Solar Inverter Sizing Calculator
Estimate inverter AC rating from PV array DC kW and a target DC/AC ratio for commercial and industrial planning.
Quick answer
Inverter kW ≈ Array kW ÷ DC/AC ratio. Example: 50 kW DC at ratio 1.2 → ~41.7 kW AC inverter. Hub: Solar calculator.
Quick Solar Inverter Sizing Calculator
Advanced Solar Inverter Sizing Calculator
Inverter Sizing Results
Engineering disclaimer
Planning estimate only. Confirm OEM MPPT windows, clip losses, and interconnection limits. Not a portable inverter shopping tool.
Inverter kW by DC/AC ratio
| DC/AC | Inverter kW |
|---|
People also ask
- How to size PV inverter? Array kW ÷ DC/AC ratio.
- What ratio? Often ~1.1–1.3.
- kVA next? Use kW to kVA with PF.
Planning guidance
- Convert to kVA with kW to kVA.
- Interconnection: transformer sizing for solar.
- Hub: Solar calculator.
Typical scenarios
- Commercial roof: Mild oversizing (1.15–1.25) common.
- Clip-sensitive site: Prefer ~1.1 and verify yield.
- Hybrid: Coordinate with battery inverter ratings separately.
Formula (quick reference)
Inverter kW_AC ≈ Array kW_DC ÷ DC/AC ratio
Inverter kVA ≈ kW_AC ÷ PF
AC interconnection context: transformer sizing for solar systems · commercial solar interconnection requirements. Array method: how to size a commercial solar array.
Frequently Asked Questions
How do I size a solar inverter?
Divide array DC kW by the target DC/AC ratio to estimate inverter AC kW, then convert to kVA if needed.
What is a typical DC/AC ratio?
Many commercial designs use about 1.1–1.3. Higher ratios increase clipping risk—confirm with yield models.
Difference from MPPT charge controller sizing?
MPPT sizing is for DC charge controllers (current/Voc). This tool sizes grid/hybrid inverter AC rating vs array DC.
Is this for portable inverters?
No—commercial/industrial PV planning, not camping kits.
What is the next step?
Convert inverter kW to kVA and review transformer interconnection guidance.
How it works
DC/AC ratio is array DC nameplate divided by inverter AC continuous rating. Solving for inverter kW gives a procurement screen before clip/yield studies.