SunRotor SR-5 - 36VDC Helical Rotor Solar Pump (2" Submersible)

The SR-5 is a slim, 2-inch submersible helical-rotor (progressive-cavity) pump engineered for reliable solar water delivery from narrow wells and sand-points where suction pumps can’t reach. Its positive-displacement rotor/stator generates high pressure at low RPM, so it begins producing water early, runs efficiently through low-irradiance hours, and maintains steady flow as total dynamic head increases.

The SR-5’s stainless construction, single moving part, and fully rebuildable design make it a field-serviceable workhorse for ranch tanks, wildlife waterers, off-grid cabins, and remote homesteads. Powered by a matched SunRotor DC controller, it accepts solar, battery, or hybrid input and supports multiple array options, letting you tailor lift/flow for your site while protecting the motor with proper soft start, current limiting, and dry-run safeguards. A

standard 3/4" FNPT outlet, wide input-voltage window, and conservative thermal protection round out a pump built for uptime and low lifetime cost. 

Product Details

• Narrow-casing fit: 2" OD submersible body for small wells where 4" pumps won’t fit. 

• Progressive-cavity hydraulics: High head at low speed for early-morning start and late-day run time on modest PV. 

• Flexible power options: Runs from solar, battery, or both via the SunRotor MRC-M50T DC controller; supports several panel configurations. 

• Real-world performance: Up to ~3.9 GPM at 100 ft TDH with ~202.5 W / 38.2 V PV input (reference curve); max functional lift ~150 ft. 

• Field serviceable: Single moving part, rebuildable rotor/stator; designed for long life and straightforward maintenance.

• Installer friendly: 3/4" FNPT outlet, clear controller pairings, and multiple array recipes (e.g., one 335 W 24 V panel, or two 195 W 24 V in parallel).

Technical Specifications