Why only 110v? - Page 3 - 2014+ Jeep Cherokee Forums
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post #21 of 34 (permalink) Old 06-18-2016, 04:33 PM
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the stock inverter is in the console.

voltage isn't the issue, wattage is, you're limited to 150 watts. I was able to power a 32" LCD TV, and DVD player on mine without an issue. 150 watts is a good bit of power, as long as what you're using doesn't have a heating element in it.

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post #22 of 34 (permalink) Old 05-04-2017, 12:02 PM
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Originally Posted by Len1304 View Post
I've used mine to run an extension cord into the house then power a few LED light bulbs during a power outage. But now I have my high amperage connection in the back as long as the engine is running I can power just about anything except the fridge with a 2000w inverter.


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That is a great idea! In my area power goes out for 2-4h every few months, so that would be handy

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post #23 of 34 (permalink) Old 05-04-2017, 03:31 PM
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That is a great idea! In my area power goes out for 2-4h every few months, so that would be handy



Thanks,


After doing the math for the inverter setup I'd recommend a 1000w inverter for at idle. But if you can hold the rpms at 2000 or so 1500w should be manageable.


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post #24 of 34 (permalink) Old 05-04-2017, 04:52 PM
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What Len is eluding to is the alternators ability to keep up with the load...

Since the average car battery is about 45-50AH (amp-hours)the most you can pull off a charged battery over 24 hours is 2 amps (more current = less time). The inverter isn't 100% efficient so the usable draw is slightly less than it's actual load on the 12V system. I don't know this for a fact, but it is my understanding that Jeep used a 24 hour (engine off) load as a benchmark goal for the on-board inverter. Thus the 150Watt capacity.


Edit to add: There are some other things to consider when powering things through an inverter besides current capacity or wattage. Most higher draw things like heating elements will have an inrush current (I moment when it is first turned on where more current is needed). Many inverters (especially low end ones) do not handle these types of draws. If you have this type of load you may need a larger inverter to get it going.


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post #25 of 34 (permalink) Old 05-04-2017, 04:55 PM
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Originally Posted by SS_Syndicate View Post
What Len is eluding to is the alternators ability to keep up with the load...

Since the average car battery is about 45-50AH (amp-hours)the most you can pull off a charged battery over 24 hours is 2 amps (more current = less time). The inverter isn't 100% efficient so the usable draw is slightly less than it's actual load on the 12V system. I don't know this for a fact, but it is my understanding that Jeep used a 24 hour (engine off) load as a benchmark goal for the on-board inverter. Thus the 150Watt capacity.


Pm sent. Too dizzy today to try and type and think things out well while typing.


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post #26 of 34 (permalink) Old 05-04-2017, 05:50 PM
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My wife's heating pad worked great while on vacation plugged into the inverter. This was at highway speeds so that might make a difference.

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post #27 of 34 (permalink) Old 05-04-2017, 05:59 PM
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My wife's heating pad worked great while on vacation plugged into the inverter. This was at highway speeds so that might make a difference.
I remember another member asked about heating pads here on the forum a long while ago, and looking into them I found they were rated at approx. 75W (seat only), so not a problem for the 150W inverter. Even a full seat warming pad like this one : https://www.amazon.com/Zento-Deals-H...ar+heating+pad

...only requires 120W, so good to go. Yes it's a 12V pad but it gives us an idea of wattage needed.

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post #28 of 34 (permalink) Old 05-04-2017, 06:03 PM
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Quote:
Originally Posted by Mark_ View Post
I remember another member asked about heating pads here on the forum a long while ago, and looking into them I found they were rated at approx. 75W (seat only), so not a problem for the 150W inverter. Even a full seat warming pad like this one : https://www.amazon.com/Zento-Deals-H...ar+heating+pad

...only requires 120W, so good to go. Yes it's a 12V pad but it gives us an idea of wattage needed.
This was just your standard home heating pad, but good to know.

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post #29 of 34 (permalink) Old 05-04-2017, 06:14 PM
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Originally Posted by SS_Syndicate View Post
What Len is eluding to is the alternators ability to keep up with the load...

Since the average car battery is about 45-50AH (amp-hours)the most you can pull off a charged battery over 24 hours is 2 amps (more current = less time). The inverter isn't 100% efficient so the usable draw is slightly less than it's actual load on the 12V system. I don't know this for a fact, but it is my understanding that Jeep used a 24 hour (engine off) load as a benchmark goal for the on-board inverter. Thus the 150Watt capacity.


Edit to add: There are some other things to consider when powering things through an inverter besides current capacity or wattage. Most higher draw things like heating elements will have an inrush current (I moment when it is first turned on where more current is needed). Many inverters (especially low end ones) do not handle these types of draws. If you have this type of load you may need a larger inverter to get it going.
Electric heating elements do not have higher inrush current when turned on. Electric heating elements are constant resistance loads and basically remain consistent in amp draw. Electric motors have high inrush current.
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post #30 of 34 (permalink) Old 05-04-2017, 06:42 PM
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Electric heating elements do not have higher inrush current when turned on. Electric heating elements are constant resistance loads and basically remain consistent in amp draw. Electric motors have high inrush current.

Scope a space heater.... the heater (wire) is a short or near short until current starts to flow. That's the cause of inrush. I agree motors are a much higher inrush and that some heating elements can have a more constant cold/hot ohm rating (low inrush). But the point of my post was to caution the types of loads people use with an inverter, not argue on this.

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