Weco XTR-20K20kW three-phase hybrid inverter for 51.2V batteries

Overview

The XTR-20K is the largest XTR-3 LV inverter: 20kW and 22kVA on three phases, fed by a 51.2V battery at up to 380A in both directions. Three MPP trackers accept up to 40kW of PV, 30kW usable. The backup output carries the full rated power with 150% for 10 seconds, and battery-to-load efficiency reaches 97.8%. Up to 8.5kW can be drawn from a single phase.

• 6–20kW three-phase on a 51.2V battery
• 380A charge, up to 380A discharge
• 2 MPPT up to 8kW, 3 MPPT from 10kW
• Up to 40kW PV connected, 30kW usable
• 200% backup overload for 10s (20kW: 150%)
• 2 to 9 units in parallel

How it works

The XTR-3 LV connects a three-phase grid and backup output to a 51.2V battery bank working between 40 and 60V. Charging power is 20kW on every size, at up to 380A, while discharge current grows with the model from 150A on the 6kW to 380A on the 20kW. Two battery power inputs and one battery CAN port are provided, and the manual also includes settings for lead-acid batteries with a temperature sensor.

PV is handled by two MPP trackers on the 6 and 8kW models and three from 10kW, with one string each, 20A input and 30A short-circuit current, a 160–980V full-power range and 1000V maximum. Connected PV can reach 25kW on the 6 and 8kW and 40kW from 10kW, of which 20kW or 30kW is usable. Each phase can supply up to 4.3kW on the smaller models and 8.5kW from 10kW.

Key features

The backup output supplies the full rated power with 200% for 10 seconds, 150% on the 20kW, and switches over in 10ms on average. A generator can be connected at full power, and between two and nine inverters can work in parallel through the PARAL port with its termination switch. Efficiency is 97.7% maximum and 97.0% European, and battery-to-load efficiency reaches 97.5–97.8%.

Installation and compatibility

The XTR is wall-mounted, weighs 50kg, or 40kg without accessories, and measures 450×781×266mm. It is IP65 with smart cooling, works from −25 to +60°C with derating above 45°C, and WeCo recommends 1500mm between floor and inverter base. The manual specifies a battery breaker of at least 400A DC and at least 50A AC on backup, generator and grid lines, none supplied, and allows a 50A CT or an Eastron SDM630 or SEM3-WL meter.

Communication with the BMS runs over RS485 or CAN using the WeCo-CAN protocol, with RS485 for the meter and a Wi-Fi logger for the portal. WeCo publishes a CEI 0-21 certificate for the XTR 6–20kW range; the datasheet lists EN 62109-1/-2 and IEC 61000-6-1 to -4, IEC 61000-3-11 and IEC 61000-3-12.

Monitoring and settings

Commissioning, parameter settings and firmware updates use the NooR app with the Wi-Fi logger, and the CT or meter choice is also set in the app. 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