Solar · Repair, replace or choose · Updated November 2026
Solar Batteries vs. a Standby Generator for Power Outages
Both can keep the lights on during an outage, but they work very differently. A battery stores a fixed amount of energy and can recharge from solar panels. A standby generator burns natural gas or propane and runs as long as fuel lasts.
Side by side
| Solar battery | Standby generator | |
|---|---|---|
| Typical installed cost | About $10,000 average for a battery system; $400–$750 per kWh of storage | Standby units $5,000–$25,000 with installation; a 20–24 kW unit runs $5,000–$6,500 before installation |
| How long it lasts in an outage | Limited by stored energy; recharges from solar when the sun is out | As long as fuel is available |
| What it can power | Limited by battery size and inverter output; often essential circuits rather than the whole house | Sized to run essential loads or the whole house, including central AC |
| Noise and emissions | Silent; no exhaust | Engine noise; exhaust must vent safely outdoors |
| Upkeep | Little routine maintenance; capacity declines slowly over time | Annual service about $170–$400; periodic self-tests |
| Everyday value | Can store solar for evening use, which can help with time-of-use rates | Only used in outages |
Costs from HomeAdvisor's solar battery and generator cost guides.
Which fits your situation
- Battery: you have or are adding solar, outages are usually short, you want quiet operation, or your utility has time-of-use rates.
- Generator: outages last days, you need to run central AC, well pumps or medical equipment for long periods, and you have natural gas or room for a propane tank.
- Both: some homes pair a battery for short outages with a generator for long ones.
Installation items to plan for
- A transfer switch for a generator ($600–$2,500 automatic) and a concrete pad.
- Permits, typically $50–$200 each for electrical and gas work.
- Gas line or propane tank installation.
- For batteries: a backup-capable inverter or gateway, and possibly an electrical panel upgrade (panel replacement cost).
Safety first
Generators produce carbon monoxide. Standby units must be installed outdoors with the manufacturer's clearances, and portable generators should never run in a garage or near windows.
Sources
- HomeAdvisor: Solar battery storage cost, accessed November 2026
- HomeAdvisor: Whole-house generator cost, accessed November 2026
Cost figures are national ranges from the sources listed above and in our solar cost guide, not a quote from FixFinch or any contractor.