Observed arrival · 2026-10-31
Size Your Power makes off-grid sizing show its work
A collection of free calculators for sizing solar panels, batteries, inverters, wires, fuses and backup power systems.
- For
- Van, RV, cabin and off-grid power planners
- Worth noticing
- The RV load tool compares appliance use against a 30- or 50-amp breaker and identifies what to switch off.
Field notes
The calculator list spans more than solar-array sizing: it includes generator fuel for a 24-hour run, alternator charging time, battery lifetime cost per kilowatt-hour and solar pumping based on water use and well depth. Several descriptions call out operating conditions or constraints, including cold-weather losses and the choice between MPPT and PWM controllers. The homepage says formulas, worked examples and assumptions accompany results; the supplied evidence does not independently verify individual calculations.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
One card from the complete issue