About WattWise Guide
We build simple tools that help you buy the right size of portable power station or solar generator: not the biggest, not the most hyped, just the one that fits what you'll actually run.
What we do
WattWise Guide is a small independent publisher focused on one question: how much battery do you need? Our calculator turns your devices, hours and recharge plan into a capacity (Wh) and output (W) target, and our guides explain the math in plain English.
How we research
- Specs from the source. We take capacity, output, solar input, chemistry and warranty from each manufacturer's product page and record the date we checked. If a spec isn't published, we say so instead of filling the gap.
- No fake testing claims. We have not lab-tested the products listed. Where we offer judgment ("watch out for…"), it's based on the published specs and on how batteries, inverters and appliances behave, which we explain in our sizing method.
- Conservative math. The calculator assumes 85% usable AC energy and a 20% safety margin by default, and treats "lifting power" modes as unsuitable for starting motors.
- Current shortlist. Our first comparison covers BLUETTI's lineup, which spans every size class we cover and publishes most of the specs we need. BLUETTI is an affiliate partner. We'll add other brands as we verify their specs, and our sizing advice applies to any brand.
- Updates. We re-check specs and prices regularly, and always before major sale events. Each page shows when it was last updated.
How we make money
When you click a "Check price" link and buy, we may earn a commission from the retailer through an affiliate network, at no extra cost to you. That pays for the site. Commissions don't change the calculator's output, and we don't accept payment for placement or positive coverage. Read the full affiliate disclosure.
Corrections and contact
Spotted a wrong spec or a broken link? Please tell us. We fix confirmed errors promptly and update the page date.