{"product_id":"viridian-ct-clamp-for-clearline-inverter-vir-csi-ct-export-power-limiting-dno-compliance-g98-g99-export-cap-requires-vir-csi-wifi","title":"Viridian CT Clamp for Clearline Inverter | VIR-CSI-CT | Export Power Limiting | DNO Compliance | G98 G99 Export Cap | Requires VIR-CSI-WIFI","description":"\u003cdiv style=\"font-family:inherit;font-size:16px;line-height:1.65;color:#1a1a1a;\"\u003e\n\u003cp style=\"margin-bottom:1.25rem;line-height:2.2;\"\u003e\n\u003cspan style=\"display:inline-block;background:#c0392b;color:#ffffff;border:1.5px solid #c0392b;border-radius:4px;padding:3px 10px;font-size:11px;font-weight:700;letter-spacing:.05em;text-transform:uppercase;line-height:1.6;margin-right:5px;margin-bottom:5px;\"\u003eExport Power Limiting\u003c\/span\u003e\n\u003cspan style=\"display:inline-block;background:#1d4d1d;color:#ffffff;border:1.5px solid #1d4d1d;border-radius:4px;padding:3px 10px;font-size:11px;font-weight:700;letter-spacing:.05em;text-transform:uppercase;line-height:1.6;margin-right:5px;margin-bottom:5px;\"\u003eDNO Compliance\u003c\/span\u003e\n\u003cspan style=\"display:inline-block;background:#2e6e2e;color:#ffffff;border:1.5px solid #2e6e2e;border-radius:4px;padding:3px 10px;font-size:11px;font-weight:700;letter-spacing:.05em;text-transform:uppercase;line-height:1.6;margin-right:5px;margin-bottom:5px;\"\u003eGrid Import\/Export Meter\u003c\/span\u003e\n\u003cspan style=\"display:inline-block;background:#e8850a;color:#ffffff;border:1.5px solid #e8850a;border-radius:4px;padding:3px 10px;font-size:11px;font-weight:700;letter-spacing:.05em;text-transform:uppercase;line-height:1.6;margin-right:5px;margin-bottom:5px;\"\u003eClearline Inverter Add-On\u003c\/span\u003e\n\u003cspan style=\"display:inline-block;background:#555555;color:#ffffff;border:1.5px solid #555555;border-radius:4px;padding:3px 10px;font-size:11px;font-weight:700;letter-spacing:.05em;text-transform:uppercase;line-height:1.6;margin-right:5px;margin-bottom:5px;\"\u003eRequires WiFi Module\u003c\/span\u003e\n\u003cspan style=\"display:inline-block;background:#ffffff;color:#2e6e2e;border:1.5px solid #2e6e2e;border-radius:4px;padding:3px 10px;font-size:11px;font-weight:700;letter-spacing:.05em;text-transform:uppercase;line-height:1.6;margin-right:5px;margin-bottom:5px;\"\u003eViridian Solar\u003c\/span\u003e\n\u003c\/p\u003e\n\u003cp style=\"font-size:15.5px;color:#2a2a2a;margin-bottom:1.4rem;line-height:1.8;\"\u003eThe \u003cstrong style=\"color:#1d4d1d;\"\u003eViridian CT Clamp for Clearline Inverter\u003c\/strong\u003e (VIR-CSI-CT) is the current transformer accessory that enables \u003cstrong style=\"color:#1d4d1d;\"\u003eexport power limiting\u003c\/strong\u003e on Clearline CSI inverters. Installed on the main grid supply cable in the consumer unit, it continuously measures the real-time power flow at the grid connection point and sends this data to the inverter, which dynamically adjusts its output to stay within a configured maximum export limit. This is essential where your \u003cstrong style=\"color:#1d4d1d;\"\u003eDNO (Distribution Network Operator) connection approval specifies a maximum permitted export\u003c\/strong\u003e — for example, a G98 approval with a 3.68 kW export cap or a G99 approval with a specific export level. The CT clamp \u003cstrong style=\"color:#1d4d1d;\"\u003emust be used alongside the VIR-CSI-WIFI WiFi module\u003c\/strong\u003e — both are required for the export limiting function to operate.\u003c\/p\u003e\n\u003cp style=\"background:#fdf0ed;border-left:4px solid #c0392b;border-radius:0 6px 6px 0;padding:.85rem 1.15rem;margin:.9rem 0;font-size:14.5px;line-height:1.7;color:#4a0800;\"\u003e🔴 \u003cstrong style=\"color:#1d4d1d;\"\u003eImportant:\u003c\/strong\u003e The CT clamp must be installed on the \u003cstrong style=\"color:#1d4d1d;\"\u003egrid supply cable\u003c\/strong\u003e (the live conductor between the electricity meter and the consumer unit) by a \u003cstrong style=\"color:#1d4d1d;\"\u003equalified electrician\u003c\/strong\u003e. Incorrect installation will result in incorrect export measurement and may cause the inverter to export more power than permitted. \u003cstrong style=\"color:#1d4d1d;\"\u003eBoth VIR-CSI-WIFI and VIR-CSI-CT are required for export limiting — neither works for this purpose without the other.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp style=\"font-size:10.5px;font-weight:800;letter-spacing:.14em;text-transform:uppercase;color:#2e6e2e;margin-top:1.7rem;margin-bottom:.55rem;padding-bottom:4px;border-bottom:2px solid #2e6e2e;\"\u003eKey Features\u003c\/p\u003e\n\u003cul style=\"list-style:none;padding:0;margin:0 0 1.4rem 0;\"\u003e\n  \u003cli style=\"padding:5px 0 5px 22px;position:relative;font-size:15px;line-height:1.65;\"\u003e\n\u003cspan style=\"position:absolute;left:0;color:#2e6e2e;font-weight:800;\"\u003e✓\u003c\/span\u003e\u003cstrong style=\"color:#1d4d1d;\"\u003eEnables export power limiting\u003c\/strong\u003e on any Clearline CSI inverter — essential for DNO compliance where a maximum export cap is specified in your G98\/G99 connection approval\u003c\/li\u003e\n  \u003cli style=\"padding:5px 0 5px 22px;position:relative;font-size:15px;line-height:1.65;\"\u003e\n\u003cspan style=\"position:absolute;left:0;color:#2e6e2e;font-weight:800;\"\u003e✓\u003c\/span\u003e\u003cstrong style=\"color:#1d4d1d;\"\u003eClamp-on installation\u003c\/strong\u003e — clips around the live (or neutral) grid supply conductor; no need to cut or splice the cable, minimising installation time\u003c\/li\u003e\n  \u003cli style=\"padding:5px 0 5px 22px;position:relative;font-size:15px;line-height:1.65;\"\u003e\n\u003cspan style=\"position:absolute;left:0;color:#2e6e2e;font-weight:800;\"\u003e✓\u003c\/span\u003e\u003cstrong style=\"color:#1d4d1d;\"\u003eConnects to the inverter's RS485\/CT communication port\u003c\/strong\u003e — dedicated port on all Clearline CSI models; no external data logger or meter required\u003c\/li\u003e\n  \u003cli style=\"padding:5px 0 5px 22px;position:relative;font-size:15px;line-height:1.65;\"\u003e\n\u003cspan style=\"position:absolute;left:0;color:#2e6e2e;font-weight:800;\"\u003e✓\u003c\/span\u003e\u003cstrong style=\"color:#1d4d1d;\"\u003eContinuous real-time measurement\u003c\/strong\u003e — the inverter reads the CT output many times per second and adjusts its AC output power in real time to maintain the export set-point\u003c\/li\u003e\n  \u003cli style=\"padding:5px 0 5px 22px;position:relative;font-size:15px;line-height:1.65;\"\u003e\n\u003cspan style=\"position:absolute;left:0;color:#2e6e2e;font-weight:800;\"\u003e✓\u003c\/span\u003e\u003cstrong style=\"color:#1d4d1d;\"\u003eSet export limit via WE Mate app\u003c\/strong\u003e — the installer configures the target export power level (in watts) under Advanced Settings → Power Limit; the inverter maintains this limit automatically\u003c\/li\u003e\n  \u003cli style=\"padding:5px 0 5px 22px;position:relative;font-size:15px;line-height:1.65;\"\u003e\n\u003cspan style=\"position:absolute;left:0;color:#2e6e2e;font-weight:800;\"\u003e✓\u003c\/span\u003e\u003cstrong style=\"color:#1d4d1d;\"\u003eZero-export operation\u003c\/strong\u003e — set the export limit to 0 W if your DNO or DNO approval requires no export at all (self-consumption only mode)\u003c\/li\u003e\n  \u003cli style=\"padding:5px 0 5px 22px;position:relative;font-size:15px;line-height:1.65;\"\u003e\n\u003cspan style=\"position:absolute;left:0;color:#2e6e2e;font-weight:800;\"\u003e✓\u003c\/span\u003e\u003cstrong style=\"color:#1d4d1d;\"\u003eWorks with all Clearline CSI models\u003c\/strong\u003e — compatible with all single-phase Clearline inverters from CSI1000S through CSI6000D\u003c\/li\u003e\n  \u003cli style=\"padding:5px 0 5px 22px;position:relative;font-size:15px;line-height:1.65;\"\u003e\n\u003cspan style=\"position:absolute;left:0;color:#2e6e2e;font-weight:800;\"\u003e✓\u003c\/span\u003e\u003cstrong style=\"color:#1d4d1d;\"\u003eMust be used with VIR-CSI-WIFI or VIR-CSI-WIFI-S\u003c\/strong\u003e — the WiFi module provides the communication pathway between the CT clamp reading and the inverter's power control algorithm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"font-size:10.5px;font-weight:800;letter-spacing:.14em;text-transform:uppercase;color:#2e6e2e;margin-top:1.7rem;margin-bottom:.55rem;padding-bottom:4px;border-bottom:2px solid #2e6e2e;\"\u003eWhen Do I Need a CT Clamp?\u003c\/p\u003e\n\u003cp style=\"background:#fef3e2;border-left:4px solid #e8850a;border-radius:0 6px 6px 0;padding:.85rem 1.15rem;margin:.9rem 0;font-size:14.5px;line-height:1.7;color:#4a2800;\"\u003e\u003cstrong style=\"color:#1d4d1d;\"\u003eYou need the CT clamp if your DNO connection approval (G98 or G99) includes any of the following:\u003c\/strong\u003e\n\n• A maximum permitted export power (e.g. 3.68 kW, 2 kW, or 0 kW)\n• A requirement for export limiting or zero-export operation\n• A condition that inverter output must be curtailed based on grid conditions\n\nIf your connection approval has no export restriction, the CT clamp is not required. Check your DNO connection offer letter or consult your MCS installer for guidance.\u003c\/p\u003e\n\u003cp style=\"font-size:10.5px;font-weight:800;letter-spacing:.14em;text-transform:uppercase;color:#2e6e2e;margin-top:1.7rem;margin-bottom:.55rem;padding-bottom:4px;border-bottom:2px solid #2e6e2e;\"\u003eTechnical Specifications\u003c\/p\u003e\n\u003cdiv style=\"overflow-x:auto;margin-bottom:1.5rem;\"\u003e\u003ctable style=\"width:100%;border-collapse:collapse;font-size:13.5px;min-width:360px;\"\u003e\n\u003ctr\u003e\n\u003cth style=\"background:#1d4d1d;color:#ffffff;font-weight:700;text-align:left;padding:7px 11px;\"\u003eSpecification\u003c\/th\u003e\n\u003cth style=\"background:#1d4d1d;color:#ffffff;font-weight:700;text-align:left;padding:7px 11px;\"\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:7px 11px;border-bottom:1px solid #c8e6c8;vertical-align:top;background:#ffffff;font-weight:600;color:#1d4d1d;\"\u003eFunction\u003c\/td\u003e\n\u003ctd style=\"padding:7px 11px;border-bottom:1px solid #c8e6c8;vertical-align:top;background:#ffffff;\"\u003eCurrent transformer for real-time grid import\/export measurement\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:7px 11px;border-bottom:1px solid #c8e6c8;vertical-align:top;background:#e8f5e8;font-weight:600;color:#1d4d1d;\"\u003eInstallation Point\u003c\/td\u003e\n\u003ctd style=\"padding:7px 11px;border-bottom:1px solid #c8e6c8;vertical-align:top;background:#e8f5e8;\"\u003eGrid supply cable between electricity meter and consumer unit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:7px 11px;border-bottom:1px solid #c8e6c8;vertical-align:top;background:#ffffff;font-weight:600;color:#1d4d1d;\"\u003eInstallation Method\u003c\/td\u003e\n\u003ctd style=\"padding:7px 11px;border-bottom:1px solid #c8e6c8;vertical-align:top;background:#ffffff;\"\u003eClamp-on (split-core CT) — no cable cutting required\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:7px 11px;border-bottom:1px solid #c8e6c8;vertical-align:top;background:#e8f5e8;font-weight:600;color:#1d4d1d;\"\u003eConnection to Inverter\u003c\/td\u003e\n\u003ctd style=\"padding:7px 11px;border-bottom:1px solid #c8e6c8;vertical-align:top;background:#e8f5e8;\"\u003eRS485 \/ CT communication port (COM port 2 on all Clearline CSI models)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:7px 11px;border-bottom:1px solid #c8e6c8;vertical-align:top;background:#ffffff;font-weight:600;color:#1d4d1d;\"\u003eRequired Companion\u003c\/td\u003e\n\u003ctd style=\"padding:7px 11px;border-bottom:1px solid #c8e6c8;vertical-align:top;background:#ffffff;\"\u003eVIR-CSI-WIFI or VIR-CSI-WIFI-S WiFi module (must be fitted for export limiting to function)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:7px 11px;border-bottom:1px solid #c8e6c8;vertical-align:top;background:#e8f5e8;font-weight:600;color:#1d4d1d;\"\u003eConfiguration\u003c\/td\u003e\n\u003ctd style=\"padding:7px 11px;border-bottom:1px solid #c8e6c8;vertical-align:top;background:#e8f5e8;\"\u003eVia WE Mate app — Advanced Settings → Power Limit → Enable Power Limit → Set Export Power and CT Ratio\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:7px 11px;border-bottom:1px solid #c8e6c8;vertical-align:top;background:#ffffff;font-weight:600;color:#1d4d1d;\"\u003eCompatible Inverters\u003c\/td\u003e\n\u003ctd style=\"padding:7px 11px;border-bottom:1px solid #c8e6c8;vertical-align:top;background:#ffffff;\"\u003eAll Viridian Clearline CSI range (CSI1000S–CSI6000D)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:7px 11px;border-bottom:1px solid #c8e6c8;vertical-align:top;background:#e8f5e8;font-weight:600;color:#1d4d1d;\"\u003eInstaller Requirement\u003c\/td\u003e\n\u003ctd style=\"padding:7px 11px;border-bottom:1px solid #c8e6c8;vertical-align:top;background:#e8f5e8;\"\u003eQualified electrician — installation at consumer unit level involves live equipment\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:7px 11px;border-bottom:1px solid #c8e6c8;vertical-align:top;background:#ffffff;font-weight:600;color:#1d4d1d;\"\u003eManufacturer\u003c\/td\u003e\n\u003ctd style=\"padding:7px 11px;border-bottom:1px solid #c8e6c8;vertical-align:top;background:#ffffff;\"\u003eViridian Solar Ltd, Papworth, Cambridge\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\u003cp style=\"font-size:10.5px;font-weight:800;letter-spacing:.14em;text-transform:uppercase;color:#2e6e2e;margin-top:1.7rem;margin-bottom:.55rem;padding-bottom:4px;border-bottom:2px solid #2e6e2e;\"\u003eFrequently Asked Questions\u003c\/p\u003e\n\u003cp style=\"border-bottom:1px solid #c8e6c8;padding:.85rem 0 .85rem 1.4rem;position:relative;margin:0;\"\u003e\u003cspan style=\"position:absolute;left:0;top:.85rem;color:#2e6e2e;font-weight:900;font-size:14.5px;\"\u003eQ\u003c\/span\u003e\u003cstrong style=\"color:#1d4d1d;font-size:14.5px;\"\u003eDo I need a CT clamp if my DNO approval has no export restriction?\u003c\/strong\u003e\u003cbr\u003e\u003cspan style=\"font-size:14px;color:#2a2a2a;line-height:1.7;\"\u003eNo. If your G98 or G99 connection approval places no restriction on export power, the CT clamp is not needed. Most simple domestic G98 systems under 3.68 kW can export freely. Check your DNO connection offer document to confirm whether an export limit applies.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"border-bottom:1px solid #c8e6c8;padding:.85rem 0 .85rem 1.4rem;position:relative;margin:0;\"\u003e\u003cspan style=\"position:absolute;left:0;top:.85rem;color:#2e6e2e;font-weight:900;font-size:14.5px;\"\u003eQ\u003c\/span\u003e\u003cstrong style=\"color:#1d4d1d;font-size:14.5px;\"\u003eCan I use the CT clamp without the WiFi module?\u003c\/strong\u003e\u003cbr\u003e\u003cspan style=\"font-size:14px;color:#2a2a2a;line-height:1.7;\"\u003eNo. \u003cstrong style=\"color:#1d4d1d;\"\u003eBoth the VIR-CSI-CT and VIR-CSI-WIFI are required together for export limiting.\u003c\/strong\u003e The CT clamp measures the current; the WiFi module communicates that measurement to the inverter's control system. Without the WiFi module, the inverter cannot read the CT clamp data.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"border-bottom:1px solid #c8e6c8;padding:.85rem 0 .85rem 1.4rem;position:relative;margin:0;\"\u003e\u003cspan style=\"position:absolute;left:0;top:.85rem;color:#2e6e2e;font-weight:900;font-size:14.5px;\"\u003eQ\u003c\/span\u003e\u003cstrong style=\"color:#1d4d1d;font-size:14.5px;\"\u003eWhere exactly is the CT clamp installed?\u003c\/strong\u003e\u003cbr\u003e\u003cspan style=\"font-size:14px;color:#2a2a2a;line-height:1.7;\"\u003eThe CT clamp is installed on the \u003cstrong style=\"color:#1d4d1d;\"\u003emain grid supply conductor\u003c\/strong\u003e — typically the live (line) cable between your electricity meter and the main consumer unit. This allows it to measure the total power flowing to or from the grid (import and export). Installation at this point must be carried out by a qualified electrician.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"border-bottom:1px solid #c8e6c8;padding:.85rem 0 .85rem 1.4rem;position:relative;margin:0;\"\u003e\u003cspan style=\"position:absolute;left:0;top:.85rem;color:#2e6e2e;font-weight:900;font-size:14.5px;\"\u003eQ\u003c\/span\u003e\u003cstrong style=\"color:#1d4d1d;font-size:14.5px;\"\u003eCan I set zero export (self-consumption only)?\u003c\/strong\u003e\u003cbr\u003e\u003cspan style=\"font-size:14px;color:#2a2a2a;line-height:1.7;\"\u003eYes. Set the export limit to \u003cstrong style=\"color:#1d4d1d;\"\u003e0 W\u003c\/strong\u003e in the WE Mate app under Advanced Settings → Power Limit. The inverter will then continuously adjust its output to match household consumption, preventing any power from flowing back to the grid. Note that zero-export operation cannot be guaranteed under all dynamic conditions — response time means small transient exports may occasionally occur; this is normal and accepted by most DNOs.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp style=\"border-bottom:1px solid #c8e6c8;padding:.85rem 0 .85rem 1.4rem;position:relative;margin:0;\"\u003e\u003cspan style=\"position:absolute;left:0;top:.85rem;color:#2e6e2e;font-weight:900;font-size:14.5px;\"\u003eQ\u003c\/span\u003e\u003cstrong style=\"color:#1d4d1d;font-size:14.5px;\"\u003eWhat happens if the CT clamp cable is disconnected after commissioning?\u003c\/strong\u003e\u003cbr\u003e\u003cspan style=\"font-size:14px;color:#2a2a2a;line-height:1.7;\"\u003eIf the CT clamp communication is lost, the inverter will typically fall back to outputting at its unrestricted rated power. This may cause an export limit breach. Ensure the CT cable is routed and secured to avoid accidental disconnection, and check the WE Mate app for any communication fault alerts.\u003c\/span\u003e\u003c\/p\u003e\n\n\u003c\/div\u003e","brand":"Viridian Solar","offers":[{"title":"Default Title","offer_id":63646266294621,"sku":"VIR-CSI-CT","price":69.0,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0958\/2051\/3629\/files\/Fox-ESS-CT-Clampwithcable.jpg?v=1765171650","url":"https:\/\/qualityheating.co.uk\/products\/viridian-ct-clamp-for-clearline-inverter-vir-csi-ct-export-power-limiting-dno-compliance-g98-g99-export-cap-requires-vir-csi-wifi","provider":"AIZO Quality Heating","version":"1.0","type":"link"}