The Relay Booster Module is an optional upgrade Kit to IBS-DBS and DBi-DBS
The RBM (Relay Booster Module) performs a Link Start from auxiliary battery even if the starter battery has failed completely. RBM fits into the wiring of the IBS 200Amp relay. RBM improves the link start support to 100%, if sufficient charge is still available in the auxiliary battery.
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In the case of a deep discharge of the starter battery (start up of engine from starter battery is no longer possible), the "Link" button on the IBS battery monitor (IBS-DBS/BM3 or DBi-DBS) is pressed. With the support from the RBM at starter battery voltage below 10V the start of the engine from the Auxiliary Battery (AUX) would be activated.
In very cold weather or when starting capacity is reduced the RBM supports the relay to make sure the contacts stay properly closed during link start, this extends the relay life.
The IBS Dual Battery System DBS with RBM only performs if at least one battery has enough remaining starting capacity for a start up of the engine.
New IBS Battery Monitors (BM with uC Technology) are equipped with a low battery alarm on both batteries. If this alarm starts to sound, then check your battery system before further traveling. If doing so the risk of having battery problems is very small and RBM is only there if things go totally wrong.
For best performance follow next steps:
The RBM (Relay Booster Module) has been designed as system optimization for the IBS Dual Battery Systems (IBS-DBS and DBi-DBS). The standard system installed allows a manual link (for a manual link start) if the Starter Battery shows more than 8.5V. We learned in rare cases when the starter battery collapses due to extensive discharge or when cells shorten out the starter battery can go down to 5V. In this case if RBM is installed the car can still be started with the manual link function with the support of the auxiliary battery (best result are achieved if auxiliary battery is in good shape and at least charged 50% or more).
Best link start functionality is achieved if the power wires between the batteries are 25mm2. For winch application we recommend 35mm2 and for Rallye/Trophy/construction trucks 50mm2.
The other Dual Battery System IBS-DBR needs no external RBM, as this module is already integrated.
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