Solar DC To AC Conversion Calculator

Use our solar DC to AC conversion calculator to convert the DC (direct current) power into usable AC (alternating current) power.

DC To AC Conversion Calculator​

DC Watts (1Wh = 1000 kWh)
Type Inverter Efficiency Rate (e.g 85%. 90%, etc..)

Note: 1000Wh = 1kWh and most inverters are about 90% efficient. But to check the exact value, have a look at the specs of your inverter.


  • There’ll be no power loss in AC wiring (use the chart below to figure out the right size wiring for your inverter).

How To Use This Calculator?

DC watts: These can be the watts produced by your solar panels or the total capacity of your battery in Watt-hours to figure out how much actual power you have stored to run your household appliances.

Inverter Efficiency: Read the product description or specs sheet on your inverter (usually located at the bottom side). it’ll be mentioned as inverter efficiency rate (e.g 90%). Then enter 90 in the calculator.


like I have two 200W portable solar panels which produce about 1500 watts of total power in a day (1500Wh) and I have a 1000 watt pure sine wave inverter (with 90% efficiency rate) to run my AC appliances.

1500 DC watts will be equal to 1350 AC watts when using a pure sine wave inverter (90% efficient).

dC to aC conversion formula

Direct current (DC) is the form of power produced by the solar panels and also batteries are designed to store DC current (12v, 24v, 48v).

But most of our household appliances are designed to be run on Alternating current – AC (120-240V). So there will be a power loss when converting DC into AC with the help of an inverter.

To calculate the DC watts into AC watts use this formula:

Formula: Solar AC Watts = (DC watts × Inverter inverter efficiency rate) ÷ 100

Calculate DC amps into AC amps using this formula:

Formula: Solar AC amps = (DC amps × Inverter inverter efficiency rate) ÷ 100

Video – Inverter Efficiency Explained​​

DC To AC Conversion Loss

When converting DC watts into AC watts there will be a conversion loss of 5-15% because of the inverter efficiency rate.

Internal temperature and standby power consumption of an inverter is the reason for their less efficient rate.

And also using the wrong size wire will cause some power loss because every size wire is designed to handle a limited amount of current.

So make sure to use the correct size wiring between the battery bank to the inverter.

What size of cable should I use with my inverter and battery?
Wire size chart for inverter from battery

Use this chart to select the right size wire from the battery bank for your inverter.

DC To AC conversion - chart

Here’s a chart of DC watts into AC watts conversion with a pure sine wave inverter and modified sine wave inverter.

DC wattsHow many AC watts?
100 watts90 watts
200 watts180 watts
300 watts270 watts
400 watts360 watts
500 watts450 watts
600 watts540 watts
700 watts630 watts
800 watts720 watts
900 watts810 watts
1000 watts900 watts
1500 watts1350 watts
2000 watts1800 watts
2500 watts2250 watts
3000 watts2700 watts
3500 watts3150 watts
4000 watts3600 watts
4500 watts4050 watts
5000 watts4500 watts
5500 watts4950 watts
6000 watts5400 watts
Table: DC Watts To AC Watts

Note: the above table is based on a 90% efficient inverter.

Related Post: How Long To Charge 12v Battery With Solar panel?

How Do I Convert DC Watts To AC Watts?

To calculate DC watts into AC watts multiply the DC watts by the inverter efficiency rate and divide the result by 100. For example, most inverters are 90% efficient. So, (100 DC watts × 90) ÷ 100 = 90 AC watts.

With the help of this simple calculation formula, you can easily calculate the DC watts of your battery bank or solar panels into AC watts.

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I hope this short guide was helpful to you. still, have any confusion? LEAVE A COMMENT or contact us. Thank You!

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Chris Tsitouris is a renewable energy professional with 10+ years of experience as Director of Engineering at Solar Spectrum, previously working as Project Manager at SunPower and Energy Analyst at the National Renewable Energy Laboratory. As a thought leader, Chris has authored numerous articles and research papers.

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