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otrfun

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Posted: 03/20/21 07:07pm Link  |  Quote  |  Print  |  Notify Moderator

Does the typical battery isolator subject the vehicle battery to any parasitic current when they're in the "cut-out" mode (secondary battery disconnected)?

BFL13

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Posted: 03/20/21 07:56pm Link  |  Quote  |  Print  |  Notify Moderator

With the ignition off, the isolator keeps all house loads from the starting battery. BUT the starting battery still has its own parasitic loads on it from the engine computer , dash clock etc.

Some put a small charger on the starting battery to maintain it while the RV is parked and isolator is "open", while the house batts are maintained by something else.


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MEXICOWANDERER

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Posted: 03/20/21 08:27pm Link  |  Quote  |  Print  |  Notify Moderator

ISOLATOR covers a large territory. Which type do you have??

pianotuna

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Posted: 03/20/21 10:29pm Link  |  Quote  |  Print  |  Notify Moderator

otrfun wrote:

Does the typical battery isolator subject the vehicle battery to any parasitic current when they're in the "cut-out" mode (secondary battery disconnected)?


If the isolator is a relay, or solenoid, then no.


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pianotuna

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Posted: 03/20/21 10:50pm Link  |  Quote  |  Print  |  Notify Moderator

Some folks use a Trik-l-Start to maintain the Chassis battery.

wa8yxm

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Posted: 03/21/21 04:14am Link  |  Quote  |  Print  |  Notify Moderator

There are two basic types of battery isolators and on one of them two control systems
Diode isolators have no control system bit it is possible they may present a tiny "leakage" current.. I doubt you'd be able to measure it it's that small.

Relay isolators when isolated it's 100 percent no leakage but the control system may have a voltage sensor that "draws again a very tiny amount a very very tiny amount.


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otrfun

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Posted: 03/21/21 04:20am Link  |  Quote  |  Print  |  Notify Moderator

MEXICOWANDERER wrote:

ISOLATOR covers a large territory. Which type do you have??
Haven’t purchased one yet. This isolator (and many rebranded versions of it) appear to be very popular on Amazon.

theoldwizard1

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Posted: 03/21/21 07:10am Link  |  Quote  |  Print  |  Notify Moderator

This is why every RVer should have a "clamp meter" to quickly and easily measure current.

Uni-T B4Q094 UT210E True RMS AC/DC Current Mini Clamp Meter

Tom_M

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Posted: 03/21/21 07:34am Link  |  Quote  |  Print  |  Notify Moderator

If you buy a clamp meter make sure that it will measure DC amps. Many of them will only measure AC.


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otrfun

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Posted: 03/21/21 07:52am Link  |  Quote  |  Print  |  Notify Moderator

theoldwizard1 wrote:

This is why every RVer should have a "clamp meter" to quickly and easily measure current.

Uni-T B4Q094 UT210E True RMS AC/DC Current Mini Clamp Meter
Agree. I own several clamp ammeters. Unfortunately, it's hard to measure the parasitic current of something you don't yet have or own; hence the reason for my post.

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