DVCC: Add configurable charge voltage limit for managed batteries

[izak]

In some cases, the installer may want to override the charge voltage sent by a managed battery.

The case to solve with this is a temporary condition where there is an imbalance in a brand new battery that simply needs time to balance. A lower charge voltage limit can then be set, allowing room for the high cell and time to balance.

Proposed implementation:

• This will work similar to the present quirk architecture already in place for some batteries.
• As before, where such a voltage is set the lower of this voltage and the one sent by the battery will be used.

TODO

• Add to systemcalc
• Add setting in GUI
• Log to VRM
• Add to modbus-tcp

[mpvader]

@izak how would enabling this new feature affect:

a) an ESS system with lead batteries, a Multi and solarchargers?
b) a non-ESS system of the same config?
c) a system with DVCC off? (I would assume no effect)

[mpvader]

And @izak the title of this issue talks about a configurable override charge voltage setting. Is that what it is? Or is it a user configurable upper limit for the charge voltage? Which would leave the system operating as is, accepting also any lower charge voltage setpoints, but limiting them to the configured value.

[izak]

a) an ESS system with lead batteries, a Multi and solarchargers?

Only affects systems with a BMS, so no change in systems with a lead acid battery. The charge voltage configured on the Multi is used.

b) a non-ESS system of the same config?

In a system with a managed battery, the solar chargers will use the lesser of this setting, or what the battery asked for.

In a system without a managed battery, this setting has no effect.

c) a system with DVCC off? (I would assume no effect)

Completely ignored, only used with DVCC.

The labels in the GUI is "Limit managed battery charge voltage", and it is only shown if DVCC is on. So I believe this should be clear to the user.

title of this issue talks about a configurable override charge voltage setting. Is that what it is? Or is it a user configurable upper limit for the charge voltage?

It is the second one, so technically the title of the issue isn't accurate. It is a user configurable limit, but it will not allow the user to exceed the voltage sent by the managed battery.