12v charging, powering? - Page 2 - Fiberglass RV


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Old 08-23-2015, 03:34 PM   #15
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You have reversed understanding of inverter and converter. Converter converts 120V to 12V, Inverter converts 12V to 120V.

You need power INVERTER to run 120V items from battery. You don't need anything to run 12V items from battery. You need a converter to charge the battery from 120V.
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Old 08-23-2015, 03:42 PM   #16
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You have reversed understanding of inverter and converter. ....
Or perhaps just have the terms confused.. the links I referenced give very good explanations and uses the proper terminology.
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Old 08-23-2015, 03:56 PM   #17
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I would go with the 12 volt cigarette style plugs on a wall plate. Why is really simple I can run whatever I need or want to from that. All the devices have 12 volt auto charging solutions OR a small inverter will plug in and allow me to use the 110 volt charging solutions I use in the house.


No need to worry about if this installed set of USB power center does what I need with this or that device, or next years device. Lot of 12 volt devices assume cigarette style plug it is the standard for 12 volt hookup. Built in specific hookups to me makes more sense when installing something that does not change and/or require replacement. $20 USB charging panel does not strike me as a device intended to last for years.
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Old 08-23-2015, 05:12 PM   #18
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Quote:
Originally Posted by sokhapkin View Post
You have reversed understanding of inverter and converter. Converter converts 120V to 12V, Inverter converts 12V to 120V.

You need power INVERTER to run 120V items from battery. You don't need anything to run 12V items from battery. You need a converter to charge the battery from 120V.
While trying to be succinct, I think I've left out information that would explain the questions.

1. Do I need an inverter to charge phone and computer from battery? ...in other words, if I install a 12v charging center, is it drawing directly from the battery, or does it need an inverter to convert power to AC. I ask this because my phone and computer normally plug into a AC power source in the house so does the charging center need an inverter to make it compatible with what the computer expects. I realize that plugging into the cigarette lighter, for instance gives USB items access to 12v power source. What I don't know (and if I did know I wouldn't need to ask this question) is whether there is an inverter behind the cigarette lighter.

2. Do I need an inverter to power 12 volt items? Again, not sure if these 12v items, like a fan which could plug into the cigarette lighter, are finding a power source with an inverter behind it.

If the answer to this question is that I don't need an inverter to run 12v, then it must also mean I don't need an inverter for question #1.

3. If my solar charger is adequate, would my only need for a CONverter be to run 120V items?

Right, I do see this is backwards, which was unintentional. I should have asked, "would my only need for a converter be to charge the battery from shore power." Which is why you see the reference to the solar panel, if it's adequate, maybe I don't need a converter either, at least not now.
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Old 08-23-2015, 05:20 PM   #19
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1. You need power inverter to power 120V items like the computer.
2. No, you don't need anything extra to power 12V items.
3. You'll need a power INVERTER (not converter) to run 120v items from battery/solar charger.
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Old 08-23-2015, 05:27 PM   #20
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1. You need power inverter to power 120V items like the computer.
And just to complicate things.. you can get a power supply for laptop computers that runs off 12 VDC and has a cigarette plug. Its more efficient than using an inverter to go from 12 volts DC to 120 AC, then back down to 18 volts or whatever your laptop uses.
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Old 08-23-2015, 05:27 PM   #21
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In short, trailer's power is 12V (battery and/or solar). 12v items don't need any additional equipment. 120v items need an inverter. If you need an ability to charge the battery and/or power up 12v items from 120v, then you need a converter.
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Old 08-23-2015, 05:30 PM   #22
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Quote:
Originally Posted by sokhapkin View Post
1. You need power inverter to power 120V items like the computer.
2. No, you don't need anything extra to power 12V items.
3. You'll need a power INVERTER (not converter) to run 120v items from battery/solar charger.
THANKS. It helps to know that just ordering the charging center is not giving me the complete package, and that for now, I don't need a converter unless I want to charge the battery from shore power.

Gordon2, the second link is especially helpful. I'm printing it out and adding it to my binder of research.
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Old 08-23-2015, 05:53 PM   #23
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Three questions:

1. Do I need an inverter to charge phone and computer from battery? NO
2. Do I need an inverter to power 12 volt items? NO
3. If my solar charger is adequate, would my only need for a CONverter be to run 120V items?
The 120 would run off shore power. The converter produces 12 volts to charge the battery and to run the 12 volt devices from shore power. It is powered from the 120 VAC.
Personally I doubt that the 35 watt solar panel will be enough to handle your loads with no converter for back up. Of course it depends on your loads and when you are using the power and how much sun you have per day and the orientation of the panel during the day.

If you have the trailer set up to charge the battery from the TV while traveling the battery should be in pretty good condition when you park.

If you have shore power the 120 volts will be available for charging / running our devices. The 12 volts could be used and if you are running on 12 volts and charging your devices while you use then a power supply that operates directly from 12 volts would be more efficient than using an inverter the produce 120 volts AC to plug into.

If you check the watt loading and check the time you will be using then then you can get an idea as to the sustainability of the solar system.

If you were extremely lucky and had 100% sun for 10 hours that would be 350 watts ( most likely less) to burn. 1 amp at 12 volts for an hour would be 12 watts. 10 hours of charging would be 120 watts etc.

There are several articles that describe how to audit your usage and requirements. On this I am no expert, but I plan to go solar after I have finished rebuilding my Scamp.
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Old 08-23-2015, 10:47 PM   #24
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If you have a car version of your charger that plugs into a cigarette lighter, or if the device comes with that then you need nothing else.


One of these 300 watt pure sine wave inverters should be able to run laptop, tv, DVD player etc. AND any USB power supply used to charge your devices.



http://www.amazon.com/300-watt-pure-...jq3wjcgcron9o6

For sensitive electronics you want the pure sine wave (clean) output, modified sine wave is cheaper but really not a good choice for sensitive electronics. Now if you want to run a blow dryer or percolator they can put out the juice at a low price but output is just not clean enough to be ideal for electronics.
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Old 08-24-2015, 06:54 AM   #25
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Roger is correct and quite possibly the easiest thing to do would be to install the 12 volt cigarette socket that you can plug your charger into and these could also be used in your car while traveling as well.
This way you can get the adapter you need for your devices and also easily change them if necessary.
I have been thinking through the same thing for my Scamp rebuild and I think tha tthis is what I will do.
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Old 08-24-2015, 09:42 AM   #26
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If my netbook is plugged into AC I almost exclusively charge my phone from the PC. A cable that came with the phone has what is called a "standard-A" plug on one end and a "micro-B' plug on the other end. It is the same cable that is used with the "wall wart" chargers and the automobile "cigarette lighter" chargers.

More than what most people want to know: https://en.wikipedia.org/wiki/USB
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Old 08-25-2015, 01:16 AM   #27
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This component seems pretty versatile.
http://www.amazon.com/Multi-Use-Vehi...=12v+charging+
If I installed one 12 volt socket in the RV, this would act as an extension cord and give multiple outlets.

I would normally think that something like this would offer reduced power, but it claims to provide "heavy-duty capacity - rare 15 amp capacity."

The reviews are pretty stellar as well.
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Old 08-25-2015, 06:59 AM   #28
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The front of the device states 120Watts Max All Devices, that's 10 amps.
So much for advertising copy (again).
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