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Electronics · 3S–32S Boards
Custom Smart BMS: Boards, Firmware & Protocols
In-house BMS engineering from 3S to 32S and 30A to 500A: UART, RS485, CAN and Bluetooth 5.0 with WiFi/4G cloud modules, OTA firmware updates, and protocol libraries mapped to the inverter brands you sell. Boards ship inside our own battery lines — and yours, with your protection thresholds, your connectors and your label.
Custom Smart BMS
Boards, Firmware & Protocols In-House
3S–32S boards at 30–500A with RS485, CAN, Bluetooth 5.0 and OTA firmware.
Line Overview
A BMS Team Inside a Battery Factory
Most pack factories buy protection boards from a broker and accept whatever firmware comes on them. We run BMS design in-house — schematic, PCB layout, firmware and protocol mapping — inside a 280+ engineer organization, because the boards protect the packs we warranty. That means your protection thresholds, balancing strategy and comms stack are engineering decisions we can defend with test data, not a supplier's catalog page.
- Coverage — 3S to 32S: 12V drop-ins through 72V light-electric packs and high-voltage LFP stacks, at 30–500A continuous with higher peak ratings.
- Communications — UART, RS485 and CAN running simultaneously with Bluetooth 5.0; WiFi and 4G modules where packs report to a cloud.
- Protection set — overcharge, overdischarge, overcurrent, short circuit, high temperature, low temperature and balancing, all threshold-programmable.
- Balancing — passive standard; active balancing at 1–5A for 280Ah-class stacks and drift-prone fleet duty.
- Firmware — OTA updates over WiFi/4G with local Bluetooth updates as fallback; white-label monitoring apps available.
Specifications
BMS Capability Matrix
| Parameter | Specification |
|---|---|
| Series range | 3S – 32S |
| Continuous current | 30 – 500A (higher peak ratings per design) |
| Communication | UART · RS485 · CAN · Bluetooth 5.0 — simultaneous BT + RS485 available |
| Wireless modules | WiFi and 4G for cloud-connected packs |
| Firmware updates | OTA over WiFi/4G · local update via Bluetooth |
| Protection functions | overcharge · overdischarge · overcurrent · short circuit · high temp · low temp · balancing |
| Balancing | passive standard · active 1–5A optional |
| Temperature sensing | multi-point NTC on cells and MOSFET bank |
| Protocol libraries | Deye · Victron · Growatt · Pylontech-compatible · SMA · Luxpower |
| Customization | PCB layout, connectors, wire harness, enclosure, register-level protocol mapping |
| Testing | 100% functional board test plus firmware-verified aging on pilot packs |
Protocol Ecosystem
Inverter Protocols Already on File
Each profile below is a register-level mapping our firmware team maintains: pack voltage and current, SOC and SOH reporting, cell-level alarms, and the charge-parameter handoff the inverter expects. If your target device is not on the list, send us a CAN capture from a sample unit and we map it.
Deye
Single- and three-phase hybrid profiles: SOC windows, charge and discharge limits and alarm frames mapped so the battery enumerates as a recognized slave on the bus.
Victron
Profiles aligned with Victron GX-class system integration: battery parameters surface in the color controller, with CVL/CCL/DCL limits driven from live BMS state.
Growatt
SPF and SPH family communication: handshaking, SOC synchronization and low-power shutdown behavior matched to the inverter's own logic.
Pylontech-Compatible
The frame format many off-grid and rack inverters expect from a "Pylontech-style" battery — supported natively so parallel modules enumerate without a gateway.
SMA
Sunny Island-compatible profiles: charge voltages, temperature derating and fault codes mapped into the inverter's battery-management model.
Luxpower
LXP hybrid inverter profiles with SOC accounting and time-of-use charge windows driven by the BMS state, for the EU and Africa distribution networks running these units.
Customization Process
How a Custom BMS Program Runs
Spec & Protocol Capture
Send series count, continuous current, comms interfaces and target protocols — plus a CAN capture if your device is off-list. An engineer replies within 24 hours with a feasibility read.
Schematic & Proposal
First schematic and a costed proposal land in 2 working days: protection thresholds, balancing strategy, connector plan and the PCB outline against your pack geometry.
Prototype & Firmware
PCB samples run with your firmware build — bench validation against protocol captures, temperature-chamber checks and cycle testing on pilot packs, typically 15–20 days.
Production
Volume boards ship with 100% functional test records and locked firmware revision. OTA channels stay open for field updates across your fleet.
Buyer Questions
BMS Programs, Answered by the Numbers
Can you mirror an existing inverter protocol?
Passive or active balancing?
How is firmware maintained in the field?
Send Your BMS Spec
Series count, continuous current, comms interfaces, target protocols and annual volume — you get a schematic outline and a costed proposal within 48 hours.
