big boy battery isolator relay wiring diagram

BIG BOY BATTERY ISOLATOR RELAY WIRING DIAGRAM FULL

BIG BOY BATTERY ISOLATOR RELAY WIRING DIAGRAM FULL

I strongly suspect that all the 'controller' does here is supply the full 24 volts (or 12, as applicable) for a short period of time to pull the plunger, then reduces the voltage to something less to hold it in the closed position for the duration. (emphasis mine), taken from the product specification: The 200 amp version is not a continuous duty unit and requires an Intellitec Isolator - diesel controller to prevent it from overheating when it is used for continuous duty. But because of the lineage, it requires a whopping 6 amps to pull the plunger.įor this reason, Intellitec does not permit it to be used in a continuous application without connecting it to their proprietary 'Diesel Battery Controller,' per the following: This item is basically back-engineered from the 'Big Boy' disconnect, omitting the patented magnetic latch mechanism that, frankly, is the only real reason to buy from Intellitec in the first place. AFAIK, they do not market it with the name 'Big Boy.' It is their part number 77-90006-240 (or -120 for the 12-volt model). It occurred to me later in the day that Intellitec does sell a non-latching solenoid similar to the 'Big Boy' disconnect. If you apply a continuous voltage to this coil, as you would to a standard NO contactor, you will overheat the coil and possibly damage it. Lastly, note that the latching 'Big Boy' solenoid is intended to be operated by a momentary application of voltage to the operating coil.

OTOH, if you have a standard, Normally Open (NO) solenoid, then there will be a certain amount of heat generated by the operating coil itself, even if no current is flowing across the contacts. However, they should not get 'untouchably hot' unless there is a problem. These solenoids will get hot to the touch at higher current loads. I am guessing your alternator is the 24-volt 50DN model, which can only supply a sustained 270 amps anyway, and with chassis loads accounting for a portion of that, you could not exceed the rating by much even if you tried. The 200 amps should be more than enough to run your air conditioner. The 'Big Boy' is rated for 200 amps continuous, 1,200 intermittent (30 seconds). Perhaps you have a different brand/model of solenoid in this application? The Intellitec 'Big Boy' 200 amp isolator solenoid is a latching relay, by definition.

Big boy battery isolator relay wiring diagram