Hello,
Does anyone happen to be running an Ultimatron LFP04 with a Victron MultiPlus 12/3000?
I’d be very interested to know how the battery operates without a direct connection to the MP and
whether a shunt has been installed.
Cheers, Volta
The MultiPlus does not require a direct data connection to the battery for basic operation. However, with a third-party LFP battery, it is crucial how the BMS communicates charge and discharge enable signals. The internal BMS hard cut-off should not be the normal control strategy.
I would ask Ultimatron to confirm in writing that the LFP04 is approved for voltage-controlled operation with this exact MultiPlus, which charging parameters apply, and whether a BMS output must disable the MultiPlus via Remote on/off. Victron describes the basic logic for selecting a BMS here: 3. System design and BMS selection guide
A SmartShunt is not essential for operation. It is useful if you want to see a reliable state of charge (SOC) and its history; it does not replace protection or enable functions. See the Victron manual here: Manual - SmartShunt
In short: technically, operation without a data link is generally possible, but only after receiving approval and the relevant parameters from Ultimatron. I would not rely solely on the internal battery BMS switching the battery off.
It is always beneficial for a battery’s parameters to be adjustable. In particular, the voltage at which balancing begins is fairly high for many batteries, meaning that the charge termination voltage must also be set high. However, this in turn leads to increased battery wear.
In summary, a battery should allow its parameters to be adjusted. Ideally, communication would also be possible, so that the battery could communicate its charging requirements.
Hello,
Thanks for the information on the voltages. I think the MultiPlus is simply configured according to the battery’s specifications, and the voltages are very high. It’s a company car, and I’ll take another look at the system
once the vehicle is back in the workshop. From my perspective, the MultiPlus’s cut-off isn’t working properly either: it drains the entire battery down to the end voltage, which probably isn’t sensible in the long run. Apparently, communication from Ultimatron isn’t supported,
otherwise this would be easier to regulate, and I could also set a minimum SOC.
Hence the idea of using a shunt; then the MP could at least regulate things properly.
Best regards
Volta
A SmartShunt would be an option. But without a GX, it’s no use to the MP2. I mean, I don’t think they can communicate directly with each other.
However, you could program the SS to switch its output at a specific SOC, which you could then use to switch off the MP2.
Or get the complete setup with a GX; then (almost) all options are open to you.
Hello,
the system actually has everything it needs: a Cerbo, a display, an MP and a proper busbar.
I’m not sure why a dummy battery was installed, but I’m working on finding out.
As soon as the vehicle is back from the outfitter, I’ll take a look at the readings.
There’s usually only one explanation for that: the price…
You can plug a Bluetooth dongle into the MP2 and use it to communicate with the SS and other components, such as MPPT controllers, via Smart Networking.
Good point, I’ll check that and, if appropriate, include it in a future extension. Thanks.