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Open Roads Forum  >  Tech Issues  > Talk about voltage drop (12v) Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  |  Oldest first Newest first  Page of 2   Next wopachop • View posts Who run bartertown Senior Member Joined: 11/17/2006 View Profile Offline Posted: 08/03/21 01:19pm Link  |  Quote  |  Print  |  Notify Moderator Have the trailer in boondocking mode. Some old batteries and 150w of solar. The batteries are showing 13v. I have a little 300w inverter to charge my laptop and things. 14 gauge wire is feeding the little inverter and the USB panel. Doesnt that seem weird its dropping below 12v and only pulling 3amps? wopachop • View posts Who run bartertown Senior Member Joined: 11/17/2006 View Profile Offline Posted: 08/03/21 01:23pm Link  |  Quote  |  Print  |  Notify Moderator Should mention the circuit is roughly 15 feet long and i believe 14 gauge wire feeds it. I tapped in and added another couple feet of 14 gauge wire up to the USB panel. Its been a couple years but im pretty sure im on a dedicated circuit. I might have tapped into the electric awning. Point being i dont think there is any other load besides the 3amps. enblethen • View posts Moses Lake, WA Senior Member Joined: 01/05/2005 View Profile Posted: 08/03/21 01:32pm Link  |  Quote  |  Print  |  Notify Moderator Sounds about right! Bud USAF Retired Pace Arrow 2003 Chev Ice Road Tracker theoldwizard1 • View posts SE MI Senior Member Joined: 09/07/2010 View Profile Offline Posted: 08/03/21 02:53pm Link  |  Quote  |  Print  |  Notify Moderator What brand is that panel meter ? Some inexpensive meters are known to be off by 10%. time2roll • View posts Southern California Senior Member Joined: 03/21/2005 View Profile Good Sam RV Club Member Posted: 08/03/21 03:04pm Link  |  Quote  |  Print  |  Notify Moderator #14 and 300 watts... is that the fuse? Or is that by design so the inverter will drop out before the fire ensues? 2001 F150 SuperCrew 2006 Keystone Springdale 249FWBHLS 675w Solar pictures back up wopachop • View posts Who run bartertown Senior Member Joined: 11/17/2006 View Profile Offline Posted: 08/03/21 03:22pm Link  |  Quote  |  Print  |  Notify Moderator Hmm good point. It's that little red cube. Maybe a 150W. enblethen • View posts Moses Lake, WA Senior Member Joined: 01/05/2005 View Profile Posted: 08/03/21 03:59pm Link  |  Quote  |  Print  |  Notify Moderator The meter and LEDs add to the load. There is losses within the unit that draws power. pianotuna • View posts Regina, SK, Canada Senior Member Joined: 12/18/2004 View Profile Offline Posted: 08/03/21 04:06pm Link  |  Quote  |  Print  |  Notify Moderator #10 wire would be much better. I would expect 7.5% voltage drop with 15 feet of #14 and the loads. Regards, Don My ride is a 28 foot Class C, 256 watts solar, 556 amp-hours of Telcom jars, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start. wa8yxm • View posts Davison Michigan (East of Flint) Senior Member Joined: 07/04/2006 View Profile Offline Posted: 08/03/21 05:33pm Link  |  Quote  |  Print  |  Notify Moderator 300 watts is about 30 amps at the battery 14GA is good for half that at 120 volt and even less at 12 volt due to voltage drop. Plus there is a voltage drop INTERNAL to the batteries (I do not know how much) The key to battery/inverter is three fold One, Keep the leads as short as you can but do not mount the inverter inside the same space as the batteries Two HEAVY cable for a 300 watt Starter cable works very well and is low cost up to around 750 watts it works well. long about 1000 it might be a bit...er.. anemic 3: for as much of the run tape or wire loom the cables like this ============ Side by side. This is more important on larger inverters. AND MORE battery never hurts.. DEEP CYCLE batteries work best for House use. (As opposed to MARINE/deep cycle) note how I use case on those) Home was where I park it. but alas the. 2005 Damon Intruder 377 Alas declared a total loss after a semi "nicked" it. Still have the radios Kenwood TS-2000, ICOM ID-5100, ID-51A+2, ID-880 REF030C most times wopachop • View posts Who run bartertown Senior Member Joined: 11/17/2006 View Profile Offline Posted: 08/03/21 06:06pm Link  |  Quote  |  Print  |  Notify Moderator I'm seeing voltage drop along the wire correct? Not battery sag? The test is during the day with solar hooked up. Only drawing 3amps. Why dont I see similar voltage drop while on shore power? Pretend the Led display read 14v. When I apply the same 3a load why doesnt the display show 12-13 volts? I understand that higher voltage sags less. But we are only talking the difference of 12v boondocking to 14v on shore power. Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  |  Oldest first Newest first  Page of 2   Next Open Roads Forum  >  Tech Issues  > Talk about voltage drop (12v)

Search:   Advanced Search Search only in Tech Issues

Jump to Forum Dear Marcus  - Good Sam Roadside Assistance  - Good Sam Club  - Good Sam Insurance  - Camping World Accessories  - Camping World RV Sales  - Good Sam Extended Service Plan  - Camping World Service and Inst...  - Coast to Coast Recreational Vehicles  - Class A Motorhomes  - Class B - Camping Van Conversi...  - Class C Motorhomes  - Fifth-Wheels  - Folding Trailers  - Hybrid Travel Trailers  - Travel Trailers  - Truck Campers  - Toy Haulers Camping  - Tent Camping  - Family Camping  - Workamping Forum General Forums  - Beginning RVing  - Rallies, Shows and Gatherings  - General RVing Issues  - RV Lifestyle  - Full-time RVing  - Camp Cooks and Connoisseurs  - RVing with Disabilities and Ge...  - RV Pet Stop Technical Resources  - Tech Issues  - Do It Yourself Modifications a...  - Towing  - Tow Vehicles  - Dinghy Towing  - Technology Corner  - Forum Posting Help and Support Locations  - RV Parks, Campgrounds and Attr...  - Roads and Routes  - Public Lands, Boondocking and ...  - RVing in Canada and Alaska  - RVing in Mexico and South Amer...  - Snowbirds Other Discussions  - Around the Campfire

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