The 24v systems that employ 12v batteries can be recharged with a 12v alternator by simply being plugged in like any other 12v battery.
24v 24 volt charging system diagram.
150 amps is the limit for cost effective cabling switching breakers fusing.
The most popular way to charge a 24 volt trolling motor battery system is with an onboard two bank battery charger like the minn kota mk220d.
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.
24 volt starting system 2.
If over 3kw indeed go for 48 volt system.
Up to 3kw max demand a quaility 24 volt inverter would still be ok.
Basically there are 3 separate electrical systems within the one main system.
The 24 volt electrical system.
It is important to note you should never feed more voltage into a motor than what it is rated for ie.
Depending on how you wire a two battery 12 volt system the result can be a 12 volt system or a 24 volt system.
If the 24v system uses an actual 24 volt battery the electricity will have to pass through a voltage converter before it goes from the 12 volt alternator to the battery.
Another option for charging your 24 volt battery bank is to use a 24 volt charger like the samlex sec 2425ul.
The electrical system used on john deere diesel tractors with electric start is a 24 volt split load system.
12 volt system controlling one side of the tractor 3.
24 volt wiring diagram.
12 volt system controlling the opposite side.
The rule of thumb is max current demand from inverter should not be over 120 140amps.
Never feed 24 volts into a 12v motor.
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.