Residential All-in-One ESS Reference Design
An illustrative control board reference design for residential all-in-one ESS units (PV + battery + EPS) on the PV generation side: the 48 V low-voltage battery exchanges charge / discharge limits with the BMS over CAN; RS-485 connects the meter for anti-backflow and parallel operation; current transformers sense the phase currents of the battery-side interleaved Buck-Boost; and the 90–120 W battery-side isolated auxiliary supply uses a planar transformer. Each position is marked with the VOOHU parts available, recommended part numbers and package pinouts.
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 CAN topology: the MCU UART is converted to a differential signal by isolated transceiver U2, then passes in turn the stage-2 clamp ESD D1 (WHALD30E2B) and the signal-line common-mode choke L1 (WHAC-3225B-510U0) to RJ45 J1; the isolated side of the transceiver is powered by the push-pull isolated supply. Termination / bias resistors depend on bus length and node count; they are drawn as symbols 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 BMS communication | BMS CAN RJ45 port | J1 | RJ45 Connector | WH56A31880021101 | VOOHU |
| 02 | A BMS communication | CAN CMC | L1 | Signal Line Common Mode Chokes | WHAC-3225B-510U0 | VOOHU |
| 03 | A BMS communication | CAN ESD / TVS | D1 | TVS ESD | WHALD30E2B | VOOHU |
| 04 | A BMS communication | Isolated CAN transceiver | U2 | — | — | Non-VOOHU |
| 05 | A BMS communication | Push-pull driver + rectifier / LDO | U4 | — | — | Non-VOOHU |
| 06 | A BMS communication | Push-pull isolation transformer | T1 | Push-Pull Transformers | WHST06K02A0 | VOOHU |
| 07 | B Meter / parallel operation | RS-485 RJ45 1×2 (meter / parallel operation) | J2 | RJ45 Connector | WH56I3288RGGG0121101 | VOOHU |
| 08 | B Meter / parallel operation | RS-485 GDT | GDT1 | GDT | WHGT090V1P0A | VOOHU |
| 09 | B Meter / parallel operation | RS-485 CMC | L2 | Signal Line Common Mode Chokes | WHAC-4532A-510U0 | VOOHU |
| 10 | B Meter / parallel operation | RS-485 ESD / TVS | D2 | TVS ESD | WHALD30E2B | VOOHU |
| 11 | B Meter / parallel operation | Isolated RS-485 transceiver | U3 | — | — | Non-VOOHU |
| 12 | C Battery-side power | Battery-side phase current transformer | T2 | Current Transformers | WHPT-ER115-006 | VOOHU |
| 13 | C Battery-side power | Current-sense conditioning | U6 | — | — | Non-VOOHU |
| 14 | C Battery-side power | Isolated DC-DC controller (48 V → 12 V) | U7 | — | — | Non-VOOHU |
| 15 | C Battery-side power | Planar transformer (battery-side isolated auxiliary power) | T3 | Planar Transformers | WHPT-EQ200-021 | VOOHU |
| 16 | D Control core | DSP (MPPT + bidirectional conversion + EPS control) | U1 | — | — | Non-VOOHU |
| 17 | E 48 V battery power input | Battery 48 V power input terminal | J3 | — | — | Non-VOOHU |
| 18 | E 48 V battery power input | Input power-line common-mode choke | L3 | Power Line Common Mode Chokes | WHAL-9070A-301T0 | VOOHU |
| 19 | E 48 V battery power input | Wide-input buck converter (48 V → 5 V) | U8 | — | — | Non-VOOHU |
| 20 | E 48 V battery power input | Buck converter (5 V → 3.3 V / core) | U9 | — | — | Non-VOOHU |
| 21 | E 48 V battery power input | Molded inductors ×2 (DC-DC) | L4 L5 | Molded Inductors | WHYT0630 Series | VOOHU |
Resources & downloads
Board bill of materials
Reference designators, zones, VOOHU categories, recommended parts and availability for all 21 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 residential All-in-One ESS reference design full package
Includes the full-board position list, datasheets for the recommended VOOHU parts and position-by-position selection notes. For advice tailored to your battery voltage (48 V low-voltage / high-voltage battery), BMS protocol or EPS power, please include it in your requirements. We reply within 24 hours on working days.
