Growatt WIT 50-100K are three-phase hybrid inverters designed for larger commercial and industrial installations, where grid working flexibility and the possibility of energy storage expansion are key. They feature built-in UPS and black start functionality, enabling selected circuits to be kept operational in emergency mode and reliably powering demanding loads in the company.
The application of multiple MPPT channels facilitates the design of rooftop installations with different roof pitches - it allows for better energy utilization in cases of shading, panels with different orientations, and uneven dirt accumulation. High European efficiency translates into genuinely higher yields under typical climatic conditions in Poland, meaning more energy annually from the same modules.
System monitoring is available via popular communication methods, including WiFi and Ethernet, as well as through an app. Additionally, the series offers surge protection type II on both DC and AC sides, and the highly sealed enclosure facilitates outdoor mounting. This is a sensible choice for companies looking to combine self-consumption with storage and backup power options.
Ranking
Specifications
Pros and cons
The EU datasheet (202405) rates peak efficiency at 98.2%, placing the series in the upper tier of three-phase hybrid C&I inverters. The high European efficiency translates into meaningfully higher annual energy yields in the Polish climate, where partial-load operating hours significantly outnumber STC-equivalent hours.
The 100K model features 10 independent MPPT inputs with a DC voltage range of 180-800 V and a maximum input voltage of 1,100 V. This enables large-scale system design on sites with multiple roof sections, mixed orientations, or partial shading, eliminating mismatch losses between strings.
The built-in UPS function (transfer time <20 ms per datasheet) and black-start capability allow selected circuits to remain energized during a grid outage without additional equipment. This is a notable advantage over conventional C&I grid-tied inverters such as the Sungrow SG50CX, which require a separate backup module.
The series supports continuous AC overload at 110% of rated power and fully unbalanced three-phase output (100% phase imbalance). This simplifies backup power for single-phase industrial loads and accommodates irregular power consumption profiles typical of commercial facilities.
The IP66/NEMA 4X enclosure allows outdoor installation without an additional protective cabinet. Integrated Type II surge protective devices (SPDs) on both the DC and AC sides reduce installation cost by eliminating the need for external SPDs otherwise required under standards such as EN 62305.
Growatt does not appear on the BloombergNEF Tier 1 Power Inverter Manufacturers list (Q1-Q2 2026). For externally financed projects - including leasing, investment loans, and PPAs - lenders and funds frequently require equipment from Tier 1-listed suppliers (e.g., Sungrow, SMA, GoodWe), which may complicate or increase the cost of financing for systems built around this series.
The base warranty period is 5 years; extension to 10 years is available as a paid option. By comparison, Sungrow's SG50-100CX-P2 series includes a 10-year standard warranty for the European market - a meaningful difference in total cost of ownership (TCO) for C&I equipment expected to operate over a 25-year system lifetime.
Alternatives
About the WIT 50-100K series
These answers cover the whole series. Where a figure differs, the specification above is this model's own.