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Old 08-13-2019, 04:18 PM   #1
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How long for inverter to drain battery?

How long would it take for a 1500W inverter to drain the batteries if you left it on?
Thank you!
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Old 08-13-2019, 04:22 PM   #2
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You have to read your specs on the inverter, depends on your solar and batteries and if there is anything plugged in or not.
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Old 08-13-2019, 04:27 PM   #3
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How long would it take for a 1500W inverter to drain the batteries if you left it on?
Thank you!
How much load is the inverter feeding ?
A cell phone or a large wattage electrical appliance ?
An inverter is not a substitute for shore power IMHO , it is only a short term temporary solution .
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Old 08-13-2019, 04:39 PM   #4
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This is just a hypothetical question because we don't have the 5.0TA yet (Dec 2019). How long wouldit take for the 1500W inverter to drain fully charged dual 6V batteries (225 amp) at night (so no solar) with nothing else drawing from it?.--(These are all from the Escape options.)
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Old 08-13-2019, 04:58 PM   #5
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Well, you can try it and report back, just do not go below 50%, then you may have permanent damage. Read this if you want to learn more about batteries parts 1 & 2 The 12volt Side of Life (Part 1)
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Old 08-13-2019, 05:08 PM   #6
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Quote:
Originally Posted by vivid blue View Post
This is just a hypothetical question because we don't have the 5.0TA yet (Dec 2019). How long wouldit take for the 1500W inverter to drain fully charged dual 6V batteries (225 amp) at night (so no solar) with nothing else drawing from it?.--(These are all from the Escape options.)
Don't have ready access to my trailer / manuals right now to look that up, I'm sure the inverter manual has specs on how much the inverter draws just by itself. But there would be no reason to leave it on all night with nothing running off it since it does use battery power just running by itself. Inverters are generally used for relatively short duration - briefly for running the microwave, which draws a lot, or longer for watching a 120 volt TV. I can't think of anything I'd want to have on all night - although I have heard of some folks who use a CPAP machine and those probably run on 120 volt AC.

If the inverter could run all night and not deplete your batteries, it would surely make a good dent in them and if you're boondocking you also will be using battery power for all the 12 volt stuff - fridge control board, furnace fan, water pump, lights, etc. On a sunny day with good exposure on your solar panel you can usually get charged back up, but there are many variables.
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Old 08-13-2019, 05:11 PM   #7
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leave the inverter OFF unless you absolutely need it, and switch it off again as soon as you're done.

typical inverter is going to draw maybe 1% of its rating even with no load at all. so a 1500 watt inverter, thats maybe 15 watts, which at 12V is like 1.2 amps. 1.2 amps for 24 hours would be 28 amp*hours, about 12% of yoru batteries total capacity (and 25% of the batteries useful 50% capacity).

(had to edit this, I slipped a decimal place in my first computation)
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Old 08-13-2019, 05:35 PM   #8
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btw, that 1% is why I use a little portable '200W' inverter, its static drain with no load is only a a couple watts... I use this for charging laptops, a few other things that are 120V only but don't need more than 100 or 150 watts.
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Old 08-13-2019, 06:26 PM   #9
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My inverter seems to draw a couple of amps as a parasitic load when it isn't powering anything. So-- drawing down your batteries to 50% would be 225 amp-hours / 2 = 112.5. 112.5 / 2 amps = 56.25 hours if you leave it on, not powering anything. YMMV, as they say.
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Old 08-13-2019, 06:55 PM   #10
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Quote:
Originally Posted by John in Santa Cruz View Post
btw, that 1% is why I use a little portable '200W' inverter, its static drain with no load is only a a couple watts... I use this for charging laptops, a few other things that are 120V only but don't need more than 100 or 150 watts.
I recently decided to do the same and bought a 300W inverter. It connects to the Escape through a 12v cigarette lighter connector, or auxiliary power cord. If I were to really draw 300W, that would be 25 amps, and that would exceed the safe current for a power connector. I was thinking about replacing the connector plug with Andersen PowerPole connectors which are good to 30 amps. Is this a good idea, or am I OK with the cigarette lighter plug? I just want to charge laptops, too.
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