Hello,
I have a problem with the above-mentioned device.
It ran without any problems for 3.5 months.
For some time now, error no. 2 — battery voltage too high — has been displayed.
To be precise:
Input voltage: 14.0 V
Current: 5.8 A
Power: 81 W
Output:
Voltage: 16.4 V continuously, even though the charge current limit is set to 14.4?!
Current: 4.9 A
Power: 79 W
I have two 105 Ah Bulltron batteries.
They’re 50% charged, so it should be putting more in.
After trying all sorts of tests, I sent the device in.
The tests found no fault.
I’m COMPLETELY at a loss.
Could you post screenshots of the settings (including advanced and expert pages) please.
At first I thought maybe a fuse has blown on your output side and the charger was just showing an open circuit voltage but given you’ve got 4.9A on the output side, that can’t be it.
A few things don’t add up here. A charging current limiter doesn’t regulate voltage. Please always include units.
What did you use to measure the voltage, and where did you measure it? At 16.4 V, the batteries’ charging ports should have switched off. So where is the current going?
I would be inclined to disconnect the MPPT charger so that you can eliminate that from the cause of the spurious voltage, or rather narrow down the problem.
If you can disconnect everything from you system (I assume you have fuses and cut off switches that will facilitate this) so that there is simply the battery and the XS in the equation then you can properly fault find.
At the moment, with the mppt connected, it could be the mppt producing the 16.6v and the XS is merely seeing it at it’s terminals.
Once you have only the battery in circuit, no loads, nothing. Then read your voltage and current on the output side of the XS
First, I’d test the booster on its own by unplugging the VE cable. That way, we’ll know whether the booster itself is faulty or is just being controlled incorrectly by an external device. The booster’s voltage settings are now set by the Cerbo.
It can really only be this one, right?
If so, the BMS can only communicate via Bluetooth, so it can’t be connected to the Cerbo, at least not out of the box. So the Cerbo can’t measure anything and therefore can’t control anything either…
You’ll probably have to either replace the batteries with ones that have CAN, or install a shunt, for example.
With enough know-how, you could perhaps also cobble something together with, say, an ESP32 to “translate” the BT-BMS data to CAN.
Well, there’s no way anyone could have guessed that…
Where is this SoC reading coming from, the BMS or the shunt? Are the shunt data available in the Cerbo?
3.5 months could perhaps also point to the SoCs drifting apart (BMS ↔ shunt)…?
Have a look to see whether the BMS and shunt are at least roughly in sync.
The Bulltron app shows exactly the same values as the shunt.
I sent the device in.
According to Victron, there’s no fault with the device.
Got it back today and installed it again.
Same problem. Constant output voltage of 16.4 V.
Switched off the MPPT as a precaution.
The shunt, MPPT and SmartShunt are connected in Networking.
I honestly have no idea what else to do…
Thank you for the sketches.
This is in a vehicle. Is it a car, van, camper, boat?
I think the problem is the negative connection to ground is not proper. The Orion GND (-) has to be connected to both systems - vehicle starter battery negative or vehicle chassis (-) and the shunt load connection somehow.
The Orion negative (-) is connected to some things “SGSK” - I cannot read your handwriting. (I can read some German), then “SGSK”. to the starter battery negative (-)
There could be an additional problem with the Multiplus chassis ground (PE or Earth) in this system and the big bus bar -.
