ETERNAL WATT · SOLAR AIR COOLER SYSTEM

Solar Air Coolers

for Homes — One Panel Is All It Takes

A single solar panel is enough to power your air cooler during the day. The unit runs continuously — solar first, grid backup always on. Low added cost, with electricity savings that pay back in months.

  • Single-panel ready
  • Built-in AC/DC
  • Continuous operation
  • Fast payback
Rooftop solar and grid power coordinating a mobile air cooler with a built-in HS500 in a hot residential courtyard
Built-in HS500 · Integrated design

SOLUTION · SOLAR AIR COOLER

From everyday home use to outages and fully off-grid cooling

For homes, weak-grid regions, and outdoor businesses: the energy enhancer is integrated inside the air cooler, so solar and available grid power connect directly to the unit without a separate external device.

Solid green · Solar direct to air cooler Solid amber · Grid support Broken gray · Grid outage

SINGLE-PANEL · REAL-TIME HYBRID

01

Start with one panel and save with sunlight first

The built-in HS500 provides real-time AC/DC coupling inside the air cooler. The unit uses as much solar as available, and the grid fills only the gap—without a separate external energy enhancer.

A single balcony solar panel drives an air cooler with a built-in HS500 first while the grid supplies only the remaining power

LOW-LIGHT · OUTAGE OPERATION

02

During an outage, operation can continue with solar input as low as 20W

When the grid is down and no storage is installed, solar connects directly to the built-in HS500. Even in low light with solar input as low as 20W, the air cooler can maintain basic operation.

In bright overcast daylight with the grid line disconnected, solar continues driving the air cooler to maintain basic airflow

MOBILE · COMPLETELY OFF-GRID

03

No grid? Bring solar and keep the cool air moving

A portable solar panel directly drives a mobile air cooler with a built-in HS500 at an off-grid outdoor stall

OPERATING MODES · FOLLOW AVAILABLE ENERGY

Grid available, grid down, or fully off-grid—operate on the energy at hand

One control logic adapts to different power environments: save with solar first when the grid is available, preserve basic daytime airflow during outages, and let sunlight determine capacity off-grid.

Grid available

Solar first, grid fills the gap

The unit follows actual demand; the solar share depends on the power available at that moment.

  • For frequent, long-duration use in homes and shops
  • Grid power fills gaps as sunlight changes
  • No need to wait for full solar output
Daytime outage

Maintain airflow in low light and increase with sunlight

Without storage, the unit maintains operation after minimum input is reached, and airflow changes with sunlight.

  • Confirm the as-low-as-20W figure by testing the specific model
  • Low-light operation does not mean full-power airflow
  • No operation at night without sunlight or storage
Fully off-grid

Direct solar power for mobile cooling

Suitable for localized airflow at shaded, ventilated stalls, courtyards, and temporary work sites.

  • No temporary grid connection or long cable run
  • Move the solar panel and air cooler with the application
  • On-site capacity depends on sunlight and system configuration

Perceived evaporative-cooling performance also depends on humidity, ventilation, water supply, and airflow distance.

Discuss your configuration

SOLAR AIR COOLER SYSTEM · LEARN MORE

Explore the complete solar air-cooler solution

Visit the Eternal Watt website to learn more about the solar air-cooler system, evaporative-cooler products, and project support.