The amount of the federal battery subsidy depends on the usable capacity of the battery. As a guideline, it’s usually around 30% off the total installed cost. For example, a 13 kWh battery might qualify for roughly a $4,300 discount after rebate.

Battery lifespan varies by brand and usage, but most quality battery storage units come with a 10-year performance warranty. With normal use and maintenance, you can often expect 12–15 years of useful life.

Yes, in many cases, you can retrofit a battery to an existing solar setup. This can involve installing a new hybrid inverter or using an AC-coupled battery alongside your current system. The best option depends on your existing configuration and future energy needs. 

Every home uses energy differently, but if you often have excess solar during the day and use more power in the evening, a battery can make a lot of financial sense. It allows you to store surplus solar for later use, which can reduce reliance on the grid when electricity prices are highest. In many cases, this can result in a payback period of around 4 years and a simple return on investment of around 25%.