You can use a 24 volt charger or a 12 volt two bank charger.
Charging 24 volt system with 12 volt charger.
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If your charger is small enough to be carried aboard your boat you can leave these cables in place since the charging procedure requires it.
As we learned in basics of electricity current always flows from higher potential to lower potential.
Some 24v systems actually employ a series of linked 12v or 8v batteries.
It s a 24 volt system but it s actually two 12 volt batteries tied together.
If your boat has a 24 volt battery system it probably has two 12 volt batteries that are wired together so that the negative post of the first battery connects to the positive post of the second battery.
That s way in some cases.
I have a 12 volt battery tender here.
While most vehicles use a 12 volt 12v electrical system many buses and some boats utilize a 24 volt system.
Cars trucks rvs and motorhomes run dual 12 volt batteries for various reasons.
As far as charging boat batteries on the water test your system on land and always use the correct size fuse and proper gauge wires safety.
The batteries look like this.
I ve already tried connecting them and in the second picture is the only way that the battery charger will actually charger it will not charge any other way that i connect them.
No you can not.