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Old 01-26-2015, 12:14 PM   #1
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Another Electrical Question

I plan to get 2 or 3 AGM batteries so I have the option of boondocking for a few days at a time. I don't intend to boondock for extended periods of time. Maybe 5 days or so at a time separated by weeks in several different developed campgrounds with electrical service. I just want the option to do it if I want to. I also don't want to buy a generator and have to deal with a gas can therefore the reason to charge the batteries in electric supplied campgrounds. If I fall in love with boondocking, then I'll get into it with generator and/or solar etc...but for now, I don't think so.

A quick check on the power I will need from the battery set will be water pump, a few lights, landing gear, stabilizing jacks, cell phone charger, jet pack charger and laptop charger.

Question:
There is a tag on the cord for my laptop charger that says, "125 V, 7 amp". If watts = V * A, does this mean I need a 875 watts inverter just to charge my laptop? I would just as soon not have to get an inverter unless I have too. The rest of the stuff seems to be able to run directly from DC current.

Thanks in advance.
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Old 01-26-2015, 12:29 PM   #2
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You don't say what laptop, but I think you misread the charger. It is probably more like 1.7A You also forgot to count the CO/Propane sensor in your current demands.
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Old 01-26-2015, 12:37 PM   #3
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I just looked at the charger for my newer lenovo laptop and it is 90W.
You can get laptop chargers that work off 12v you may want to look into this.
One other draw on the battery will be the fridge.
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Old 01-26-2015, 12:49 PM   #4
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Also about 1 amp from the frig circuit board.

You might consider a small solar panel -
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Old 01-26-2015, 03:03 PM   #5
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Probably it is 7 amps on the 12 volt (approximately) side of charger which would be about 84 watts.
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Old 01-26-2015, 07:36 PM   #6
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A few years ago, I ran a notebook PC with a 140 W inverter with complete success. I still use that inverter to charge cell phones and other similar devices but I haven't tried a newer notebook PC on it. Your notebook's power cord likely says 1.7 amps and that would be the charging transformer's maximum power rating. Your notebook will run much less than this ~200 W maximum transformer rating.
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