newbie inverter question - Event Date: 15 Nov 2015 |
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techntrek
Admin Group - pHp Joined: 29 Jul 2009 Location: MD Online Status: Offline Posts: 9062 |
Calendar Event: newbie inverter question Posted: 23 Nov 2015 at 10:15pm |
Some of the extra loss when using AC is from inefficiency in the AC-to-DC power supply. But I find it hard to see it only using 36 watts on DC but then 216 watts through the power supply. Even at 80% efficiency in the power supply it would be around 45 watts on AC, or less than 0.4 amps from the socket.
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Doug ~ '10 171 (2009-2015) ~ 2008 Salem ~ Pod instruction manual
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Rockin the Pod
Groupie Joined: 18 Oct 2015 Location: Southeast Utah Online Status: Offline Posts: 51 |
Posted: 23 Nov 2015 at 11:17pm |
Thanks again to everyone that offered replies and explanations! I have learned a lot from this discussion and appreciate the expertise in this forum. I feel like I can make an informed decision on what will be right for my situation.
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2016 180 HRE
2014 Tacoma Taylor 210 CSE Bose L1 Model II 2008 Harley Davidson Electra Glide Classic |
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CharlieM
Senior Member Joined: 23 Nov 2012 Location: N. Colorado Online Status: Offline Posts: 1797 |
Posted: 24 Nov 2015 at 9:12am |
I had the same reaction when I read the post. 180 watts of wasted power would show up as lots of heat somewhere. AC current measurements are tricky with unknown waveforms. Peak vs "average" vs RMS. I suspect the AC current measurement is in error due to a high peak to average ratio of the charging current in the AC to DC conversion. The real answer is a true RMS current meter or a real watt meter, both expensive. |
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Charlie
Northern Colorado OLD: 2013 RP-172, 2010 Honda Pilot 3.5L 4WD PRESENT: 2014 Camplite 21RBS, 2013 Supercharged Tacoma 4L V6 4WD |
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techntrek
Admin Group - pHp Joined: 29 Jul 2009 Location: MD Online Status: Offline Posts: 9062 |
Posted: 24 Nov 2015 at 3:51pm |
+1
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Doug ~ '10 171 (2009-2015) ~ 2008 Salem ~ Pod instruction manual
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Podinaroundbc
Newbie Joined: 26 Jul 2015 Location: Alberta Online Status: Offline Posts: 34 |
Posted: 24 Nov 2015 at 7:21pm |
We bought a 350 watt pure sine for our 179. I'm still trying to figure out where to mount it. Does anyone have any ideas?
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Art & Brenda
Jake the dog 2015 179 HRE 2012 Nissan Titan |
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JandL
Senior Member Joined: 29 Mar 2014 Location: California Online Status: Offline Posts: 364 |
Posted: 24 Nov 2015 at 9:33pm |
My original reason to post was “Rockin the Pod” asked should he replace his TV with a 12 volt one or buy and inverter. My choice is to buy a TV that will run on 12 volt DC because of the requirement to run a inverter you need 11 amps of DC to make 1 amp of AC. I went out and measured the current to run my TV to get the actual numbers. On the back of the TV it says Power Supply 12V, 3A, 24W and on the AC Adapter it has input 100-240 VAC 50/60 hz, 1.8 A, Output 12 VDC-3 amps. So at 24 watts that is 2 amps of DC to run the TV. The actual measurements, using a current clamp, was with the TV on battery power it drew .72 amps, with a DVD playing it drew .98 amps (.98A x 12.7V = 12.5 watts). (Turns out to be much lower than the manufacture says). The measurements with the 120 AC adapter with the TV running the current measurement was .11 amps and with a DVD playing .15 amps (.15A x 120V = 18 W). The difference in wattage between the DC and AC I think is because the AC Adapter is a small inverter. So if I wanted to play a DVD and run the TV thru an inverter it would draw from the battery .15 amps x 11 = 1.65 amps. If I ran it with just the battery it’s only drawing 1 amp.
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JandL
2013 Honda Ridgeline 2012 177 2 Paynes in a Pod |
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Rockin the Pod
Groupie Joined: 18 Oct 2015 Location: Southeast Utah Online Status: Offline Posts: 51 |
Posted: 24 Nov 2015 at 11:09pm |
Thanks JandL. In my situation where most of my camping is dry, I have pretty much decided to go the 12 V tv route. It makes more sense to me at this point. Like I said in a previous post, I appreciate all of the input from everyone. I have learned a lot! If I only have to run my generator half the time, that will save a bunch on gas since I have an older 3600 rpm generator but it is pretty quiet. It is kind of a gas hog compared to the new inverter types but it is paid for and still runs like a top.
I am glad I asked the question and hopefully a lot of people got a lot of good info from looking at this thread. You all rock! Thanks!
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2016 180 HRE
2014 Tacoma Taylor 210 CSE Bose L1 Model II 2008 Harley Davidson Electra Glide Classic |
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Rockin the Pod
Groupie Joined: 18 Oct 2015 Location: Southeast Utah Online Status: Offline Posts: 51 |
Posted: 24 Nov 2015 at 11:19pm |
The one thing that I find kind of interesting is that my combo radio/dvd/cd player and my HD antenna amplifier all run on 12 volts. Wonder why they put a 120 Volt tv in. Scratching my head a little bit on that one.
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2016 180 HRE
2014 Tacoma Taylor 210 CSE Bose L1 Model II 2008 Harley Davidson Electra Glide Classic |
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JandL
Senior Member Joined: 29 Mar 2014 Location: California Online Status: Offline Posts: 364 |
Posted: 25 Nov 2015 at 12:33am |
We brought our trailer used but it did originally come with a Jensen JE1909RTL 19" LCD TV that ran on 12V or 120V. The people we brought it from removed the whole Jensen system because they had nothing but problems with it, and installed the Naxa brand TV
I though all the TV’s installed were 12 volts but I looked at this older post and they are not. Podmods, Maintenance, Tips and Tricks, Posted: 02 May 2014, 179 owners- Jensen TV NOT 12v?? |
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JandL
2013 Honda Ridgeline 2012 177 2 Paynes in a Pod |
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CharlieM
Senior Member Joined: 23 Nov 2012 Location: N. Colorado Online Status: Offline Posts: 1797 |
Posted: 25 Nov 2015 at 9:54am |
I was with you until the last sentence. I'm not sure where the number 11 came from. The 18 watts seems reasonabe at 120V. Producing that from 12V with an 80% efficient inverter would take 18/0.8/12 = 1.875A That said, the 12V TV is still the best option. |
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Charlie
Northern Colorado OLD: 2013 RP-172, 2010 Honda Pilot 3.5L 4WD PRESENT: 2014 Camplite 21RBS, 2013 Supercharged Tacoma 4L V6 4WD |
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