Weco TK-50K-XL50kW three-phase high-voltage hybrid inverter, 4 MPPT

Overview

The TK-50K-XL is the largest TK hybrid inverter: 50kW and 55kVA on a 400V three-phase grid, with four MPP trackers that accept up to 75kW of PV. Battery charge and discharge reach 100A with WeCo high-voltage LFP storage. The backup output carries the full 50kW, with 60kVA for 60 seconds, and several units can work in parallel over CAN for larger commercial systems.

• 20–50kW, 400V three-phase
• Battery 135–750V, 40A (20kW) or 100A
• 2 MPPT on 20kW, 4 MPPT from 25kW
• PV array up to 150% of AC power
• CEI 0-21 and CEI 0-16 certificates
• Up to 98.8% maximum efficiency

How it works

The TK series is a transformerless three-phase hybrid inverter for WeCo high-voltage LFP batteries between 135 and 750V. The 20kW model (TK-20K-M) has two MPP trackers and 40A battery current; the 25–50kW models (XL versions in the manual) have four trackers and 100A. Every tracker takes two strings with 30A input and 40A short-circuit current, within a 200–850V MPPT range and 1000V maximum.

PV array power can reach 150% of the AC rating, from 30kW on the 20kW model to 75kW on the 50kW. The backup output supplies the full rated power at 400V three-phase, switching over within 10ms on the 20kW and 20ms on the larger models; for the 25–50kW range the manual adds 60-second peaks of 30 to 60kVA. Maximum apparent power drawn from the grid ranges from 30 to 60kVA.

Key features

Efficiency is 98.4% maximum and 97.5% European on the 20kW, and 98.8% and 98.3% from 25kW. Protection includes PV isolator, string and battery reverse polarity protection, residual current monitoring, anti-islanding and AC overcurrent, short-circuit and overvoltage protection. Power control and zero-export control are built in, and several inverters can be connected in parallel over CAN as described in WeCo's TK parallel guide.

Installation and compatibility

The TK is wall-mounted: the 20kW model weighs 31kg (534×418×210mm), the 25–50kW models 72kg (800×620×300mm). The enclosure is IP65 with smart forced cooling, rated for −25 to +60°C and 4000m with derating above 3000m. WeCo recommends 1500mm from the floor to the bottom of the inverter, protection from direct sun, rain and snow, and no installation in coastal salt-spray areas. The 25–50kW models ship with a three-CT meter, a 10m meter cable and a Wi-Fi module.

WeCo publishes CEI 0-21 certificates for the TK 4–20 and TK 25–50 combined with several WeCo batteries, CEI 0-16 certificates for the TK 25–50, and EN 50549-1 and VDE-AR-N 4105 certificates for the 25–50kW models, plus Italian guides for the CEI 0-21 self-test and technical addendum. The manual lists the generator port of the 25–50kW models as a future function.

Monitoring and settings

Monitoring and settings use the Wi-Fi stick with WeCo's app, and an LED bar shows the operating state. The inverter warranty is five years, extendable to ten when a WeCo lithium storage system is connected and the product is registered.

Questions and answers