About HomeGridHQ

Our methodology

Specs database

Every figure comes from manufacturer spec sheets and product manuals — never third-party listicles. Each record carries a last-verified date, and we re-verify whenever a model is revised. When a manufacturer publishes conflicting numbers (it happens more than you'd think), we use the conservative one and note it.

Calculator & runtime math

Appliance wattages come from manufacturer ratings and DOE typical-use data. Every runtime we publish uses the same formula: rated Wh × 85% inverter efficiency ÷ (watts × duty cycle), with a 20% sizing headroom on recommendations. Duty cycles are shown on every wattage guide so you can check our work.

Incentive tracker

Program amounts and — critically — funding status are checked against official program administrators monthly. A program that's technically "active" but waitlisted is reported as waitlisted. Every state page cites its sources.

Rankings

Best-of picks are computed: we filter the database against a use case's surge, voltage, and runtime requirements, then rank by performance per dollar. Commission rates are never an input. Every product page includes cons, because everything has them.

How we make money

Some outbound retailer links are affiliate links — if you buy through them we may earn a commission at no cost to you. Two hard rules: rankings are computed from specs before monetization is ever attached, and we link to the best source for you even when it pays us nothing (state programs, utility rebates, and manufacturer support pages, for instance).

Corrections

Found a spec we got wrong? We want to know — the database is only useful if it's right. Every page shows its verification date so you can judge freshness.