Free Solar & Battery Calculators – Plan Your Off-Grid System
Use our free, easy-to-use solar and battery sizing tools to plan your home energy system. Whether you’re going off-grid, adding battery backup, or sizing solar panels for your roof, these calculators give you instant, accurate estimates — no signup required.
Battery Bank Calculator
Calculate the exact battery bank size you need for your solar or backup power system. Enter your daily energy usage, backup days, and battery voltage to get instant results in amp-hours (Ah) and kilowatt-hours (kWh). Perfect for RVs, cabins, off-grid homes, and emergency backup planning.
Try the Battery Bank Calculator →Solar Panel Sizing Calculator
Find out exactly how many solar panels you need based on your electricity usage, location sunlight hours, and panel wattage. Get accurate panel count and total system size (kW) estimates in seconds — ideal for homeowners, RV owners, and solar installers planning a new system.
Try the Solar Panel Calculator →Why Use Shalkot’s Free Solar Tools?
- 100% free, no signup or email required
- Instant, accurate results based on real solar math
- Designed for US homeowners, RVers, and DIY solar enthusiasts
- Mobile-friendly and easy to use on any device
More free solar and energy calculators coming soon. Bookmark this page to stay updated.