Observed arrival · 2026-10-21

OffGrid Sizer gathers 25 power calculators

offgridsizer.com Visit website

Editorial interest 78/100 Selection signal · not a rating of the site

A free toolkit for sizing off-grid solar, batteries, wiring, generators, and backup power.

Landing page captured for the 2026-10-21 issue.

For: People sizing power for cabins, vans, and RVs
Worth noticing: The runtime estimates account for battery chemistry, usable depth of discharge, inverter losses, and the Peukert effect.

Field notes

The calculators span from whole-system estimates to component checks, with separate tools for battery-bank wiring, solar string voltage, DC voltage drop, and generator runtime. Some descriptions expose practical assumptions: the controller-sizing tool names a 25% safety margin, while the CPAP estimator distinguishes humidifier use and AC versus DC. The homepage says formulas and assumptions are editable, and that inputs remain in the browser.

Observed signals

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Editorial observations of this landing page, not a rating.

○OpenPublic substance visible

✦PrettyNotable craft visible

●ProPolished or operationally mature

◎NicheUnusually specific use

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