{"product_id":"fox-eq4800-4-66kwh-hv-battery-slave","title":"Fox EQ4800 4.66kWh HV Battery Slave","description":"\u003c!-- SEO Product Name: Fox EQ4800 4.66kWh HV Battery Slave — FE-HV-EQS-4800 (EQS4800) --\u003e\n\u003cdiv style=\"font-size:16px;font-family:Arial,Helvetica,sans-serif;color:#1a1a1a;max-width:900px;margin:0 auto;line-height:1.6;\"\u003e\n\n  \u003cp style=\"margin:0 0 18px;\"\u003e\n    The \u003cstrong\u003eFox EQ4800 4.66 kWh High Voltage Battery Slave (FE-HV-EQS-4800 \/ EQS4800)\u003c\/strong\u003e is the expansion module for Fox EQ4800 high-voltage battery stacks, and the \u003cstrong\u003edirect replacement for the EC4800 Slave\u003c\/strong\u003e. Each module adds \u003cstrong\u003e4.66 kWh of fully usable storage capacity\u003c\/strong\u003e at \u003cstrong\u003e100% depth of discharge\u003c\/strong\u003e — making the EQ4800 Slave more energy-dense than the 90% DoD ECS4300 series. A single stack supports up to \u003cstrong\u003e8 Slave modules\u003c\/strong\u003e alongside one EQM4800 Master, giving a total maximum of \u003cstrong\u003e41.93 kWh\u003c\/strong\u003e per stack. The EQS4800 is also \u003cstrong\u003ebackwards-compatible with existing EC4800 Master systems\u003c\/strong\u003e (maximum 7 modules total when mixing generations).\n  \u003c\/p\u003e\n\n  \u003cdiv style=\"display:flex;flex-wrap:wrap;gap:10px;margin-bottom:20px;\"\u003e\n    \u003cdiv style=\"flex:1;min-width:100px;background:#008377CF;color:#fff;border-radius:6px;padding:12px 10px;text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:20px;font-weight:700;\"\u003e4.66 kWh\u003c\/div\u003e\n      \u003cdiv style=\"font-size:12px;margin-top:3px;\"\u003ePer module\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex:1;min-width:100px;background:#008377CF;color:#fff;border-radius:6px;padding:12px 10px;text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:20px;font-weight:700;\"\u003e100% DoD\u003c\/div\u003e\n      \u003cdiv style=\"font-size:12px;margin-top:3px;\"\u003eFully usable\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex:1;min-width:100px;background:#008377CF;color:#fff;border-radius:6px;padding:12px 10px;text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:20px;font-weight:700;\"\u003e\u0026gt;95%\u003c\/div\u003e\n      \u003cdiv style=\"font-size:12px;margin-top:3px;\"\u003eRound-trip efficiency\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex:1;min-width:100px;background:#008377CF;color:#fff;border-radius:6px;padding:12px 10px;text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:20px;font-weight:700;\"\u003e8 max\u003c\/div\u003e\n      \u003cdiv style=\"font-size:12px;margin-top:3px;\"\u003eSlaves per stack\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"flex:1;min-width:100px;background:#008377CF;color:#fff;border-radius:6px;padding:12px 10px;text-align:center;\"\u003e\n      \u003cdiv style=\"font-size:20px;font-weight:700;\"\u003eIP65\u003c\/div\u003e\n      \u003cdiv style=\"font-size:12px;margin-top:3px;\"\u003eIndoor \/ outdoor\u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"border-left:4px solid #c0392b;background:#fff5f5;padding:10px 16px;margin-bottom:14px;border-radius:0 6px 6px 0;\"\u003e\n    \u003cstrong style=\"color:#c0392b;\"\u003e⚠ Installer Note\u003c\/strong\u003e — Must be installed by a \u003cstrong\u003equalified electrician or MCS-accredited installer\u003c\/strong\u003e. High-voltage DC battery system. Register the install on the Fox ESS portal for full warranty activation.\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"border-left:4px solid #f59e0b;background:#fff8e1;padding:10px 16px;margin-bottom:22px;border-radius:0 6px 6px 0;\"\u003e\n    \u003cstrong style=\"color:#b45309;\"\u003e⚡ Important — Slave cannot operate alone\u003c\/strong\u003e — This module requires a \u003cstrong\u003eFox EQ4800 Master (FE-HV-EQM-4800)\u003c\/strong\u003e or compatible \u003cstrong\u003eEC4800 Master\u003c\/strong\u003e to operate. Maximum 9 modules per stack with EQM4800 (41.93 kWh); maximum 7 modules when mixed with EC4800 generation. EQ4800 Slaves are also compatible with existing EC4800 Master stacks.\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"background:#008377CF;color:#fff;font-weight:600;font-size:15px;padding:10px 16px;border-radius:6px 6px 0 0;\"\u003e\n    Features \u0026amp; Benefits\n  \u003c\/div\u003e\n  \u003cdiv style=\"display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:12px;background:#e6f4f3;padding:14px;border-radius:0 0 6px 6px;margin-bottom:22px;\"\u003e\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:6px;padding:13px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#008377CF;margin-bottom:5px;\"\u003e✔ 100% DoD — No Wasted Capacity\u003c\/div\u003e\n      \u003cdiv style=\"font-size:14px;\"\u003eEvery kWh of nominal capacity is usable. At \u003cstrong\u003e100% depth of discharge\u003c\/strong\u003e, the EQ4800 Slave delivers the full 4.66 kWh per module — compared to approximately 3.73 kWh from a 4.14 kWh ECS4300 module at 90% DoD. This means fewer modules are needed for a given usable capacity target.\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:6px;padding:13px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#008377CF;margin-bottom:5px;\"\u003e✔ Upgrade Path for EC4800 Systems\u003c\/div\u003e\n      \u003cdiv style=\"font-size:14px;\"\u003eEQS4800 Slaves are \u003cstrong\u003ebackwards-compatible with existing EC4800 Master (ECM4800) stacks\u003c\/strong\u003e — if you need to expand an existing system and ECS4800 Slaves are unavailable, EQS4800 modules can be added directly. Mixed stacks are limited to 7 modules total.\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:6px;padding:13px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#008377CF;margin-bottom:5px;\"\u003e✔ Scalable Post-Installation\u003c\/div\u003e\n      \u003cdiv style=\"font-size:14px;\"\u003eAdd Slave modules at any time without disrupting the existing system — up to a maximum of \u003cstrong\u003e8 Slaves per EQM4800 Master\u003c\/strong\u003e (41.93 kWh total). The plug-and-play buckle-fix design makes on-site expansion straightforward.\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:6px;padding:13px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#008377CF;margin-bottom:5px;\"\u003e✔ LFP — Safest Lithium Chemistry\u003c\/div\u003e\n      \u003cdiv style=\"font-size:14px;\"\u003eLiFePO₄ cells have no thermal runaway risk and \u003cstrong\u003e≥6,000 cycle life\u003c\/strong\u003e — over 16 years of daily cycling. Superior safety and longevity versus NMC-based battery systems commonly used in lower-cost alternatives.\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:6px;padding:13px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#008377CF;margin-bottom:5px;\"\u003e✔ High Efficiency, High Voltage\u003c\/div\u003e\n      \u003cdiv style=\"font-size:14px;\"\u003eHigh-voltage DC architecture reduces current and resistive losses through cabling, achieving \u003cstrong\u003e\u0026gt;95% round-trip efficiency\u003c\/strong\u003e — more of what is stored actually comes back out as usable electricity.\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv style=\"background:#f0faf9;border:1px solid #c8e6e3;border-radius:6px;padding:13px;\"\u003e\n      \u003cdiv style=\"font-weight:700;color:#008377CF;margin-bottom:5px;\"\u003e✔ IP65 for Flexible Siting\u003c\/div\u003e\n      \u003cdiv style=\"font-size:14px;\"\u003eIP65-rated for both \u003cstrong\u003eindoor and outdoor installation\u003c\/strong\u003e (stand-mounted). Natural convection cooling — no fans, no noise, no moving parts. Suitable for garages, utility rooms, and sheltered outdoor locations.\u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv style=\"background:#008377CF;color:#fff;font-weight:600;font-size:15px;padding:10px 16px;border-radius:6px 6px 0 0;\"\u003eTechnical Specifications\u003c\/div\u003e\n  \u003ctable style=\"width:100%;border-collapse:collapse;margin-bottom:22px;font-size:14px;\"\u003e\n    \u003ctbody\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;width:42%;border-bottom:1px solid #c8e6e3;\"\u003ePart Number (Slave)\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003eFE-HV-EQS-4800 \/ EQS4800\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;border-bottom:1px solid #c8e6e3;\"\u003eModule Type\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003e\n\u003cstrong\u003eSlave\u003c\/strong\u003e (requires EQM4800 or ECM4800 Master)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;border-bottom:1px solid #c8e6e3;\"\u003eBattery Chemistry\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003eLFP (LiFePO₄)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;border-bottom:1px solid #c8e6e3;\"\u003eNominal Energy per Module\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003e4.66 kWh\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;border-bottom:1px solid #c8e6e3;\"\u003eDepth of Discharge\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003e\u003cstrong\u003e100%\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;border-bottom:1px solid #c8e6e3;\"\u003eRound-Trip Efficiency\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003e\u0026gt;95%\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;border-bottom:1px solid #c8e6e3;\"\u003eCycle Life\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003e≥6,000 cycles\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;border-bottom:1px solid #c8e6e3;\"\u003eNormal Capacity\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003e104 Ah\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;border-bottom:1px solid #c8e6e3;\"\u003eRecommended Charge\/Discharge Current\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003e30 A\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;border-bottom:1px solid #c8e6e3;\"\u003eMax Charge\/Discharge Current\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003e50 A\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;border-bottom:1px solid #c8e6e3;\"\u003ePeak Discharge Current (60 s)\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003e65 A\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;border-bottom:1px solid #c8e6e3;\"\u003eCommunication\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003eCAN (daisy-chain via Master)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;border-bottom:1px solid #c8e6e3;\"\u003eMax Slaves per Stack (EQM4800)\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003e8 (max stack: 41.93 kWh)\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;border-bottom:1px solid #c8e6e3;\"\u003eMax Modules (mixed EC4800 stack)\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003e7 total\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;border-bottom:1px solid #c8e6e3;\"\u003eOperating Temperature — Discharge\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003e–10°C to +55°C\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;border-bottom:1px solid #c8e6e3;\"\u003eOperating Temperature — Charge\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003e0°C to +55°C\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;border-bottom:1px solid #c8e6e3;\"\u003eIngress Protection\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003eIP65\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;border-bottom:1px solid #c8e6e3;\"\u003eCertifications\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003eIEC 62619, EN IEC 61000-6-1\/2\/3\/4, UN38.3\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#f0faf9;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;\"\u003eWarranty\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;\"\u003e\n\u003cstrong\u003e10×3 years\u003c\/strong\u003e (see Fox ESS Battery Warranty Terms)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\n\u003c\/div\u003e","brand":"Fox ESS","offers":[{"title":"Default Title","offer_id":64094196662621,"sku":"FE-HV-EQS-4800","price":1470.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/FoxESSECS41004.03kWhHVBattery_Slave_V2.jpg?v=1775380331","url":"https:\/\/qualityheating.co.uk\/products\/fox-eq4800-4-66kwh-hv-battery-slave","provider":"AIZO Quality Heating","version":"1.0","type":"link"}