Growatt WIT 50-100kW US are three-phase hybrid inverters (grid-tie with energy storage) designed for commercial and industrial installations where reliable operation, scalability, and rapid response to grid outages are essential. A key feature is the built-in UPS and black start capability, enabling the system to maintain critical circuits and start up battery power even during a grid outage. The use of multiple MPPT channels facilitates optimization of energy production under varying panel orientations, uneven sunlight exposure, and partial shading-without compromising string selection. High European efficiency means lower losses under typical operating conditions and a genuinely better annual energy yield. Monitoring can be achieved through communication modules (WiFi, Ethernet, 4G) and the Growatt platform, simplifying diagnostics and remote support. The inverters are compatible with high-voltage energy storage systems, and their enclosure, featuring enhanced sealing and a complete overvoltage protection set, ensures reliability in challenging environments.
Ranking
Specifications
Pros and cons
The 100 kW model features 10 MPPT trackers (max. 32 A per input, voltage range 180-800 V), enabling multi-orientation and partially shaded installations to be served without yield losses across independent strings. According to manufacturer data, MPPT tracking efficiency reaches 99.5% under stable conditions.
The declared peak efficiency of 98.2% positions this inverter above the typical median for the 50-100 kW commercial segment (~97.5-98.0%). Support for continuous 110% AC overload increases system resilience during sudden power demand spikes without tripping.
The built-in UPS function with black start capability allows battery-powered startup without an energized grid - critical for industrial facilities with mission-critical loads. Island mode supports fully unbalanced loads (100%), which is uncommon at this power class.
The IP66/NEMA 4X protection rating permits installation in demanding industrial environments (dust, rain, pressure washing). Support for high-voltage battery packs at 750-1000 V results in lower operating currents and reduced DC-side transmission losses.
The architecture supports parallel connection of units up to a combined output of 300 kW at a single site, enabling phased investment and capacity expansion without replacing the base inverter.
Growatt does not appear on the BloombergNEF Tier 1 Bankable Power Inverter Manufacturers list (project context status: tier_1_bankable: false). In non-recourse financing arrangements with institutional lenders, the absence of this designation may require additional due diligence or serve as a disqualifying criterion with certain creditors.
The base warranty period is 5 years from factory dispatch (maximum 5.5 years from delivery), not from the commissioning date. Extension to 10 years is available at additional cost. Premium competitors such as SMA and ABB/FIMER offer 5-10 years of standard warranty counted from system startup, and Growatt's typical warranty claim turnaround of 23-40 business days compares unfavorably to the 5-10 days typical of higher-tier suppliers.
Alternatives
About the WIT 50-100kW US series
These answers cover the whole series. Where a figure differs, the specification above is this model's own.