Solar Pump Inverter Drive (MPN: BLX-SPI-3100) is an industrial-duty component engineered for continuous factory operations, piping systems, and machinery maintenance in Kenya. Key verified ratings include Rated Motor Output Power: 5.5 kW (7.5 HP) / Full Load 13.0 A @ 380-415V, Rated Output Voltage: 3-Phase 380V / 415V AC (0 to 50/60 Hz), Maximum DC Input Voltage (Voc): 800 V DC (Cold open-circuit maximum). Standard plant applications include Off-grid solar agricultural irrigation and drip farming systems in arid/semi-arid Kenya, Community borehole drinking water supply and solar water kiosks, Livestock watering points, ranches, and game conservancies. Supplied through our STARNEX Nairobi sourcing desk with prompt lead times across Kenya and East Africa. When requesting a quotation, please specify required quantity, operating voltage/phase, pipe connection size, and delivery destination.
Solar Pump Inverter Drive
Solar Pump Inverter Drive (MPN: BLX-SPI-3100) is an industrial-duty component engineered for continuous factory operations, piping systems, and machinery maintenance in Kenya. Key verified ratings include Rated Motor Output Power: 5.5 kW (7.5 HP) / Full Load 13.0 A @ 380-415V, Rated Output Voltage: 3-Phase 380V / 415V AC (0 to 50/60 Hz), Maximum DC Input Voltage (Voc): 800 V DC (Cold open-circuit maximum). Standard plant applications include Off-grid solar agricultural irrigation and drip farming systems in arid/semi-arid Kenya, Community borehole drinking water supply and solar water kiosks, Livestock watering points, ranches, and game conservancies. Supplied through our STARNEX Nairobi sourcing desk with prompt lead times across Kenya and East Africa. When requesting a quotation, please specify required quantity, operating voltage/phase, pipe connection size, and delivery destination.
Functional engineering application
The BLX-SPI-3100 Solar Pump Inverter Drive converts DC solar photovoltaic power directly into variable-frequency 3-phase AC power to run submersible borehole pumps and surface irrigation pumps across rural and off-grid Kenya. Equipped with a dynamic Maximum Power Point Tracking (MPPT) algorithm boasting over 99% efficiency, the inverter continuously adjusts motor speed to extract the maximum possible electrical power from the solar PV array as sunlight varies from morning to late afternoon. The inverter features automated autonomous control: it wakes up at sunrise, adjusts pumping speed to solar irradiance, and sleeps at dusk. Built-in dry-run protection algorithms detect when a borehole water table drops, preventing catastrophic motor burnout without requiring downhole sensor cables.
Advanced 5.5 kW (7.5 HP) 380V/415V 3-phase solar water pump inverter with 99% MPPT efficiency, 250-800VDC input, dry-run protection, dual AC/DC switching, and LED keypad.
Quotation & fulfilment
Parametric technical attributes
| Generic BLX-SPI-3100 | |
| IDENTIFICATION | |
| Component Type | Solar Pump Inverter Drive |
| Manufacturer / Brand | Generic |
| Part Number (MPN) | BLX-SPI-3100 |
| Stock Keeping Unit (SKU) | STX-BLX-BLXSPI3100 |
| PERFORMANCE & RATINGS | |
| Rated Motor Output Power | 5.5 kW (7.5 HP) / Full Load 13.0 A @ 380-415V |
| Rated Output Voltage | 3-Phase 380V / 415V AC (0 to 50/60 Hz) |
| Maximum DC Input Voltage (Voc) | 800 V DC (Cold open-circuit maximum) |
| Tank Full Overflow Control | Float switch digital input for automatic high-level shutoff |
| Operating Ambient Temp | -10°C to +50°C (Derate above 40°C) |
| TECHNICAL PARAMETERS | |
| Recommended MPPT DC Range | 450 V to 650 V DC (Optimal Vmp 540V DC) |
| MPPT Tracking Efficiency | ≥ 99.0% |
| Alternative AC Input | 3-Phase 380V / 415V AC (50/60 Hz) Generator or Grid |
| Motor Control Method | Space Vector PWM (SVPWM) with soft acceleration ramp |
| Dry-Run Protection | Sensorless underload detection + optional well probe inputs |
| Cooling System | Forced air cooling with high-CFM DC fan and finned aluminum heatsink |
| Enclosure Rating | IP20 (Standard wall mount) / IP54 outdoor cabinet options |
| COMPLIANCE & LOGISTICS | |
| Stock Availability | On request |
System fitment & verified replacements
Interchangeable models
- Veichi SI23
- INVT BPD
- Grundfos RSI
Commonly installed on equipment from
Common questions on this part
For optimal performance, size the solar PV array 25% to 30% above the pump rating (approx. 7.2 kWp of panels). Typically, 14 to 16 modern 550W mono-perc panels connected in a single series string provide the ideal Vmp of ~560V DC.
No. The BLX-SPI-3100 is a direct-drive solar pump inverter that operates battery-free, converting solar DC power directly into variable AC power for the pump motor, eliminating expensive battery replacement costs.
When the pump runs out of water, motor electrical load current drops sharply. The inverter detects this underload condition, immediately stops the motor, and displays a dry-run fault before restarting automatically after a user-configured recharge timer (e.g. 30 minutes).
Yes. The inverter supports dual AC/DC inputs, allowing an external manual or automatic changeover switch to feed power from a backup generator during overcast days or nighttime emergencies.
STARNEX provides a 12-month warranty with in-house technical setup and parameter programming at our Nairobi center.
