Battery Size Calculator
Use the battery size calculator if you do not know how many kWh you need.
Open CalculatorFind Your System
Not sure which battery system you need? Start here.
Choose the tool first. Do not buy by kWh alone.
Use the battery size calculator if you do not know how many kWh you need.
Open CalculatorUse the backup runtime calculator if you want to know how long a battery can run your loads.
Open ToolUse choose battery by use if you know the job, but not the system.
Open ToolUse choose battery by capacity to compare 5kWh, 10kWh, 20kWh, 50kWh, and larger systems.
Open ToolUse battery compatibility check before ordering if you already have solar panels, an inverter, or batteries.
Open ToolUse this when battery, inverter, solar charging, backup output, and expansion must work together.
Build SystemPrepare these before using a home battery sizing calculator or asking for system matching.
| What to Prepare | Why It Matters |
|---|---|
| Load List | Shows what the battery must support |
| Backup Time | Decides the required kWh |
| Inverter Model | Confirms voltage and communication |
| Solar Information | Checks solar charging and backup use |
| Installation Site | Confirms wall, rack, cabinet, indoor, or outdoor setup |
| Expansion Plan | Avoids choosing a system that cannot grow |
Match your situation to the right selector before comparing products.
| Your Situation | Use This |
|---|---|
| I do not know battery size | Battery Size Calculator |
| I want to know backup time | Backup Runtime Calculator |
| I know the application | Choose by Use |
| I want to compare kWh sizes | Choose by Capacity |
| I already have inverter or solar | Check Compatibility |
| I need the full setup matched | Build a Complete System |
Choose the tool first. Do not buy by kWh alone.
After you pick a tool path, review systems that fit the same use case.
See how battery systems are installed, tested, expanded, and commissioned.
Placement, wiring, inverter connection, and startup.
Real loads running from battery power.
Solar panels charging the battery.
Extra battery modules added for longer runtime.
Battery, inverter, solar input, backup output, and monitoring.
Start with the battery size calculator. Use your real load list and backup time.
Use the backup runtime calculator. Enter battery size and load power.
Use battery compatibility check. Confirm inverter model, battery voltage, communication, backup output, and wiring.
Buy battery only if your inverter is compatible. Choose a complete battery system if battery, inverter, solar charging, and backup output must be matched together.
Yes, if the battery model, BMS, inverter, wiring, and installation space support expansion. Confirm this before installation.