot less cycles.

A LiFePO4 battery is definitely the better choice for anything that needs to be cycled frequently though.