Dry-Run and Underload Logic
The controller can detect underload, issue an A-LL alarm and stop or sleep according to the configured delay and reset settings. Commissioning should verify the threshold against the actual pump load.
Solar Water Pump Control
Solar Pump Inverters for Irrigation, Wells and Remote Water Supply
UFELE solar pump inverters use solar energy to run an AC pump for agricultural irrigation, wells, livestock watering, reservoir filling, and off-grid water supply. Each solar pump system can be matched with an indoor IP20 model, an outdoor IP65 model, a compact drive, or a control-panel optimized series.
The first selection check should start from the pump. Pump power, voltage, phase, water head, flow demand, and solar panel input decide which inverter configuration fits the project. For replacement projects, a clear pump nameplate photo and old control cabinet photo can shorten the model review.
Power range: 0.75–630 kW
MPPT control, DC/AC input options, AC pump support, and IP20/IP65 enclosure choices for different solar water pumping projects.
0.75–630 kW
Available Power Range
Available Power Range
MPPT
Solar Energy Tracking
Solar Energy Tracking
DC + AC
Hybrid Input Options
Hybrid Input Options
IP20 / IP65
Indoor and Outdoor Series
Indoor and Outdoor Series
Technical review: UsFull Electric Co., Ltd., founded in 2005, operates the UFELE Electric brand from Wenzhou, Zhejiang, China. The UFELE electrical product team reviewed this page on against the current FU9000SI manual and available model records. The company has supplied electrical products to buyers in more than 90 countries and regions. Buyers should still confirm the current datasheet, certificate and order-specific warranty before approval.
2026 Technical Data
FU9000SI Input, Output and MPPT Voltage Configuration
The electrical suffix matters more than the front-panel style. The values below come from the December 2025 FU9000SI user manual currently published by USFULL. Always match the suffix on the ordered nameplate and confirm the latest file before installation.
| Electrical suffix | AC input | AC output | Maximum DC | Start-up / lowest working | Recommended DC / MPP reference |
|---|---|---|---|---|---|
| -SS2 | 1-phase, 220–264 V | 1-phase, 220–240 V | 450 V | 200 V / 150 V | 200–450 V / 330 V |
| -S2 | 1-phase, 220–264 V | 3-phase, 220–240 V | 450 V | 200 V / 150 V | 200–450 V / 330 V |
| -4 / -9 | 3-phase, 380–484 V | 3-phase, 380–480 V | 800 V | 300 V / 250 V | 300–750 V / 550 V |
MPPT: USFULL publishes efficiency of up to 99%. The manual sets model-dependent MPPT ceilings of 400 V for low-voltage suffixes and 800 V for -4/-9 models, with a default 750 V maximum reference for the high-voltage group. “Up to 99%” is a product claim, not a guaranteed daily system efficiency.
Motor Matching
Selected FU9000SI Power and Current Ratings
Use rated output current—not motor kW alone—when checking pump compatibility. The table shows commonly requested sizes from the 2026 manual; the downloadable manual continues the high-voltage range through 630 kW.
| Model | Output power | Rated input current | Rated output current |
|---|---|---|---|
| FU9000SI-0R7G-SS2 | 0.75 kW | 13.5 A | 7.2 A |
| FU9000SI-1R5G-SS2 | 1.5 kW | 18 A | 10.2 A |
| FU9000SI-2R2G-SS2 | 2.2 kW | 26 A | 14 A |
| FU9000SI-004G-SS2 | 4 kW | 42 A | 23 A |
| FU9000SI-004G-9 | 4 kW | 16 A | 9.5 A |
| FU9000SI-5R5G-9 | 5.5 kW | 27 A | 14 A |
| FU9000SI-7R5G-9 | 7.5 kW | 32 A | 18.5 A |
| FU9000SI-011G-9 | 11 kW | 38 A | 25 A |
| FU9000SI-015G-9 | 15 kW | 45 A | 32 A |
Controls and Protection
Functions Used in an Automatic Solar Pump System
Full- and Empty-Water Inputs
S2 is assigned to the high-water switch and S3 to the low-water switch by default. Full-water and empty-water delays prevent immediate cycling when a contact changes state.
RS485 / Modbus RTU
The manual specifies a two-wire, half-duplex RS485 physical layer using Modbus RTU. Baud rate, address and data settings must match across all devices on the network.
VFD Control Parameters
The keypad exposes frequency, acceleration/deceleration, motor, protection, PV/MPPT and communication groups. Parameters should be changed from the manual for the exact suffix—not copied from another site.
Solar and AC Source Selection
P15.32 supports automatic selection, forced mains input or forced PV input. External switching and anti-reverse arrangements must follow the wiring instructions and project design.
Warranty and Compliance Status
USFULL publishes a 1–3 year warranty period, but the applicable term depends on the product and order agreement. The available FU9000SI CE attestation expired on 29 July 2026; request a current certificate before using it for compliance work.
Product Value
Problems a Solar Pump Inverter Can Solve
Solar pump inverters are normally selected when water pumping needs to reduce dependence on diesel generators, unstable grid power, or long-distance electrical infrastructure. Unlike general solar inverters used for building loads, a solar pump inverter produces controlled frequency and voltage for driving water pumps while adjusting speed according to available sunlight.
MPPT Solar Control
An MPPT inverter follows the available solar energy during the day to optimize power use. When sunlight changes, the controller adjusts pump speed and power output instead of treating the PV array as a fixed power source.
DC and AC Input Support
Solar DC input is used for daytime pumping. Grid power or a generator can serve as a backup power supply when the project needs operation during weak sunlight, cloudy weather, or periods of higher water demand.
Automatic Operation
Automatic start-stop logic and protection functions respond to changing solar conditions. A float switch or water level sensor can stop the pump when a tank is full and restart operation when the water level falls.
Model Series
Solar Pump Inverter Series
These model series are separated by enclosure, installation style, control interface, and common project use. Final selection still depends on pump data, voltage, phase, solar input, and site condition.
FU9000SI-Classic
Standard baseline series for general water pumping applications. Suitable when the buyer needs a stable core solar pumping control platform for indoor installation or cabinet use.
- Power range: 0.75–200 kW
- Standard solar pump inverter series
- For common irrigation and water supply projects
FU9000SI-H IP65
Outdoor protection series with an IP65 enclosure. This series is suitable when the inverter will be installed closer to the pumping site and cabinet-free outdoor installation is preferred. IP65 does not remove the need to review direct sun, heat, cable entry and service access in the site installation details.
- Power range: 0.75–110 kW
- Protection level: IP65
- For outdoor pumping environments
Electrical configuration
FU9000SI manual (PDF)
FU9000SI-V3
Compact series for buyers who need a smaller footprint or cost-sensitive installation. It is often discussed for irrigation, general water supply, and cabinet installations with limited space.
- Power range: 0.75–630 kW
- Compact installation design
- For irrigation and water supply projects
Power and current table
FU9000SI manual (PDF)
FU9000SI-A3
Interface-optimized series with an updated control panel. It is useful where daily operation, parameter setting, and local user handling need to be more convenient.
- Power range: 0.75–110 kW
- Optimized control panel
- For community or routine water supply use
Control and protection
FU9000SI manual (PDF)
Model Comparison
Compare Solar Pump Inverter Series
Use this table for early series comparison. Before confirming a quotation, send the pump nameplate and site details so the recommended model can be checked.
| Parameter | FU9000SI-Classic | FU9000SI-H | FU9000SI-V3 | FU9000SI-A3 |
|---|---|---|---|---|
| Power Range | 0.75–200 kW | 0.75–110 kW | 0.75–630 kW | 0.75–110 kW |
| Protection Level | IP20 | IP65 | IP20 | IP20 |
| Installation | Indoor / cabinet | Outdoor | Indoor / cabinet | Indoor / cabinet |
| Typical Application | Borehole / deep well pumps | Outdoor pumping sites | Irrigation / water supply | Community water supply |
| Main Buying Reason | General baseline selection | Outdoor enclosure protection | Compact installation and broad range | Daily operation and panel convenience |
Model ranges can change by production version and market file. Ask for the current datasheet before final order approval.
Published Project Evidence
Solar Pumping Projects with Recorded System Details
These references come from previously published USFULL project records. Customer names, exact sites and private drawings are not disclosed; the country, application and recorded equipment details remain available for technical comparison.
2.2 kW Irrigation System — Sri Lanka
The recorded project used an FU9000SI-2.2KW-SS2 solar pump inverter for agricultural irrigation and reported water delivery of up to 100,000 liters per day under the documented site conditions.
37 kW Hilltop Irrigation — Mexico
The published configuration paired a 37 kW / 40 HP, 380 V solar pump inverter with a 30 kW submersible pump and a six-string PV combiner box.
Archived FU9000SI CE Record
This attestation lists six FU9000SI-SS2 models and references EN 62109-1, EN 62109-2 and EMC standards. It was issued on 29 July 2021 and expired on 29 July 2026, so it is shown as historical evidence—not as a current compliance claim.
How It Works
How Solar Pump Inverters Convert Solar Panels into AC Power
In a solar pump system, PV modules provide DC electricity. The inverter uses MPPT control to optimize power capture, then converts energy from solar panels into AC power for the motor. In practical terms, these units invert solar DC into variable-frequency AC, allowing a correctly matched AC pump to operate without batteries during suitable sunlight.
Solar power generation changes with irradiance, module temperature, shading, and time of day. The inverter regulates frequency and power output so pump operation follows the available input. This affects achievable flow rates: weaker sunlight normally means lower motor speed and reduced water flow rather than a fixed full-speed output.
External controls can manage unattended water supply. A low-water probe can stop the pump to protect a borehole, while a tank float switch can stop filling at the high water level. Hybrid models can transfer to an approved AC power supply when grid power or generator backup is part of the design.
- MPPT control adjusts operation based on solar panel output
- Automatic start and stop according to solar conditions
- Protection functions for electrical and operating conditions
- External control options such as float switch and water level sensor
- Solar DC input with AC backup discussion when required
Product Video
FU9000SI Display Board and Control Panel Overview
This USFULL product video shows the solar pump inverter display board and front-panel controls. Use it as an interface overview; parameter values still need to follow the exact model manual, motor nameplate and pumping duty.
- Float-switch connection tutorial
- FU9000SI DC MCB connection tutorial
- View the video library
Applications
Common Solar Pumping Applications
Solar pump inverters are used wherever water pumping needs a more independent power source. They can be cost effective where extending grid power or operating diesel generators is expensive, but selection still depends on water head, required flow rates, pump type, solar resource, and backup-power needs.
Agricultural Irrigation
Used for farmland water supply where daytime pumping, seasonal operation, and reduced diesel use matter.
Deep Well Water Supply
Suitable for groundwater extraction in remote sites where head, pump voltage, and stable operation need careful review.
Livestock Watering
Used in farms and grazing areas where storage tanks can balance water supply through daytime pumping.
Reservoir and Tank Filling
Useful for moving water into storage during sunlight hours so water can be used later when pumping stops.
Check the Pump Duty Before Choosing an Inverter
A solar water pump inverter cannot be selected by motor kW alone. The pump voltage, phase and rated current, required head and flow, and available PV array data determine the inverter rating and solar input range.
Solar Pump Sizing Guide
Supply Support
Documents, Packing and OEM Discussion
Solar pump inverter buyers may need more than a unit price. Distributor orders, pump company programs, and OEM supply plans often need catalogs, datasheets, manuals, product photos, packing details, and label discussion.
Datasheets and Manuals
Ask for current datasheets and manuals after the suitable product series is clear. Documents should match the exact model and product version being discussed.
Export Packing
Packing should be confirmed by order type. Distributor orders, project batches, and mixed shipments may need different carton marks and photo checks.
OEM / Private Label
OEM support can be reviewed by quantity, label position, logo file, carton mark, manual request, and target market before production.
FAQ
Solar Pump Inverter Questions
These questions are common before buyers request a solar pumping quotation.
What details are needed to choose a solar pump inverter?
Send pump power, voltage, phase, rated current if available, water head, flow demand, solar panel plan, site country, quantity, and whether the pump is new or already installed.
Can a solar pump inverter work without batteries?
Many solar pumping systems run directly from solar panels during the day without batteries. The final configuration depends on pump demand, sunlight conditions, and whether backup power is required.
What is the difference between IP20 and IP65 solar pump inverter series?
IP20 series are normally used indoors or inside cabinets. IP65 series are designed for outdoor installation where better enclosure protection is needed.
Can the inverter work with submersible and surface pumps?
Solar pump inverters are commonly discussed for AC submersible pumps and surface pumps. The pump voltage, phase, and power should be checked before model selection.
Can UFELE support OEM solar pump inverter orders?
OEM support can be discussed according to model series, quantity, label position, carton mark, manual request, and target market. OEM details should be confirmed before production.
Send Pump Data for Solar Pump Inverter Selection
Attach the pump nameplate, water head, flow demand, PV panel plan, site country, quantity, and packing request. UFELE will review the suitable product series before preparing quotation details.