Free Tool
Generator Sizing Calculator
Find the right standby generator or battery backup system for your home. Answer questions about your appliances and get matched to products we carry.
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Home
Power
HVAC
Kitchen
Water
Other
Runtime
Results
What type of home or property are you powering?
This shapes which appliances and loads we include.
Primary Home
Year-round residence
Cabin / Seasonal
Part-time or vacation property
Off-Grid Home
No utility connection
Tiny Home / RV
Under 500 sq ft or mobile
Step 1 of 8
What type of backup power do you prefer?
Both options have tradeoffs. We will match you to the best products for your preference.
Battery / Silent
No fuel needed, zero noise, instant switchover
Fuel-Powered
Runs indefinitely on gas, propane, or natural gas
No Preference
Show me both options
Step 2 of 8
Heating, Cooling & Climate
Check everything you need to keep running. Quantities default to 1 — adjust if you have more than one unit.
Step 3 of 8
Kitchen Appliances
Check what you want to keep running during an outage.
Step 4 of 8
Water, Safety & Medical
Include sump pumps, well pumps, and any medical devices that must stay on.
Step 5 of 8
Lighting, Electronics & Other
Include workshop equipment, EV charging, or anything else drawing power.
Step 6 of 8
How long do outages typically last in your area?
This determines how much battery capacity you need — or whether a fuel generator is a better fit.
A few hours
Under 8 hours — most weather events
1-2 days
Typical storm outages
3-7 days
Major weather events
Indefinite
Frequent or unpredictable outages, off-grid
Step 7 of 8
Your recommendation is ready.
Enter your name and email to see your matched products and sizing summary. No spam — just your result.