For many agricultural and residential water projects, the goal isn’t to buy a new pump, but to power an existing one with renewable energy. Converting a single phase pump to solar is a highly cost-effective way to eliminate diesel or grid electricity costs. For B2B retailers and installers, offering conversion kits is a high-demand service that leverages existing infrastructure while introducing high-tech HOBER efficiency.
HOBER’s specialized HSPH-L series is designed specifically for this application. Unlike standard off-grid inverters, these are purpose-built solar pump inverters with advanced motor protection and MPPT algorithms. To find the right match for your existing motor, utilize our HOBER Solar Pump Sizing Tool.
Technical Requirement: The HSPH-L Series
| Step | Exigence | Technical Detail |
|---|---|---|
| Phase Matching | HSPH-L Series | Mandatory for 220V single-phase pumps |
| Inverter Power | >= Pump Power | Recommend 1.1x – 1.2x headroom |
| PV Power | 1.5x Pump Power | Compensates for environmental losses |
| Voltage Target | ~300V Vmp | Typically 7-8 panels (620W) in series |
| Extra Protection | AC Reactor | Recommended if cable length > 100m |
When you are looking at single phase pump to solar conversions, the most critical technical step is selecting the correct inverter phase. Standard pumps are either single-phase (220V/240V) or three-phase (380V+). For a single-phase 220V AC pump, you must use a HOBER HSPH-L inverter.
The HSPH-L series takes DC power from the solar array and converts it into the specific AC waveform required by single-phase motors. This conversion is handled by a built-in variable frequency drive (VFD) that allows the pump to start softly. Soft starting eliminates the massive “inrush current” typical of direct-on-line grid connections, which significantly extends the life of the pump’s motor windings and mechanical seals.
Sizing the Inverter and PV Array
To successfully complete a single phase pump to solar conversion, you must adhere to HOBER’s core sizing principles. The inverter power must be equal to or slightly higher (up to 1.2x) than the pump’s rated power. For example, if you have a 1.5kW single-phase submersible pump, a 2.2kW HSPH-L inverter is the ideal choice to provide sufficient headroom.
- PV Power Ratio: We recommend a solar array power of 1.5x the pump’s wattage. For a 1.5kW pump, aim for 2.25kW of solar panels.
- Voltage Target: For single-phase systems, the target Vmp (Voltage at Maximum Power) is typically around 300V DC. Using 620W panels, this usually means a series string of 7 or 8 panels.
- Cable Considerations: If the pump is located more than 100m from the inverter, an AC reactor should be added to the output to protect the motor.
Always confirm the pump’s capacitor configuration. Some single-phase pumps require the removal of the external capacitor when being integrated with a high-performance solar pump inverter.
Essential Protection: Combiner Boxes and Sensors
UN single phase pump to solar conversion is not just about the inverter and panels; it requires a complete protection suite to ensure long-term ROI. HOBER provides integrated solutions that include all necessary accessories for a professional installation.
Key components for a professional conversion kit include a PV combiner box for lightning protection (SPD) and DC breakers to isolate the array during maintenance. Additionally, HOBER inverters come with ports for water level sensors. Installing these sensors provides dry-run protection, which automatically shuts down the pump if the well’s dynamic water level drops below the intake, preventing terminal motor damage.
Questions fréquemment posées
Do I need to buy a new pump to switch to solar?
No, you can leverage your existing AC pump by adding a HOBER HSPH-L solar pump inverter. This inverter converts DC power from solar panels into the AC waveform required by your current single-phase 220V motor, allowing you to eliminate grid or diesel costs.
What happens to the pump’s start-up capacitor?
High-performance solar pump inverters like the HOBER HSPH-L series feature built-in soft-start technology. In many cases, the external start-up capacitor must be bypassed or removed to allow the inverter’s Variable Frequency Drive (VFD) to control the motor acceleration safely.
How do I protect the system from running dry?
HOBER inverters include dedicated ports for water level sensors. By installing a sensor in the well, the system can automatically detect when the water level drops below the pump intake and shut down the motor to prevent dry-running and terminal damage.
Devenez partenaire du leader d'usine depuis 16 ans
HOBER supports global distributors with 16 years of specialized manufacturing experience. Our 5 automated production lines and ISO9001 quality management ensure that every HOBER solar pump inverter meets international standards for durability and efficiency. We don’t just sell parts; we sell complete system reliability.
- CAD Support: We provide wiring diagrams and mounting designs for conversion projects.
- Entraînement: Detailed manuals and technical support to help your team master single-phase solar integration.
- Hybrid Options: For 24/7 requirements, our onduleur de pompe solaire hybride models can blend solar with grid or generator power.
Ready to upgrade your next irrigation tender?
Contactez le service d'assistance technique de HOBER today to receive our 2026 product catalog and wholesale distributor price list. Let us provide the engineering expertise for your next solar conversion project.
