Review on Victron Energy Cyrix: Efficient Battery Combiner for Optimal Power Management by Mike Bucher

We have an old motorhome from 1984 and the only way to charge the starter battery is by (a) starting the engine or (b) connecting an external charger/maintenance device. I have used an external charger at a serviced campsite in the past to keep the starter battery always ready to go. I've read about these devices from other RV owners and thought they would be a good way to keep the starter battery charged when the RV is connected to shore or solar power. No external charger required. I also like the fact that this unit has a "Starter Assist" feature that temporarily connects (connects) the starter battery to the house battery simply by pressing the external push button switch. After installation, the starter battery showed almost 13 V DC (12.9) when the mobile home was connected to the land network. Later that day, the voltage reading was above 13.5 V. The next day, the voltage reading stabilized (steadily) at 14.06 V.