APsystems QS22200VA single-phase microinverter for four PV modules

Overview

QS2 is APsystems' single-phase quad microinverter: one 2200VA unit serves four PV modules, each on an independent MPP tracker with 20A operating and 25A short-circuit current, so one device serves as many modules as two dual-module units. Nominal output is 9.6A at 230V, peak efficiency 96%. It weighs 6.6kg in a 365×272×40.6mm IP67 housing. Two units fit on a 4mm² bus cable branch, and APsystems designs it for residential and small-to-medium commercial rooftops.

• 2200VA continuous output at 230V single-phase
• Four inputs, four independent MPPT
• 20A input current, 25A Isc per channel
• DC side stays below 60V per input
• Mixes with DS3 and QS1 installations
• 12-year standard warranty, extendable to 25 years

How it works

The QS2 replaces four single-module microinverters with one unit. Each of its four DC inputs has its own MPP tracker working between 28 and 48V, so modules on different orientations or with partial shading are optimised separately. Operating voltage runs from 26 to 60V and the maximum input is 60V, which keeps DC wiring at low voltage and, according to APsystems, meets rapid-shutdown requirements by design. Output is 2200VA at 230V, 9.6A nominal, with Reactive Power Control and an adjustable power factor.

Key features

Each channel accepts 20A operating and 25A short-circuit current, matching current high-power modules. Peak efficiency is 96% and MPPT efficiency 99.5%, with 20mW night consumption. Components are silicone-encapsulated in an IP67, fanless housing rated for -40 to +65°C ambient, with derating possible where ventilation is poor. Galvanically isolated high-frequency transformers and an integrated protection relay are part of the design. APsystems presents the QS2 as compatible with DS3 and QS1 systems, useful for upgrades and mixed installations.

Installation and compatibility

The QS2 connects to the APsystems Y3 single-phase AC bus cable; the datasheet allows two units per 4mm² bus cable branch, subject to local limits. Leave at least 1.5cm above and below the housing, keep DC leads within 3m and connect each module to a single channel. Grounding works through the bus cable PE wire, the grounding washer on a grounded rack or an external lug. Bipolar breakers are mandatory; RCDs only where local code requires them.

The EMEA datasheet lists EN 50549-1/-10, NF EN 50549-1/-10, UNE 217001, UNE 217002, NTS and G98/G99 among its grid compliances, and APsystems publishes the matching certificates. CEI 0-21 and VDE-AR-N 4105 are not in that list, so check national grid-code approval before planning an Italian or German connection.

Monitoring and warranty

Each channel is monitored separately. Data travels over encrypted ZigBee to an APsystems ECU and from there to the EMA web portal and EMA Manager app; APsystems recommends no more than 80 inverters per ECU. The standard warranty is 12 years and can be extended to 25, provided the system stays connected to EMA through the ECU; without that connection only the 2-year legal warranty applies.

Questions and answers