DC to AC Load Converter

A DC watts to AC watts calculator for solar inverter sizing with real efficiency factors built in. Use the free DC to AC Load Converter below — enter your values and get instant results, right in your browser. AC watts = DC watts × inverter efficiency (0.85–0.97 for modern inverters). VA = watts ÷ power factor (0.8 typical for homes). So 3,000 DC watts through a 90% efficient inverter deliver 2,700 AC watts, and a 2,700W home load needs a 3,375 VA inverter.

How to use the DC to AC Load Converter

Solar panels produce DC, your home uses AC, and the inverter between them is not 100% efficient — so 1,000 DC watts never become 1,000 AC watts. This DC watts to AC watts calculator for solar inverter sizing converts between DC watts, AC watts at typical inverter efficiencies, and VA, so you can translate panel output into the usable power your appliances actually get. Use it when matching panel arrays to inverter ratings or checking whether a quoted system really covers your load.

  1. Type the wattage in the amount box — for example the DC rating of your panel array.
  2. Choose the unit you are starting from in the From dropdown (usually DC watts).
  3. Choose the target unit in the To dropdown, e.g. AC watts at 85% inverter efficiency.
  4. Read the converted value live in the result line — no button needed.
  5. Use the swap button (⇄) to convert back, e.g. from an AC load to the DC watts the panels must supply.

Formula

AC watts = DC watts × inverter efficiency (0.85–0.97 for modern inverters). VA = watts ÷ power factor (0.8 typical for homes). So 3,000 DC watts through a 90% efficient inverter deliver 2,700 AC watts, and a 2,700W home load needs a 3,375 VA inverter.

Worked example

A 5,000W DC panel array feeding a 90% efficient hybrid inverter delivers 5000 × 0.90 = 4,500 AC watts to the home. If your appliances draw 4,000 AC watts, the panels must supply 4000 ÷ 0.90 = 4,444 DC watts. In VA terms at 0.8 power factor, that 4,000W load needs a 5,000 VA (5 kVA) inverter.

Frequently asked questions

Multiply by inverter efficiency: 1,000 DC watts × 0.90 = 900 AC watts for a typical modern inverter, or 850 AC watts for an older 85% efficient unit.

Watts are real usable power; VA (volt-amps) is apparent power. With a 0.8 power factor, 1,000 VA delivers 800 watts. Inverters are rated in VA/kVA, so always convert your watt load up before buying.

Modern hybrid inverters are 93–97% efficient; budget or older UPS-style inverters are 85–90%. Use 90% for planning unless your datasheet states otherwise.

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