20K-2T / 20K-3T grid-tied string inverter 20 kW
Country: Germany · Model: 20K-2T / 20K-3T
A three-phase transformerless string inverter with a rating of 20 kW, able to deliver up to 22 kVA to the grid, made with two or three MPP trackers. It is installed at commercial rooftop and ground-mounted solar plants, and at old plants during modernisation, because it is compatible with inverters of previous generations of this series.
- Rated power
- 20 kW (max. 22 kVA)
- MPP trackers
- 2 (20K-2T); 3 (20K-3T)
- Max. PV power
- 30 kWp (DC/AC 150 %)
- DC voltage
- max. 1100 V; MPPT 480–850 V
Technical specifications
| Rated power | 20 kW (max. 22 kVA) |
|---|---|
| MPP trackers | 2 (20K-2T); 3 (20K-3T) |
| Max. PV power | 30 kWp (DC/AC 150 %) |
| DC voltage | max. 1100 V; MPPT 480–850 V |
| Grid | 3P/N/PE 230/400 V, 50/60 Hz |
| Efficiency | max. 98.6 %, European 98.2 % |
| Protection rating | IP65 |
| Dimensions / weight | 430×520×189 mm, 22 kg (2T); 480×585×220 mm, 36 kg (3T) |
| Protection | DC disconnect, DC SPD type I+II, AFCI (option) |
| Standards | EN 50549-1, VDE-AR-N 4105, IEC 62109-1/2, IEC 62116 |
Specifications are taken from the manufacturer’s technical documentation. Updated .
Description
A PV array with a peak power of up to 30 kWp can be connected to the input, that is, the DC/AC ratio can reach 150 %. The absolute DC voltage limit is 1100 V, tracking works in the 480–850 V window, and the number of modules in a string is calculated for it. The output connects to a three-phase 3P/N/PE 230/400 V grid at 50/60 Hz. The peak efficiency is 98.6 %, the European efficiency 98.2 %. The IP65 case is fixed to a wall or to a support structure under the panels. The DC input has a disconnect and a type I+II SPD, and AFCI arc protection is ordered as an option. Compliance with EN 50549-1 and VDE-AR-N 4105 concerns connection to low-voltage grids, IEC 62109-1/2 the safety of the converter, and IEC 62116 testing of anti-islanding protection. The manufacturer's warranty is 10 years.
How to choose
The version is determined by the number of independent module groups on the roof. A two-pitch roof is covered by the 20K-2T, and an array with three orientations or different tilt angles is better split across the three trackers of the 20K-3T. If the array is larger than 30 kWp, move to the 25K-3T or 33K-3T with arrays of up to 37.5 and 49.5 kWp, and a roof of 75 kWp already needs the 50K-4T.
Request a price and lead time
20K-2T / 20K-3T grid-tied string inverter 20 kW. We reply within one business day.
Or email office@usk.ua or call +38 (044) 339-50-20.
FAQ
How many kWp of panels can be connected to the 20K-2T inverter?
Up to 30 kWp, which corresponds to a DC overload of 150 % of the rated 20 kW. Such a margin makes sense for east–west roofs and panels with a small tilt angle.
How does the 20K-2T differ from the 20K-3T?
The smaller version has two MPP trackers, a 430×520×189 mm case and a weight of 22 kg. The larger one has three trackers and weighs 36 kg with dimensions of 480×585×220 mm.
How is the string length calculated for the 480–850 V MPPT range?
The operating voltage of the string in heat must not fall below 480 V, and the open-circuit voltage in frost must not exceed 1100 V. The exact number of modules is calculated from the temperature coefficients of the specific panel.
Can the 20K-3T be installed at an old plant together with inverters of the previous series?
Yes, the inverter is compatible with units of previous generations of this series, so during modernisation only part of the equipment is replaced. The other inverters of the plant keep working.
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