Solar Inverter Sizing Sheet

To Calculate Inverter Sizing

The Inverter changes the DC current stored in the batteries into usable AC current which is the most common type used by most household appliances and lighting. For more information regarding inverters see (Inverter Basics) Fill in and print the DC to AC Inverter sizing work sheet below to determine the correct size Inverter you need.

Sample 120 Volt AC Load Chart

AC Volts to DC Volts Inverter Sizing Sheet
1. Enter the total Watts expected to be used by your AC loads running simultaneously. You most likely will not have all of your appliances and lights running continuously at the same time.
2. Enter Surges required to start electrical motors, if any.
3. Add line 1. and line 2. for total Watts of power needed.
4. Multiply line 3. by 1.2 to account for inverter loss. This is the power rating you need to match with your inverter specifications.
5. If you can afford it you may want to increase the size of your inverter to allow for unanticipated extra electrical loads.

Your next step is to determine the correct wiring size.

Solar Electric Wiring Reference Guide