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Old 11-09-2014, 01:56 AM   #1
3 Rivet Member
Anchorage , Alaska
Join Date: Oct 2010
Posts: 167
Battery draw from 12v vs 110 LED

Just posted a thread asking for help with a broad introduction to the electrical systems of a travel trailer. But I have one specific question I need help with before I wrap up my riveting on the exterior skin. I have a small shroud I would like to use for an exterior porch light. As a porch light it could be on all night and trying to minimize the battery draw. I am having difficulty finding a reasonably priced exterior 12v fixture small enough to fit inside the housing. I am wondering if a 110 LED would have a significantly higher draw on the battery ? (I might have more options in the 110 arena)
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Old 11-09-2014, 06:30 AM   #2
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2009 27' FB Flying Cloud
1991 35' Airstream 350
Jay , Oklahoma
Join Date: Oct 2006
Posts: 1,671
The battery will not supply 120 volts AC directly. One would have to install an inverter to invert the 12 VDC from the battery into 120 VAC.

This inversion is fairly inefficient.

Were it me, I would keep searching for a 12 volt solution.

Best Regards,


Jeff & Cindy
'09 27FB Flying Cloud
'91 350 LE MH
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Old 11-09-2014, 07:08 AM   #3
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Livingston , Texas
Join Date: Nov 2012
Posts: 58
To answer your question, the battery draw will be considerably higher due to the inverter inefficiencies. But why would you leave the porch light on all night? Besides the constant draw on your battery, you will also be drawing down the good will bank account of your neighbors. If you need the light on when you approach the vehicle then install a motion detector. A good relationship with your neighbor is a much more effective security solution than lights.
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