When a summer storm rolls off the Piedmont and takes out a tree-lined BGE circuit in Wilde Lake or Centennial, the power can stay off for hours. David Williams Electric installs whole-home battery backup that keeps your lights, well pump, sump, and refrigerator running through it. We are a Maryland-licensed electrician (#11734) with more than 30 years in the trade, and we quote the job up front with a 100% satisfaction guarantee on the work.
Battery backup sized to your Howard County home
A 1970s split-level off Twin Rivers Road in Columbia and a 2015 build in Maple Lawn have very different panels behind the drywall, and the battery plan has to match. Many of the original Columbia village homes still run a 100- or 150-amp panel, sometimes a split-bus board with no main breaker, which changes how a battery and its backup gateway tie in. Newer Clarksville and Fulton houses usually already have a 200-amp service and plenty of garage wall for an enclosure.
We start by reading your actual panel and your real loads, not a brochure number. A Tesla Powerwall 3 holds about 13.5 kWh and carries the whole house for most outages; EcoFlow’s whole-home setup pairs a battery with a smart panel when you’d rather back up specific circuits. We tell you which one fits, how many units it takes to ride out a typical overnight outage here, and what it costs before any work starts.
Whole-home or critical-load: what you actually back up
There are two honest ways to do this, and the right one depends on your house. A whole-home approach puts a transfer gateway ahead of the main panel so everything keeps running, which suits the all-electric homes going up in western Howard County around Glenwood and Woodbine. A critical-load approach backs up a smaller subpanel: the furnace, well pump, sump, fridge, internet, and a few outlets, which is often the smarter spend on an older Ellicott City home with a 150-amp service.
If you’re on a well and septic out past Route 97, the well pump and the sump are the loads that matter most, and we size the battery around riding those through a multi-day winter outage rather than running the central AC. We’ll walk your house and tell you plainly which approach gives you the most useful runtime for the money.
Permits, inspection, and pairing with solar
Energy storage in Maryland needs a county electrical permit and a passed inspection, so we pull the permit through Howard County Inspections, Licenses and Permits and meet the inspector ourselves. The current code has real rules for these systems: rapid shutdown, working clearance at the panel, and where the enclosure can sit relative to bedrooms, which is why a garage or exterior wall is usually where it lands.
If you already have rooftop solar or you’re adding it, a Powerwall or EcoFlow battery stores what the panels make during the day so you keep that power after the sun goes down and through a BGE outage. Pairing also positions the system for the Maryland Energy Administration storage tax credit and the 30% federal clean-energy credit, both of which apply to home batteries; we’ll point you to the current paperwork, though we leave the tax filing to your accountant.
Why homeowners here call David Williams
This is residential electrical work done by the same licensed electrician who shows up, reads your panel, and stands behind the result. More than 30 years on the tools across Columbia, Ellicott City, Elkridge, and the rest of the county means the surprises behind a 40-year-old load center rarely surprise us. Aluminum branch wiring in an older home gets handled the right way, with pig-tailing to copper using ALUMACONN connectors, not a quiet patch.
You get a written, up-front price before we start and a 100% satisfaction guarantee on the install. No hourly meter running while we figure out your house on your dime.
Frequently Asked Questions
How long will a battery keep my house running during a Howard County outage?
It depends on what you back up. A single Tesla Powerwall (about 13.5 kWh) typically carries a critical-load setup, the furnace, well pump, sump, refrigerator, and lights, through an overnight or multi-day outage if you skip heavy loads like central AC and an electric range. Back up the whole home or run the AC, and you'll want two units. We size it to your real loads and tell you the honest runtime before you buy.
Do I need a permit to install a home battery in Howard County?
Yes. Energy storage systems require a county electrical permit and a passed inspection through Howard County Inspections, Licenses and Permits. We pull the permit and meet the inspector as part of the job, so you're not chasing paperwork. As a licensed Maryland electrician (#11734), we install to current code, including rapid-shutdown and panel-clearance rules.
Can a battery work with the rooftop solar on my Clarksville or Fulton home?
Yes, that's one of the best reasons to add one. A Tesla Powerwall or EcoFlow battery stores the solar your panels make during the day so you can use it at night and during a BGE outage instead of sending it back to the grid. If you don't have solar yet, we can still install the battery now and it will pair with panels later.
Will a Powerwall power my well pump if I'm on a well and septic out near Woodbine?
It will, and for rural western-county homes that's usually the whole point. We size the battery around the well pump and sump pump in particular, since a deep-well pump draws a heavy startup load. We confirm the pump's requirements against the battery's surge rating before we quote, so you're not left without water during a storm.
What does a home battery installation cost, and how do I get a price?
We give you a written, up-front price after we look at your panel and loads, no hourly surprises and no obligation. Cost depends on the battery you choose, how many units, and whether your panel needs an upgrade to support it. Many older Columbia and Ellicott City homes on a 100- or 150-amp service need a service upgrade first, and we'll tell you that honestly before any work begins. The job is backed by our 100% satisfaction guarantee.
Serving Howard County
David Williams Electric provides home battery installation throughout Howard County, including Columbia, Ellicott City, Elkridge, Clarksville, Fulton, Glenwood, Woodbine. Explore all Howard County electrical services or learn more about home battery installation across Maryland. Call (410) 781-4357 for a free, up-front quote.
