Fox ESS · Solar inverter model
H3 Smart hybrid inverter
Fox ESS H3 Smart is a three-phase hybrid inverter range spanning 5 to 15 kW with three MPPTs and a high-voltage battery connection.
Specifications
| Specification | Value |
|---|---|
| Type | hybrid inverter |
| Supply phases | three |
| Rated AC power (kW) | 5, 6, 8, 10, 12 and 15 in the current UK range |
| Maximum DC input (kW) | 11, 13.2, 17.6, 18, 22.5 and 22.5 for the UK-advertised ratings |
| MPPT count | 3 |
| Maximum input current (A) | 20 per MPPT |
| Maximum efficiency (%) | 97.3 to 97.9 |
| Euro efficiency (%) | 97.2 |
| Battery compatible | yes |
| Battery-voltage range (V) | 100 to 800 |
| Battery inputs | 1 |
| Maximum battery current (A) | 50 |
| Warranty (years) | 5 from installation, capped at 65 months from manufacture; extensions conditional |
| IP rating | IP65 |
| Cooling | natural at 5, 6, 8, 9.9 and 10 kW; fan at 12 and 15 kW |
| Monitoring | FoxCloud 2.0 |
| EPS output | three-phase |
| EPS changeover (ms) | <10 |
Fox ESS H3 Smart is a three-phase hybrid inverter range. Its current UK schedule excludes the 9.9 kW regional variant in the June 2026 global datasheet.
H3 Smart string inputs and battery matching
The three MPPTs can track different string groups, but each string must use the exact model’s voltage and current schedule.
Supported battery selection depends on more than the published voltage window. The current UK page names EP5, EP6, EP11, EP12, EQ2900, EQ4300, EQ4800, EQ5000 and CQ7. The complete inverter and battery codes, current firmware and system documentation must match.
H3 Smart and H3 Pro overlap at 15 kW but use separate model schedules. The shared power class does not make their input limits interchangeable.
H3 Smart EPS and warranty records
The EPS feature does not identify the protected circuits or complete backup design.
Inverter cover is separate from battery cover. Registration evidence and the policy applying to the complete H3 Smart code should stay with the commissioning records because extensions are conditional and product-dependent.
Related entries
Manufacturer and reference sources
Brand
Reference type
Solar inverter model
Last reviewed
23 Jul 2026
Current status
Current in the manufacturer's UK range.