DC Power Calculator
Convert between Watts, Amps, and Volts.
DC Power Calculator
Convert between Watts, Amps, and Volts
Formula
P = V × IHow to Use
- 1Enter any two values — Input any two of Watts, Amps, or Volts.
- 2Get the third value — The calculator computes the missing value using P = V × A.
- 3Use for planning — Apply results to wire sizing, fuse selection, and circuit design.
Frequently Asked Questions
What is the formula for DC power?
Power (Watts) = Voltage (Volts) × Current (Amps). This is the fundamental relationship: P = V × I.
How many amps does a 100W solar panel produce?
At 12V nominal: about 8.3A (100W ÷ 12V). At 24V: about 4.2A. Actual output varies with conditions.
Why is DC voltage important for solar?
Solar panels, batteries, and charge controllers work with DC voltage. Knowing exact current draw helps size wires and fuses safely.