{"product_id":"fox-ess-cq16-bms-control-box-high-voltage-battery-management-system-for-cq16-storage-systems","title":"Fox ESS CQ16 BMS Control Box | High Voltage Battery Management System for CQ16 Storage Systems","description":"\u003cdiv style=\"font-size:16px; max-width:900px; margin:0 auto; font-family:Arial, Helvetica, sans-serif; color:#222; line-height:1.55;\"\u003e\n\u003cdiv style=\"margin:0 0 24px 0;\"\u003e\nThe \u003cstrong\u003eFox ESS CQ16 BMS Control Box\u003c\/strong\u003e (branded by the manufacturer as the \u003cstrong\u003eCQ BOX\u003c\/strong\u003e) is the\n\u003cstrong\u003emaster battery management unit\u003c\/strong\u003e required by every Fox ESS CQ16 high-voltage battery system. It monitors\nand coordinates the connected CQ16 modules across an \u003cstrong\u003eoperating voltage range of 101–1000Vdc\u003c\/strong\u003e, managing\n\u003cstrong\u003eup to 240A of charge and discharge current\u003c\/strong\u003e with \u003cstrong\u003e±0.5% FSR voltage measurement accuracy\u003c\/strong\u003e and\n\u003cstrong\u003e\u0026gt;92% charge\/discharge efficiency\u003c\/strong\u003e, communicating with the Fox ESS H3 Plus inverter via CAN bus.\n\u003c\/div\u003e\n\n    \u003cdiv style=\"display:flex; flex-wrap:wrap; gap:10px; margin:24px 0;\"\u003e\n        \u003cdiv style=\"flex:1 1 140px; background:#00837714; border:1px solid #008377CF; border-radius:8px; padding:14px 10px; text-align:center; min-width:140px;\"\u003e\n            \u003cdiv style=\"font-size:20px; font-weight:700; color:#008377CF;\"\u003e101–1000V\u003c\/div\u003e\n            \u003cdiv style=\"font-size:13px; color:#444; margin-top:4px;\"\u003eOperating Voltage Range\u003c\/div\u003e\n        \u003c\/div\u003e\n        \u003cdiv style=\"flex:1 1 140px; background:#00837714; border:1px solid #008377CF; border-radius:8px; padding:14px 10px; text-align:center; min-width:140px;\"\u003e\n            \u003cdiv style=\"font-size:20px; font-weight:700; color:#008377CF;\"\u003e240A\u003c\/div\u003e\n            \u003cdiv style=\"font-size:13px; color:#444; margin-top:4px;\"\u003eMax Charge\/Discharge\u003c\/div\u003e\n        \u003c\/div\u003e\n        \u003cdiv style=\"flex:1 1 140px; background:#00837714; border:1px solid #008377CF; border-radius:8px; padding:14px 10px; text-align:center; min-width:140px;\"\u003e\n            \u003cdiv style=\"font-size:20px; font-weight:700; color:#008377CF;\"\u003e±0.5% FSR\u003c\/div\u003e\n            \u003cdiv style=\"font-size:13px; color:#444; margin-top:4px;\"\u003eVoltage Accuracy\u003c\/div\u003e\n        \u003c\/div\u003e\n        \u003cdiv style=\"flex:1 1 140px; background:#00837714; border:1px solid #008377CF; border-radius:8px; padding:14px 10px; text-align:center; min-width:140px;\"\u003e\n            \u003cdiv style=\"font-size:20px; font-weight:700; color:#008377CF;\"\u003e\u0026gt;92%\u003c\/div\u003e\n            \u003cdiv style=\"font-size:13px; color:#444; margin-top:4px;\"\u003eEfficiency\u003c\/div\u003e\n        \u003c\/div\u003e\n        \u003cdiv style=\"flex:1 1 140px; background:#00837714; border:1px solid #008377CF; border-radius:8px; padding:14px 10px; text-align:center; min-width:140px;\"\u003e\n            \u003cdiv style=\"font-size:20px; font-weight:700; color:#008377CF;\"\u003e64.28–241.05kWh\u003c\/div\u003e\n            \u003cdiv style=\"font-size:13px; color:#444; margin-top:4px;\"\u003eRated Energy Range\u003c\/div\u003e\n        \u003c\/div\u003e\n        \u003cdiv style=\"flex:1 1 140px; background:#00837714; border:1px solid #008377CF; border-radius:8px; padding:14px 10px; text-align:center; min-width:140px;\"\u003e\n            \u003cdiv style=\"font-size:20px; font-weight:700; color:#008377CF;\"\u003e29kg\u003c\/div\u003e\n            \u003cdiv style=\"font-size:13px; color:#444; margin-top:4px;\"\u003eWeight\u003c\/div\u003e\n        \u003c\/div\u003e\n    \u003c\/div\u003e\n    \n\n    \u003cdiv style=\"border-left:4px solid #C0392B; background:#FDEDEC; padding:12px 16px; margin:18px 0; border-radius:4px;\"\u003e\n        \u003cdiv style=\"font-weight:700; color:#C0392B; margin-bottom:4px;\"\u003eOne Required Per System\u003c\/div\u003e\n        \u003cdiv style=\"color:#333;\"\u003eEvery Fox ESS CQ16 battery system requires \u003cstrong\u003eexactly one BMS Control Box\u003c\/strong\u003e, regardless of the number of battery stacks connected. It must be installed and commissioned by a qualified electrician.\u003c\/div\u003e\n    \u003c\/div\u003e\n    \n\n    \u003cdiv style=\"border-left:4px solid #B9770E; background:#FEF5E7; padding:12px 16px; margin:18px 0; border-radius:4px;\"\u003e\n        \u003cdiv style=\"font-weight:700; color:#B9770E; margin-bottom:4px;\"\u003eSold Separately from Battery Modules\u003c\/div\u003e\n        \u003cdiv style=\"color:#333;\"\u003eThe Control Box is \u003cstrong\u003enot included with individual CQ16 battery modules\u003c\/strong\u003e and must be ordered as a separate line item to complete a working battery system.\u003c\/div\u003e\n    \u003c\/div\u003e\n    \n\n    \u003cdiv style=\"border-left:4px solid #008377CF; background:#00837714; padding:12px 16px; margin:18px 0; border-radius:4px;\"\u003e\n        \u003cdiv style=\"font-weight:700; color:#008377CF; margin-bottom:4px;\"\u003eSystem Role\u003c\/div\u003e\n        \u003cdiv style=\"color:#333;\"\u003eThe Control Box acts as the \u003cstrong\u003ecentral battery management system (BMS)\u003c\/strong\u003e, aggregating voltage, current and communication data from every connected CQ16 module stack and relaying it to the Fox ESS H3 Plus inverter over CAN.\u003c\/div\u003e\n    \u003c\/div\u003e\n    \n\n    \u003cdiv style=\"display:flex; flex-wrap:wrap; gap:14px; margin:24px 0;\"\u003e\n        \u003cdiv style=\"flex:1 1 260px; min-width:260px; border:1px solid #E0E0E0; border-radius:8px; padding:16px; background:#FFFFFF;\"\u003e\n            \u003cdiv style=\"font-weight:700; color:#008377CF; margin-bottom:6px;\"\u003eWide Operating Voltage Window\u003c\/div\u003e\n            \u003cdiv style=\"color:#333; font-size:15px;\"\u003eSupporting \u003cstrong\u003e101–1000Vdc\u003c\/strong\u003e, the Control Box accommodates the full voltage range of a CQ16 system as it scales from the minimum 4-module configuration up to the maximum 15-module, 241.05kWh build.\u003c\/div\u003e\n        \u003c\/div\u003e\n        \u003cdiv style=\"flex:1 1 260px; min-width:260px; border:1px solid #E0E0E0; border-radius:8px; padding:16px; background:#FFFFFF;\"\u003e\n            \u003cdiv style=\"font-weight:700; color:#008377CF; margin-bottom:6px;\"\u003ePrecise Voltage Monitoring\u003c\/div\u003e\n            \u003cdiv style=\"color:#333; font-size:15px;\"\u003eA \u003cstrong\u003e±0.5% FSR total voltage measurement accuracy\u003c\/strong\u003e gives the connected inverter reliable state-of-charge data, supporting safe and efficient charge\/discharge management across the whole battery bank.\u003c\/div\u003e\n        \u003c\/div\u003e\n        \u003cdiv style=\"flex:1 1 260px; min-width:260px; border:1px solid #E0E0E0; border-radius:8px; padding:16px; background:#FFFFFF;\"\u003e\n            \u003cdiv style=\"font-weight:700; color:#008377CF; margin-bottom:6px;\"\u003eBidirectional Current Sensing\u003c\/div\u003e\n            \u003cdiv style=\"color:#333; font-size:15px;\"\u003eCurrent measurement across a \u003cstrong\u003e−240A to +240A range\u003c\/strong\u003e allows the Control Box to track both charging and discharging in real time, protecting the battery stack from over-current conditions.\u003c\/div\u003e\n        \u003c\/div\u003e\n        \u003cdiv style=\"flex:1 1 260px; min-width:260px; border:1px solid #E0E0E0; border-radius:8px; padding:16px; background:#FFFFFF;\"\u003e\n            \u003cdiv style=\"font-weight:700; color:#008377CF; margin-bottom:6px;\"\u003eCAN Bus Communication\u003c\/div\u003e\n            \u003cdiv style=\"color:#333; font-size:15px;\"\u003eA dedicated \u003cstrong\u003eCAN communication interface\u003c\/strong\u003e links the Control Box directly to the Fox ESS H3 Plus inverter, forming the data backbone for the whole battery system's charge\/discharge coordination.\u003c\/div\u003e\n        \u003c\/div\u003e\n        \u003cdiv style=\"flex:1 1 260px; min-width:260px; border:1px solid #E0E0E0; border-radius:8px; padding:16px; background:#FFFFFF;\"\u003e\n            \u003cdiv style=\"font-weight:700; color:#008377CF; margin-bottom:6px;\"\u003eHigh Round-Trip Efficiency\u003c\/div\u003e\n            \u003cdiv style=\"color:#333; font-size:15px;\"\u003eA rated \u003cstrong\u003echarge\/discharge efficiency above 92%\u003c\/strong\u003e means minimal energy loss is introduced by the management layer itself, preserving the round-trip efficiency of the wider storage system.\u003c\/div\u003e\n        \u003c\/div\u003e\n        \u003cdiv style=\"flex:1 1 260px; min-width:260px; border:1px solid #E0E0E0; border-radius:8px; padding:16px; background:#FFFFFF;\"\u003e\n            \u003cdiv style=\"font-weight:700; color:#008377CF; margin-bottom:6px;\"\u003eMatched Form Factor\u003c\/div\u003e\n            \u003cdiv style=\"color:#333; font-size:15px;\"\u003eSharing the same \u003cstrong\u003e390 × 235 × 810mm\u003c\/strong\u003e footprint as the CQ16 battery modules, the Control Box stacks alongside battery banks for a consistent, space-efficient plant room installation.\u003c\/div\u003e\n        \u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003ctable style=\"width:100%; border-collapse:collapse; margin:24px 0; font-size:15px;\"\u003e\n\u003ctr\u003e\u003ctd colspan=\"2\" style=\"background:#008377CF; color:#FFFFFF; font-weight:700; padding:10px 12px; border:1px solid #008377CF;\"\u003eBattery Management System\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr style=\"background:#F5F9F9;\"\u003e\n\u003ctd style=\"padding:8px 12px; border:1px solid #E0E0E0; font-weight:600; width:45%;\"\u003eModel\u003c\/td\u003e\n\u003ctd style=\"padding:8px 12px; border:1px solid #E0E0E0;\"\u003eCQ BOX\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#FFFFFF;\"\u003e\n\u003ctd style=\"padding:8px 12px; border:1px solid #E0E0E0; font-weight:600; width:45%;\"\u003eOperating Voltage Range\u003c\/td\u003e\n\u003ctd style=\"padding:8px 12px; border:1px solid #E0E0E0;\"\u003e101 – 1000 Vdc\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#F5F9F9;\"\u003e\n\u003ctd style=\"padding:8px 12px; border:1px solid #E0E0E0; font-weight:600; width:45%;\"\u003eMax. Charge\/Discharge Current\u003c\/td\u003e\n\u003ctd style=\"padding:8px 12px; border:1px solid #E0E0E0;\"\u003e240 A \/ 240 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#FFFFFF;\"\u003e\n\u003ctd style=\"padding:8px 12px; border:1px solid #E0E0E0; font-weight:600; width:45%;\"\u003eTotal Voltage Measurement Accuracy\u003c\/td\u003e\n\u003ctd style=\"padding:8px 12px; border:1px solid #E0E0E0;\"\u003e±0.5% FSR\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#F5F9F9;\"\u003e\n\u003ctd style=\"padding:8px 12px; border:1px solid #E0E0E0; font-weight:600; width:45%;\"\u003eCurrent Measurement Range\u003c\/td\u003e\n\u003ctd style=\"padding:8px 12px; border:1px solid #E0E0E0;\"\u003e−240 to +240 A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#FFFFFF;\"\u003e\n\u003ctd style=\"padding:8px 12px; border:1px solid #E0E0E0; font-weight:600; width:45%;\"\u003eCommunication Interface\u003c\/td\u003e\n\u003ctd style=\"padding:8px 12px; border:1px solid #E0E0E0;\"\u003eCAN\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#F5F9F9;\"\u003e\n\u003ctd style=\"padding:8px 12px; border:1px solid #E0E0E0; font-weight:600; width:45%;\"\u003eCharge\/Discharge Efficiency\u003c\/td\u003e\n\u003ctd style=\"padding:8px 12px; border:1px solid #E0E0E0;\"\u003e\u0026gt;92%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#FFFFFF;\"\u003e\n\u003ctd style=\"padding:8px 12px; border:1px solid #E0E0E0; font-weight:600; width:45%;\"\u003eRated Energy Range (System)\u003c\/td\u003e\n\u003ctd style=\"padding:8px 12px; border:1px solid #E0E0E0;\"\u003e64.28 – 241.05 kWh\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd colspan=\"2\" style=\"background:#008377CF; color:#FFFFFF; font-weight:700; padding:10px 12px; border:1px solid #008377CF;\"\u003eGeneral Specification\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr style=\"background:#F5F9F9;\"\u003e\n\u003ctd style=\"padding:8px 12px; border:1px solid #E0E0E0; font-weight:600; width:45%;\"\u003eDimensions (W×H×D)\u003c\/td\u003e\n\u003ctd style=\"padding:8px 12px; border:1px solid #E0E0E0;\"\u003e390 × 235 × 810 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#FFFFFF;\"\u003e\n\u003ctd style=\"padding:8px 12px; border:1px solid #E0E0E0; font-weight:600; width:45%;\"\u003eWeight\u003c\/td\u003e\n\u003ctd style=\"padding:8px 12px; border:1px solid #E0E0E0;\"\u003e29 ±1 kg\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#F5F9F9;\"\u003e\n\u003ctd style=\"padding:8px 12px; border:1px solid #E0E0E0; font-weight:600; width:45%;\"\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd style=\"padding:8px 12px; border:1px solid #E0E0E0;\"\u003eCharge: 0–55°C \/ Discharge: −10–55°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#FFFFFF;\"\u003e\n\u003ctd style=\"padding:8px 12px; border:1px solid #E0E0E0; font-weight:600; width:45%;\"\u003eStorage Temperature\u003c\/td\u003e\n\u003ctd style=\"padding:8px 12px; border:1px solid #E0E0E0;\"\u003e−10 to 55°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#F5F9F9;\"\u003e\n\u003ctd style=\"padding:8px 12px; border:1px solid #E0E0E0; font-weight:600; width:45%;\"\u003eHumidity\u003c\/td\u003e\n\u003ctd style=\"padding:8px 12px; border:1px solid #E0E0E0;\"\u003e5 – 95%\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003cdiv style=\"margin:24px 0;\"\u003e\n\u003cdetails style=\"margin-bottom:10px; border:1px solid #E0E0E0; border-radius:6px; overflow:hidden;\"\u003e\n    \u003csummary style=\"background:#008377CF; color:#FFFFFF; font-weight:700; padding:12px 16px; cursor:pointer; list-style:none;\"\u003eHow many BMS Control Boxes does my system need?\u003c\/summary\u003e\n    \u003cdiv style=\"padding:12px 16px; background:#FAFAFA; color:#333;\"\u003eJust \u003cstrong\u003eone per CQ16 battery system\u003c\/strong\u003e, regardless of how many battery stacks or modules are connected — it acts as the single master battery management unit.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom:10px; border:1px solid #E0E0E0; border-radius:6px; overflow:hidden;\"\u003e\n    \u003csummary style=\"background:#008377CF; color:#FFFFFF; font-weight:700; padding:12px 16px; cursor:pointer; list-style:none;\"\u003eIs the Control Box included with the CQ16 battery modules?\u003c\/summary\u003e\n    \u003cdiv style=\"padding:12px 16px; background:#FAFAFA; color:#333;\"\u003eNo, it is \u003cstrong\u003esold as a separate item\u003c\/strong\u003e and must be ordered alongside the battery modules, battery bases and cable packs to complete a working system.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom:10px; border:1px solid #E0E0E0; border-radius:6px; overflow:hidden;\"\u003e\n    \u003csummary style=\"background:#008377CF; color:#FFFFFF; font-weight:700; padding:12px 16px; cursor:pointer; list-style:none;\"\u003eWhat voltage range does the Control Box support?\u003c\/summary\u003e\n    \u003cdiv style=\"padding:12px 16px; background:#FAFAFA; color:#333;\"\u003eIt operates across \u003cstrong\u003e101–1000Vdc\u003c\/strong\u003e, covering the full voltage span of a CQ16 system from its minimum to maximum configuration.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom:10px; border:1px solid #E0E0E0; border-radius:6px; overflow:hidden;\"\u003e\n    \u003csummary style=\"background:#008377CF; color:#FFFFFF; font-weight:700; padding:12px 16px; cursor:pointer; list-style:none;\"\u003eHow does the Control Box communicate with the inverter?\u003c\/summary\u003e\n    \u003cdiv style=\"padding:12px 16px; background:#FAFAFA; color:#333;\"\u003eIt connects to the \u003cstrong\u003eFox ESS H3 Plus inverter via CAN bus\u003c\/strong\u003e, relaying real-time voltage, current and system status data.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails style=\"margin-bottom:10px; border:1px solid #E0E0E0; border-radius:6px; overflow:hidden;\"\u003e\n    \u003csummary style=\"background:#008377CF; color:#FFFFFF; font-weight:700; padding:12px 16px; cursor:pointer; list-style:none;\"\u003eWhat is the charge\/discharge efficiency of the Control Box?\u003c\/summary\u003e\n    \u003cdiv style=\"padding:12px 16px; background:#FAFAFA; color:#333;\"\u003eThe unit is rated at \u003cstrong\u003egreater than 92% charge\/discharge efficiency\u003c\/strong\u003e, minimising energy loss introduced by the battery management layer.\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Fox ESS","offers":[{"title":"Default Title","offer_id":65251759882589,"sku":"FE-CQ16-BMS","price":1700.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/FoxESSCQ16BMSControlBox.jpg?v=1784038241","url":"https:\/\/qualityheating.co.uk\/products\/fox-ess-cq16-bms-control-box-high-voltage-battery-management-system-for-cq16-storage-systems","provider":"AIZO Quality Heating","version":"1.0","type":"link"}