H1 hybrid inverter

Fox ESS H1 G2 is a single-phase hybrid inverter. It connects solar strings and a compatible high-voltage battery to one inverter. One nominal rating is marketed as 3.7 kW in the UK and specified more precisely as 3.68 kW. The wider family also contains 2.5, 4 and 4.6 kW variants.

Full H1 G2 code	Rated AC output	Maximum PV input	Current UK range
H1-2.5-E-G2	2.5 kW	5 kW	no
H1-3.0-E-G2	3 kW	6 kW	yes
H1-3.7-E-G2	3.68 kW	7.4 kW	yes, advertised as 3.7 kW
H1-4.0-E-G2	4 kW	8 kW	no
H1-4.6-E-G2	4.6 kW	9.2 kW	no
H1-5.0-E-G2	5 kW	10 kW	yes
H1-6.0-E-G2	6 kW	12 kW	yes

Wireless-LAN variants add -WL to these codes. That ending is part of the model identity.

H1 G2 solar inputs and battery matching

The MPPT arrangement allows two separately controlled solar inputs. The array must still fit the chosen model’s voltage, operating-current and short-circuit-current limits, including the cold-weather open-circuit voltage calculation.

The broad battery electrical limits are not a compatibility list. The exact battery and inverter firmware must be supported together, so a generic reference to a Fox battery is not enough.

AC1 G2 is the related AC-coupled storage inverter. It shares much of H1’s platform but omits the solar inputs.

H1 G2 EPS and model records

H1 G2 has an EPS output with a specified changeover time. The protected circuits are defined by the installed system rather than by the inverter model.

H1 has existed in more than one generation. The complete -G2 code distinguishes the current product where that is the supplied model, while service work should use the rating label rather than assuming a current datasheet applies to an older H1. The same complete code identifies the applicable warranty policy and any extension route.

Related entries

• Fox ESS
• AC1 AC charger
• EP5 battery
• Hybrid inverter
• String design voltage windows