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Car Forum / Driving, Maintenance, Tuning / RVs / August 20061250W Power Inverter current draw
I have a 1250W (2500W peak) power inverter for use in my Tent Trailer, and was trying it last weekend. I tried with a coffee maker (which I know are pretty hungry things). I have a 30A fuse going between the power line and the battery, which was getting tripped all the time. Do you think its valid to draw 30A or more from the battery when trying to supply 1000W to a device? > I have a 1250W (2500W peak) power inverter for use in my Tent Trailer, > and was trying it last weekend. [quoted text clipped - 7 lines] > > to supply 1000W to a device? In order to get 1200 watts delivered to the inverter it will draw 100 amps from the battery. This does NOT allow for any loss in the inversion! > I have a 1250W (2500W peak) power inverter for use in my Tent Trailer, > and was trying it last weekend. [quoted text clipped - 6 lines] > Do you think its valid to draw 30A or more from the battery when trying > to supply 1000W to a device? 30A at 12 Volts = 360 watts. Your coffee maker probably pulls close to 1000 watts. If you are dry camping without hookups then you need to find ways to do without any high power devices. Use a stove top percolator coffee maker. No TV, No microwave, limited light use etc. Otherwise you're gonna have a dead battery in 1 day or less. Duh.. get a 12v coffee maker... damn why if your using 12V don't you stay with what you have rather then trying to reinvent the wheel..... And no a Coffee maker will not run over 15 Amp on draw since they run at home just fine and you only have 15 amp breakers on most of your circuits there... geesh you guys.... >> I have a 1250W (2500W peak) power inverter for use in my Tent Trailer, >> and was trying it last weekend. [quoted text clipped - 12 lines] > percolator coffee maker. No TV, No microwave, limited light use etc. > Otherwise you're gonna have a dead battery in 1 day or less. > Duh.. get a 12v coffee maker... damn why if your using 12V don't you stay > with what you have rather then trying to reinvent the wheel..... And no a [quoted text clipped - 18 lines] >> coffee maker. No TV, No microwave, limited light use etc. Otherwise >> you're gonna have a dead battery in 1 day or less. That 15 amp draw at home is on 110V. 10 times the voltage off your battery. Volts times amps equals power in watts. It the coffee maker drew 10 amps on 110v, then you would have an 1100 watt draw. divide the 1100 by 12 to get the amps on a 12 volt circuit. Plus a few more amps for conversion loss. > Duh.. get a 12v coffee maker... Not bad but I have an even better idea: Get a propane-fired, drip coffeemaker! <http://housewares.about.com/od/coffeemakers/qt/colemancoffeem.htm> With an ultr-quiet generator and 100-ft long, 12-gauge extension cord, I can make a pot of drip coffee without disturbing ANYONE. Even so, that's still a lot of hassle, so I am probably going to get the above-mentioned appliance for use in my travel trailer when "dry" camping. The inverter will come later, probably MUCH later - and then NOT for powering electric-resistance-heated devices! Sheesh! Get a generator or, better yet, a propane-powered solution for those high-draw appliances.  Signature:) JR 2000 Skamper Ultra 249 TT 2002 Chevrolet Silverado 2500HD Vortec 8100 - Allison 1000 >>Duh.. get a 12v coffee maker... > [quoted text clipped - 10 lines] > electric-resistance-heated devices! Sheesh! Get a generator or, better yet, > a propane-powered solution for those high-draw appliances. Jim do they make a microwave like that??? TIC > Jim do they make a microwave like that??? TIC Ha! :) Seriously, I wouldn't be too surprised. I still think it's amazing they can cool - and even FREEZE - with a heat source. Too bad, really, since without that technology, there would be A LOT more camping sites from which to choose! <selfish grin> Signature:) JR > Duh.. get a 12v coffee maker... damn why if your using 12V don't you > stay with what you have rather then trying to reinvent the wheel..... > And no a Coffee maker will not run over 15 Amp on draw since they run at > home just fine and you only have 15 amp breakers on most of your > circuits there... geesh you guys.... You are making the mistake of equating 15amps at 110vac to 15amps at 12vdc. A 10amp/110VAC device pulls 1100 watts. At 12vdc its still going to pull 1100 watts but at a far higher amperage (watts = volts * amps). At only 12vdc you'll need 91.66amps to provide the needed 1100 watts. This is why the 30amp 12vdc breaker trips. >> I have a 1250W (2500W peak) power inverter for use in my Tent Trailer, >> and was trying it last weekend. [quoted text clipped - 12 lines] >percolator coffee maker. No TV, No microwave, limited light use etc. >Otherwise you're gonna have a dead battery in 1 day or less. TV not really a power hog. 90-100W typically. As for coffee, one word: PROPANE Tom >>> I have a 1250W (2500W peak) power inverter for use in my Tent Trailer, >>> and was trying it last weekend. [quoted text clipped - 17 lines] > > Tom Probably about 10 amperes for the TV. For long battery life I try to limit the discharge to 50% state of charge. With a pair of golf cart batteries I can run the TV for about 10 hours before charging them up again. I have a little Honda generator and put a little back in each day, If you have a TV that runs on 12 volts, unplug it when not in use. It may draw a more than just a tiny bit of current when turned off. In article < .294716$mF2.27451@bgtnsc04-news.ops.worldnet.att.net>, > If you have a TV that runs on 12 volts, unplug it when not in use. It > may draw a more than just a tiny bit of current when turned off. Oooo! Good reminder! :) It also reminded me that, when running on the battery, turn OFF the television antenna AMPLIFIER - the little, green LED light by the TV connections. Leaving that on may well draw some considerable current from the battery. At least I ASSUME it does. Don't all amplifiers of any worth have at least a modest power need? I suppose I could RTFM. Now WHERE did I stash the owner's manual for my Winegard "batwing"-style, crank-up antenna system? It's the LITTLE things that can add up! Signature:) JR > In article < > .294716$mF2.27451@bgtnsc04-news.ops.worldnet.att.net>, [quoted text clipped - 14 lines] > > It's the LITTLE things that can add up! That doesn't take much. I doubt more than about 10 milliampere. I measured the keep alive current to a 13 inch DC TV once and found it amounted to something like a half ampere. ... > As for coffee, one word: PROPANE Bingo. Heat the water on a propane stove. For coffee, I've used at different times the following: instant coffee (bletch!!), Melita funnels with filters (best), and coffee bags (pretty good and convenient). > TV not really a power hog. 90-100W typically. Thats true but if dry camping then 100 watts is enough to drain a battery quickly. I dry camp for up to 5 days with a single battery. I have no trouble making it last. The furnace fan is another hog. It will drain a battery in 1 or 2 nights if run very much. |
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