ESS Transformer / Grid-Tie Cabinet Reference Design
An illustrative reference design for the monitoring & control unit of the storage-side step-up grid-tie unit in PV & ESS (0.4 / 10 kV ESS transformer and grid-tie cabinet): it acquires binary inputs such as breaker open / closed position, transformer temperature controller and door contacts, drives shunt-trip / alarm relays, communicates with protection devices / temperature controllers over isolated RS-485 and reports to the EMS over Ethernet (Modbus TCP / IEC 104); powered from 24 V inside the cabinet. The current transformers for power-frequency metering and protection are external standard parts (5 A / 1 A secondary) and are not on this board.
Illustrative PCB ⇄ Schematic
Illustrative top-side view arranged by functional zone (not the actual layout). Red numbered dots mark positions VOOHU can supply. Click a component on the board, an entry in the index below or a part in the schematic to see recommended parts and package pinouts on the right.
Illustrative RS-485 topology: the MCU UART is converted to a differential signal by isolated transceiver U2, then passes the stage-2 clamp ESD D1 (WHALD30E2B), the signal-line common-mode choke L1 (WHAC-4532A-510U0) and the stage-1 three-pole gas discharge tube GDT1 (WHGT090V1P0A, center electrode to chassis ground) to terminal J1; the transceiver's isolated side is powered by the push-pull isolated supply. Termination / bias resistors depend on bus length and node count; only their symbols are drawn, without values.
Board bill of materials
Summarized by position; click any row to locate it on the board above.
| No. | Zone | Position | Ref. | VOOHU category | Recommended part | Availability |
|---|---|---|---|---|---|---|
| 01 | A RS-485 (isolated) | RS-485 terminals ×2 (protection device / temperature controller) | J1 | — | — | Non-VOOHU |
| 02 | A RS-485 (isolated) | RS-485 GDT ×2 | GDT1 | GDT | WHGT090V1P0A | VOOHU |
| 03 | A RS-485 (isolated) | RS-485 CMC ×2 | L1 | Signal Line Common Mode Chokes | WHAC-4532A-510U0 | VOOHU |
| 04 | A RS-485 (isolated) | RS-485 ESD / TVS ×2 | D1 | TVS ESD | WHALD30E2B | VOOHU |
| 05 | A RS-485 (isolated) | Isolated RS-485 transceiver ×2 | U2 | — | — | Non-VOOHU |
| 06 | A RS-485 (isolated) | Push-pull driver + rectifier / LDO | U3 | — | — | Non-VOOHU |
| 07 | A RS-485 (isolated) | Push-pull isolation transformer | T1 | Push-Pull Transformers | WHST06K02A0 | VOOHU |
| 08 | B Ethernet | RJ45 port (EMS / IEC 104) | J2 | RJ45 Connector | WH56A31882021103 | VOOHU |
| 09 | B Ethernet | Ethernet port gas discharge tube | GDT2 | GDT | WHGD090V1P0B | VOOHU |
| 10 | B Ethernet | 10/100 LAN transformer (high isolation) | T2 | LAN Transformers | WHSH16F01D4 | VOOHU |
| 11 | B Ethernet | Eth ESD array | D2 | TVS ESD | WHALD03G4U | VOOHU |
| 12 | B Ethernet | 10/100 PHY | U4 | Ethernet PHY | JL1101BR-NI | VOOHU |
| 13 | C DI / relays | Binary input terminal | J3 | — | — | Non-VOOHU |
| 14 | C DI / relays | DI ESD | D3 | TVS ESD | WHALD30E2B | VOOHU |
| 15 | C DI / relays | Optocoupler-isolated inputs | U5 | — | — | Non-VOOHU |
| 16 | C DI / relays | Relay output terminal | J4 | — | — | Non-VOOHU |
| 17 | C DI / relays | Relays ×N | K1 | — | — | Non-VOOHU |
| 18 | C DI / relays | Relay driver | U6 | — | — | Non-VOOHU |
| 19 | D Control core | MCU (measurement & control + protocols) | U1 | — | — | Non-VOOHU |
| 20 | E 24 V power | 24 V in-cabinet power terminal | J5 | — | — | Non-VOOHU |
| 21 | E 24 V power | Bidirectional input TVS | D4 | TVS ESD | WHTB058VA | VOOHU |
| 22 | E 24 V power | Input power-line common-mode choke | L2 | Power Line Common Mode Chokes | WHAL-7060A-102T0 | VOOHU |
| 23 | E 24 V power | Buck converter (24 V → 5 V) | U7 | — | — | Non-VOOHU |
| 24 | E 24 V power | Buck converter (5 V → 3.3 V / core) | U8 | — | — | Non-VOOHU |
| 25 | E 24 V power | Molded inductors ×2 (DC-DC) | L3 L4 | Molded Inductors | WHYT0630 Series | VOOHU |
Resources & downloads
Board bill of materials
Reference designators, zones, VOOHU categories, recommended parts and availability for all 25 positions. Opens directly in Excel.
Datasheet collection
Datasheet PDFs for the VOOHU parts recommended on this board.
Design files & footprint library
Schematic, PCB, and VOOHU part footprints and 3D models.
Coming soonRequest the ESS transformer / Grid-Tie cabinet reference design full package
Includes the full-board position list, datasheets for the recommended VOOHU parts and position-by-position selection notes. For selection advice tailored to your number of binary I/O channels, communication protocol (Modbus / IEC 104 / IEC 61850) or in-cabinet EMC environment, please include it in your requirements. We reply within 24 hours on working days.
