How many watts of solar panels are needed to run a cooler?
Ceiling fans only circulate air and do not provide real cooling, while coolers and air conditioners actually reduce heat—but with much higher power consumption. A BLDC ceiling fan uses around 30 watts, a normal air cooler consumes 200–300 watts, and a 1-ton inverter AC can use up to 1 kilowatt, making ACs the most expensive to run.
Because of high electricity bills, many people prefer coolers, but long usage can still increase costs. For example, a 300-watt cooler running 20 hours daily can consume about 180 units per month, significantly affecting the bill.
To reduce electricity costs, solar power is becoming popular. While solar coolers are available (with or without battery backup), replacing an existing cooler is not always practical or affordable. The good news is that your existing cooler can run on solar panels.
The calculation is simple:
Check the motor and water pump power rating
Add both values
Multiply by daily usage hours to find daily units consumed
Example:
250W motor + 50W pump = 300W
Used for 10 hours = 3 units/day
A 500-watt cooler used for 10 hours needs about 5 units/day, which can be easily handled by a 1 kW solar system in summer.
Solar output also depends on technology. MPPT controllers/inverters and N-type TOPCon bifacial panels give higher generation—up to 5 units/day, compared to about 4 units with basic technology.
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