Charts
Solar watts to amps chart for 12V, 24V, and 48V
This table converts DC watts to current at a stated voltage. It does not report a solar panel's Imp or Isc and cannot size a controller, fuse, or cable.
Interactive conversion
Convert watts to amps
Choose DC for the ideal relationship or single-phase AC to include power factor.
Estimated current
Planning estimateEnter power and voltage, then calculate. AC also needs a power factor.
- Mode
- --
- Formula
--- Power factor
- --
Formula: I = P ÷ V I = P ÷ (V × PF)
Scope: Planning estimate for single-phase ideal DC or AC only. It does not include inverter efficiency, surge, three-phase systems, wiring, fuses, breakers, or code requirements. For solar hardware, compare Vmp, Imp, Voc, and Isc on the panel label.
| Power (W) | 12 V (A) | 24 V (A) | 48 V (A) |
|---|---|---|---|
| 50 | 4.17 | 2.08 | 1.04 |
| 100 | 8.33 | 4.17 | 2.08 |
| 150 | 12.5 | 6.25 | 3.13 |
| 200 | 16.67 | 8.33 | 4.17 |
| 250 | 20.83 | 10.42 | 5.21 |
| 300 | 25 | 12.5 | 6.25 |
| 350 | 29.17 | 14.58 | 7.29 |
| 400 | 33.33 | 16.67 | 8.33 |
| 450 | 37.5 | 18.75 | 9.38 |
| 500 | 41.67 | 20.83 | 10.42 |
| 550 | 45.83 | 22.92 | 11.46 |
| 600 | 50 | 25 | 12.5 |
| 800 | 66.67 | 33.33 | 16.67 |
| 1,000 | 83.33 | 41.67 | 20.83 |
Assumptions
Values use I = P ÷ V with exact stated DC voltage and no conversion loss. Use the panel label's Vmp, Imp, Voc, and Isc for equipment checks.
How watts convert to amps
Divide watts by volts. At 400W, ideal current is 33.33A at 12V, 16.67A at 24V, or 8.33A at 48V.
Related calculator
Solar panel output calculator in kWhRelated reference charts
Questions people ask
How many amps is 200W at 12V?
The ideal DC conversion is 16.67A. A real solar panel's operating current depends on its Vmp and conditions.
Can this table size a charge controller?
No. Controller selection also requires array Voc, Isc, temperature limits, configuration, and the manufacturer's rules.