Solar pump inverters are specialized power electronic devices that convert the direct current (DC) generated by photovoltaic (PV) panels into alternating current (AC) suitable for driving water pumps. They form the intelligent core of solar water pumping systems, enabling efficient and reliable water supply in remote, off-grid, and agricultural settings. By dynamically adapting to fluctuating solar irradiance, these inverters ensure that pumps operate optimally from sunrise to sunset, eliminating the need for grid electricity or diesel fuel.

The Leonics Solar Pump Inverter Apollo SPN-216T is a compact and efficient power conversion unit designed specifically for solar-powered water pumping systems. Manufactured by Leonics, a company based in Thailand with over two decades of experience in power electronics and renewable energy, the Apollo series represents a mature and reliable solution for agricultural, residential, and remote water supply applications. The SPN-216T model is particularly suited for small-to-medium-scale pumping tasks, delivering robust performance while maintaining the simplicity required for installations in off-grid or grid-tied environments.

Higher Efficiency: Higher DC voltage reduces current for the same power, resulting in lower resistive losses in cables. This allows for longer distances between the PV array and the pump, which is crucial in large agricultural settings.
Cost-Effective Cabling: With lower current, thinner and less expensive copper cables can be used, reducing overall installation cost, especially for distributed pumping infrastructures.
Scalability: 220V DC systems can handle moderate to high power outputs (up to several kilowatts) without requiring parallel low-voltage strings, simplifying design and maintenance.
Battery-Less Operation: Most modern 220V DC solar inverters are designed for direct drive, storing water in tanks instead of using batteries. This lowers capital and operating costs and reduces environmental impact.
Reliability: With fewer components, solid-state protection, and no electrolytic batteries, the system offers high reliability and long service life, typically 10-15 years with minimal maintenance.
Intelligent Features: Advanced units feature remote monitoring via RS485 or Wi-Fi, allowing users to track performance, diagnose faults, and manage water resources efficientl

Pump type and motor power: The inverter's rated output power must match the pump's motor size, allowing for starting current and thermal conditions.
MPPT voltage range: The PV array configuration must produce a DC voltage that remains within the inverter's MPPT window under all operating temperatures. For a 220V DC system, the MPPT range is typically 150V to 380V.
Input voltage range: The inverter must tolerate the maximum open-circuit voltage of the PV array on cold sunny days, which can be higher than nominal.
Output voltage and frequency: Confirm whether the pump requires three-phase (380V) or single-phase (220V) output. Many 220V DC inverters output three-phase AC, which is common for solar pumps.
Environmental protection: The inverter housing should have an IP rating (e.g., IP65) suitable for outdoor installation, protecting against dust and water ingress.
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Agriculture: Irrigation of crops, vineyards, and orchards. The direct relationship between sunshine and water demand makes solar pumping ideal for daytime irrigation.
Livestock watering: Providing drinking water for cattle, sheep, and other animals in remote pastures.
Domestic water supply: Supplying homes and small communities with clean water from boreholes or wells.
Fountain and pond management: Powering decorative or aeration pumps in gardens and aquaculture.
Water transfer and drainage: Moving water between reservoirs, canals, or cisterns for land managemen

Despite their advantages, solar pump inverters face challenges. The initial capital cost is higher than diesel pump sets, although the total cost of ownership is lower. The output depends on weather, so without a backup generator or hybrid inverter, pumping ceases during prolonged cloudy periods. Another issue is that pump motors, especially centrifugal pumps, can operate inefficiently when driven far from their design point. A poorly matched inverter-pump combination may lead to cavitation or overspeed. Therefore, correct sizing is essential. The system designer must calculate the total dynamic head, flow rate, and daily water requirement, then select a PV array and inverter combination that can deliver adequate power under the site's solar insolation profile.

The Apollo SPN-216T is part of a broader product family that includes other models with varying power ratings, allowing the same technology to be scaled up or down. Leonics has positioned this series as a cost-effective alternative to imported inverters, with the advantage of regional manufacturing and technical support. While specific specifications may vary slightly between production runs and firmware revisions, the core strengths of the SPN-216T remain its reliability, MPPT efficiency, integrated protections, and ease of use.