Solar Calculators for Baltimore, Maryland

Free tools with illustrative Baltimore planning inputs. Replace energy rates and installation costs with your bill and written quote.

Quick answer

Start with your exact utility account and roof design. The 4.2 sun hours and 15.0 cents/kWh below are planning assumptions, not verified current rates for Baltimore. Confirm BGE eligibility and export settlement.

Notes updated 2026-07-26

Best for: Baltimore homeowners comparing a proposal or estimating savings before calling installers.
Inputs needed: 12-month kWh usage, roof shade, BGE, quoted $/W
Formula used: Local production = system kW × local peak sun hours × 365, then adjusted for losses.
Method references: NREL PVWatts, BGE, Maryland incentive rules

Peak sun hours

4.2

hrs/day planning assumption

Illustrative energy rate

15.0¢

per kWh (BGE)

Typical install cost

$3/W

planning assumption, not a market median

Net metering policy: Full retail net metering ✓

What Baltimore homeowners should check

Baltimore has humid summers, winter weather, mature trees, and a mix of pitched and flat rowhouse roofs. Roof access, parapets, shading, and the condition of older roof coverings can constrain the array.

BGE serves much of the city. Verify interconnection timing and Maryland incentive or SREC paperwork before treating those benefits as part of the guaranteed contract price.

At the state level, Maryland currently uses full retail net metering. A typical interconnection takes 4–10 weeks, but utility review and local permitting can extend that range. Check current rules before relying on a proposal's export-credit or installation-date assumptions.

What should I verify before signing a solar contract in Baltimore?

Confirm that the quote names your actual utility, uses a recent electricity rate, includes measured shade and roof-condition findings, and explains who handles permits and interconnection. Ask the installer to separate guaranteed equipment and workmanship terms from estimated production, incentives, and savings.

Illustrative 8 kW system in Baltimore

Annual production

10,537 kWh

Retail-value ceiling

$1,581

System cost (est.)

$24,000

Energy-only cost/value ratio

~15 yrs

Illustrative 4.2 peak sun hours, 14.08% production losses, 15.0 cents/kWh and $3/W. The retail-value ceiling assumes every kWh earns retail value; lower export credits reduce it. The cost/value ratio is not a full payback model and excludes repairs, financing and rate changes. No new Section 25D homeowner credit in 2026.