{"product_id":"fox-ecs-4-14kwh-hv-battery-slave-ecs4300","title":"Fox ECS 4.14kWh HV Battery Slave ECS4300","description":"\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 ECS 4.14 kWh High Voltage Battery Slave (FE-HV-ECS-4300 \/ ECS4300)\u003c\/strong\u003e is an \u003cstrong\u003eexpansion module\u003c\/strong\u003e for an existing Fox ECS high-voltage battery stack. Each Slave adds \u003cstrong\u003e4.14 kWh of storage capacity\u003c\/strong\u003e to a stack managed by one ECS Master module (ECM4300). A stack can hold up to \u003cstrong\u003esix Slave modules\u003c\/strong\u003e alongside one Master, giving a maximum capacity of \u003cstrong\u003e29.03 kWh\u003c\/strong\u003e in a single stack. Slave modules use the same \u003cstrong\u003eLFP (LiFePO₄) chemistry\u003c\/strong\u003e and \u003cstrong\u003eIP65-rated enclosure\u003c\/strong\u003e as the Master and share identical electrical performance — \u003cstrong\u003e90% DoD, \u0026gt;95% round-trip efficiency, and ≥6,000 cycle life\u003c\/strong\u003e.\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;\"\u003e4.14 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;\"\u003e90% DoD\u003c\/div\u003e\n      \u003cdiv style=\"font-size:12px;margin-top:3px;\"\u003eUsable energy\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;\"\u003e29.03 kWh\u003c\/div\u003e\n      \u003cdiv style=\"font-size:12px;margin-top:3px;\"\u003eMax stack capacity\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;\"\u003eOutdoor rated\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. \u003cstrong\u003eRegister the install with Fox ESS to activate the extended 12-year warranty.\u003c\/strong\u003e\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 \u003cstrong\u003erequires a Fox ECS Master (FE-HV-ECM-4300)\u003c\/strong\u003e to function. A new installation needs at minimum 1× Master + 1× Slave. If expanding an existing stack, confirm compatibility with your current modules before ordering — consult the Fox ESS technical portal with a photo of the existing stack.\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✔ Scalable Capacity Expansion\u003c\/div\u003e\n      \u003cdiv style=\"font-size:14px;\"\u003eAdd Slave modules at any time — before or after the original installation — up to a maximum of \u003cstrong\u003e6 Slaves per Master stack\u003c\/strong\u003e. Each Slave adds exactly 4.14 kWh, allowing precise capacity planning in 4.14 kWh increments.\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✔ Identical Performance to Master\u003c\/div\u003e\n      \u003cdiv style=\"font-size:14px;\"\u003eThe Slave module shares the same LFP cell specification as the Master — \u003cstrong\u003e90% DoD, \u0026gt;95% round-trip efficiency, and ≥6,000 cycle life\u003c\/strong\u003e — ensuring consistent whole-stack performance as capacity is expanded.\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✔ Simple Buckle-Fix Connections\u003c\/div\u003e\n      \u003cdiv style=\"font-size:14px;\"\u003eModules stack vertically with a mechanical buckle-fix system and a single CAN communication daisy-chain — \u003cstrong\u003eno complex wiring or reconfiguration of the inverter\u003c\/strong\u003e is required when adding modules post-install.\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 Safety \u0026amp; Longevity\u003c\/div\u003e\n      \u003cdiv style=\"font-size:14px;\"\u003eLiFePO₄ chemistry provides inherently stable electrochemistry with \u003cstrong\u003eno thermal runaway risk\u003c\/strong\u003e — the safest lithium battery technology for residential installations. Rated for over 16 years of daily cycling at 90% DoD.\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 — Indoor or Outdoor\u003c\/div\u003e\n      \u003cdiv style=\"font-size:14px;\"\u003e\n\u003cstrong\u003eIP65 dust and water-jet protection\u003c\/strong\u003e allows installation in garages, plant rooms, or sheltered outdoor locations. Natural convection cooling — no fans, no noise, no maintenance.\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✔ Wide Operating Temperature\u003c\/div\u003e\n      \u003cdiv style=\"font-size:14px;\"\u003eDischarges reliably from \u003cstrong\u003e–10°C to +55°C\u003c\/strong\u003e, making it suitable for year-round use in unheated UK garages and outbuildings. Charge derating applies between 0°C and +15°C to protect cell longevity.\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-ECS-4300 \/ ECS4300\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 Master FE-HV-ECM-4300)\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) Prismatic Cell\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\u003e4.14 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\u003e90%\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 @ 90% DoD, 0.5C\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 (30 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\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;border-bottom:1px solid #c8e6e3;\"\u003e6 (max stack: 1 Master + 6 Slaves = 29.03 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;\"\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:#f0faf9;\"\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 (derating 0–15°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;\"\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:#f0faf9;\"\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, IEC 61000-6-1\/2\/3\/4, UN38.3\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003ctr style=\"background:#fff;\"\u003e\n\u003ctd style=\"padding:9px 14px;font-weight:600;\"\u003eWarranty\u003c\/td\u003e\n\u003ctd style=\"padding:9px 14px;\"\u003e\u003cstrong\u003e5 years standard; 12 years with online registration\u003c\/strong\u003e\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":64094263607645,"sku":"FE-HV-ECS-4300","price":1370.0,"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-ecs-4-14kwh-hv-battery-slave-ecs4300","provider":"AIZO Quality Heating","version":"1.0","type":"link"}