New to a recently installed and working lithium system on a canal barge and trying to understand the interplay of all the settings.
I have installed a Multiplus 12/3000/120 with 2-wire assistant controlled by the 123SmartBMS, 3x Smartsolar MPPT 100/50s, about 1660 watts of solar, BMV712 controlling an EV200 main bus shut off solenoid, BP220 to control the PV charge wired as a relay controlled from the 123SmartBMS and BP100 set up to control 12v loads, 123SmartBMS, 800 Ah of Winston cells in a 2p4s configuration.
The Multiplus was set up with the 2-wire assistant and the default lithium settings of Abs 14.2v and Float 13.5v; the 123SmartBMS was set to default Vmin 2.95v, Vmax 3.45v, Vbypass 3.4v. MPPTs to Lithium setting.
Charge Restart 95%, Discharge Restart 20% .I really don't understand what these mean in practice in terms of cell voltage. Please help.
The battery hovered around the float voltage of 13.5v.
With the above settings and connected to shore power the battery discharged from about 13.5v (3.5v/cell) to 13.0v more quickly than desireable and did not increase in voltage above the absorption setting of so a lot of potential power went unrealized.
I then raised the 123SmartBMS to Vmax and Vbypass each to 3.5 v/cell (battery voltage 14.0v) and the Multiplus to Abs 14.2v and Float 13.80v which gave me a greater capacity for discharge.
Now the battery hovers around the float votage of 13.80v (shore power).
When switching on the solar to this installation (and disconnecting shore power) from a battery charged to 13.8v I have to wait until the battery discharges down to 13.23v before the 123SmartBMS charge relay switches on to charge the battery from the PV panels. The problem is that by this time I have missed all the morning sunshine that could have been pouring into the battery.
What needs to be done to take advantage of all the day's sun?
Thanks in advance, I have found this site very helpful for my design.