Product Overview
SD-4 Solar Direct Aerator
The SD-4 Solar Direct Aerator is a professional-grade, off-grid solar pond and lake aeration system designed for larger ponds, remote properties, and demanding water-quality applications where utility power is not practical.
Designed for ponds and lakes up to 5 acres, the SD-4 delivers high-volume subsurface aeration using solar power directly from the PV array. There are no batteries to maintain, no monthly electric bill, no trenching to bring AC power to the pond, and no need to place electrical service at the shoreline. The system converts solar energy directly into three-phase power to run dual brushless rocking piston compressors during daylight hours.
For landowners, farms, HOAs, parks, camps, golf courses, recreational lakes, and remote water-management sites, the SD-4 provides a practical way to improve dissolved oxygen, reduce stagnation, support healthier fish populations, reduce muck accumulation, and improve overall water clarity. It is built for sites where conventional electric aeration is expensive, difficult, or impossible to install.
Solar Direct Efficiency Without Battery Complexity
The SD-Series Solar Direct platform is designed around a simple principle: use the sun to power aeration directly instead of storing solar energy in batteries first. Eliminating batteries reduces cost, simplifies installation, improves system efficiency, and removes one of the highest-maintenance parts of many solar aeration systems.
The SD-4 is engineered to run in changing sunlight. Its high-efficiency solar conversion platform allows the system to start in low-light conditions and continue operating through cloudy or adverse weather. The result is longer daily run time, lower maintenance, and dependable solar-powered pond aeration without utility power.
Dual Compressor Output for Larger Waterbodies
The SD-4 uses dual 3-phase brushless rocking piston compressors for strong, efficient airflow. Brushless compressor technology eliminates the brushes used in conventional permanent-magnet DC motors, improving service life and reducing wear. With 5.6 SCFM of airflow and a rated operating depth of 2 to 40 feet, the SD-4 is built for larger ponds and higher-demand applications.
Professional-Grade Components
The system is built around a rugged, powder-coated, all-welded steel enclosure, stainless steel hardware, active compressor cooling, individual circuit protection, replaceable intake filter/silencers, full-flow brass ball valves, and USSM DB-36 stainless steel diffusers. The solar racking is made from anodized aluminum extrusion, laser-cut welded steel components, and stainless steel hardware for long-term outdoor use.
The SD-4 kit includes:
- Complete dual compressor and control system
- Two USA-made mono-crystalline solar modules
- Adjustable top-of-pole solar mounting system
- Pole-mount enclosure with mounting hardware
- Four DB-36 stainless steel diffusers
- Two 300-foot reels of 3/8-inch self-weighted airline
- PV cables and PV combiner
- Easy-to-follow installation instructions
- US-based technical support
- Factory warranty coverage
The customer supplies a 3-inch Schedule 40 or Schedule 80 steel mounting pole with a 3.5-inch outside diameter. Do not use plastic pipe or tubing for the solar mounting pole.
Need help choosing the right system? US Solar Mounts provides in-house, US-based product selection, system design, and technical support. If you are unsure whether the SD-4 is the right system for your pond, contact us before ordering.
SD-4 Solar Direct Aerator Specs
System Capacity
- Recommended coverage: Up to 5 acres
- System type: Solar Direct subsurface pond and lake aerator
- Power source: Solar-direct PV operation, no batteries required
- Solar modules: Two USA-made mono-crystalline solar modules
- Rated operating depth: 2 to 40 feet water depth
- Applications: Ponds, lakes, livestock watering, fish farms, open water for wildlife, storm water, golf courses, parks, marinas, irrigation, and other remote water-quality applications
Compressor & Air Output
- Compressor type: Dual 3-phase brushless rocking piston compressors
- Air flow: 5.6 SCFM
- Air output at pressure: 5.6 CFM at 10 PSI
- Air intake: Dual intake filter/silencers with replaceable filter cartridges
- Over-pressure protection: Brass automatic pressure relief valve
- Flow balancing: Four full-flow brass ball valves
- Hose connections: Four 3/8-inch brass barbs
Solar Racking
- Mount type: Fully adjustable top-of-pole solar mounting system
- Aluminum: 6061-T6 anodized aluminum extrusion
- Steel parts: Laser-cut and welded steel
- Hardware: Stainless steel
- Pole size: 3-inch Schedule 40 or Schedule 80 steel pole, installer supplied
- Required pole outside diameter: 3.5 inches
- Tilt range: Adjustable tilt, 0 to 60 degrees
- Wind load rating: 90 MPH
Enclosure & Mechanical
- Enclosure material: All-welded, laser-cut steel
- Finish: Baked-on polyester powder coat
- Hardware: Stainless steel
- Enclosure rating: NEMA 4/3R
- Enclosure dimensions: 15.5 in. W x 18 in. H x 11.3 in. D
- Enclosure weight: 37 lb
- Locking cabinet hardware: Included
- Insulation: Optional
Thermal Management & Protection
- Compressor cooling: 150 CFM auto-active ventilation
- High-temperature protection: Yes, with automatic restart
- Circuit protection: Individual thermal-magnetic circuit breakers for solar input and compressors
- Enclosure ventilation: Ultra high-flow cooling and ventilation
Diffusers & Airline
- Diffusers included: Four DB-36 stainless steel diffusers
- Diffuser construction: Laser-cut stainless steel base using high-efficiency Aero-Tube
- Weighted airline included: Two 300-foot reels of 3/8-inch self-weighted airline
- Diffuser compatibility: Works with USSM DB-36 diffusers and other diffuser styles when properly configured
Warranty & Support
- Electronics warranty: 1 year
- Compressor warranty: 3 years
- Non-wearable parts warranty: 5 years
- Solar panel warranty: 20 years
- Technical support: US-based and in-house
- Country of origin: USA
Installation Note: The customer supplies the 3-inch Schedule 40 or Schedule 80 steel mounting pole. Do not use plastic pipe or tubing for the solar mounting pole. Proper site selection, pole installation, solar array orientation, diffuser placement, and airline routing are important for best performance.
