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Old 01-06-2012, 04:21 PM   #1
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12v Electrical mods planned

I'm planning to make the following mod to my 2012 RG3210 5er in the coming weekends. I wanted to get some feedback from some folks that have done similar stuff

Changing out my single 12v battery that came with the rig to two 6v golf cart batts. going to source the batts to get around 200-230 AH.

Looked into changing my on-board charger, but on further research found that it is already a 3 stage charger, so I'm gonna leave it. I have the WF-8935 35 Amp Power Center. info here:
Power CentersWF-8935ANP, WF-8935 35 Amp Power Center#

I am going to install a 12v outlet at or near my 32" Sansui tv so I can power it with a 400w portable inverter. Planning to use #10 wire to the 12v outlet. The tv specs claim approx 65 watts on, so with a 12v system I'm figuring about 7 amps draw, plus any voltage drop.

going to splice in a two circuit three position switch (backwards)Bryant Electric White Single Pole Three Position Two Circuit Switch
to the 120v circuit at the 120v outlet by the tv so I can feed that outlet with the invertor OR the shore power/genny

Lastly, I would liek to install a meter somewhere on the 12v side with a momentary switch so that I might be able to see what I'm drawing from the batts at any given time, but I havent researched that yet. Not sure what would be required and how to rig it. Any advice/recommendations would be appreciated

Any thoughts?
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Old 01-06-2012, 04:32 PM   #2
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Most 400w inverters are modified sine wave (MSW), as opposed to a Pure Sine Wave (PSW) unit. I'm no expert on the difference, but my reading told me that you are taking a chance running almost anything electronic on MSW. This is why I spent the extra $$$ on PSW. Not saying that it won't work, just saying that there is exttra care needed as to what you can or can't plug into MSW.
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Old 01-06-2012, 04:55 PM   #3
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Thanks for the input. Actually, I had planned to look for a pure sine wave inverter in the 400 watt range. I should have specified that. I found a nice little 300 watt one here

Shop Power Bright 300 Watt 12V DC to AC Pure Sine Inverter at Lowes.com

and may go with it if I dont find a decent one at 400 watt
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Old 01-06-2012, 07:02 PM   #4
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I'm confused, you mention installing a plug for 12 volts. Are you planning on plugging in the DC side of the portable inverter into that plug and hardwiring the AC side thru the listed switch to the existing wall receptacle? Why not just plug the tv into the inverter directly, and then plug into the existing wall recptacle when on shore/genny power? No switch needed. I'm not entirely sure how the switch listed could be installed to function in the manner stated as it only has one pole. Am I missing something?
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Old 01-06-2012, 09:26 PM   #5
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Watch out running any electronics on genny with out a good surge protector. Gennys are unstable.
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Old 01-06-2012, 09:41 PM   #6
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I'd be leary of this unit - not UL listed?
Seemed too good to be true for the $$.




Quote:
Originally Posted by crashbot View Post
Thanks for the input. Actually, I had planned to look for a pure sine wave inverter in the 400 watt range. I should have specified that. I found a nice little 300 watt one here

Shop Power Bright 300 Watt 12V DC to AC Pure Sine Inverter at Lowes.com

and may go with it if I dont find a decent one at 400 watt
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Old 01-06-2012, 09:53 PM   #7
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Quote:
Originally Posted by Fire Instructor View Post
Most 400w inverters are modified sine wave (MSW), as opposed to a Pure Sine Wave (PSW) unit. I'm no expert on the difference, but my reading told me that you are taking a chance running almost anything electronic on MSW. This is why I spent the extra $$$ on PSW. Not saying that it won't work, just saying that there is exttra care needed as to what you can or can't plug into MSW.
Whether it works or not probably depends on the type of Power Supply
used by the device.

At various times, I have run two notebook computers, a wireless
router and/or a small TV on a 400(800 surge) inverter. The notebooks
and router all had "wall wart" type switching regulator power supplies.
Don't know about the TV. Switching regulators rectify the AC to high
voltage DC and use that to create a high frequency AC that is then
converted to regulated DC. Since the incoming AC is first rectified to
DC, it's waveform is probably not terribly critical.

Most "modern" electronics will have a switching type supply to
reduce size, weight and cost, so I don't worry too much.

I worry much more about voltage spikes, current surges, and
"trash" on the power from tow vehicle or genset!!!........
YMMV.

cheers,
johnd
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Old 01-06-2012, 10:03 PM   #8
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It has been known for years that MSW inverters and wall warts do not make good bedfellowes...
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Old 01-06-2012, 11:13 PM   #9
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Quote:
Originally Posted by Saratoga Camper View Post
It has been known for years that MSW inverters and wall warts do not make good bedfellowes...
Could you explain to a retired EE why that might be true?
[I was not posting about wall warts with TRANSFORMERS, but
specified those with switching supplies. Big diff........]

cheers,
johnd
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Old 01-07-2012, 12:13 AM   #10
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Quote:
Originally Posted by shooted View Post
I'm confused, you mention installing a plug for 12 volts. Are you planning on plugging in the DC side of the portable inverter into that plug and hardwiring the AC side thru the listed switch to the existing wall receptacle? Why not just plug the tv into the inverter directly, and then plug into the existing wall recptacle when on shore/genny power? No switch needed. I'm not entirely sure how the switch listed could be installed to function in the manner stated as it only has one pole. Am I missing something?
Yeah, it's due to install conditions. I was trying not to get to lengthy, but here is the reasoning...

yes, I plan to plug the inverter into the 12v outlet...

The 32" tv to be powered at this location is a wall mount unit built in to a cabinet over the main entry door to my trailer. The power cord and outlet powering it are not easy to get to. You have to remove the moulding around the tv and squeeze a hand in.. Not practical for regular switching of power sources. ..

The switch I mentioned will be installed int the bottom of the enclosure, behind the tv, so it will be overhead at the doorway.

I actually should verify the link I gave for the switch is the exact switch I was told to use. I think it is, but Im not sure, but I will be before I buy it..

The switch should work as described according to a friend of mine who does electrical design work. It is intended to take a single line in of 120v and switch it between one each of two different circuits out ( or none if set to center). I will be using it backwards, with two sources of 120v (shore or inverter)feeding into the switch and one line coming out powering a new outlet mounted in the tv enclosure. According to the electricians I have spoken with, the switch doesnt know which way the electricity is flowing so it should work fine. My only concern was What if I accidentaly turned on the inverter while I also had shore power, but all I spoke with assured me the switch only activates one circuit or the other (or none at center) but never both.


So the sitch would be wired as follows.. The 2 circuits out(IN for My usage) would each be wired with a 1 to 2 foot long cord with a regular three prong plug at the end. One of the plugs will be plugged into the existing 120v outlet that currently feeds the tv. The other will be poked through the gap at the side of the tv so I can pull the cord out and connect to the inverter when in use. The circuit in on the switch (OUT for my usage) will be wired to a NEW electrical outlet behind the tv. This new outlet is what the tv cord will be permanantly plugged into.

This set ip should allow me to run the tv normally(with switch set to shore power) or throw the switch to inverter, extend the cord on the side of the tv and plug it into the converter which will be plugged into the 12v outlet

with all that said, i want to keep the inverter out of the tv enlosure because of heat concerns, and I want it plugged into a 12v outlet because I wont be permanantly mounting it on my wall. For one it doesnt match the decor, and I may have other uses for it .. I have a 19" LCD in the bedroom I may want to power up from time to time. Plus, My wife wouldnt approve.
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