Railbus Chargers 
Nelson Riedel, Nelson@NelsonsLocomotive.com
4/6/2017, last updated
05/20/2017
 
A few words about the chargers are in order:



The image above shows how the charger is mounted in the back of the cab area.  The charger is mounted upside down so the cables can be routed to the batteries easily.  The 115V input cable is stored in the cab when not in use. 

The image on the right shows the charger right side up.  It has a 10 amp capability and charges each battery independently --- 5 amp capability each battery.    I leave the charger connected permanently.  It can be plugged in all the time and  the batteries just float when fully charged.    It's important to charge each battery independently.  I don't think this model is available anymore.    Some newer models show the status of each battery on the charger.   


This photo shows the installed batteries.  The negative terminals are at the back (left).   A charger lead goes to each battery terminal.  There is a fuse in each charger lead.   The front (+) terminal  of the rear battery is connected to the rear (-) terminal of the front battery. The rear terminal of the rear battery is the zero voltage reference.  + 12 volts is taken from the middle terminals and + 24 volts from the front terminal of the front battery.  The +12 volt and + 24 Volt leads go to circuit breakers in the upper right corner.





This is a close-up of the upper right corner with the 20 amp breaker for 12 volts and 90 amp for  24 volts.  The tall black brass hex nut  (1/4"-20) in the lower left secures the battery hold down bar and is a stand-off for the battery cover.    





This shows the battery cover in place.    The negative terminal of the rear battery ( zero voltage terminal)  is visible on the left.   As mentioned elsewhere, 24 volts is not a shock hazard but the tremendous energy stored in the batteries can cause violent reaction if a tool is dropped across the terminals.

The handset comes with a charger powered from 115 volts with output  of 12 volts at 1 amp.   A concern is that I forget to charge the handset so I provided 12 volts from one of the batteries.   The plug is of the type shown above.  I wired it directly to the lower battery and put an in-line 2 amp fuse in series with the + 12 volt lead.  The handset can be powered via this cord if it's batteries are discharged.   The handset can also charged via this plug instead of the AC charger but can drain the main battery if left for long periods unless the main charger is powered.     

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