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Old 05-13-2023, 03:39 PM   #1
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Question Battery disconnect no longer works?

Replaced my 2 house batteries about a year ago and installed a quick disconnect at that time. When storing my Motorhome I leave one light on, then loosen my disconnect knob until the light goes out so I know the batteries are not connected and won't be drained by the carbon monoxide detector or other things not switched off by the manufacturer installed switch. I leave that switch in the ON position always. Returned from a trip a few days ago, parked and disconnected batteries as described above. Returned today to do some cleanup, reconnected batteries, started generator , turned on A/C and finished up around 15 min later. Turned off A/C, generator, loosened my disconnect knob but the light did not go out? Huh? Thought maybe my switch was bad so I completely removed the knob/bolt to physically disconnect the ground wire thar leaves the battery compartment, however the light remained on. I'm at a loss as to whats going on here. Electricity is not my strong suit but this has been working without fail for a year now. I had to turn the manufacturer installed switch to the off position before the light would go out. Is it possible the generator had some part in this? I'm clueless. Will try to attach pic of my battery setup.
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Old 05-13-2023, 08:04 PM   #2
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Quote:
Originally Posted by Skynardo View Post
Replaced my 2 house batteries about a year ago and installed a quick disconnect at that time. When storing my Motorhome I leave one light on, then loosen my disconnect knob until the light goes out so I know the batteries are not connected and won't be drained by the carbon monoxide detector or other things not switched off by the manufacturer installed switch. I leave that switch in the ON position always. Returned from a trip a few days ago, parked and disconnected batteries as described above. Returned today to do some cleanup, reconnected batteries, started generator , turned on A/C and finished up around 15 min later. Turned off A/C, generator, loosened my disconnect knob but the light did not go out? Huh? Thought maybe my switch was bad so I completely removed the knob/bolt to physically disconnect the ground wire thar leaves the battery compartment, however the light remained on. I'm at a loss as to whats going on here. Electricity is not my strong suit but this has been working without fail for a year now. I had to turn the manufacturer installed switch to the off position before the light would go out. Is it possible the generator had some part in this? I'm clueless. Will try to attach pic of my battery setup.
While the generator was running, your battery control center or BIRD device, connected the house and chassis batteries together for charging purposes. When you shutdown the generator, they stayed connected, as designed. Then you disconnected the ground on the house batteries. Since the positive house side was still connected to the chassis battery, your light stayed on, drawing from the chassis battery. Once you switched off the "salesman switch" that removed the chassis positive feed and out goes the light.

The answer is both disconnects serve a purpose. Salesman switch is great for short term disconnect and should always be used first. Battery disconnect ensures no parasitic draw on longer term parking.
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Old 05-13-2023, 11:26 PM   #3
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Generator running brought both batteries up to a charging voltage of around 13.6 volts. It's called a surface charge.

Once you shut down, the 13.6 volts takes some time for the surface charge to disapate down to 12.7, a battery's resting voltage.

During the time your bi-directional isolation/charging system is keeping the battery interconnect solenoid closed.

Had you waited a while, after opening your battery disconnect, the surface charge would have disapated and the interconnect solenoid would have opened and everything would have shut down, like your used to.
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Old 05-14-2023, 07:24 PM   #4
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Thank you, it's good to understand how things work. I visited my rig again today and everything was working as expected.
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Old 05-15-2023, 01:27 AM   #5
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The last time I did similar, I found still plugged into wall= duhhhh, need to do this job another day...
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