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Old 10-08-2020, 09:19 AM   #1
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Will this inverter set up work?

If an inverter is connected to a tow vehicle's battery(while idling) , can it power a travel trailer that is plugged into the AC receptacle of a 1000 W pure sine inverter? I would be using a 15 amp adaptor that would plug into the inverter's AC receptacle.
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Old 10-08-2020, 10:41 AM   #2
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1000W would power a little. It could recharge the camper battery and power the refrigerator and fans. It cannot power the A/C, electric hot water heater or microwave.
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Old 10-08-2020, 04:22 PM   #3
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1000W would power a little. It could recharge the camper battery and power the refrigerator and fans. It cannot power the A/C, electric hot water heater or microwave.
Glad to hear that. That's all what I really need. I would use that scenario, as a backup, if my solar panel couldn't keep my battery bank charged.
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Old 10-15-2020, 07:21 PM   #4
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My truck feeds the trailer 12VDC+ pin with a 30 amp fusible link. IF you could somehow miraculously get the long wire, pin connection and trailer to support a full 30 amp flow, even that, at 12VDC comes to 360 Watts. That's all there is. A PERFECT inverter (only theoretical) would produce 3 Amps at 120VAC. On any power transfer transformer, converter, inverter, et al, power out is always less than power in. You will never get 1000 Watts, even if the converter is large enough to handle that load, out of a trailer 7-pin connecton.
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Old 10-15-2020, 08:12 PM   #5
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Not sure why you’d use that Rube Goldberg setup to charge the battery. Your inverter will convert the tow vehicle’s 14.4 VDC into 120 VAC, then the trailer’s power converter changes it back to the same 14.4 VDC to charge the battery. If the tow vehicle is nearby & running anyway, why not just plug in the 7-pin connector? That’s what charges the battery when you’re on the road.
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Old 10-16-2020, 08:08 AM   #6
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What Marty said. I don't know how much current the alternator would produce at idle, but it won't be much.
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Old 10-17-2020, 10:16 AM   #7
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Not sure why youíd use that Rube Goldberg setup to charge the battery. Your inverter will convert the tow vehicleís 14.4 VDC into 120 VAC, then the trailerís power converter changes it back to the same 14.4 VDC to charge the battery. If the tow vehicle is nearby & running anyway, why not just plug in the 7-pin connector? Thatís what charges the battery when youíre on the road.
If I use just the 7-pin connector, wouldn't it take longer to charge my trailer's battery? And I couldn't use the electric outlets for AC appliances?
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Old 10-17-2020, 02:27 PM   #8
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Old 10-17-2020, 05:45 PM   #9
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If I use just the 7-pin connector, wouldn't it take longer to charge my trailer's battery? And I couldn't use the electric outlets for AC appliances?
Any AC appliances you run will reduce the power available for charging. The inverter doesnít create power out of thin air, it just converts it from DC to AC. The source of power the tow vehicle alternator, same as the 7-pin connector.

At full load, your 10000W inverter will draw 75-85 amps DC from the tow vehicle. Yes, thatís a lot more than the 30 amps available from the connector, but the connector goes straight to the battery, eliminating the energy loss through both the inverter and the trailer power converter.

In addition, the total AC output of your 1000W inverter is 8.3 amps, about half the capacity of a standard 15 amp AC outlet. While you could conceivably run a small microwave or an LED TV, most of your AC appliances are too big to power from the inverter. A typical water heater takes 6 amps, a refrigerator on electric is around 8, and a 13000 BTU air conditioner takes about 16 amps, twice what the inverter can provide. And whatever AC you use takes away from charging the battery.
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Old 10-19-2020, 09:14 AM   #10
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The charging ability of the average TV to a trailer is minimal at best.

12 volt line losses are substantial. My 200 amp alternator only sends about 2-3 amps to the Fifth wheel! A residential fridge might need over 10.

For the most part the TV might not outpace the parasitic loads. Much less a refrigerator. Unless your TV was modified. Motorhomes are the exception.

To recharge the battery in the RV the fastest use the converter and shore power. Second choice is an inverter generator attached to shore power.
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