DC Power vs AC Power

My DC freezer uses between 60 and 110 watts. It can run on a single 120 watt solar panel. Better though with a battery and charge controller.
Microsoft Word - dcrf450 spec sheet.doc (sundanzer.com)

A watt is a watt regardless of the power supply voltage. When looking at the power requirement of appliances, it is easier to compare the current required to run them, which varies greatly depending on power supply voltage. See example below:

There is a formula for power: P = I * V
In this formula, P is power, measured in watts, I is the current, measured in amperes, and V is the potential difference (or voltage drop) across the component, measured in volts.​A lot of times this is also displayed as W = V * A or watts equals volts multiplied by amps.

Lets re-order this formula for an example:

• W = V * A
• V = W / A
• A = W / V

Lets say you have 1000 watts of loads to run. This is equal to:

• 83.3 amps at 12 volts
• 41.6 amps at 24 volts
• 20.8 amps at 48 volts
• 8.3 amps at 120 volts
• 4.1 amps at 240 volts