Solar battery installation in Charleston, SC

Local storage case

Why storage does or does not fit in Charleston

Charleston has a real argument for storage that has nothing to do with tax credits: the city sits directly in the hurricane track and the peninsula loses power in named storms. Add Dominion Energy South Carolina crediting exports at roughly 2.8 to 4.1 cents against a retail rate near 14.4 cents, and a battery here does two jobs at once rather than being justified by one of them.

We size for essentials over several days rather than for running central air, because that is what actually happens in a Charleston outage. Refrigeration, lighting, internet, phone charging, a well or sump where relevant, and enough headroom to sleep comfortably. Whole-house backup through a multi-day storm is a much larger and more expensive system than most people are imagining when they ask for it, and we would rather show you the difference in kilowatt-hours than sell the bigger number.

Placement takes more thought here than inland. Flood zones and elevation requirements affect where equipment can legally and sensibly sit, and salt air affects what enclosure specification is appropriate. On peninsula properties with limited exterior space, the interaction between clearance requirements and the available wall is often the real constraint on which product we can use, which is worth establishing before a model is chosen.

Written for Charleston specifically. Your own roof, bill and meter still decide the answer, which is what the free assessment settles.

The maths changed

Storing a kilowatt-hour now beats exporting one

Until the end of 2025, Dominion Energy South Carolina credited exported solar close to one-for-one. Sending surplus power to the grid was almost as good as using it, so a battery in Charleston was mostly about riding out storm-season outages.

That ended on December 31, 2025. Under Solar Choice, exports credit at roughly 2.8–4.1¢ per kWh on a time-of-use basis, with a rider of about $14 a month and a November true-up at avoided cost. You still buy power at about 14.4¢ per kWh. The gap between those two numbers is the entire case for storage.

A battery closes that gap. Instead of exporting afternoon surplus for a few cents and buying evening power back at full retail, you store the surplus and spend it yourself. For a household that is out during the day and home in the evening, this is the difference between a system that barely moves the bill and one that does what you expected.

We are not going to promise you a figure for that, because it depends on your usage shape and your rate. What we will do at the assessment is model your actual load profile against your actual rate and show you whether storage earns its cost at your address.

See the full rate picture on Charleston solar incentives, and how self-consumption drives payback on Charleston solar cost.