The Ginlong Solis Solis-3P-K-4G series is a three-phase grid-tie inverter designed for operation in PV installations connected to the grid - from single-family homes to small commercial properties. What sets it apart is its 2 MPPT architecture, enabling independent management of two string inputs. This offers a real benefit from different roof orientations, varying string lengths, and partial shading, as each string independently tracks its own maximum power point. In practice, this translates to better energy yield in typical, non-ideal installation conditions.
High European efficiency means the inverter operates effectively not only under laboratory conditions but also in variable loads typical of the Polish climate. You also benefit from robust protection features, integrated grid protection functions, and an enclosure designed for outdoor mounting. Monitoring is done via RS485, and with optional modules, also via WiFi or GPRS - with data viewing in the app. This is the series for those seeking reliable performance, convenient diagnostics, and a long warranty.
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Pros and cons
The 3P-K-4G series utilizes passive natural convection cooling without a fan, which eliminates moving parts that are prone to wear and tear. This directly translates to a longer device lifespan and a lower noise level (<40 dB) compared to inverters with active cooling (e.g., older Huawei SUN2000 models).
Two independent MPPT (Maximum Power Point Tracking) systems with a wide voltage range of 160-850 V allow for the efficient operation of installations with various orientations and lengths of strings, as well as partial shading. The starting voltage of 160 V allows for earlier operation even under low morning sunlight.
With a maximum efficiency of 98.7%, the inverter occupies the upper quartile of the three-phase segment (the market median for the 3-20 kW class is approximately 98.0-98.5%). The low Total Harmonic Distortion (THDi) of less than 1.5% meets the stringent requirements of grid operators, facilitating the connection of the facility.
Ginlong (Solis) Technologies maintains Tier 1 status according to BloombergNEF (verified for Q1 2025), which signifies recognized bankability - a requirement for external financing of PV installations and leasing. The company, established in 2005, is listed on the Shanghai Stock Exchange, further confirming its financial stability.
The IP65 enclosure provides complete protection against dust and water jets, allowing for outdoor mounting without additional covers. The design without a transformer reduces the device's weight and improves energy efficiency compared to inverters with galvanic isolation transformers.
In standard, the manufacturer offers a 5-year factory warranty - significantly shorter than Fronius (10 years standard for Primo/Symo) or SolarEdge (12 years for HD-Wave models). An extension to 10 or 15 years is available for an additional fee, which increases the overall cost of owning the installation.
RS485 communication is built-in, while WiFi and GPRS require the purchase of an additional communication module. Competitors (e.g., Huawei SUN2000, Fronius Symo Advanced) integrate WiFi as standard, which simplifies remote monitoring without incurring additional costs.
Ginlong actively promotes its new 5G product line (enhanced performance and expanded Smart Energy features). Some models from the 3P-K-4G range (including Solis-3P(12-20)K-4G), are no longer being produced by ENF Solar, which could limit the availability of replacement parts and software updates over a 10-15-year lifespan.
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About the Solis-3P-K-4G series
These answers cover the whole series. Where a figure differs, the specification above is this model's own.