30A Charge Controller
Below estimateListed controller current rating (30 A) is below the 42 A estimate.
View product specifications →Charge Controller Size Calculator
Charge controllers must handle the current your array can deliver at the system voltage you are charging. This calculator uses array wattage divided by system voltage with a safety multiplier — a simplified planning method, not a substitute for manufacturer MPPT/PWM sizing charts.
Your inputs
Calculation breakdown
Estimated charge controller current
42 A
- Solar array nameplate power
- 400 W
- System voltage
- 12 V
- Safety factor
- 1.25×
- Estimated controller current
- 42 A
Common planning multiplier for controller oversizing.
⌈(400 W ÷ 12 V) × 1.25⌉
Catalog products near this estimate
Controller recommendations use published amp ratings from active catalog products. Verify MPPT voltage limits and lithium charging profiles on merchant listings before purchase.