Backup power is the LEAST interesting thing your home battery can do
Almost everyone positions home solar panel systems with home batteries as backup grid power insurance – and while that can be vitally important in a whole host of “what if” scenarios, keeping the lights on is the LEAST interesting thing your home battery can do.
Home backup battery. It’s written right there on the tin, after all – but while keeping the lights on, the water running, and the insulin between 36 and 46° F can be critically important, more and more home solar + battery customers are looking at their systems as a tool to help them understand how they use and consume energy.
And that little bit of understanding can lead to some big savings.
A hedge against rising energy costs
When we talk about the cost of electricity, we often think of it in terms of price per kWh (example: $0.20/kWh). As more and more people move towards time-of-use rates, however, they’re starting to see huge swings in pricing, with the same kWh costing $0.50 one day, and close to zero – or even dipping into the negative – on another.
In that scenario, a home battery becomes less about planning for when the power goes out, and more about planning for when the power gets expensive.
A home battery turns your electricity buy into a Costco run, allowing you to stock on on electrons when the utility is practically giving them away, storing them in your garage freezer battery, and using them when the utility decides to price them higher. The end result isn’t just lower utility bills, it’s increased predictability in your monthly budget, and more control over an expense that most people consider out of their control.
In practice, someone with a 20 kWh home battery system in Illinois’ ComEd territory (where I live), electricity that typically costs about $0.10/kWh has spiked to more than $2/kWh during extreme weather events, with a theoretical ceiling of $3.70/kWh. That means the 20 kWh sitting in you battery that’s worth about $2 on a normal day can be worth as much as or as much as $40, $50, or even $70 when prices surge.
Your own private gas station
When matched up with a home solar panel system that generates electricity and an EV that runs on electric fuel, a home battery system starts to look a lot like your own private fuel supply, allowing you to top off your tank with cheap gas electrons you made yourself.
“This is Energy Dominance,” writes GM Energy’s Jim Reilly, describing his own home’s high-end energy setup. “I own the refinery and the delivery system. While the world reacts to the price at the pump, my costs are a flat line.”
A passive investment that keeps paying off
What really sets a home solar panel system apart from most other big-ticket purchases is that it can behave a lot like an investment, with the average homeowner breaking even on their installation in about 10 years – with another 10-15 years’ worth of energy production still to go.
Those returns don’t just show up on your utility bill, either. A recent study tracking the sales of more than 5,000 single-family home deals showed that homes with solar panels installed sold for 5-10% more than comparable homes without solar. For those of you doing the math at home, “(that’s) an eye-popping $39,500 to $79,000 boost.”
Published April 13, 2026 2:24PM
