SI21-D5-R75G-A Veichi SI21-D5 Solar Pump Inverter | 0.75 kW (3-phase/380V-460VAC)

Veichi SI21-D5-R75G-A — off-grid solar pump inverter of the SI21 range with 0.75 kW capacity for three-phase 380V pump motors. The slimmest unit in the family, designed for small-scale domestic automated watering.

Typical Applications:

• Private garden irrigation from shallow wells
• Filling dynamic elevated water storage tanks
• Automated circulation in small garden pools

Pay attention: features an IP20 rating requiring secondary enclosure mounting. The drive is fully compatible with dynamic permanent magnet synchronous motors (PMSM).

Veichi SI21 Solar Pump Inverters — Compact and Economic Solutions for Off-Grid Pumping

The Veichi SI21 solar pump inverter series is engineered specifically to create highly efficient, budget-friendly off-grid water supply and agricultural drip irrigation systems powered by solar PV panels. This ultra-compact controller is designed to drive three-phase asynchronous (AM) and high-efficiency permanent magnet synchronous motors (PMSM) from 0.75 to 30 kW. Featuring a built-in high-precision MPPT tracker with up to 99.8% efficiency, the SI21 dynamically maximizes solar power extraction. DIN-rail compatibility and book-style side-by-side mounting significantly reduce electrical enclosure space requirements. The inverter features intelligent automated protection routines: upon dropping PV levels, the drive triggers a low PV voltage sleep mode (parameter F14.11) displaying warning A.LPn, and auto-wakes when voltage reaches threshold F14.12.

Typical Applications for Veichi SI21

• Greenhouse Drip Irrigation: Delivers fully automatic water dosing directly correlated with solar radiation levels, eliminating manual operational labor.
• Small Farms and Livestock Pumping: Ideal for pumping borehole water into elevated storage tanks for gravity-fed field irrigation or automated cattle watering.
• Domestic Water Supply in Remote Areas: Stabilizes line pressure in off-grid cabins, summer houses, or mountain stations without grid utility power connections.

What Differentiates Veichi SI21 from Competitors

A key engineering highlight of the SI21 range is its cost-to-performance ratio, offering standard permanent magnet synchronous motor (PMSM) compatibility, which enhances overall hydraulic solar system efficiency compared to legacy induction pump sets.

When Veichi SI21 is NOT Suitable

• If your B2B project demands direct outdoor installation without a protective steel control cabinet — choose the heavy-duty Veichi SI30 (IP65) range.
• For large-scale agricultural operations requiring advanced AC/DC hybrid automatic mixing with multiple dynamic expansion cards — select the flagship Veichi SI23 series.

Our Engineering Integration Experience

The Veichi SI21 series represents our top-recommended choice for small-to-medium off-grid private wells. The integrated potentiometer dial on the front keypad allows fast manual frequency limits commissioning without browsing complex parameter structures. The drive possesses a built-in sensorless dry run prevention algorithm (parameters F14.17-F14.19) — if the operating current falls below the programmed limit, it blocks the motor with diagnostic code A.LuT, shielding internal bearings. We recommend installing an output reactor if your submersible pump cable length exceeds 30 meters.