Solis solar kit 31.86kWp – S5-GC25K 25kW three-phase string inverter31.86kWp commercial on-grid kit with 25kW three-phase inverter

Overview

A commercial grid-tied kit of 31.86kWp with the Solis S5-GC25K, a 25kW three-phase string inverter with three MPPTs and two strings per MPPT. Solis recommends up to 37.5kW of PV for this model, so the array leaves headroom while keeping the inverter well loaded. Type II surge protection on both sides, string monitoring with I-V curve scanning and 98.5% maximum efficiency make it a fit for offices, shops and small production sites.

• Solis string inverter with matched PV module set
• Single-phase 3kW or three-phase 25kW
• IP66 outdoor enclosures
• Export power control supported
• CEI 0-21, EN 50549-1 and VDE-AR-N 4105 listed
• Optional WiFi or GPRS logger for SolisCloud

What's in the kit

• 1 × Solis S5-GC25K
• null × PV modules, 31.86kWp in total

System overview

These kits are plain grid-tied systems: PV modules feed a Solis string inverter that supplies the building's loads and exports any surplus. There is no battery input, which keeps the system simple and inexpensive for daytime self-consumption. The residential kit pairs 3.54kWp with the single-phase S6-GR1P3K-M; the commercial kit pairs 31.86kWp with the three-phase S5-GC25K, both within the recommended maximum PV power that Solis publishes.

Inverter data

The S6-GR1P3K-M has one MPPT for up to two strings, an 80–500V MPPT range, 550V maximum input voltage and 19A input current, and delivers 3kW and 3.3kVA at 220/230V. The S5-GC25K has three MPPTs for two strings each at 32A, a 200–1000V MPPT range and 1100V maximum input voltage, and delivers 25kW, 27.5kVA at 230/400V with 98.5% maximum efficiency. Both are IP66 and work from -25…+60°C.

Protection and grid compliance

Solis lists DC reverse polarity, short-circuit, output overcurrent and anti-islanding protection and grid monitoring on both inverters. AFCI is optional on the S6-GR1P3K-M and integrated, with activation required, on the S5-GC25K. The S5-GC25K adds Type II surge protection on DC and AC, string monitoring and I-V curve scanning, and an optional night-time PID recovery. Grid standards in the datasheets include CEI 0-21, EN 50549-1, VDE-AR-N 4105/VDE V 0124, G99 and C10/11.

What the installer adds

The installer provides mounting structures, DC cabling and any string protection, AC cabling with breaker and residual-current device, and an export meter where the site needs power limitation. Communication is RS485 as standard, with optional WiFi or GPRS loggers for remote monitoring and firmware upgrades through SolisCloud. A grid connection request to the local operator is required before commissioning.

Questions and answers