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Old 08-21-2014, 05:19 PM   #1
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Power drop when ignition is turned on

Does anyone know why when I have my DVD player on with tv on same plug running off inverter when I turn the ignition on the DVD player turns off tv stays on and can't get it to come back on while the Ignition is on I checked power at plug and all is good don't know if I am getting feedback I notice the battery levels drop down also
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Old 08-21-2014, 05:49 PM   #2
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Quote:
Originally Posted by Matt151 View Post
Does anyone know why when I have my DVD player on with tv on same plug running off inverter when I turn the ignition on the DVD player turns off tv stays on and can't get it to come back on while the Ignition is on I checked power at plug and all is good don't know if I am getting feedback I notice the battery levels drop down also
The DVD may be plugged into the interlock outlet. Most rigs have an interlock device that keeps the front TV from operating while the ignition is on. It can be bypassed and someone may have done that with the TV. Just a guess.
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Old 08-21-2014, 07:27 PM   #3
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Up by the tv there is a brown outlet and a white outlet the tv stays on DVD turns off and they are in the same plug I switched them around same thing
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Old 08-21-2014, 08:12 PM   #4
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Down to what voltage? And, does it come back up to 13.4 v or more?


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Old 08-21-2014, 08:16 PM   #5
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It's the 120volt outlet with the inverter powering it I only lose .5 volts can't get the DVD player to come back on until I turn the ignition off if I have the gen powering it,it works fine just can't do it with the ignition on with inverter
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Old 08-22-2014, 07:12 AM   #6
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WAG here, but could the inverter be a square sine wave model?
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Old 08-22-2014, 08:26 PM   #7
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Is a square sine wave the same as a modified sine wave ??
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Old 08-22-2014, 08:56 PM   #8
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Is a square sine wave the same as a modified sine wave ??
No...., actually no such thing as a square sine wave.. there are sine waves, square waves and modified sine waves




A lot of TVs, DVRs and other electronics use what is called a switching power supply to provide the necessary voltages to the device. Older electronics and a small amount of current electronics use a normal power supply that has a transformer. Some switching power supplies do not like being fed one type of voltage then another. Also, most TVs do not use a "hard" power switch. i.e. when you press the power switch it activates a chip that turns on the TV (momentary switch), where as a hard power switch actually connects wires together and they stay connected until you push the switch again, just like a light switch in a stick house. If the device has a momentary switch then it does not stay "in" as it only connects the chip to power it up. With a momentary switcch power goes off as soon as power at the plug is lost... and you have to push the switch again.

Our TV "hangs up" when switching from inverter/shore power/generator power and I have to remove the power plug and plug it back in to get the TV to work. When I installed the TV I mounted it to a 3/4" piece of plywood with a piano hinge at the top so it is very simple to open the catch and unplug/plug in the power. Next TV I will test BEFORE I install it :-)
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Old 08-22-2014, 11:30 PM   #9
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Thanks for the understanding I will try a different DVD player
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Old 08-23-2014, 11:36 AM   #10
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IF the TV is up front where the driver can see it then by Federal Law there is an interlock, normally in the outlet box, between the ignition system and the TV, this disables the TV when the Ignition is on.. if you plugged the DVD into the same outlet.. it will disable that as well.

LOOK at the outlet box.. You may see a 12 volt wire going to the box, this is the interlock wire.. Cutting it will keep TV on.. HOWEVER if you get caught.. there will be a fine to pay.

Thus I can not recommend it

Also, if there is an alternative outlet.. USE IT (I would rather you NOT cut the wire)
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Old 08-23-2014, 12:05 PM   #11
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No...., actually no such thing as a square sine wave.. there are sine waves, square waves and modified sine waves
texnet
Now that is confusing!
BTW, which of those 3 waves does a PSW, ("Pure Sine Wave") inverter produce?
Why do some think that the more expensive PSW inverters are necessary?
(MSW inverters have never been a problem for me).
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Old 09-02-2014, 10:39 PM   #12
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I still have power at the outlet when the key is on and it works off the inverter when the keys is off so I know that it works off the inverter just won't work when the keys is on
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Old 09-02-2014, 11:03 PM   #13
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texnet
Now that is confusing!
BTW, which of those 3 waves does a PSW, ("Pure Sine Wave") inverter produce?
Why do some think that the more expensive PSW inverters are necessary?
(MSW inverters have never been a problem for me).
Mel
'96 Safari
The red line is the pure sine wave, just like you get out of the wall connected to the national power grid.
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Old 09-03-2014, 01:12 AM   #14
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Originally Posted by mel s View Post
texnet
Now that is confusing!
BTW, which of those 3 waves does a PSW, ("Pure Sine Wave") inverter produce?
Why do some think that the more expensive PSW inverters are necessary?
(MSW inverters have never been a problem for me).
Mel
'96 Safari
There seems to be some evidence that purely resistive loads such as electric blankets, hair dryers and that kind of thing does not like MSW. Most televisions and anything that runs off of batteries such as laptops could care less. The problem is the high frequency sides of the MSW. A sine wave is a curve which is the same frequency all the way through. The MSW and the Square Wave go from basically one wave form to a 180 degree waveform virtually instantly which is in reality extremely high frequency. Some things do not like chaning polarity that fast.
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