# SolarBatteryBankCalc.com

> Free, brand-agnostic, browser-based calculator that sizes a complete off-grid or backup solar system: battery bank, solar array, charge controller and inverter, from a real daily load. No signup, nothing stored.

## Key facts
- Sizes per battery chemistry (LiFePO4, Li-ion, AGM, gel, flooded) with correct usable depth-of-discharge and round-trip efficiency.
- Applies temperature derating and inverter efficiency; supports 12V / 24V / 48V systems.
- All math is client-side; constants and formulas are documented at /methodology/.

## Pages
- Calculator: https://solarbatterybankcalc.com/
- Methodology & sources: https://solarbatterybankcalc.com/methodology/
- Use cases: https://solarbatterybankcalc.com/use-cases/
- All tools: https://solarbatterybankcalc.com/tools/
- Run-time guides: https://solarbatterybankcalc.com/run-time/
- Guides (chemistry, sizing mistakes, datasheets): https://solarbatterybankcalc.com/guides/
- FAQ (181 answered questions): https://solarbatterybankcalc.com/faq/
- Glossary (200 defined terms): https://solarbatterybankcalc.com/glossary/
- Embeddable calculators: https://solarbatterybankcalc.com/widgets/
- Site search: https://solarbatterybankcalc.com/search/
- Full reference for AI: https://solarbatterybankcalc.com/llms-full.txt