{"product_id":"the-grid-ledger-din-rail-energy-meter","title":"The Grid Ledger | DIN-Rail Energy Meter with MODBUS RS485, Single and Three Phase","description":"\u003cdiv class=\"product-narrative\"\u003e\n\u003cp\u003e\u003cstrong\u003eIf It Is Not Measured, It Is Not Managed.\u003c\/strong\u003e Every electricity decision a business makes, whether to size a solar array, to bill a tenant, to find the machine that runs hot on the night shift, or to prove a saving to an investor, begins with the same missing number. Utility bills arrive monthly, aggregated, anonymous. They tell you what the building did, never what the process inside it did. A metering layer converts that silence into a ledger, and a ledger is the difference between an opinion about energy and a fact about it.\u003c\/p\u003e\n\u003cp\u003eThis is a DIN-rail meter family, not a single part. The DDSU666 covers single-phase loads up to 80A direct, the DTSU666 handles three-phase service with current-transformer inputs at 100A, 150A, 200A, 250A and 300A, and the DTSU666-H adds three CTs for three-phase circuits. The SDM230, SDM630MCT, YDS60-C24 and YDS70-C16 models in the same listing give you the form factors that fit existing panels. Every unit reports voltage, current, power and cumulative energy over MODBUS RS485, which is the one protocol a building management system, a Home Assistant instance, an EMQX broker and an industrial PLC all already speak. Wiring is terminal-block, the enclosure is alloy, and mounting is a standard rail clip.\u003c\/p\u003e\n\u003cp\u003eRead the compatibility line before you buy. These meters are designed for general AC metering at 230V single phase and 380V three phase, and the listing is explicit that they are not validated for the inverter ecosystems of Solax, Sofar, Sungrow, Growatt, Huawei, Deye, Hoymiles or Goodwe. Panel builders, tenant sub-metering projects, hotel load audits and retrofits where the meter has to fit an already-crowded rail are the intended home for this hardware.\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003eA number on a rail is worth more than a story about the bill.\u003c\/em\u003e\u003c\/p\u003e\n\u003c\/div\u003e\u003chr style=\"margin: 20px 0; border: 0; border-top: 1px solid #eee;\"\u003e\u003cdiv class=\"product-features\"\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul style=\"list-style: none; padding: 0;\"\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f0f0f0;\"\u003e✦ DIN-rail mounting with terminal-block wiring, sized for standard distribution panels\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f0f0f0;\"\u003e✦ Direct 80A measurement in single phase, CT input from 100A to 300A in three phase\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f0f0f0;\"\u003e✦ MODBUS RS485 output, readable by BMS platforms, PLCs, brokers and open-source dashboards\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f0f0f0;\"\u003e✦ Measures voltage, current, active power and cumulative kWh energy\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f0f0f0;\"\u003e✦ Multi-model listing: DDSU666, DTSU666, DTSU666-H, DDSU666-H, SDM230, SDM630MCT, YDS60-C24 and YDS70-C16\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f0f0f0;\"\u003e✦ Supports 230V single-phase and 380V three-phase service configurations\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f0f0f0;\"\u003e✦ Alloy housing with the seal and stability expected in a panel installation\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f0f0f0;\"\u003e✦ Explicit compatibility notice published on the listing, so unsuitable inverter pairings are avoided before purchase\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\u003chr style=\"margin: 20px 0; border: 0; border-top: 1px solid #eee;\"\u003e\u003cdiv class=\"product-specs\"\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul style=\"list-style: none; padding: 0;\"\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f0f0f0;\"\u003e\n\u003cstrong\u003eFunction:\u003c\/strong\u003e Digital voltmeter, ammeter, power and cumulative energy meter\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f0f0f0;\"\u003e\n\u003cstrong\u003eMounting:\u003c\/strong\u003e DIN rail, terminal-block connections\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f0f0f0;\"\u003e\n\u003cstrong\u003eProtocol:\u003c\/strong\u003e MODBUS over RS485\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f0f0f0;\"\u003e\n\u003cstrong\u003eSingle-Phase Model:\u003c\/strong\u003e DDSU666, 80A direct connection\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f0f0f0;\"\u003e\n\u003cstrong\u003eThree-Phase Models:\u003c\/strong\u003e DTSU666 and DTSU666-H with CT inputs, 100A, 150A, 200A, 250A and 300A\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f0f0f0;\"\u003e\n\u003cstrong\u003eAlternative Models:\u003c\/strong\u003e DDSU666-H, SDM230, SDM630MCT, YDS60-C24, YDS70-C16\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f0f0f0;\"\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e AC 230V single phase, AC 380V three phase\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f0f0f0;\"\u003e\n\u003cstrong\u003eMeasured Values:\u003c\/strong\u003e Voltage, current, power, energy\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f0f0f0;\"\u003e\n\u003cstrong\u003eHousing Material:\u003c\/strong\u003e Alloy\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f0f0f0;\"\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e CHINT \/ CHNT\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f0f0f0;\"\u003e\n\u003cstrong\u003eNot Validated With:\u003c\/strong\u003e Solax, Sofar, Sungrow, Growatt, Huawei, Deye, Hoymiles and Goodwe inverter ecosystems\u003c\/li\u003e\n\u003cli style=\"padding: 8px 0; border-bottom: 1px solid #f0f0f0;\"\u003e\n\u003cstrong\u003ePrice Range:\u003c\/strong\u003e Entry single-phase unit through to three-CT three-phase kits\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\u003chr style=\"margin: 20px 0; border: 0; border-top: 1px solid #eee;\"\u003e\u003cdiv class=\"product-applications\"\u003e\n\u003ch3\u003eWhere It Belongs\u003c\/h3\u003e\n\u003cp\u003eThis meter belongs in the parts of a building where energy becomes accountable. A landlord sub-metering commercial units needs a reading per tenant, not a reading per building. A fabrication shop wants to know which machine is the expensive one, so a rail meter goes in the feed to each bench. Hotels and laundries use them to separate house loads from kitchen loads. Solar installers use them behind the inverter to verify generation against consumption, except on the inverter brands the listing rules out. Facilities teams use them as the evidence layer for retrofit savings. If a process consumes power on a circuit, a DIN-rail meter on that circuit converts the wire into a data source.\u003c\/p\u003e\n\u003c\/div\u003e\u003chr style=\"margin: 20px 0; border: 0; border-top: 1px solid #eee;\"\u003e\u003cdiv class=\"product-faq\"\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cdiv style=\"margin-bottom: 15px;\"\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Which model do I need for a three-phase supply?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eChoose a DTSU666 or DTSU666-H variant and match the CT rating to your load. The 3CT models include three current transformers in the 100A, 150A, 200A, 250A and 300A ratings listed.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 15px;\"\u003e\n\u003cp\u003e\u003cstrong\u003eQ: How do I read the data into a dashboard or BMS?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe meter speaks MODBUS over RS485. Connect the A and B pair to your RS485 bus and poll the meter registers from a PLC, a BMS, a gateway, or an open-source energy dashboard.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 15px;\"\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Will it work with my Growatt or Solax inverter?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNo. The listing states clearly that these meters are not for Solax, Sofar, Sungrow, Growatt, Huawei, Deye, Hoymiles or Goodwe installations. Use the inverter manufacturer own metering for those systems.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 15px;\"\u003e\n\u003cp\u003e\u003cstrong\u003eQ: Is the 80A version direct-connected?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eYes. The DDSU666 80A variant measures the load directly without external current transformers, which keeps the panel wiring simple at that rating.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 15px;\"\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What mounting space does it take?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIt clips to a standard DIN rail and wires through terminal blocks, so it fits the same rail as the breakers and contactors already in the panel.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"margin-bottom: 15px;\"\u003e\n\u003cp\u003e\u003cstrong\u003eQ: What is in the box?\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eOne meter, with current transformers included on the three-phase CT models as listed. CT leads and signal wiring are supplied as part of the metering kit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\u003chr style=\"margin: 20px 0; border: 0; border-top: 1px solid #eee;\"\u003e\u003cdiv class=\"product-promise\" style=\"background: #fafafa; padding: 18px 20px; border-left: 3px solid #1a1a2e;\"\u003e\n\u003ch3 style=\"margin-top: 0;\"\u003eThe EastSupplier Promise\u003c\/h3\u003e\n\u003cp\u003eEvery unit is inspected before it leaves the warehouse. If a specification on this page does not match what arrives, we cover the return shipping and replace it. English-language support answers within one business day, and replacement parts for this category are stocked so that a working unit stays working.\u003c\/p\u003e\n\u003c\/div\u003e\u003cdiv class=\"product-gallery\" style=\"margin-top: 30px; text-align: center;\"\u003e\n\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/Sc24d1c18325e463dae48cf58be72ac20S.webp?v=1743985917\" alt=\"The Grid Ledger\" style=\"max-width: 100%; height: auto; margin: 8px 0; border-radius: 6px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/S17f19a3d3de14f9a87675d1824ef61735.webp?v=1743985917\" alt=\"The Grid Ledger\" style=\"max-width: 100%; height: auto; margin: 8px 0; border-radius: 6px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/S1153a9c6d7ce4c19896c6aa9a3876cd6r.webp?v=1743985917\" alt=\"The Grid Ledger\" style=\"max-width: 100%; height: auto; margin: 8px 0; border-radius: 6px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/Sc2cc53c687e84384ab7fb79b6f68f16bz.webp?v=1743985917\" alt=\"The Grid Ledger\" style=\"max-width: 100%; height: auto; margin: 8px 0; border-radius: 6px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/S2dd7cd89b61a47bb906d89d7c9b46cadP.webp?v=1743985917\" alt=\"The Grid Ledger\" style=\"max-width: 100%; height: auto; margin: 8px 0; border-radius: 6px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/S33b59d31fa264a6286b12123979d3622u.webp?v=1743985917\" alt=\"The Grid Ledger\" style=\"max-width: 100%; height: auto; margin: 8px 0; border-radius: 6px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/Sb1071edab15c4f4897672fd7ea942e01l.webp?v=1743985917\" alt=\"The Grid Ledger\" style=\"max-width: 100%; height: auto; margin: 8px 0; border-radius: 6px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/S3823a72e78d048ef89a21b2f50a76dd4C.webp?v=1743985917\" alt=\"The Grid Ledger\" style=\"max-width: 100%; height: auto; margin: 8px 0; border-radius: 6px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0503\/6412\/1244\/files\/Sc68154767a1c40f4a2d79c99cf1d2109O.webp?v=1743985917\" alt=\"The Grid Ledger\" style=\"max-width: 100%; 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