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Location: 31 | Good question! Perhaps somebody with electrical background can chime in.
I'll take an educated guess that one would not be needed because you're only going to be running one charging system at a time anyway. Even if you didn't, it's probably similar to when you're jump starting a car battery from another car or with one of those battery chargers designed for it. I’ve never had a problem after a lot of miles without one... will "try" to describe how my boat is rigged now.
I have my boat set up with 2 main batteries, one mainly for the motors and one mainly for the boats electronics, I say mainly because they are hooked up parallel with an almost trickle charge automatic six amp battery charger tending both batteries.
I also have 3 TM batteries with a 20 amp 36V charger and 2 separate breaker switches that isolate the TM, as well as the lead coming in from the stealth one charger that's hooked up to the main battery (s). So basically before I plug in the 20 amp all I have to do is throw those 2 breakers and the TM batteries are completely isolated. 100% recommend breakers to isolate.
With the TM breaker open, the stealth one not only charges all 5 batteries while the boat is running, it also charges all 5 when I plug in the six amp maintenance charger that I leave plugged in whenever the boat is not in use.
Another good accessory I use is one of those gauges that you can monitor all of the batteries individually with just the flip of a switch, they're inexpensive and easy to hook up.
Although this may sound complicated, it's really not that bad and is far away best system that I have ever owned… lots of protection and versatility. Although there's no way to say for sure … I'm still supremely confident my batteries have (and will) last longer utilizing the same Stealth unit that I've been running for about 15 years on 2 different boats.
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