Home Energy Tools
Free calculators that work without an account. Each one shows its assumptions and lets you change them.
Build My Power Plan
Start here if you are not sure which tool you need. A guided questionnaire that pulls all of them together into one recommendation for your home.
Open the planner →Outage Simulator
Switch appliances on and off and watch the runtime change.
Open tool →Battery Size Calculator
How many kWh, how many units, and how much output you need.
Open tool →Generator vs Battery
An even-handed comparison for the outage you actually expect.
Open tool →Solar Size Calculator
Array size, panel count, roof area and a realistic payback.
Open tool →Solar Quote Checker
Price per watt, production claims, sizing and financing, checked against your home.
Open tool →Coming soon
Not available yet. Tap "I want this tool" on the ones you would use: it is anonymous, needs no email, and tells us what to build next.
Add a Battery to Existing Solar
Likely retrofit approaches for the inverter you already have, and what to confirm with an installer.
Panel Readiness
A screening check for whether new loads are likely to fit your electrical service.
HVAC Power Calculator
Running power, starting power and daily energy for your heating and cooling.
EV Impact Calculator
What an electric vehicle adds to your bill, your solar size and your panel.