Air conditioner on Solar

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  • Post published:May 7, 2019
  • Post category:Blog

Air conditioner on Solar

Flow Climate control systems and Water Radiators are high wattage apparatuses. At the point when a blower of a forced air system is running it needs high current. The following are some agent wattage dependent on the forced air system estimate:

High Wattage and High Initial Current

Air Conditioners and Water Heaters are high wattage appliances. When a compressor of an air conditioner is running it needs high current. Below are some representative wattage based on air conditioner size:


Max Wattage

Max kVA (assuming 0.80 power factor)

1 Ton

1200 Watts or 1.2 kW

1.6 kVA

1.5 Ton

1500 Watts or 1.5 kW

2.5 kVA

2 Ton

2500 Watts or 2.5 kW

3 kVA

The wattage here is instantaneous power demand or the electricity required when all the components of air conditioner are running. But it varies during the running of an air conditioner because the compressor switches off when the temperature of the room reaches the level set in the thermostat. During the time the compressor is switched off, the electricity consumption is only for a few components in the air conditioner, which is much less. Also the initial starting current is high.
Similarly for electric water heaters the wattage requirement is 2-4 kW or 2000-4000 Watts. The high wattage is required only till the water is heated to a certain temperature.
To handle high loads of air conditioners or water heaters the inverters connected to a solar power generation system should be able to handle high load. So one needs about a 3 to 5 kVA inverter system to handle the same. Most commonly used home inverters are low kVA inverters that cannot handle this load. Also one would also want other appliances in a house to be running and not just the air conditioner, so this increases the overall size of the system.

Is PV the best technology for Air Conditioners?

Not really. In our article that we have mentioned above, we have talked about the differences between Solar Thermal and Solar PV technology. Solar PV has a much lesser efficiency as compared to Solar Thermal systems. There are some solar air conditioners available in the market that work on Solar Thermal principles (more about it on our article: Solar air conditioning: using sun’s energy when it most abundent and needed). Although Solar Air Conditioners have some limitations in working during nights, but if reducing electricity bill is your main motive, then Solar Air Conditioners provide much more value for money over using Solar PV for air conditioning. As per information that we have from our research, the air conditioners working on solar thermal principles are comparable to some of the efficient electric air conditioners in the market. Thus from a cost perspective they provide much more value.

Solar Panel Required for 1.5 ton dc inverter air conditioner

We know that we are required minimum 1200 watt to run 1 ton AC and 2200 watt required to run 1.5 ton inverter AC. So we required minimum 2KVA (1400 watt) for 1 ton AC and 3KVA (3000 watt) to run 1.5 ton AC.

How much power do I need to run a 1.5 ton air conditioner?
1.5 Ton air conditioner typically has a design electrical load of 1.3 to 1.5 kW, which means, if the AC runs on full load for 1 hour, it consumes 1.5 kW x 1 hr = 1.5 kWh or 1.5 units. Solar Energy as we all know generates electricity, only during the day and typically for a maximum of 4 to 5 hrs a day. Solar Panel 540 watt at least 5 panels required for 1.5 Ton 
Can I run a 1.5 ton AC on solar without batteries?
An ideal choice/correct size to run a 1.5 ton AC is 1.5 kW (or kva). As when the compressor motor stats, its starting current can go upto the 3 -3.5 times of running load. So, install a direct on-line system with enough capacity to power 1.5 kw. Anything less than it will trouble you no-end.