Estimate the inverter size needed for a solar power system, off-grid system, battery backup system, RV solar setup, cabin solar system, or hybrid solar installation. This calculator estimates continuous inverter wattage, surge capacity, inverter kW, solar array ratio, battery current, and recommended inverter size with a safety margin.
Load mode:
The calculator sizes the inverter from continuous load watts, surge load watts, inverter efficiency, power factor, and safety margin.
Solar array mode:
The calculator estimates inverter size from solar array size and DC to AC ratio.
Battery mode:
The calculator estimates inverter output from battery bank size, battery voltage, and maximum discharge rate.
Full estimate mode:
The calculator compares load-based, solar-array-based, and battery-based inverter sizing and recommends a practical inverter size.
A solar inverter size calculator helps estimate the inverter wattage needed to run appliances, support surge loads, match a solar array, and work safely with a battery bank.
It can help compare inverter watts, inverter kW, surge capacity, battery current, AC output current, DC/AC ratio, efficiency losses, and estimated inverter cost.
Your result shows recommended inverter size, inverter kW, surge capacity, load-based inverter size, solar-array inverter size, battery-supported inverter size, DC battery current, AC output current, efficiency loss, and estimated inverter cost.
For off-grid or backup systems, start with the continuous load and add a safety margin. Then check surge loads, battery current, and inverter efficiency. For grid-tied systems, compare inverter AC size with the solar array DC size.
Not always. Grid-tied systems often have a solar array that is larger than inverter AC capacity. Off-grid systems are usually sized around load demand, surge capacity, and battery output.
Using a 1.25 DC to AC ratio, a 6 kW solar array would commonly pair with about a 4.8 kW inverter. The best size depends on system type, location, clipping tolerance, and equipment design.
Some appliances need more power to start than to keep running. Pumps, refrigerators, compressors, power tools, and motors can require a larger inverter surge rating.
No. This is an estimate. Actual inverter sizing can vary based on appliance surge behavior, inverter model, battery voltage, wiring, grid rules, solar array design, temperature, power factor, electrical code, and manufacturer requirements.