FOX ESS is now the battery Fused recommends for new solar-plus-battery homes. The standard package is an 11.4 kW PowerQ hybrid inverter with a 19.85 kWh LFP battery bank stacked under it, and the Fox Hub G2 that handles backup, load shedding and a generator automatically. Installed and serviced by Fused under our own electrical license EC13014750.
One box converts solar, charges the battery and powers the house. 22.8 kW of solar input on three independent trackers, 97.6% peak efficiency, revenue-grade meter built in, Type 4X for outdoor Florida installs. No cables between inverter and batteries; the modules plug together.
About the inverter →Lithium iron phosphate, 3.97 kWh each, 90% depth of discharge, over 95% round-trip efficiency, heated for cold snaps. Five modules make our 19.85 kWh standard bank; the stack takes up to seven (27.8 kWh). UL 9540 and UL 9540A listed.
200 A smart hub that disconnects from the grid in under 20 ms, carries the whole house, runs three smart circuits, and has a wired generator input with two-wire auto-start. Up to four inverters on one Hub. 12.5-year warranty like the rest of the system.
We installed standby generators for eighteen years. The problem was never the generator; it was running it for every outage, through the night, burning fuel for a refrigerator. With FOX ESS the battery carries the house silently first. If a multi-day outage drains it, the Hub starts the generator on its two-wire terminal, carries the loads, and stops it when the sun is back on the panels. Most storms never get that far. And it does not have to be a standby unit: an ordinary portable generator from Home Depot or Lowe's plugs into the Hub's generator terminal. Tesla's answer to the same problem is Powershare, which requires a Cybertruck. If you already own a generator, we connect it. If you don't, you may not need one.
The Hub has one 240 V and two 120 V circuits it can switch off by itself when the battery drops to a level you set. Put the pool pump, the second AC or the dryer on them, and the kitchen, lights and main AC keep running. With other systems that takes a separate smart panel. All our battery options →
The PowerQ inverter and the EQ4000 battery stack carry a Type 4X enclosure rating, the NEMA class that adds corrosion resistance to watertight. That is the rating you want within a few miles of the Gulf or the Bay. Tesla's Powerwall 3 datasheet lists a NEMA 3R enclosure with IP67-sealed internals; good, but not the corrosion class.
Rated to operate up to 131°F, with output derating only above 104°F, and cooled by natural convection, so there is no fan to clog or fail. Powerwall 3 is rated to 122°F. Both are outdoor units; neither belongs in direct afternoon sun if a shaded wall is available, and we site them that way.
Rated down to -13°F (Powerwall 3: -4°F), and the EQ4000 modules we install are the heated version, so a January cold snap does not stop the battery from charging. Lithium iron phosphate chemistry on all three brands; the heater is the difference.
Who makes it: FOX ESS was founded in 2019, engineers its products at its R&D center in Wuxi and builds them at its own factory in Wenzhou, China, and runs US operations and technical support from Los Angeles. S&P Global's residential storage tracker ranked FOX ESS the No. 1 residential energy storage supplier worldwide by shipments for 2025. The US products are UL 1741, UL 9540 and UL 9540A listed. Figures above are from the FOX ESS and Tesla datasheets; ask us for the current revision.
We are certified on all three, we install all three, and we service all three. Here is how the systems compare on the things that decide how a Tampa Bay home gets through a storm.
| FOX ESS PowerQ 11.4 kW + EQ4000 + Fox Hub G2 | Tesla Powerwall 3 | Enphase IQ8 + IQ Battery 5P | |
|---|---|---|---|
| How Fused builds it | One 11.4 kW all-in-one hybrid inverter with five EQ4000 modules stacked under it (19.85 kWh), Fox Hub G2 for backup, smart circuits and generator input, Tigo panel-level monitoring and rapid shutdown. Our Tier 1 system. | One Powerwall 3 (13.5 kWh, 11.5 kW) with its built-in solar inverter and a Backup Gateway 2 or Backup Switch; add an Expansion unit for 27 kWh. | IQ8 microinverters on every panel plus IQ Battery 5P units (5 kWh, 3.84 kW each; four for 20 kWh) and an IQ System Controller. |
| Storage in the standard package | 19.85 kWh, expandable to 27.8 kWh on one stack | 13.5 kWh per unit; 27 kWh with an Expansion | 5 kWh per battery; 20 kWh with four |
| Continuous backup power | 11.4 kW (with four or more battery modules) | 11.5 kW | 3.84 kW per battery; 15.4 kW with four |
| Generator input | Built into Fox Hub G2: wired generator terminal, 2-wire auto-start, runs only when the battery is low | Not listed on the Powerwall 3 datasheet | Only with the IQ System Controller 3G |
| Smart circuits (shed loads automatically in an outage) | Three in the Hub: one 240 V and two 120 V, no extra panel needed | Needs a separate smart panel or load controller | Needs a separate smart panel or load controller |
| Panel-level monitoring | Yes, with Tigo on every panel (we include it) | No, string level only | Yes, native to microinverters |
| Manufacturer warranty | 12.5 years on inverter, batteries and Hub | 10 years | 15 years on the battery |
| Noise | Under 35 dB (natural convection, no fan) | Under 50 dB typical | Quiet |
| Enclosure rating (salt air) | Type 4X on the inverter and battery stack, the NEMA rating that adds corrosion resistance; Type 3R Hub | NEMA 3R enclosure (IP67 sealed battery and electronics) | Outdoor rated |
| Operating temperature | -13°F to 131°F, derates above 104°F; battery modules are heated | -4°F to 122°F, derates above 104°F | Per Enphase datasheet |
| Who installs and services it | Fused, under our own electrical license | Fused (Tesla-certified); we also service other installers' Powerwalls | Fused (Enphase-certified) |
Figures from each manufacturer's published datasheet: FOX ESS PowerQ V1.6 (July 2026), EQ4000 V2.3 (Oct 2026), Fox Hub G2 V2.0 (May 2026); Tesla Powerwall 3 2024 North America datasheet; Enphase IQ Battery 5P. Battery systems are quoted after a site review; we don't publish battery prices because the panel, wiring and backup scope change the number.
The 11.4 kW PowerQ costs very little more than the smaller FOX models and it carries every extra: the big battery bank, the Hub's generator input and smart circuits, the panel-level monitoring. Unless the system is very small, that is the one to buy, so it is the one we build around. Against the Tesla set-up most of our customers compare it to, the standard FOX package has about six more kilowatt-hours, a generator input, load shedding without a smart panel, and two and a half more years of warranty. We still install Powerwall for customers who want it, and we still service every Powerwall and FranklinWH in the area.
With the standard five-module bank (19.85 kWh) and the 11.4 kW PowerQ, the whole home including central air conditioning. The Hub's three smart circuits automatically shed loads you choose, such as a pool pump or second AC, when the battery runs low, so the essentials last longer. Solar recharges the bank every day.
Yes. The Fox Hub G2 has a wired generator input with a two-wire auto-start. The battery carries the house first; the generator only starts when the battery is depleted and shuts off when the sun is back. That means far less fuel, noise and run time than a generator alone, and no manual transfer switch.
For most new solar-plus-battery homes in Tampa Bay we now recommend FOX ESS, because the standard package carries more storage (19.85 kWh vs 13.5 kWh), includes the generator input and smart circuits in the Hub, adds panel-level monitoring, and has a 12.5-year warranty against Tesla's 10. Tesla is still a good product and we remain Tesla-certified for installs and service; if a customer wants Powerwall, we install it.
Enphase gives you panel-level monitoring and a 15-year battery warranty, but reaching 20 kWh takes four separate IQ Battery 5P units plus a System Controller, and generator support needs the 3G controller. FOX ESS reaches the same storage in one stack with the generator input and smart circuits built into the Hub. We install both and will show you the numbers for your roof.
Outside the home on an exterior wall, like all our battery installs. The PowerQ with five EQ4000 modules is one column about 22 inches wide, 50 inches tall and 15 inches deep, Type 4X rated for Florida weather. A garage install is possible but Florida code adds curbs, extra emergency stops and fire protection, which usually isn't worth the cost.
Yes. The EQ4000 stack accepts up to seven modules (27.8 kWh), and the Fox Hub G2 supports up to four inverters if you ever need more power. We size the first install so there is room to grow.
Yes. The PowerQ inverter and battery stack carry a Type 4X enclosure rating, which is the NEMA class with corrosion resistance, and the system is rated from -13°F to 131°F. We still mount it on a shaded exterior wall and keep it off the direct salt-spray side of a waterfront home, as we do with every battery.
Yes. We are an authorized FOX ESS installer and service any battery brand for a paying customer. If your system isn't charging, isn't backing up or shows app errors, start with our $395 diagnostic.
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