Independent research, updated August 18, 2026. Some product links are affiliate. No test lab. How we work

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Decision tree · not a lab recommendation

Find the backup that matches your loads

Three choices. We route you to a cart-ready product we can actually cite, including cheaper rungs in the same catalogs. Tesla stays in the “wait for an installer” path only.

Companion kit steps after you pick a portable

1. What must stay on?

2. When do you need hardware?

3. Hardware budget (before labor)

Then run the calculator with your actual watts. A well-pump answer is not a guarantee it will start your pump.

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