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matt5ash

Stand By Electrical Power

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Hi ... My coach uses about 4 watts of stand by power, that is power when all appliances, lights, etc. are turned off, but the 12 volt cutoff relay is still engaged. Is this a typical stand by power usage ?? thanks --matt

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That is actually fairly low as far as “phantom” draws go in an RV.  Unless you completely disconnect the battery bank from the RV, there are almost always little phantom draws pulling power (even when nothing appears to be turned on).  An example is the LP gas detector or a clock memory or other similar devices.

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4 watts is 0.33 amps at 12 volts.  It will take 151 hours (6.3 days) to drain a single 100 amp-hour battery to the 50% charge level.  Not too bad.

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The LP detector in our 2017 Class C draws amperage when the battery relay is off and shore power disconnected.  Dealership said that it is required now (safety reasons) for the LP detectors to be powered even when the battery relay is off and shore power disconnected.  

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On 5/13/2020 at 6:20 PM, Lou Schneider said:

4 watts is 0.33 amps at 12 volts.  It will take 151 hours (6.3 days) to drain a single 100 amp-hour battery to the 50% charge level.  Not too bad.

thanks !! I guess that a couple of 100 AH lithium batteries will take even longer

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16 hours ago, matt5ash said:

thanks !! I guess that a couple of 100 AH lithium batteries will take even longer

Lithium batteries can be drained to their full capacity, so figure a pair of 100 amp-hour lithiums can deliver 4 times as much usable power as a single 100 AH lead acid battery that should only be drained to the 50% level. 

Edited by Lou Schneider

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thank you Lou !!

We installed two batteries so there would be enough cranking power (via specs anyhow) to start the generator. So far, the system is working 🙂

 

--matt

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