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Hybrid Inverter Sizing
Recommend hybrid inverter for PV + battery + backup.
ElectricalCore inputs only — quick sizing with engineering defaults.
Inputs (SI units)
Results
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Engineering Formula
- P_inv ≥ max(PV/1.2, Load, Battery-C-rate)
- Battery C-rate (0.5C) = Bat × 0.5
Hybrid inverter must simultaneously feed backup loads AND absorb PV/charge battery. Sized to the largest of the three streams.
Step-by-step Calculation
- 1.PV limit
PV/1.25 kW - 2.Load
Load4 kW - 3.Battery C/2
Bat×0.55 kW
Design Assumptions
- • Single-inverter topology.
- • 0.5C battery charge/discharge.
Engineering Tips
- ◆Choose inverter with ≥ 2 MPPTs for split-roof arrays.
Warnings
- ▲Some hybrids limit backup power to 70% of AC rating — check spec.
Standards & References
IEC 62109-2IEEE 1547.1
Related Solar Calculators
Inverter Sizing
Recommend inverter AC rating from PV DC and DC/AC ratio.
DC Cable Sizing
Copper/Aluminium cable size from voltage drop and thermal derating.
Voltage Drop Check
Voltage drop and % for a chosen cable size.
PV String Sizing
Min/max modules per string against inverter MPPT and DC voltage.
Fuse & Breaker Sizing
Overcurrent protection per NEC / IEC.
Conduit Fill
Conduit size for cable bundle at 40% fill.