Hi,

Two of my DIY "Portal" system's batteries started giving alarms on Sunday. The battery screen shows no active alarms, but connecting the battery to PBMS tools shows me a "Total Voltage Fault". Is there anything I can do, or is my only option to go to Revov directly?

They seem to give an alarm while charging and discharging, and I have not changed any battery settings.

I originally built the system in December 2024 and added a third battery in November 2025.

Bat 1

Bat 2

Edited April 6Apr 6 by FransJ

2 hours ago, FransJ said:

Hi,

Two of my DIY "Portal" system's batteries started giving alarms on Sunday. The battery screen shows no active alarms, but connecting the battery to PBMS tools shows me a "Total Voltage Fault". Is there anything I can do, or is my only option to go to Revov directly?

They seem to give an alarm while charging and discharging, and I have not changed any battery settings.

I originally built the system in December 2024 and added a third battery in November 2025.

Bat 1

Bat 2

Do you by any chance a voltage graph from the inverter for the battery?

Below is the voltage and current graph.

The alarm happens on both charge and discharge of the batteries, and only on the oldest two.

The jump in voltage after 4 am is when the newest battery ran down to 0%, and I switched one of the other batteries off and on. It ran for a couple of minutes before raising an alarm again.

2 hours ago, FransJ said:

Below is the voltage and current graph.

The alarm happens on both charge and discharge of the batteries, and only on the oldest two.

The jump in voltage after 4 am is when the newest battery ran down to 0%, and I switched one of the other batteries off and on. It ran for a couple of minutes before raising an alarm again.

I have not seen this error on a pacebms yet. If you read the pack settings for each pack what are the setting for OVP and UVP?

Also is the bms running coms with the inverter?

It seems B1 and B3 settings are the same, and B2 is a bit different.

Top (B1)

Middle (B2)

Bottom (B3) - Newest and working

Yes, I do have coms set up and running with my inverter (Sunsynk Rackmount 6KW)

10 hours ago, FransJ said:

Hi,

Two of my DIY "Portal" system's batteries started giving alarms on Sunday. The battery screen shows no active alarms, but connecting the battery to PBMS tools shows me a "Total Voltage Fault". Is there anything I can do, or is my only option to go to Revov directly?

They seem to give an alarm while charging and discharging, and I have not changed any battery settings.

I originally built the system in December 2024 and added a third battery in November 2025.

Bat 1

Bat 2

Your cells are perfectly balanced and healthy. The ‘Total Voltage Fault’ is most likely a BMS calibration or firmware mismatch between batteries, especially since you added a newer unit later. It’s not a real battery fault unless it starts affecting operation.

Send us firmware versions of all 3 batteries and which one is the master.

Edited April 6Apr 6 by TaliaB

2 hours ago, FransJ said:

Below is the voltage and current graph.The alarm happens on both charge and discharge of the batteries, and only on the oldest two.

The jump in voltage after 4 am is when the newest battery ran down to 0%, and I switched one of the other batteries off and on. It ran for a couple of minutes before raising an alarm again.

33 minutes ago, TaliaB said:

Your cells are perfectly balanced and healthy. The ‘Total Voltage Fault’ is most likely a BMS calibration or firmware mismatch between batteries, especially since you added a newer unit later. It’s not a real battery fault unless it starts affecting operation.

Send us firmware versions of all 3 batteries and which one is the master.

Would pacebms give a error when the batteries settings between each differs? I know some inverters get the charge voltage from the OV alarm voltage. Does it just send the inverter the master battery settings?

Edited April 6Apr 6 by Stefan Cornelissen

45 minutes ago, TaliaB said:

Your cells are perfectly balanced and healthy. The ‘Total Voltage Fault’ is most likely a BMS calibration or firmware mismatch between batteries, especially since you added a newer unit later. It’s not a real battery fault unless it starts affecting operation.

Send us firmware versions of all 3 batteries and which one is the master.

All the BMS are on the same version: P16S100A-31167-1.10B

The issue is that the battery stops charging and discharging when the alarm occurs.

I have tried running the batteries without communication between them, and sometimes they work for a few min or immediately raise the alarm

Do you mind checking the IndV1 voltage on the pack that does not give you a error ?

how close is the indv1 vs pack voltage

1 hour ago, Stefan Cornelissen said:

. Does it just send the inverter the master battery settings?

Yes the master dictates the charging/ discharging from inverter.

@FransJ What i would do in your case. Disconnect the batteries from each other then run each battery individually full charge/discharge cycles and see if you get any error. Run each battery individually with comms to the inverter. If you do not get any errors from the 3 batteries individually you have bms mismatch when connected in Parallel with comms.

I received a reply from Revov via email. They wanted me to call them and then let them connect with AnyDesk to see what I am seeing in PbmsTools.

When I had everything ready on Wednesday morning and called them, the guy just told me to take them in so they could test them. I will be taking them in today.

I have tried only running one battery at a time, but this also did not work. The one battery would immediately alarm, and the other would charge/discharge for a bit before raising the alarm.

On 2026/04/09 at 6:43 AM, FransJ said:

I received a reply from Revov via email. They wanted me to call them and then let them connect with AnyDesk to see what I am seeing in PbmsTools.

When I had everything ready on Wednesday morning and called them, the guy just told me to take them in so they could test them. I will be taking them in today.

I have tried only running one battery at a time, but this also did not work. The one battery would immediately alarm, and the other would charge/discharge for a bit before raising the alarm.

Let us know what the feedback is cause this seems more like faulty bms

I have taken the batteries in to be tested; their support team also never saw the error before.

They have stated that, unfortunately, it is going to take at least 20 days for them to get to my batteries and test them

I just received a message from Revov, stating they have replaced the BMS, and I can now collect my batteries again