When a summer line of storms rolls off the Piedmont and takes BGE down across Towson and Catonsville, the houses that stay lit are the ones with a battery already on the wall. David Williams Electric installs whole-home battery backup — Tesla Powerwall and EcoFlow — for Baltimore County homeowners, with a fixed price quoted before the work starts and a 100% satisfaction guarantee. Maryland license #11734, 30-plus years on these panels.
Backup that fits how Baltimore County actually loses power
Most outages here aren’t dramatic — they’re a fallen limb on an older overhead BGE feeder in Pikesville or Parkville, or a substation hiccup after a nor’easter, and they last anywhere from twenty minutes to two days. A whole-home battery rides through that without the noise, fuel runs, or carbon-monoxide worry of a portable generator, and it switches over fast enough that your sump pump and fridge never notice.
We size the system to what you need carried: a Tesla Powerwall 3 (or two stacked) for a full Catonsville colonial running heat pump and well pump, or a more modular EcoFlow setup for a Towson rowhome or condo where the goal is fridge, internet, CPAP, and a few circuits through the night. We walk your panel first, then quote the real number — no “starting at” pricing that balloons on installation day.
Older panels, transfer switches, and the wiring we find behind the walls
A big share of Baltimore County’s housing stock predates 1970 — the brick Cape Cods and bungalows around Catonsville, Towson, and Pikesville often still run 100-amp or split-bus service, and a Powerwall’s backup gateway expects a clean 200-amp setup with room to work. We handle that honestly: sometimes it’s a straightforward whole-home backup off the main; sometimes it’s a protected-loads subpanel or a service upgrade first, and we tell you which before you commit.
If your home is one of the mid-century builds that got aluminum branch wiring, we make those connections safe by pig-tailing copper onto each device with ALUMACONN connectors — the listed repair — rather than tying a battery system into questionable terminations. Newer Owings Mills and Reisterstown subdivisions from the ’90s and 2000s are usually an easier install: modern 200-amp panel, clean run to the meter, battery and gateway mounted in a day.
Permits, BGE, and pairing with solar
Battery work in Baltimore County means an electrical permit and an inspection — we pull it, schedule the third-party inspector, and meet them on site so you don’t chase paperwork. If your system backs up the whole house and interacts with the grid, BGE has its own interconnection step; we’ve run it before and handle the application so the meter, the inspection, and the utility sign-off line up instead of stalling each other.
Already have rooftop solar, or planning it? A battery turns panels that shut off during an outage (anti-islanding) into power you can actually use after dark, and it lets you bank cheap midday production instead of exporting it. We wire Powerwall and EcoFlow to play nicely with both new and existing arrays, and we’ll tell you straight whether adding storage pencils out for your roof and your BGE bill.
Why Baltimore County homeowners call David Williams
Thirty-plus years wiring homes across this county means we’ve opened a lot of these panels before — we know what’s behind a 1955 Towson load center and what a Reisterstown builder cut corners on. You get a licensed master electrician (MD #11734) on the job, a written price agreed up front, clean work, and a 100% satisfaction guarantee. No subcontracted crews you’ve never met, no surprise change orders.
Frequently Asked Questions
Will a home battery actually run my whole house in Towson, or just a few circuits?
Either — it depends on your loads and budget. A single Powerwall comfortably carries the essentials (fridge, sump pump, internet, lights, a few outlets) for a typical Baltimore County home; backing up central A/C, an electric range, or a heat-pump whole-home setup usually takes two or more units. We do a load calculation on your actual panel and show you both options with real numbers before you decide.
My Catonsville house still has the original electrical panel. Can it take a battery?
Often yes, but many older Catonsville, Pikesville, and Parkville homes run 100-amp or split-bus service that a backup gateway wasn't designed around. We assess it first. Sometimes we install a protected-loads subpanel; sometimes a 200-amp service upgrade comes first. We'll tell you which path your home needs, and what each costs, up front — no guessing.
Do I need a permit and BGE approval for a home battery in Baltimore County?
Yes to both for a grid-interactive whole-home system. The job needs a Baltimore County electrical permit and inspection, and BGE requires an interconnection application. We pull the permit, meet the inspector, and file the BGE paperwork as part of the install so the three steps don't trip over each other.
Is a battery worth it if I already have solar on my Owings Mills roof?
Usually, yes. Grid-tied solar shuts off during an outage for safety, so without storage your panels go dark exactly when you need them. A battery keeps that solar power flowing after the grid drops and lets you store midday production instead of exporting it cheap. We wire Powerwall or EcoFlow to work with existing arrays and tell you honestly whether the payback makes sense for you.
Powerwall or EcoFlow — which one do you recommend?
It comes down to your home and goals. Tesla Powerwall is our go-to for full whole-home backup on larger Baltimore County homes with solar in the mix. EcoFlow is a strong, often more flexible fit for smaller homes, condos, or essentials-only backup. We're certified on both and quote the one that genuinely fits — not whatever's on the shelf.
Serving Baltimore County
David Williams Electric provides home battery installation throughout Baltimore County, including Towson, Catonsville, Owings Mills, Pikesville, Parkville, Essex, Reisterstown. Explore all Baltimore County electrical services or learn more about home battery installation across Maryland. Call (410) 781-4357 for a free, up-front quote.
