Just swtich on DVCC and leave SVS, SCS and STS off.
Some BMS, like pylontech even force those settings.
with DVCC swtiched on and the BMS selected as battery manager, the Cerbo GX will instruct you MP2 and your two MPPTs to apply the correct charge voltage.
MP2 and MPPT must be connected to to Cerbo GX via Ve.bus (MP29 or VE.can (MPPT).
Instead of JK BMS you can also use SmartShunt but than you might loose alarms from JK BMS.
I have no experience with the SmartShunt for batteries.
BTW: you can show data from several battery monotors. Just enable them in GUI v2 → settings → battery → battery monitor
Hi, you can set the JK BMS to be the controlling device not the smart shunt. The benefits here are the voltage measured at the battery are little more accurate, the current isnot as accurate in the JK compared to the shunt, you will get a SOC imbalance between the two (BMS and Smart Shunt) over time when the battery doesnt get back to 100%. But if you regularly get back to 100% its not an issue. Even if you dont you may see a 10% difference in SOC values. My system runs this way using the JK as the source for battery voltage and charge current. I use the smart shunt just as a backup monitor. But ultimately in my view, it should be the battery BMS telling the charging system what to do, as its job is protecting the battery form over current etc. Because you are cycling the battery quiet a bit, there is some belief that 2 batteries is better, this would reduce the cycling on the battery, thus greatly increasing the battery life. I have subscribed to this theory, but I am not convinced these batteries have been around long enough to actually have the evidence to back it up. But I feel that gentle approach is better as it must chemically be better for the battery. So when the 48/5000 draws max amps for an hour (110A) its shared across 2 batteries at more like 0.25c rather than closer to 0.5c Your charge rates are low enough to not require any changes as this meets the 0.2c or 57amps suggested charge normal limit of the Eve LF280k batteries.
Have done some tests and found the following result
DVCC On with charge current limit to 28 A.
SVS, SCS and STS Off.
Battery Monitor and Controlling BMS selected to JK BMS in settings. RCV/RFV/SOC 100% at 3.457/3.35/3.447 in JK BMS settings.
RCV/CVL was never reached due to voltage difference of 0.07V between MPPT and BMS and charging status remained in Bulk only.
SVS made On and Battery Monitor changed to Smartshunt. RCV/CVL achieved and charging status updated to Bulk/Abs/Float as per values set in BMS.
Smartshunt is connected downstream of BMS (4 inch distance) and both read/display same voltage. Have kept fallback settings in MPPT same as in BMS in case of communication failure.
Will continue to observe for some more days and will update for any deviation.
Will add one more 16s battery in parallel in near future as currently with 3.6KwP panels capacity, maximum battery charging never cross 55A
After running the system setup as mentioned above, amazed as VE works as a charm. No hiccups, alarms, deviations or anything annoying. Happy to have chosen and invested for a DIY in VE.
am also using Adler EF3 200A fuse for Multiplus 2, fits properly in Lynx Power in M8, VE ceramic 100A/80V for the MPPT and NH01 gG 225A/125V fuse for the Battery.
You can compensate your voltage difference of 70mV between BMS and MP2 by a “V-sense” wire. This connects between MP2 green termina block and batteries terminals and measures battery voltage without load e.g. without voltage drop due to resistance.
