I’m experiencing an issue with my MultiPlus Compact 24/2000/50 while it’s operating as a charger. Normally, the charger should follow this sequence:
Start in the bulk phase (constant current, voltage increasing).
Once the absorption voltage is reached (set to 28.8V in my case), it should transition to the absorption phase (constant voltage, decreasing current).
Problem:
The charger remains stuck in the bulk phase and does not transition to the absorption phase, even when the voltage exceeds the set value of 28.8V. Instead, the voltage keeps rising beyond this limit.
What I’ve done so far:
I checked the configuration using the DIP switches.
Then, I connected the device via MK3-USB and confirmed with VictronConnect that all parameters were properly set.
Additional information:
I am using Victron Energy GEL deep cycle batteries, and I have ensured
that the charging parameters are correctly matched to the specifications of these batteries (28.8V absorption voltage, as recommended).
Has anyone experienced a similar issue with the MultiPlus, or does anyone have an idea of what could be causing this behavior?
Hello, first of all, I want to thank you for all your responses and support.
I added a temperature sensor to my MultiPlus, but this did not solve the issue. In the “Temperature Compensation” parameter, I have a value of 32.42 mV/°C. Normally, the absorption voltage configured via the VictronConnect software is 27.4 V for a temperature of 25°C.
If I understand correctly, the absorption voltage should therefore not exceed:
27.4 V + (32.42 mV/°C × 10°C) = 27.72 V (for a temperature of 15°C, according to the screenshot attached).
However, according to the image in the attachment, the voltage rises to 29.7 V, and this is not even the maximum value, as I had to manually stop the system, which means it can exceed this value.
I do not know if this issue is due to a configuration error on my part or a defect in my MultiPlus 24/2000/50.
For reference, I initially configured the device using the DIP switches (01000000). After noticing the issue, I used VictronConnect to lower the absorption voltage to 27.4 V and validate the other settings.
If by “inverter” you are referring to the MultiPlus, which in this case functions as a charger, the DC voltage measured (shown in the attached screenshot at 29.7 V) is obtained by the MultiPlus Compact and displayed on a GX device. Additionally, I use two other measurement devices, including the BMV-712 from Victron Energy. The voltage measured by the BMV is more or less identical to the one displayed by the MultiPlus, with a difference of about 0.3 to 0.5 V (for example, when the voltage shown on the GX is 29.7 V, the BMV shows 29.4 V).
Regarding your second question about the Fronius, I have configured it in MG50 mode (configuration for microgrid systems at 50 Hz).
Finally, regarding the 1:1 rule, which states that the MultiPlus power must be equal to or greater than the PV inverter’s power, the answer is yes. However, I believe this rule is not an issue here because, for now, I have been conducting tests at low power, around 600 W, due to the problem.
Thats great, but is it configured for the control by the GX using the dno settings?
Anything at all from the manual?
What assistant os programmed on the inverter to control the Fronius? ESS or PV inverter assistant?
Something needs to tell it to stop or start or throttle based. Seems like the stop/throttle part is not happening
Thank you very much, everything is working fine on my end, and the charger switches to absorption mode, so everything is good. However, I noticed a small issue related to the DNO configuration. To make the necessary adjustments, I need to access the settings in the “DNO Editor” menu, but a password is required for the modifications, and I couldn’t find it. Do you have any idea, please?
I’m not sure if I modified the service password. Initially, I only created a password for the administrator, which doesn’t work for the service.
From what I understand, resetting a forgotten password requires access to Fronius SOS, but as a privileged user, I don’t have access to it.
Just to confirm that I’m following the correct steps: In the Fronius web interface (http://192.168.250.181), while staying connected to the device’s access point, I need to access the “DNO Editor” window and modify the control priorities, setting Modbus control as the first option. Is that correct?
Is there a way to recover the service password? When I try the “forgot password” method, I need to go through the “Fronius SOS” step, but it gives me an error, which is attached.
Actually, Fronius has a poor customer service. I already contacted them, and after two days of waiting, they simply asked me to go through the “forgot password” process, then share the PIN code and the datalogger number for my Fronius.
However, the recovery key they provided does not work, and the error I encountered is shown in the attached figures. Their process is unnecessarily complicated just to change a password, which is really frustrating.
Thank you very much for your responses and the time you have given me. Sorry for my late reply. This morning, I contacted Fronius by phone and gave them access to my computer via TeamViewer. They were able to control it remotely and reset the forgotten password. I sincerely appreciate your help!
However, just after resolving the discussed issues, a new problem arose: the CCGX indicates a low battery voltage, and the red LED is blinking, even though the actual battery voltage remains high (24.5V for 12V batteries connected in series).
