Battery, UPS & Inverter Calculators: Free Backup Power Tools

Design reliable backup power systems with our free online battery, UPS, and inverter calculators. Whether you need emergency power for a home office, a data center UPS, or an off-grid solar installation, these tools calculate battery amp-hours, inverter wattage, and backup runtime instantly. Enter your load wattage, desired runtime, depth of discharge limit, and system voltage to receive precise battery bank sizing and inverter capacity recommendations. Each calculator includes Peukert's law adjustments for high-rate discharge, inverter efficiency losses, and temperature derating for real-world accuracy. Avoid costly failures from undersized batteries that drain too fast or inverters that overload on startup. Electricians, solar installers, and IT professionals use these tools to ensure uninterrupted power for critical equipment. No signup required—access from any device and complete your backup power design with confidence.