Free load calculator
Solar sizing calculator
Turn daily equipment use into an indicative PV array and panel count.
Plan before you choose
What does your
power plan need?
Build a load list. Explore generator capacity, solar energy and hybrid backup with assumptions you can change.
Choose a user type, then add equipment.
User type
Saved in this tab. Restart to clear.
Adjust or type
0.51
One shared planning factor; confirm actual load data.Adjust or type
0100
Editable planning allowance.Adjust or type
18
Illustrative input, not a measured city forecast.Adjust or type
40100
Accounts broadly for losses; not a PVWatts simulation.Adjust or type
1001000
Change to the module you are comparing.Adjust or type
024
Adjust or type
10100
Use the selected battery’s permitted operating range.Adjust or type
50100
Editable combined discharge-path assumption.See formulas and assumptions
- Connected kW = sum of quantity × running watts ÷ 1,000.
- Daily kWh = sum of connected kW per row × daily hours.
- Extra starting kW = largest row’s connected kW × (starting multiplier − 1). Only the largest row starts while others run.
- Generator screening kVA = (connected kW + extra starting kW) ÷ assumed power factor × (1 + headroom).
- Solar kWp = daily kWh ÷ (peak sun hours × total yield factor). Panel count is rounded up.
- Hybrid continuous inverter target = connected kW × (1 + headroom). Starting peak is checked separately against the inverter’s surge duration.
- Nominal battery kWh = connected kW × backup hours ÷ (usable share × battery-to-AC efficiency).
Generator estimates do not model starting power factor or voltage dip. Solar estimates do not model roof geometry or weather. Hybrid results do not establish compatibility, safe integration or recharge availability. LYTH NCM modules need a designed battery system; this calculator does not select a module configuration.
Technical background: Cummins application manual · PVWatts for site-specific solar modelling
