How many solar panels do I need for an inverter?

Panel count comes from the required PV-array power and panel wattage—not inverter kW alone.

First estimate the PV array needed to supply the site's daily energy. Then divide the target array watts by the selected module watts for an initial panel count. Finally, design the strings within the inverter's maximum DC voltage, MPPT voltage range, input-current limit and permitted PV-array power.

A 5 kW inverter does not automatically require exactly 5 kWp of panels. The appropriate array depends on daily energy, local solar resource, daytime loads, battery charging, seasonal conditions and the exact inverter's DC-input limits.

Estimate array power from daily kWh and usable solar hours.

A planning formula is PV array kWp = daily energy kWh ÷ (peak sun hours × total system yield). Total yield is an assumption covering temperature, orientation, shading, wiring, conversion and charging losses; it should be based on the actual site and design stage.

Illustration only: 20 kWh per day with 5 peak sun hours and an assumed 80% total yield gives 20 ÷ (5 × 0.80) = 5 kWp. Additional capacity may be needed for poor-season production, battery recovery, daytime growth or limited operating windows.

Convert target kWp into an initial module quantity.

With a 550 W module, divide the target array watts by 550. The nearest practical panel quantity must still satisfy the desired array power, available area and valid string configuration. The examples below show arithmetic only and do not prescribe a final design.

Check voltage and current before confirming the panel quantity.

Use the module open-circuit voltage and temperature coefficient to calculate the highest cold-condition string voltage. Use operating voltage to keep the string inside the applicable MPPT window, and confirm short-circuit and operating current against each input's limits.

Permitted PV power and AC output are separate specifications.

Some inverters permit a PV-array rating above their rated AC output so the system can produce more energy during lower-irradiance periods. That does not increase the inverter's rated AC output, and no universal oversizing ratio should be assumed.

For example, SAVYEN's public SUN three-phase series data lists maximum DC input power by model and separate AC output ratings. Use the exact model's current datasheet rather than applying a percentage copied from another inverter.

Provide module, inverter and site data for the final design.

Send the destination, daily and seasonal energy demand, roof or ground area, orientation, shading, selected module datasheet, inverter model, battery charging objective, cable distance, temperature range and local electrical requirements.

Product data and related evidence.

Use these public sources to verify the model facts used in this guide. Final order specifications still require written confirmation.