To determine the size of the generator you need to run a 4-ton air conditioning (AC) unit, we'll first need to understand the power requirements of the AC unit and then choose a generator that can handle that load.
Find the power requirements of the 4-ton AC unit: The cooling capacity of an AC unit is typically measured in tons, which is a unit of heat transfer. One ton of cooling is equivalent to 12,000 British Thermal Units (BTUs) per hour. So, a 4-ton AC unit would be 4 x 12,000 BTUs per hour, which is 48,000 BTUs per hour.
Convert BTUs to kilowatts: To convert BTUs per hour to kilowatts, we can use the following conversion factor: 1 kW = 3412 BTU/hr.
48,000 BTU/hr ÷ 3412 BTU/hr per kW ≈ 14.06 kW
So, the AC unit requires approximately 14.06 kilowatts to run.
- Consider the starting surge: When an AC unit starts, it requires a higher surge of power to get the compressor running. This surge is typically around 3 to 5 times the running wattage. Therefore, you need to account for this surge to ensure the generator can handle the initial power demand.
Let's assume a surge multiplier of 4:
14.06 kW (running wattage) x 4 (surge multiplier) ≈ 56.24 kW
You'll need a generator with a capacity of around 56.24 kilowatts to handle the starting surge of the 4-ton AC unit.
Please note that generator sizes are typically available in standard ratings, so you'll need to find a generator that is closest to the required capacity. It's also essential to consult the specific power requirements of your AC unit and generator manufacturer's specifications for a more accurate match.