Powered by point zero energy

This calculator will calculate the minimum amount of solar and the minimum battery size you need to run the appliances you wish to run on solar.

To use this calculator, simply fill out the appliances you wish to run, and click the "Calculate" button at the bottom. Use the advanced options to get more precise results.

Advanced options

System specifications:

Select the nearest city to you

Inverter Idle power consumption in watts?
Watts		5-10 watts - high efficent small solar generators 15-25 watts - high efficient larger generators 15-25 watts - low efficientcy small solar generators 30-100 watts - low efficinecy larger solar generators small solar generators < 1500 watts

Inverter efficiency?
%		90% - high efficiency inverters 85% - Most inverters 75% - Low efficiency inverters

Batteries Maximum Depth of Discharge (DOD)
%		100% - True Deep cycle batteries 80-90% - Most lithium batteries 50% - Most Deep cycle batteries 10% - Non Deep cycle batteries

Charge controller type?

Number of days of backup power without sun (recommended 2 to 5 days if power is critical)?
Number of days To fully charge a completely empty battery bank?

Power Usage:

Will you use a 18 cu ft high efficeincy refrigerator?

Will you use a high efficiency mini fridge?

Will you use a freezer

The number of hours lights will be in use per day

The total amount of watts of light that will be in use

Dishwasher loads per week

Washing maching loads per week

Hot water gallons per day

well pump gallons per day

Will you run a gas furnace?

Will you run a cpap maching?

Will you run an oxygen concentrator

Computer: hours per day

TV: Hours per day (LED)

Oven: hours per day

Cooktop burner: hours per day

Crock pot: meals per week

Microwave: hours per day

Box Fan or pedistal fan hours per day

Window AC unit hours per day

Other: Watt hours per day

Minimum battery size in watt hours

Minimum Solar panel size in watts

Appliance	Watts	Appliance	Watts	Appliance	Watts
Oven	3,000 Watts	LED TV	100 Watts	Well Pump 1/3HP	750 Watts
Refrigerator** 18 cu.ft.	1,200 Watt-hours/day	LED Monitor	80-100 Watts	Well Pump 1/2HP	1,000 Watts
Freezer** 15 cu.ft. (chest)	1,080 Watt-hours/day	Desktop computer	80-120 Watts	Sump Pump 1/3HP	800 Watts
Dishwasher	1200-1,500 Watts	Desktop computer (Gaming)	400-1,000+ Watts	Sump Pump 1/2HP	1,000 Watts
Electric Clothes Dryer	3,400 Watts	Laptop computer	40-120 Watts	Drill	250-1,000 Watts
Gas Clothes Dryer	300-400 Watts	Clock Radio	7 Watts	9" Disk sander	1,200 Watts
Washing Machine	500-1,000 Watts	Plasma TV	350 Watts	3" Belt sander	1,000 Watts
Microwave	1,500 Watts	LED TV	100 Watts	12" Chain saw	1,100 Watts
Toaster oven	1,200 Watts	ipad/Tablet	10-20 Watts	14" Band saw	1,100 Watts
Hot Plate	1,500 Watts	Satellite dish	30 Watts	Circular saw	1,500 Watts
Electric Skillet	1,500 Watts	Cell Phone charger	2-10 Watts	Jig Saw	300-700 Watts
Toaster	1,100 Watts	Radiotelephone - Transmit	40-150 Watts	Chop / Cut Off Saw	1,500 Watts
Coffee Machine	1,500 Watts	Radiotelephone-Receive	5 Watts	210 Mig Welder	6,500 Watts
Blender	300-1,500 Watts	100 watt incadescent bulb	100 Watts	Air compressor 1HP	2,000 Watts
Vacuum Cleaner	500 Watts	60 watt incadescent bulb	60 Watts	Central Air Conditioner	1,000-5,000 Watts
Dehumidifier	500 Watts	25 watt compact fluoresent bulb	28 Watts	Room Air conditioner	900-1,200 Watts
Humidifier	300-1,000 Watts	20 watt DC compact fluor.	22 Watts	Furnace Blower	300-1,000 Watts
Portable Fan	50-100 Watts	CFL Bulb (60-watt equivalent)	18 Watts	Portable Heater	1,500 Watts
Ceiling Fan	100 Watts	LED Bulb (60-watt equivalent)	10 Watts	Stock Tank Heater	100 Watts
Curling Iron	90 Watts	Electric blanket	50-150 Watts	Garage door opener	350 Watts
Hair Dryer	1,500 Watts	Portable water heater	500 Watts	Shop Vac 6.5 hp	1,500 Watts