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The following additions are proposed to the Battery DGNs to help load management and prevent unnecessary DC disconnects when possible. DGNs are designed to mirror existing DC_SOURCE_STATUS_4 which is used in similar manner to control charging devices.

Also proposing consideration to rename BATTERY_STATUS_4 to BATTERY_CHARGE_CONTROL which better describes their purposes.

A typical use scenario in an RV is where the Inverter would stop 120VAC loads, which are often high power and non-critical when battery is getting low, but still has certain reserve which can be allocated to more critical DC loads such as lights, fans, DC compressor fridge, etc.
This would prevent or delay imminent loss of DC power by delaying Low Battery Disconnect from the BMS.

Currently we only expect to use Desired Load State 0 and 1, only with RV-C enabled 120VAC inverters.
In the future more intelligent power distribution devices can use additional Desired Load States to select between critical and non-critical load