matt5ash Posted May 13, 2020 Report Share Posted May 13, 2020 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 Quote Link to comment Share on other sites More sharing options...
Chad Heiser Posted May 13, 2020 Report Share Posted May 13, 2020 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. Quote 2000 Kenworth T2000 w/ Cummins N14 and autoshift 2017 DRV Mobile Suite 40KSSB4 with factory mods, dealer mods and personal mods - now in the RV graveyard 2022 DRV Full House MX450 with customized floor plan 2018 Polaris RZR Turbo S (fits in the garage) 2016 Smart Car (fits in the garage or gets flat towed behind the DRV when the RZR is in the garage)My First Solar Install ThreadMy Second Solar Install Thread & Photos and Documents Related to the buildMy MX450's solar, battery and inverter system - my biggest system yet! chadheiser.com West Coast HDT Rally Website Link to comment Share on other sites More sharing options...
matt5ash Posted May 13, 2020 Author Report Share Posted May 13, 2020 thank you !! Quote Link to comment Share on other sites More sharing options...
Lou Schneider Posted May 13, 2020 Report Share Posted May 13, 2020 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. Quote Link to comment Share on other sites More sharing options...
StraitRVing Posted May 15, 2020 Report Share Posted May 15, 2020 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. Quote Richard "Doc" Strait, USN Retired 2017 Coachmen Leprechaun 319MB Point of Contact for the Military, Veterans, and Gold Star Families BOF Link to comment Share on other sites More sharing options...
matt5ash Posted May 18, 2020 Author Report Share Posted May 18, 2020 Thanks ... and thanks for the info about the propane detector. --matt Quote Link to comment Share on other sites More sharing options...
matt5ash Posted May 18, 2020 Author Report Share Posted May 18, 2020 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 Quote Link to comment Share on other sites More sharing options...
Lou Schneider Posted May 18, 2020 Report Share Posted May 18, 2020 (edited) 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 May 18, 2020 by Lou Schneider Quote Link to comment Share on other sites More sharing options...
matt5ash Posted May 22, 2020 Author Report Share Posted May 22, 2020 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 Quote Link to comment Share on other sites More sharing options...
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