If you're considering backup power for your Northern Virginia home, understanding the scope is essential for budgeting. AJ Long Electric installs complete portable-generator hookups for customer-provided generators. For battery projects, we can include compatible listed equipment in an approved scope or connect customer-selected listed equipment; the written proposal identifies exact equipment and responsibility boundaries.
Key Takeaways
- A portable generator hookup — inlet plus listed transfer or interlock equipment — typically runs $900–$2,500; the generator itself is a separate homeowner purchase.
- A battery power station with installation typically runs $2,500–$6,000 for a portable-unit setup.
- Whole-home battery integration runs $6,000–$15,000+ depending on capacity and circuits.
- Hardwired transfer-switch and smart-panel work needs an electrical permit, but there is no gas permit for a battery install.
Total Installation Cost Ranges
The right number depends on which path you choose. Here are typical Northern Virginia ranges. Treat these as estimates, not guarantees - an on-site visit produces the real figure.
Planning Backup Power for Your Home?
Plan for the next outage with a listed portable-generator hookup or a compatible battery-backup installation. We evaluate the panel, selected loads, equipment, and transfer method before quoting the electrical scope. Call (571) 444-6886 to request an in-home assessment.
| Backup Power Option | Typical Installed Cost | Notes |
|---|---|---|
| Portable generator hookup | $900–$2,500 | Inlet plus listed transfer or interlock equipment; generator separate |
| Battery power station + install | $2,500–$6,000 | Compatible listed portable-unit setup; exact equipment documented in the proposal |
| Whole-home battery integration | $6,000–$15,000+ | Compatible listed whole-home integration; exact equipment documented in the proposal |
What to Confirm in a Quote: Make sure quotes spell out the transfer switch or interlock, the inlet box, any panel modifications, the battery unit and its capacity, and the electrical permit. A clear, itemized quote lets you compare contractors fairly.
Component Cost Breakdown
Portable Generator Hookup
AJL installs the parts that let you safely power your home from a portable generator:
- Complete portable-generator hookup: $900–$2,500 for an inlet plus listed transfer switch or compatible interlock equipment (powers selected circuits and prevents backfeed)
- The portable generator itself: a separate homeowner purchase - choose a portable inverter generator sized to your loads
Battery Power Station
The battery unit is the largest line item, and capacity drives the price:
- Portable-unit setup + install: $2,500–$6,000 for compatible listed equipment and the approved electrical scope
- Whole-home integration: $6,000–$15,000+ for compatible listed equipment and selected-circuit integration
- Expansion batteries: add kWh capacity by stacking additional batteries
- Optional solar input: panels can recharge the battery during an outage (priced separately)
Electrical Work
- Standard transfer-switch or smart-panel wiring: included in the ranges above
- 200-amp panel upgrade if needed: $3,500–$7,500
- Long wire runs or difficult routes: documented in the written proposal rather than published as a separate component band
- Required subpanel work: documented in the written proposal and included in the applicable approved project scope
Factors That Increase Cost
Installation Location
- Distance from the electrical panel (longer wire runs)
- Where the inlet box or battery is mounted
- Difficult access or finished walls
- Number of circuits you want backed up
Electrical System Conditions
- Panel upgrade from 100A to 200A service
- Older wiring requiring updates
- Code compliance corrections
- Whether an interlock kit is compatible with your panel brand
Battery Capacity
- How many kWh of storage you want
- How many circuits the smart home panel manages
- Whether you add solar recharging
- Number of stacked expansion batteries
Permit Scope in Northern Virginia
The property address, AHJ, adopted code, exact equipment, connection method, exterior work, and approved design determine the required permits, reviews, inspections, and current fees. This AJ Long Electric offer includes no permanent fuel-line work. The written proposal identifies known permit responsibility and exclusions; the authority controls classification, review, corrections, fees, inspection, and approval.
Ongoing Operating Costs
Portable Generator
- Gasoline: bought as needed during outages
- Engine maintenance: oil changes, fuel stabilizer, occasional service
- No standing fuel cost when not in use
Battery Power Station
- Recharge cost: grid-energy cost or compatible onsite solar input; solar equipment, installation, maintenance, and conversion losses still carry costs
- Maintenance: charging-state, storage-temperature, firmware, inspection, connection, ventilation, transfer-equipment, test, and capacity requirements follow the exact manuals and installed design
- Battery service life: cycle life, capacity retention, warranty, operating limits, and replacement criteria are model- and use-specific
Financing Options
Many homeowners spread the cost of a larger battery integration. Common options:
- Home equity line of credit: often lowest rates, interest may be tax-deductible
- Contractor financing: many offer 12-60 month plans
- Personal loans: available through banks and credit unions
- Federal tax credit: Section 25D ended for new expenditures after December 31, 2025. See IRS guidance; AJ Long Electric does not provide tax advice.
Is Backup Power Worth It?
Consider these factors when evaluating value:
- Avoided losses: spoiled food, hotel stays, sump pump failure damage, frozen pipes
- Peace of mind: especially valuable for those with medical needs or home-based businesses
- Work from home: critical for remote workers who can't afford outages
- Property decisions: document permits, equipment ownership, warranties, maintenance records, and transfer terms without assuming a resale result
Getting an Accurate Quote
For the most accurate pricing, schedule a free on-site estimate. It includes:
- Complete electrical load analysis
- Recommendation on transfer switch, interlock, inlet box, or battery integration
- Battery capacity sizing in kWh for your essential circuits
- Permit requirement review
- Detailed written quote with no hidden costs
Contact us today to request a project-specific backup power proposal after the on-site estimate. We serve all of Northern Virginia including Fairfax, Loudoun, Arlington, and Prince William counties.
