THE SHORT ANSWER
Start with what you want to keep running and for how long. Batteries store a limited amount of energy; generators depend on a suitable fuel supply. The complete design matters more than the equipment label.
Define what needs power
Start with actual loads: refrigeration, lighting, internet, a well pump, or air conditioning. Essential circuits and whole-home backup can require very different designs.
Understand the battery limits
A battery has both an energy capacity and an output limit. Runtime depends on your loads and whether compatible solar can recharge it during the outage.
Understand the generator requirements
A generator uses fuel and needs maintenance. Capacity, fuel availability, placement, transfer equipment, and operating requirements belong in the comparison.
Compare the complete installation
Compare equipment plus the electrical work, transfer components, fuel work where applicable, and maintenance requirements. The best fit depends on the home and the outage scenario.
Turn the conversation into a plan
Make two lists: equipment you need during an outage and equipment you can choose to leave off. Then describe a realistic day at home without grid power. A refrigerator that cycles on and off and an air conditioner with a starting surge place different demands on the design. Ask the installer to show which loads can run together. For a battery proposal, ask what happens after stored energy is depleted. For a generator proposal, ask how the planned fuel supply and service routine support the outage duration you have in mind.
Questions for your project
- List essential circuits and larger motor-driven loads.
- Discuss starting demand as well as running demand.
- Ask how the system transitions into backup mode.
- Compare ongoing maintenance and complete installed scope.
Make it specific to your home.
Try an appliance backup scenario →
Write down the appliances you want to run and discuss expected outage duration.