Path-Q Solar
How should battery power output be matched to simultaneous appliance loads?
Answer
Match the battery inverter's continuous output to the maximum combination of loads expected to run at the same time, then separately check short-duration starting or surge power. The design should also account for inverter efficiency, battery temperature, state of charge, and whether all loads or only selected backup circuits are supported.
Key points
- Battery energy capacity, measured in kWh, is different from instantaneous power capability, measured in kW.
- Continuous loads include equipment expected to operate for sustained periods.
- Motor and compressor loads may require substantially more power during startup.
- Load management or staggered starts can reduce the required inverter size.
What it depends on
- Running wattage of each appliance
- Startup or surge requirements
- Which appliances may operate simultaneously
- Battery inverter continuous and peak ratings
- Battery output limits at relevant temperature and state of charge
Risks and trade-offs
- Oversizing raises cost and may leave the system inefficiently loaded.
- Undersizing can cause trips, failed starts, or loss of backup power.
- Nameplate ratings may not reflect actual operating or startup demand.
Information you may need
- Appliance nameplate data and motor types
- Desired simultaneous-load scenarios
- Battery and inverter output specifications
- Whether load shedding or scheduling is acceptable
Your next step
What to do next
Create a simultaneous-load schedule with running and startup demand, then compare it with the inverter's derated continuous and surge capability.
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SQ01886