Dumb question

[BradKW]

When I connect my charger feed to the battery, and also the line out of the battery, what prevents the higher voltage from the charger from bleeding back to the 24v line going to the fuse box?

 

[Optimistic Paranoid]

Nothing.  Nominal "12 volt" stuff works just fine on the 13.5 to 14+ volts chargers and converters provide, and I would presume the same applies to 24 volt systems.

I know on 12 volt systems, if applying an equalizing charge of 16 volts or so, you're supposed to unhook stuff like compressor fridges and other stuff that might be damaged by voltage that high when you are equalizing the system.

 

[29chico]

When I connect my charger feed to the battery, and also the line out of the battery, what prevents the higher voltage from the charger from bleeding back to the 24v line going to the fuse box?

It is all a matter of perspective.  Current will flow into and out of the fuse box only when you are powering loads out of the fuse box. Most "24v" loads should be able to handle 30v when the battery bank is being charged. John is correct about disconnecting certain loads when EQ'ing the battery bank as over 30v might cause damage.

What I am wondering is what are your 24v loads?  Are you converting it down to 12v at some point?

 

[speedhighway46]

The "navigation console" on my Peterbilt Motorhome conversion houses two identical Rand McNally GPS units. Frequently, at times when driving, they would lock up and quit working. They were very unreliable and could not be depended on. A hard restore and "repair" on the RM website was required to get them working again.

After a few years of this I was determined to find the root cause. Turns out they are both very sensitive to high voltage, which happened of course when I was driving. 13.8 vdc put them into a coma.

I bought two cheapo buck transformers off eBay, adjustable voltage input and output, and that solved the problem.

Whenever you may experience high voltage in your DC system, better protect your sensitive components, or disconnect them.

My experience . . .

 

[BradKW]

Thanks. Aside from the inverter, 24v powers just the fridge and a couple motors. Have a separate 12v system for lighting and misc so not planning to convert at this point