Solar Battery Sizer - professional NEC calculator for electricians. Offline, permit-ready.

Solar Battery Sizer helps solar energy professionals design battery banks for off-grid and hybrid PV systems per NEC Article 706.

Features

• Daily energy consumption (kWh) and days of autonomy
• Multiple battery chemistries: LFP, lead-acid AGM, lead-acid flooded, NMC
• System voltage selection: 12V, 24V, 48V
• Depth of discharge (DoD) per chemistry defaults
• Round-trip efficiency factor
• Temperature derating factor
• Required capacity in kWh and Ah
• Number of batteries and total system cost estimation
• Usable energy after DoD and efficiency losses

Standards

• NEC Article 706 (Energy Storage Systems)
• Industry-standard chemistry defaults

For

Solar installers, off-grid system designers, electrical contractors, EPC engineers, students preparing for NABCEP exam.

Optional Pro Upgrade - $2.99 one-time in-app purchase

Pro unlocks history of saved calculations, dark mode, PDF export, and removes ads. One-time purchase.

OPTIONAL PRO UPGRADE - $2.99 ONE-TIME IN-APP PURCHASE The following features require a separate one-time in-app purchase. They are not required to use the calculator:

• Unlimited saved calculation history
• PDF export of results
• Dark theme
• Ad-free experience