Knowledge base / Brands / Fox ESS / T Series inverter

Fox ESS · Solar inverter model

T Series inverter

Fox ESS T Series G3 is a current UK three-phase grid-tied solar inverter family covering 3 to 25 kW.

Specifications

SpecificationValue
Typegrid-tied string inverter
Supply phasesthree
Rated AC power (kW)3 to 25
Maximum DC input (kW)4.5 to 37.5 across T3-G3 to T25-G3
MPPT count2
Maximum input current (A)14 per MPPT on smaller ratings; 28 per MPPT on larger ratings
Maximum efficiency (%)98.6
Euro efficiency (%)97.8
Maximum MPPT efficiency (%)99.8
Battery compatibleno
Warranty (years)5 from installation, capped at 65 months from manufacture; extensions conditional
IP ratingIP65
MonitoringFoxCloud 2.0

Fox ESS T Series G3 is the three-phase grid-tied family in the current UK schedule. Fox ESS’s global catalogue also uses the broader T Series name for a separate schedule extending to 30 kW, so the generation and full model code distinguish the two ranges.

G3 string inputs and efficiency

The G3 product page covers three-phase solar conversion without a direct battery connection. String inputs change as power rises, so string design and model comparison require the complete model name.

The maximum, European and MPPT efficiencies are different test metrics rather than expected annual system yield.

T Series G3 with separate AC-coupled storage

T Series is a solar inverter, not a hybrid inverter. Adding a battery requires separate AC-coupled storage equipment with its own model-specific documents and conversion limits.

For an existing system, the rating label distinguishes G3 from earlier T Series units. Datasheet limits, firmware instructions and warranty terms should be taken from the matching generation rather than the broad family name.

The matching generation also determines the applicable warranty policy and whether an extension route applies.

Brand

Fox ESS

Reference type

Solar inverter model

Last reviewed

23 Jul 2026

Current status

Current in the manufacturer's UK range.