Rectifier Huawei R4850G2 48V 42~58V 3000w

[j bjork]

Were you (or someone else) able to find it or something simular?
I should soon have to modify 2 of these psu:s, it would be nice to be able to adjust them without the programming.

I do not know,,, only china controller.. now I have contact to get it... I have two... no used for now...
https://drive.google.com/file/d/1tu_HWx ... q9oAj/view

I was able to buy the control boards linked earlier in the thred. I haven't got them yet, but they seem to be close now. After almost 2 months..

[j bjork]

There is a Chinese guy selling the programmer boards for about 12$ on Taobao
https://2.taobao.com/item.htm?id=565948 ... oSite=main

If you are having difficulty ordering it then you can use a third party service like Taobao Focus.
They will order it for you and ship it to you.
https://buy.tbfocus.com/item.php?id=565948826876
It's in English and they accept Paypal.

These ones, I didn't realize that it was still possible to buy from there still. Thanks eee291

[j bjork]

I got the control boards today.
I went looking for a power supply for the board in the psu.
I found the fan had a steady 12,7v, I thought that would be perfect.







Well, I connected the board to the 12,7v. It seemed fine.The leds lighted up, it reacted when i clicked on the knob.
I tried connecting only can bus, seemed fine (no leds or anything, but it was not powered up)
When I connected both, bang. The fuse blew in the garage and everything. The psu died. One of the big mosfets exploded.

The control board also smell a little burnt, and there are a little discoloration on the contact housing.

But I don't really understand why? Can bus should be isolated from everything else as far as I know?

[amberwolf]

Most likely the sections you connected with wiring to the add-on board were isolated in the PSU, and connecting them shorted things out.

You'd have to trace out and measure on a still-working PSU whether there are already connections between those sections, and if not, don't make any.

[j bjork]

I wonder then if it is safe to parallel the can bus from more than one psu?
I plan to run 2 psu:s in series, and control them both with one control board over can bus.
So the can bus will be connected parallel.
From my experience with can bus it should be almost indestructible.
You can short them to each other, to + or -, just repair the the fault and it works again.
And they are usually connected in big systems with several units talking to each other.
But my experience is from cars.

[amberwolf]

If the bus is isolated from the other connections you have between PSUs, then it shouldn't be a problem.

If it shares the ground with the power output, then you could not put them in series and still connect it, because connecting the ground would short out the more negative PSU's output.

They could still be put in parallel, however.

If they are not isolated but you can use optoisolators on the bus, then you could connect them anyway.

[j bjork]

There are no connection between either positive or negative output and either of the can bus wires, so I guess it should be safe..
At the moment I am a little low on psu:s, so I cant really test
Luckily I bought extras of the control board.

It seems to work fine at adjusting the voltage output, (with an external power supply for the board) but I haven't really figured out how to set the default output(when the control board is not connected) It seems to have changed, I am pretty sure I had 54,5V before. But now I have 55,7V. Maybe it gets lower under load, but I am pretty sure it has been stable at the same voltage both with and without load before.

I am also interested in those blue and red voltage and current displays that people are using. Does anyone has a link?

[rigmo]

I was able to buy the control boards linked earlier in the thred. I haven't got them yet, but they seem to be close now. After almost 2 months..

2. The computer serial port debugging tools, see figure set parameter writing CAN control board (USB serial port module.)

[j bjork]

Hmm,I am not sure if I understand. Do you mean that you need to connect the control board to a computer with this usb tool to change the default settings?

[rigmo]

IMG_2637rez.png (115.71 KiB) Viewed 4832 times

HI NEWS
Display monitoring of huawei and emerson PSU.

control boards
USB serial port cable
Huawei and Emerson's control board PCBA is the same, but not universal, the software communication protocol is different.

[j bjork]

Display monitoring of huawei and emerson PSU.

control boards
USB serial port cable
Huawei and Emerson's control board PCBA is the same, but not universal, the software communication protocol is different.

Have you been able to set the default output of the psu?
My has changed to 55,7V after I have connected the control board.
I don't have the parts to connect it to the computer.

[hyphenated]

A little update on my PSU hacking attempts:
{snip}
Work in progress still, code on GitHub https://github.com/BotoX/huawei-r48xx-esp32
Using this lib for CAN on ESP32 https://github.com/sandeepmistry/arduino-CAN

I want to use the Huawei as a jump-start power supply for a 20kW flow-battery installation using Redflow ZBM-2 zinc-bromide units. I've got them in place, but COVID-19 has sabotaged the commissioning timeline. One of the peculiarities of a flow battery is that they can be (and in fact need to be for dendrite removal) fully discharged. From that state they need a 56V power supply at high amperage to get them to the point that they can be run normally, and I wanted to set up a Huawei rectifier on the DC bus to kick in if/when required under BMS control - whilst it is possible that the Sunny Island can do this, that is not yet clear.

Because a rectifier is inherently designed to operate in a n+1 environment with high reliability and life, it seemed ideal. But of course the controls are proprietary. I decided to build a CANBus unit in the hope that I could set the voltage and current limit permanently with a view to using the rectifier under BMS control using dry contacts.

Originally I purchased an Arduino UNO and CANBus shield plus a couple of MCP2515 cards (cheap as chips) but actually implementing a CANBus tool from the tools and code out there turned out to be a lot more difficult than I thought. Plenty of mickey-mouse demos which will turn an LED on on a receiver when a transmitter is actuated, but functional transceivers either relied on obsolete and withdrawn software, or were firmly oriented to vehicles, and as this appears to be a lucrative market, pried accordingly.

As I also had a an ESPDuino clone I was seduced by BotoXbz's solution. So here are a few errors I made en route: Note that mose ESP32 boards are 3.3V, and do NOT require a CANBus chip - just a driver. I ended up cannibalising an MCP2515 (which is 5V) by stripping the CANBus chip and strapping to the driver. Messy, but cheaper - plus it saved my waiting three weeks for a part.

• Install PlatformIO and let it pull in updates.
  Import the huawei-r48xx-esp32 GIT
  Edit main.cpp to insert your WiFi SSID and passphrase
  Edit platformio.ini to add monitor_speed=115200
  
  The route I took is slightly different - an ESPDuino is an Arduino card with an ESP32 and runs off 5V.
  GPIO4 is CRX, GPIO5 is CTX, although different pins can be programmed using CAN.setPins(rx, tx)
  If you do cannibalise an MCP2515 I suggest you remove the crystal first, then cut off the pins on the side nearest the crystal as close to the chip as possible to avoid tearing the tracks.then bend the chip up (trying to bend the pins without ripping the pads off) sufficiently to cut the other side.
  Now desolder each pin from the pad.
  Now strap RXD and CXD to the input pin of your choice. Lizst wire might be good, I used telephone single-strand, which gave me issues with melted insulation on the bends.
  There is a 120 Ohm resistor in the MCP2515 - you need to strap J1 - I then added a terminating 120 Ohm in the cable at the Huawei. You might get away without, but it should eliminate reflections in the cable.

When I first looked at BotoXbz's code I despaired - how did the bits fit into an Arduino code space? The answer is that they don't. I installed PlatformIO, whixch is "Open source, cross-platform IDE and Unified Debugger. Static Code Analyzer and Remote Unit Testing. Multi-platform and Multi-architecture Build System", but the big-ticket items are that it allows the use of multiple types of card, allows a GIT source to be utilised as-is, and provides all the tools you need - for free. I cannot emphasise how gob-smacking it is to use an open-source tool like this - when I was in my first job (in the seventies) I was working with UV-erasable eight-bit processors for a PABX line card, and the hardware and software tools needed were pricey, clumsy and proprietary. This is my first time playing in the software pond since that design (by the way - a lot of engineers thought it insane to have an eight port line card design with nine microprocessors ) and it's a whole new ball-game.

Suffice it to say (and to my complete amazement) the GIT transferred smoothly, the code assembled and transferred, and after a hiccup with swapped CAN-L and CAN-H I was able to talk to the Huawei.

IMG_5381 - resize.JPG (102.03 KiB) Viewed 4720 times

I used a connector, rather than soldering to the edge of the PCB.

IMG_5384 - resize.JPG (91.18 KiB) Viewed 4720 times

[hyphenated]

There are no connection between either positive or negative output and either of the can bus wires, so I guess it should be safe..

There is a 5kV isolator in the Huawei, so multiple CANbus connections can be made in parallel - it's a differential transceiver, so neither leg is earthed. You should aim to have two 120 Ohm resistors in parallel with the bus to suppress reflected signal interference; one at your transceiver, the second at the furthest Rectifier. Keep stubs short; ideally just tap into the bus at each rectifier.

[j bjork]

There are no connection between either positive or negative output and either of the can bus wires, so I guess it should be safe..

There is a 5kV isolator in the Huawei, so multiple CANbus connections can be made in parallel - it's a differential transceiver, so neither leg is earthed. You should aim to have two 120 Ohm resistors in parallel with the bus to suppress reflected signal interference; one at your transceiver, the second at the furthest Rectifier. Keep stubs short; ideally just tap into the bus at each rectifier.

Thanks, the control board already has 60 Ohm built in. Should I use the same on one of the psu:s, or still go with 120 Ohm at that end?

[hyphenated]

It sounds as though he has intended the controller for use with a single rectifier, which means that the leads are very short (as per photos), which means that he could get away with consolidating the two parallel 120 ohm resistors in a single 60 ohm.

If you are using multiple rectifiers then there needs to be a variation in the code to select and communicate with a specific rectifier - I can't imagine that they will all respond to commands together (in fact if they did, they would probably jam the bus). So multiple connection will probably require either a modified unit or a different controller. I would think that the rectifiers will recognise that there are others on the bus, and change their address on startup, but what I don't know about CAN protocols would fill an encyclopedia.

Short answer - if you fix the control issue and have longer runs, you will probably need to replace the 60 ohm with a 120 ohm and add a terminating 120 ohm at the end of the cable.

[rigmo]

Display monitoring of huawei and emerson PSU.

control boards
USB serial port cable
Huawei and Emerson's control board PCBA is the same, but not universal, the software communication protocol is different.

Have you been able to set the default output of the psu?
My has changed to 55,7V after I have connected the control board.
I don't have the parts to connect it to the computer.

yes can be made default required voltage pcb control board ...

[pavlik1]

Hello rigmo

How exactly you change the default voltage? Which tool to use?

Thank you

I was able to buy the control boards linked earlier in the thred. I haven't got them yet, but they seem to be close now. After almost 2 months..

2. The computer serial port debugging tools, see figure set parameter writing CAN control board (USB serial port module.)

[szczur333]

is it possible to charge 20S battery pack and adjust current (depend of current needs?)


now i have GTK 72V (84V) 30A charger but its very heavy and big, also it doesnt have any adjustments
(this gtk 72V 30A gives only 24-25A real current, it consume 2070-2120W from wall

so if I can achieve 2500-2800W which will be about 30-33A real - this will be my best solution for my ebike, and with current adjust I will charge slower (10A on hot days or at nights, when I am not in rush)

[frank_zero]

I was able to buy the control boards linked earlier in the thred. I haven't got them yet, but they seem to be close now. After almost 2 months..

2. The computer serial port debugging tools, see figure set parameter writing CAN control board (USB serial port module.)

Hello Rigmo are you maybe selling any of those can bus controllers ?
Hello all sorry but i m new here i also have to get used to this kind of forum , search and answer systeem.

[frank_zero]

I found out a easyier way to start the Rectifier Huawei R4850G2 48V 42~58V 3000w when you use the connector for the wiring
and you take small the start plug, the 2 wires of the start plug you just have to put both to the DC - and the Rectifier Huawei R4850G2 48V 42~58V 3000w wil start.
Does any one know what model /type for small connectors it are ?

[salavati05]

I have direct contact of PCB controller builder from china.. 任星星

hi rigmo
you can help me ?
do you have cod canBUS for R4850G2.

[salavati05]

I have direct contact of PCB controller builder from china.. 任星星

HI rigmo
i have controller pmu 11a
but i can't connect to controller for change voltage
do you have WhatsApp or telegram for connect

[john61ct]

It is in cool weather that C-rate needs to be lowered for pack longevity

Hot weather enables fast charging with less damage

[frank_zero]

Has any of you put 2 Rectifier Huawei R4850G2 48V 42~58V 3000w in serie ?
can you also mont them standing up or down ? instaid of laying down ?

[salavati05]

IMG_2637rez.pngHI NEWS
Display monitoring of huawei and emerson PSU.

control boards
USB serial port cable
Huawei and Emerson's control board PCBA is the same, but not universal, the software communication protocol is different.

hi rigmo
do you have this control boards?
i need this
please help me