Dear friends,
I am seeing some strange values while charging from grenerator in an offgrid cabin.
System setup:
- REC Q BMS
- 16 Winston Lifepo 300 Ah cells connected in series@48V
- Multiplus-II 48/5000/70-50
- CerboGX (fw. v. 2.73)
- Smart Solar MPPT 250/85
Generator: Honda EU70is
The Multi was installed prevously this year, but were after a while replaced by the dealer with a new unit due to malfunction (constant humming/buzzing sound, even with no load).
Upon installing the replacement, I allso installed a surge protection between the genset and the Multi. The AC-Out L1 leads to a breaker box with overload protection and 4 RDCs. They are all connected to ground. The genset is alsoo tied to ground with another ground ple connected to the chassie.
I am not sur exactely in the installation the fault appeard, but while charging from the genset, the Multiplus AC-In L1 shows negative current (A) and watt (slightly). The AC-Out L1 shows high negative values (-4100W / -18.1A).
However, the BMS menue on the Cerbo shows that the batteries are charging at full power.
On the Pages display the Generator icon shows a slight negative value (around 100W), that the Muti is in bulk mode and that current is flowing into the battery bank. See the attached screen shots.
Can anyone help med make sence of this or sugest where to start the troubleshooting? Preferabliy, suggest a solution?