Solar Charge Controller Calculator
Size the charge controller for your solar array and battery bank.
About the Solar Charge Controller Calculator
If you have ever wanted a fast, reliable Solar Charge Controller Calculator that works on your phone without sign-ups or ads getting in the way, this is it — the figures update the moment you type.
The inverter is the heart of a solar system — it converts DC power from panels and batteries into the AC power your appliances use. This Solar Charge Controller Calculator sizes the inverter from your peak simultaneous load.
The calculation matches the inverter's continuous rating to your running load, with headroom for surge loads like refrigerators and water pumps that draw more at startup.
In Pakistan, hybrid inverters combine solar, battery and grid input, letting the system switch seamlessly between sources. Sizing must consider both the solar array and the loads it powers.
A common mistake is matching the inverter to the solar array only, ignoring the load. If your peak load is 4 kW, a 3 kW inverter will trip regardless of how many panels you install — size from the load.
For the most accurate outcome from the Solar Charge Controller Calculator, keep the editable rates and defaults up to date with current figures before reading the result.
How to size a solar inverter
- 1
Enter your peak simultaneous load in watts or kW.
- 2
Add margin for surge loads from motors and compressors.
- 3
Read the recommended inverter rating, updated live.
Frequently Asked Questions
How do I size a charge controller?
Controller amps = array watts ÷ battery voltage, plus 25% margin. A 3 kW array at 48 V needs a ~78 A controller — round up to 80 A.
How do I choose between a 5 kW and 10 kW inverter?
Match the inverter to your peak load, not the panel count. A home with two ACs needs a 8–10 kW hybrid inverter; one without ACs may manage on 3–5 kW. This calculator sizes from your actual load.