In Santorini, Greece, a guesthouse operator, Nikolaos P., has long faced a practical challenge: during the peak tourist season, guests tend to run the air conditioning almost all day during their stay in his property.
After analyzing the energy use of his own guesthouse in Greece, Nikolaos P. found that air conditioning was the main source of electricity consumption, especially during the peak summer season when guests keep the AC running for long hours. Since most usage occurs during daytime, it matches well with peak solar production hours.
Choosing a Solar Cooling Solution for Cost Reduction
After facing continued pressure from rising electricity costs, Nikolaos P. began searching for a solution that could reduce his guesthouse operating expenses without compromising guest comfort.
After comparing several options, he ultimately chose the Flowatts 12,000 BTU Hybrid Solar Air Conditioner DC Inverter Split AC Cooling/Heating Fan, which prioritizes solar energy to reduce electricity consumption during peak summer demand.
Installation & System Configuration
In this project, Nikolaos P. installed the Flowatts 12,000 BTU Hybrid Solar Air Conditioner DC Inverter Split AC Cooling/Heating Fan in guest rooms of his Santorini guesthouse, integrating it with the existing rooftop solar PV system.
To ensure stable daytime operation, the system typically requires a 1.5kW–2.5kW solar array. In this case, the installation included approximately 3–5 solar panels of 450W–550W each, with a total capacity of around 1.8kW–2.2kW. This configuration is sufficient to support primary cooling demand during peak sunlight hours in summer.
Key Product Specifications (Flowatts 12,000 BTU)
- Cooling Capacity: 12,000 BTU
- Type: Hybrid Solar Air Conditioner
- Compressor: DC Inverter Technology
- Operation Mode: Solar Priority + Grid Backup
- Functions: Cooling / Heating / Fan
- Power Input: Solar direct drive + automatic grid switching
- Application: Guesthouses, residential homes, vacation rentals, Airbnb properties
Solar Panel Configuration for 12,000 BTU Hybrid System
Nikolaos P. chose the 12,000 BTU Hybrid Solar Air Conditioner, which supports 80–380V DC solar direct input, allowing the system to prioritize solar energy during daytime operation and significantly reduce grid electricity consumption.
In practical system design, it is recommended to install:
3–4 × 550W solar panels (approximately 1.65kW–2.2kW system size)
This configuration is sufficient to cover the primary cooling demand of the air conditioner during summer daytime operation while providing stable input to the MPPT controller, ensuring smooth and reliable compressor performance even under high ambient temperatures.
In high solar irradiance regions in Europe such as Greece and Spain, this solar setup can typically support most daytime operation hours. When solar irradiance is insufficient or during nighttime, the system automatically switches to grid power, enabling a stable hybrid energy operation mode that ensures uninterrupted indoor comfort.
