Adding an auxiliary battery allows for a smaller alternator as well as makes it possible to turn-off the chassis while running the crane for a short amount of time.
See the bulletin on Chassis Alternators and Auxiliary Battery for EH Cranes for more details on battery type, wiring, etc.
The auxiliary power connection must be fused like the chassis battery. See the Crane Power Protection bulletin for further details.
NOTE: the auxiliary battery that is connected to the Voltage Switching Unit (VSU) on an EHC-5 or 6 cannot be used to power accessories since the VSU switches the connection to make 24V while operating the crane. Reference the VSU bulletin for more information and troubleshooting.
Isolation
Adding a switch or isolator such as the InPower ABS-200 (Auto Crane PN 305605000) module prevents the chassis battery from being discharged to the point the engine cannot be started. It also allows the chassis battery to supplement the ampacity to help keep the EH crane operating at top speed with full rating especially when the engine is not running.
The ABS-200 module allows the wire size for connecting to the chassis battery to be reduced to 2 ga with a 225 A fuse instead of running 00 ga with a 300 A fuse. The manual for the ABS-200 is linked below.
Last Update: April 30, 2021
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