mGYDY makes UART controllers for Bafang mid-drives in two very different sizes. The 48V/52V 1000W version is the one built for the BBSHD, BBS03 and G320; the 36V/48V 250W and 350W units that lead the range belong on much smaller motors.
The mGYDY range is headed by a 36V/48V controller in 250W and 350W ratings, and its description lists the BBSHD among compatible motors. The plug and protocol may match, but the rating does not. A BBSHD is a 1000W motor, and a 350W board is built to deliver roughly a third of that.
The board that suits an HD is the 48V/52V 1000W version, sold for the BBSHD, M615, BBS03 and G320. Those names all describe the same heavy-duty motor family, so any of them on your motor label points to this version. The label sits on the motor housing; wipe off the road grime before reading it.
| Version | Voltage | Power | Right for a BBSHD? |
|---|---|---|---|
| BBSHD / BBS03 / G320 | 48V or 52V | 1000W | Yes |
| Light duty | 36V or 48V | 350W | No |
| Light duty | 36V or 48V | 250W | No |
The 52V rating on the HD version is useful. Many BBSHD owners run 52V packs for more punch and less sag, and a board rated for it removes any doubt.
How controller rating, current and heat connect on a long climb is set out in the BBSHD controller guide.
| Spec | Value |
|---|---|
| Brand | mGYDY |
| Protocol | Bafang UART (not CAN bus) |
| BBSHD version rating | 48V/52V, 1000W |
| BBSHD version motors | BBSHD, BBS03, M615, G320 |
| BBSHD version case | Alloy |
| Light-duty options | 36V 250W, 48V 250W, 36V 350W, 48V 350W |
| Light-duty motors named | BBS01, BBS02B, BBSHD, M400, M620, G020, G310, G320, G340 (mid-drive versions) |
| Light-duty connector | 5-pin waterproof Higo-style, female |
| Sealing | IP65 (light-duty versions) |
| Protections | Over-current, over-voltage, low-voltage, over-temperature |
| Diagnostics | Hall sensor fault detection |
| Light-duty box contents | Controller and 5-pin mating connector |
| Not included | Display, throttle, wiring harness |
| Suggested displays | Bafang UART displays such as the C965, DPC18, DP C10 |
| Not compatible | Hub motors, KT and YL controllers |
The 250W and 350W versions exist for Bafang's smaller mid-drives, and for those motors they are a sensible part. Four options cover 36V 250W for light duty, 48V 250W as standard, 36V 350W for more torque and 48V 350W as the strongest. All four share the same 5-pin UART interface and the same physical size.
They arrive with a matching male connector, so the old plug does not have to be cut. The seal rating is IP65, enough for riding through rain and wet roads.
The range also mentions regenerative braking where the motor supports it. A BBS mid-drive freewheels through its internal clutch, so it cannot push current back into the pack, and riders should not expect any regeneration on these motors.
For display pairing, mGYDY names Bafang UART screens such as the C965, DPC18 and DP C10. The box holds only the controller and a mating connector: no display, throttle or harness.
An owner of a small commuter mid-drive can treat the light-duty board as a straight replacement. An owner of a heavy trail bike with a 1000W HD should skip it entirely, whatever the compatibility line says, and order the 1000W version instead. A BBS01 at 36V 250W, on the other hand, is a light city motor, and the lowest option keeps the gentle feel its rider knows.
A controller swap on an HD takes an hour on a clean bench. The board lives in the rear cap of the motor, so the job is unscrewing that cap, moving the plugs across and sealing it again. The 1000W mGYDY version comes in an alloy case, which helps it shed heat into the motor housing on long climbs.
Step three matters because Bafang controllers come in old and new housings. A board that is the wrong shape for your cap will not close properly, and a gap there lets water straight in. If the old gasket is torn or flattened, fit a new controller gasket during the swap.
Programming is the last step. A replacement board starts from its own defaults, so load your saved current limit, assist levels and low-voltage cutoff through a 5-pin programming cable. A 52V pack needs its cutoff set for 14 cells.
After the first ride, recheck for error codes and feel the motor case after a climb. A board that throws faults straight away usually has a plug seated badly, which is cheaper to fix than to replace. Each setting gets a line of its own in the programming guide.
Every mGYDY version uses Bafang's original UART protocol. That covers the classic BBSHD with its 1T4 harness and 5-pin display, which is still the most common HD on the trails. It rules out the newer CAN-bus BBS-HD kits, whose displays, harness and controller speak a different protocol.
Against Bafang's own replacement board, the mGYDY 1000W version is a third-party part with a clear HD rating and a 52V label. Bafang's range carries OEM parts, but its lead version is a 48V 750W BBS02B board, so HD owners must pick carefully there too. The KZKO range offers a 48V 1000W HD option with notes on old and new housings.
Tick these off at the bench first.
Keep the old controller until the new one has a few rides on it. If a fault appears, swapping back tells you in minutes whether the board or the motor is to blame. The alloy case helps with board heat, but it does not change the motor's own limits; gearing does more for a hot climb than any controller.
Riders who want more current than stock, for cargo or a big fat bike, need a specialist high-current board instead, and should read the heat warnings in the 1000W power explainer first.
The 48V/52V 1000W version for BBSHD, BBS03, M615 and G320 motors. The 250W and 350W versions are too weak for an HD.
The 1000W version is rated 48V/52V. Set the low-voltage cutoff for 14 cells after fitting it.
No. Every mGYDY version uses the UART protocol, so a CAN-bus kit needs a CAN controller.
No. BBS mid-drives freewheel through an internal clutch, so they cannot regenerate, whatever the controller supports.