Set the minum state of charge to the specified value, or zero if it's a maintenance day and the --check-maintenance paramenter is set.

set-minsoc.py

#!/usr/bin/env python3

import argparse
import dbus
import logging
import requests
from datetime import datetime

# Note that when log output lands in /var/log/messages via cron, lines are
# truncated at about 250 characters for some reason.
logging.basicConfig(level=logging.INFO, format='set-minsoc.py: %(levelname)s: %(message)s')
logger = logging.getLogger(__name__)

HOURS = 60 * 60
DAYS = 60 * 60 * 24

def is_maintenance_day():
    # If it's less than 24 hours until maintenance is due when
    # this script is run, we know today is a maintenance day
    status = requests.get(f'http://{args.bms_ip}:3000/rest/1.0/status').json()
    strip_pump_run_target = status['list'][0]['strip_pump_run_target']
    strip_pump_run_timer = status['list'][0]['strip_pump_run_timer']
    next_strip = strip_pump_run_target - strip_pump_run_timer
    return next_strip / DAYS < 1.3

def set_min_soc():
    try:
        bus = dbus.SystemBus()
        o = bus.get_object('com.victronenergy.settings',
            '/Settings/CGwacs/BatteryLife/MinimumSocLimit')
        if args.check_maintenance and is_maintenance_day():
            o.SetValue(0)
            logger.info("Set MinSOC 0% (maintenance day)")
        else:
            o.SetValue(args.min_soc)
            logger.info(f"Set MinSOC {args.min_soc}%")
    except Exception as e:
        logger.error(e)

   
if __name__ == "__main__":
    parser = argparse.ArgumentParser("Set MinSoC")
    parser.add_argument("bms_ip", help="ZCell BMS IP address")
    parser.add_argument("min_soc", help="Minimum SOC to set")
    parser.add_argument("--check-maintenance", help="Sets MinSOC to zero if it's a maintenance day",
                        action="store_true")
    args = parser.parse_args()
    set_min_soc()