Fox ESS Hybrid Inverters, PowerQ Batteries & Home Backup Systems

A PowerQ system typically combines a compatible 11.4kW split-phase hybrid inverter, EQ4000 battery modules, and Smart Hub G2 backup and energy-management hardware. Exact bundle contents vary by product, so review the bill of materials on the product page before ordering.

One PowerQ stack holds 2 to 5 EQ4000 modules at 3.97 kWh each, so a single stack ranges from 7.94 kWh to 19.85 kWh. Up to 4 stacks can be paralleled in one system, which is where the 79.4 kWh (rounded to 80 kWh) figure comes from. Each stack needs its own PowerQ inverter; the Smart Hub G2 coordinates multi-stack systems.

The CM4000 is the master battery module and includes the battery-management system. CS4000 modules are expansion modules. A supported ECS4000 stack uses one CM4000 master plus one to five CS4000 modules, for two to six modules total; current Self2Solar bundles are H3, H4, and H5 configurations with three to five modules.

No. PowerQ EQ4000 and ECS4000 are different battery families and should not be combined in the same battery stack. Match replacement or expansion modules to the exact existing system family.

PowerQ is an integrated all-in-one family in which the compatible inverter and EQ4000 modules form a coordinated stack. An H1 plus ECS4000 system uses a separately mounted H1 hybrid inverter connected to an ECS4000 battery stack built from CM4000 and CS4000 modules. The two battery families are not interchangeable.

Current Self2Solar H1 residential configurations are paired with qualified Fox ESS ECS4000 high-voltage battery systems. Compatibility and listing status depend on the exact H1 model, battery configuration, firmware, and system design; verify the product manual and system listing before purchase.

Potentially. A compatible ECS4000 battery stack, Smart Hub G2, approved wiring, transfer equipment, firmware, and a code-compliant load plan may be required. Have a qualified installer verify the existing H1 model and site electrical design before adding backup equipment.

Smart Hub G2 provides backup transfer and energy-management functions for qualified Fox ESS systems, including managed loads and supported generator integration. A grid-tied PV-only system may not need it, while an outage-backup design generally requires the approved gateway and transfer architecture.

Yes for the residential systems sold here. The PowerQ AIO system carries UL 9540 system certification with UL 1973 batteries and a UL 1741 inverter. The H1 + ECS4000 system carries UL 9540 with UL 9540A-tested ECS4000 batteries and a UL 1741 H1 inverter. Both are on the California Energy Commission list. Certificates are linked on each product page; confirm the exact model numbers against the CEC list before permitting.

H1 inverters and ECS4000 batteries carry a 12.5-year manufacturer warranty. PowerQ inverters and EQ4000 modules carry the warranty stated on their product page. Register the system with Fox ESS after commissioning and keep the invoice and serial numbers; warranty terms are set by Fox ESS US and may require registration within a set period.

The H3 Plus family includes 208V and 480V three-phase hybrid inverter models for commercial and industrial applications. CQ7 master and sub battery modules support modular commercial storage configurations. Final sizing and compatibility require an engineered design for the exact voltage, inverter model, battery quantity, and site load profile.

Self2Solar is an authorized Fox ESS distributor with warehouses in California and New Jersey. In-stock PowerQ systems, H1 and H3 inverters, ECS4000 and CQ7 batteries, and Smart Hub G2 units ship free within the continental US, typically within 2-3 business days. US-based support can check compatibility and sizing before you order, and the bill of materials on each product page shows exactly what is included.