Some of us may wonder why we need to use Solar ventilation fan + Hybrid AC/DC device + Fan controller with temperature? Solar ventilation fan + Hybrid AC/DC device + Fan controller with temperature ?

Working principles of solar roof / wall / ceiling ventilation fans

First of all, we would like to start explaining the working principles of each system.

Solar ventilation fan : Consumes electric power from solar panel only. Thus, the ventilation fan will work only when exposes to sunlight.

Solar ventilation fan+ Hybrid AC/DC device + Temperature Controller : Consumes both electric power from solar panel and the power line.

• With sunlight: Hybrid AC/DC equipment is powered by a solar panel to enable solar ventilation fan to work.
• Less sunlight: Hybrid AC/DC equipment combines electricity from solar panels and power lines to run the solar ventilation fan. 

The fan will stop working only if the temperature of an attic is lower than the temperature set.

Advantages of solar ventilation fan + Hybrid AC/DC Device + Temperature Controller

Since solar cell ventilation fan + Hybrid AC/DC device + temperature controller can reduce the temperature in the house 1-2 degrees Celsius more when compared to the solar ventilation fan that uses only solar panels.

Solar ventilation fan + Hybrid AC/DC device + temperature controller works better because it has a higher average Air Flow Rate making it more efficient when compared to the solar ventilation fan that uses only solar panels.

Electric energy from the power line used in solar ventilation fan for 1 day :

Example case of using solar ventilation fan + Hybrid AC/DC device + ventilation fan controller with temperature (9 hrs/day)
1 day, the motor consumes electricity 25w x 9hours = 225 w-h/d.
1 day, the solar panel can produce 100% electricity (4 hours), 30w solar panel = 30w x 4 hours = 120 w-h/d.
Therefore, 1 day, it consumes electricity from the power line 225 – 120 = 105 w-h/d.
Therefore, 1 day, it consumes electricity from power line amount = 105/1000 = 0.105 unit/d.

The electricity cost from the power line 1 unit (1,000 w-h) = 4 baht/unit.

It is considered a cost-effective use of renewable energy by paying extra 12.6 baht/month can help reduce the temperature by 2 degrees Celsius, resulting in the air conditioner to reduce electricity consumption by about 10-15%.