The GoodWe ET LV series are three-phase hybrid inverters designed for installations where autonomous consumption, flexible expansion, and stable home power even with grid limitations are key priorities. This solution cooperates with low-voltage energy storage systems (48 V), making it easier to select the accumulator capacity based on real needs and enabling phased investment.
Depending on the variant, they feature 2-4 independent MPPTs, facilitating optimisation of yields at different roof orientations, PV expansion, or seasonal shading - each string can operate closer to its own optimum. The high European efficiency translates to lower losses under typical climatic conditions in Poland, meaning more energy fed into the system annually, not just under laboratory maximums.
On a daily basis, you benefit from monitoring via SEMS (application and portal) as well as convenient communication options, including WiFi and wired integration possibilities. The series offers safety features (among others: protection and diagnostics), and in practice, they are often chosen for demanding homes and small commercial properties planning for energy storage and backup power.
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Specifications
Pros and cons
The 12 kW model achieves a maximum efficiency of 97.8%, while the 10 kW model achieves 97.6%, placing the series among the leading three-phase hybrid inverters (SolarEdge ~97.6%). High European efficiency translates into real energy savings in the Polish climate, characterized by significant periods of partial sunlight (X-III).
The transition time to backup power is less than 4 ms, meeting the requirements of sensitive devices (computers, NAS, heat pumps with inverters). Typical solutions without UPS systems achieve 20-30 ms - a significant difference when using sensitive controllers.
The IP66 protection rating exceeds the typical IP65 standard used by many competitors, allowing for outdoor installation without the need for additional enclosures. The permitted over-sizing of the PV system up to 200% of AC power allows for effective battery charging, even with the dispersed radiation typical of Polish November-February.
The inverter is compatible with a wide range of LV storage systems from various manufacturers (as confirmed in GoodWe's official Battery Compatibility Overview), allowing the installer to choose from multiple brands - unlike the closed ecosystems of Huawei (LUNA2000) and SolarEdge (Energy Hub). It enables phased capacity expansion without replacing the inverter.
The standard 5-year warranty is extended free of charge to 10 years after online registration and installation by a certified GoodWe PLUS+ installer. For 3-phase hybrid inverters in the 5-20 kW range, this is one of the longer free warranty periods available on the Polish market.
With power outputs of 15-20 kW, the charging/discharging current of a 48 V battery exceeds 300 A (theoretically ~417 A for 20 kW), which requires DC cables with a cross-section of ≥95 mm² of copper or multiple parallel conductors, increasing installation costs. High-voltage systems (e.g., Huawei LUNA2000 at a nominal ~200 V) reduce this current to approximately 100 A, simplifying and reducing the cabling costs.
The allowable DC input voltage is 600 V, while certain premium-class hybrid inverters (e.g., SMA SHP, Fronius Symo Hybrid GEN24) support 1000 V. This limits the maximum string length for modules with high Voc and may require shortening the strings or using an additional MPPT.
Alternatives
About the ET LV series
These answers cover the whole series. Where a figure differs, the specification above is this model's own.