14 volt tv and the inverter squealing.

BFL13 wrote:
LY wrote:

:) Got to be a story there! Yes, use the multimeter to see if there is a minus sign before the voltage reading to tell if you are are reversed.

Well, I have not reverse polaritied TV's or laptops. My warning stems from on of the 'universal' adapters being able to easily reverse the polarity by flipping the barrell plug over on the receptacle, though some of them had different size pins so an accidental unhooking and quick return would not fry something.

I do use a laptop car adapter, for a 19.5v Dell, but these plugs have a third center pin inside the barrell, so a universal will not work properly, at least to both power the laptop and charge the battery.

What I have reversed the polarity on is cheap voltage buckers, the 5 for 11 dollar type, or PWM motor speed controllers.

That said if the OP really wanted to, they could buy a simple DC voltage booster/ step up converter and set it to 14 volts. In my experience the buckers hold a very steady voltage once set.


My Tv is rated for 18 watts yet rarley exceeds 12.

This DC to DC voltage booster is rated at 4 amps, should be more than enough for a 35 watt max TV, unless input voltage is falling much below 9vDC, which would mean very resistive undersized wiring/bad connections or bad battery or any combo of all three:

https://www.amazon.com/RioRand-Converter-Voltage-Adjustable-Circuit/dp/B071H39ZN5/ref=sr_1_4?ie=UTF8&qid=1550280343&sr=8-4&keywords=DC+voltage+booster

I have added heatsinks to the processor chips of my buckers when expecting to approach their amp rating, these are peel and stick:

https://www.amazon.com/dp/B07H16X2Q2/ref=sspa_dk_detail_0?psc=1&pd_rd_i=B07H16X2Q2

This approach is Likely a lot more efficient than the double conversion with an AC/DC brick on an inverter too. The Wagan elite 400psw inverter fan did not become audible until the 150 watt range in my experience, but inverters can be noisy enough to knock out antenna tv channels. I do not notice any noise on my buckers, but my laptop dc to dc, as well as my AC to DC converter knock out actual channel 8 and 10, which are quite strong in my local.