Why you need to isolate your batteries

Many vehicles as well as boats have multiple batteries, e.g. one to start the engine and others to power accessories. In order to understand the effects of multi-battery drain an how our battery isolators prevent it, one has to think of electricity as water. Electrical current is equal to the fl ow of water, and voltage is equal to the pressure. An alternator delivers current (water) into the batteries (storage tanks) and the current then fl ows through wires (pipes) to the accessories.

In our example, batteries have to be regarded as storage tanks. If a fully charges battery is connected parallel with a discharged or empty one, voltage pressure in the full battery will force its current into the empty battery until the current stored in both batteries reaches a common level. Independent of how many batteries are installed in a vehicle, accessories connected to one will draw capacity from the other batteries in the circuit. That is exactly the problem of multi-battery drain.

Solenoids

One way of solving the multi-battery drain is using solenoid, i.e. a switch that disconnects batteries from There will not be any battery drain as long as the batteries are disconnected, but as soon as they are reconnected, the drained battery will empty the starting battery - perhaps too low! Furthermore, the sudden enforced transfer of energy from one battery to another is likely to damage batteries or at least shorten their life. In the worst case, fi re could LEAB solenoids are electronically controlled high-performance relays and were especially developed for the application with multiple battery on-board systems. Separation reconnection of the batteries depends on the voltage starting battery, i.e. consumer batteries will be reconnected only after the starting battery was recharged to a certain level.

Our relays can be refitted into CAN-Bus-controlled vehicles without a problem, because there no signal transmission necessary from the on-board electronic system.

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LEAB EDR electronic distribution relay

The LEAB EDR is an electronic voltage controlled high capacity relay which is connected between two battery banks and uses the voltage either from one or both batteries as reference for switching. It allows multiple batteries to be charged from one charging source. In a vehicle with an onboard battery charger connected to the aux. battery this battery will usually be charged primarily. Especially with longer standing time it makes sense to charge the starter battery as well, in order to guarantee a 100% start ability. With the LEAB EDR one can switch the starter battery and the aux.battery parallel during charging and still keep the safety advantage of separate circuits.

TYP	Batt.-Voltage	max. Batt.-Voltage	Charge-Current	max. Batt.-Kapacity	Price inl. VAT
EDR 12V/75Amp	12 V	18 V	75 A	400 Ah	nur 116,95
EDR 24V/50Amp	24 V	30 V	50 A	250 Ah	125,16

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