Morning All,

So I bought the inverter mentioned in the title this weekend. It was an insurance recovery item, so got it pretty cheap. It's brand new, but does have a something blown, that we still trying to find. But, I was hoping someone perhaps had the service manual and the installers manual please? Myself and a friend (who has been repairing power electronics his entire career) are busy going through it, but was hoping there was a manual to make our lives a little easier.

We connected up a 200Ah lifepo4 battery and it just beeped at us. I don't have 3 phase at home, so will probably take it to the wife's work this weekend to connect up and check it properly, or I'll need to put all 14 of my panels in series and see if that is enough to power it up.

Why do I want it? All the best tools for the workshop are 3 phase. 😁

Specs:

The BME WP TWIN 15kW is the latest commercial inverter from Blue Mountain Energy. The WP features offer a IP65 ingress protection which means the inverter is safe for outdoor use while the TWIN features offers dual outputs for smart load control. The BME WP TWIN hybrid solar inverter has on-grid and off-grid capabilities designed to keep businesses and/or residencies operational during power outages and reduce energy costs when connected to the grid.

The BME 15kW has a range of features such as:

• 150% unbalanced load support - Allows for power to be share between phases

• Dual outputs for smart load control

• Parallel up to a total of 6 units - Total of 90kW power

• IP65 ingress protection – Safe for outdoor use

• Built in Wi-Fi for remote monitoring

• 5-year standard warranty

• The BME TWIN 15kW is NRS approved

Weight: 78 kg

Rated Power: 15,000 W

Min PPT Voltage: 320 V

Max PPT Voltage: 950 V

DC Startup Voltage: 350 V

DC Shutdown Voltage: 320 V

Max Input Voltage: 1,000 V

Max DC Power: 22,500 W

Max AC Power (5 Minutes): 16,500 W

Surge AC Power (1 Second): 28,500 W

Max DC Current: 54 A

Max DC Inputs: 4

Has DC Fuses: 0

Connector: MC4  

Included Connectors: 4

Euro Efficiency: 95 %

Transformer: None

IP Rating: IP20

MPPT Quantity : 2

Has Integrated DC Switch: Yes

Warranty: 5 years

Edited May 17, 20251 yr by ShaunCro

So a progress update on this.

I replaced the DC board, and relay board, because the one I was supplied was different to the one I had in there. Much larger. I could only get the 12Kw dc battery board. And it appears that someone has tried to repair this unit before, because looking at the numbers on the boards, the Main board doesn't match with the rest of the boards fitted. When I say this, I mean that the old relay board and a few others ended with a 00G where the newer ones end with 01G. I also purchased another main board but after testing all the IGBT's on the board, it seems fine, and all tests on the other components seem fine in circuit, so will have to see.

I hooked up a 51.2V battery to it last night, and hit the cold start button and fans started spinning and I could reach the built in wi-fi unit, but the battery was a bit flat, so it spent the night and day with a charger connected feeding it 6A and 53.5V it's almost done and then I'll try again.

So, with last nights startup, the screen wouldn't come on. Now, when I received it, there was only 1 cable going from the Comm board to the screen, but I see another connector on the control board marked for LCD, and not sure if this, or another cable is missing. Hence me hoping someone has the service manual so I can check wiring for this type of thing. Mailed Segen on Monday with no reply. Mailed BME today, so will see if they reply. Otherwise just gonna have to guess I guess. 🤷‍♂️

Edited May 17, 20251 yr by ShaunCro

And my buddy says this was water damaged, on the DC battery board, there was lime build up, which he says happens when electronics take a swim and then try working after that. Which is strange, because it's meant to be IP65 rated, so who ever set it up, must have not closed it properly, and water got in. The unit came from CPT, and I remember there being floods recently or a few months back, but the entire left bank of mosfets on the dc board were cooked, and after removing that board the burnt electronics smell went away. We will play a bit more tonight and see if we can connect to the serial port and see what is there.

I also picked up another 6 panels today, so I'll be running the unit on 2 strings on 10 x 550W panels. Which I believe is the recommended minimum. Everyone keeps asking if I have the space for all these panels, by my calculations I could easily fit another 15 after these 6, the joys of having a flat roof. The problem is just getting them onto the roof by myself, man it was a mission with the first 14 panels.

Edited May 17, 20251 yr by ShaunCro

So I guess, don't plug in a USB :-| Sigh. I wonder what chip that was now.

Don't you love it when it melts the copper into little beads... Oh well. Chip is unreadable, hope fully I can it somewhere.

4 hours ago, ShaunCro said:

I wonder what chip that was now.

Perhaps ULN2003 7 channel Darlington driver.

The appearance of the case suggests an Infini. It should be possible to find a 15kW Infini service manual.

6 hours ago, Coulomb said:

Perhaps ULN2003 7 channel Darlington driver.

The appearance of the case suggests an Infini. It should be possible to find a 15kW Infini service manual.

Yip, it is an infini licensed clone. I can find other versions of the service manual, but not for this particular range, the DC boards and Main boards as well as relay boards are very different to the manuals I've managed to find.

And not so sure about it being a uln hey Coulomb, I thought that at first, but two of the pins terminate on the header leading to the com board, so I'm wondering if it's not some type of serial chip maybe? It's also very close to unpopulated LCD connector that isn't used from what I can see. There are also pins that terminate directly on the slave chip. But these could be power, I've managed to trace the points I need to run the repairs to, but it got late and I was tired and went to bed. Probably a good thing. I'll need to see what the slave chip is and pull up it's datasheet, and map out all the tracks to see. This control board appears to be used on a 10Kw, 20Kw and 30Kw system, with the latter two being free standing units, similar looking to old UPS's.

Edit: I suspect this happened when I plugged the usb cable in, because my laptop went into protection mode, and I had to remove the battery and clear the caps to get it to start up again.

Edited May 18, 20251 yr by ShaunCro

19 hours ago, Coulomb said:

Perhaps ULN2003 7 channel Darlington driver.

The appearance of the case suggests an Infini. It should be possible to find a 15kW Infini service manual.

Looks like you were spot on Coulomb. Busy with the repair now. Thanks :-)

Edited May 18, 20251 yr by ShaunCro

FYI Came across the service manual randomly today while looking for a screen replacement.

https://powerforum.co.za/files/file/203-blue-mountain-energy-3p-wp-15-twin-service-manual/

Hopefully it helps someone iout.