Best SunStem alternatives: apps like SunStem: Solar Calculator

Watt: Solar for Van & RV

Battery, panels, wire & fuse

Free

This app assists with solar system design for off-grid living and vehicle conversions. It calculates required battery banks, solar panels, controllers, inverters, and wiring sizes based on your appliances and gear. Offers cited sources and brand recommendations for components.

BaseCalc Electric Calculator

NEC Calculator Tools

Free

This app provides electricians with essential calculation tools for job-site field math, including voltage drop, wire sizing, and conduit fill. It offers a comprehensive suite of 18 calculators, saves calculation history, and allows for the creation and export of job worksheets.

GridMind Power

Solar & Battery Intelligence

Free

Gain full insight and control over your home's energy system, including solar panels, battery storage, and EV charging. Monitor real-time power flow, optimize battery usage for peak rates, and track financial gains and solar production forecasts.

Battery Calculator & Converter

Useful tools for batteries.

Free

This app simplifies battery planning and comparison by calculating runtime, capacity, and energy needs. It converts between various battery metrics and offers tools for project design, troubleshooting, and power exploration.