2.5 Communication issue with Inverter / BMU EC106
PDU output voltage is normal and you can see BMS (cell) data in BCP, but inverter does not detect battery.
Note: if PDU output voltage is incorrect (eg 16V) or BMS (cell) data cannot be seen in BCP, then go though
section 2.4
first
No.
Name
Description
30
Configuration
Check if the configuration is correct. Refer to latest “BYD Battery-Box Premium LVS
Minimum Configuration List” (V1.7 or above) available at:
Make sure the inverter is configured and working correctly.
31
Output voltage incorrect?
No BMS Data?
Check according to
section 2.4
. Especially make sure to configure battery via app
and to properly restart afterwards.
32
Inverter settings
Make sure to configure the battery correctly on the inverter interface. Refer to
inverter manual for details.
33
Replace comm cable
Replace the communication cable (min. CAT5!). Confirm PIN cable configuration
for the specific inverter model (see manual)
34
Further checking
If problem remains:
- Test another BMU, if available
2.6 SOC & charging logic
No
Name
Description
35
SOC jumps
The SOC of an LFP battery cannot be measured. It is a calculated value. In general, the
state of charge (SOC) of a battery is calculated using the voltage, but other factors such
as temperature, current flow and charging behavior also play a role. The calculation of the
state of charge is generally more precise if the battery regularly sees full cycles. Every now
and then an SOC correction / calibration might occur. That is normal.
2.7 Unexpected shutdown
System has been successfully commissioned in the past and did run for some time. Later on an unexpected shutdown occured.
No
Name
Description
36
Inverter
Communication
The battery only works with an compatible external inverter. If for whatever reason the
communication between battery and inverter is lost, the battery will shut down itself within
30minutes. Therefore, check which one did shut down first (battery or inverter) and check
if inverter is properly detecting battery (e.g showing correct SOC or temperature). If
problem remains, check according to
section 2.5
.
37
Battery Logs / History
Data
Sporadic alarms are hard to detect as they only occur sometimes. Therefore, it is very
important to download and provide all the historic battery log files in order to identify the
root cause. See
section 2.9
for details.
38
Inverter Warning &
Monitoring
Unexpected Shutdown can be caused by overall system settings. Therefore, it is necessary
to evaluate inverter data as well.
-
Which error message are shown in inverter (portal?
-
Please provide access to Inverter portal (add [email protected] and tell us
the name of the system in the portal)
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