rbertalotto Posted March 15, 2018 Report Share Posted March 15, 2018 I have an Insignia tv in my trailer. It uses a 12v “wall wart” adapter. I have it connected to my 12v system directly. Not using the power adapter. when my solar system is fully charging the batteries I can see as high as 13.8 volts on the feed to this TV. At that point the TV must have an over voltage circuit as the picture goes black but audio remains. as an experiment I used the power adapter the TV came with powered by my inverter. This power supply outputs exactly 12 volts as tested with a digital VOM when powered by my inverter. No issues, TV works fine in this configuration. when supply voltage is down at 11.5 -12v, the TV is fine. how can I build (or purchase) some type of voltage regulator to maintain voltage at no more than 12v? thanks RoyB South of Boston 2021 Dodge 2500 - 6.4L Forest River 19RR Toy Hauler Roofnest Falcon Rooftop Tent www.rvbprecision.com Link to comment Share on other sites More sharing options...
Devilishjim Posted March 15, 2018 Report Share Posted March 15, 2018 hook your 13.8 volts to power outlet and plug your 12 volt power cord into it Jim Spence 2000 Dodge 3500 1 ton QC 4x4 dually 5.9 diesel LB BD exhaust brake, 6 spd manual trans 34CKTS Cedar Creek 5er, Trail-Air hitch Link to comment Share on other sites More sharing options...
jcussen Posted March 16, 2018 Report Share Posted March 16, 2018 Buy a cheap 150 watt inverter and plug into 12 volt supply, and then use your tv "wall wart". Not the most efficient way, but it will protect your tv. Foretravel 40ft tag 500hp Cummins ISM 1455 watts on the roof, 600 a/h's lithium in the basement. Link to comment Share on other sites More sharing options...
TheLongWayHome Posted March 16, 2018 Report Share Posted March 16, 2018 DC to DC 12VDC Regulated output. Need to determine your current draw or overall wattage need of your TV+ margin. Here is a sample but they have many different wattages. https://www.powerstream.com/dc12-12-8A-isolated.htm Link to comment Share on other sites More sharing options...
Yarome Posted March 16, 2018 Report Share Posted March 16, 2018 5 hours ago, TheLongWayHome said: https://www.powerstream.com/dc12-12-8A-isolated.htm Yikes!! For a single device just go on eBay or Aliexpress and look for a 12v 2a (or whatever amp output you need. 1a-5a is common) "buck" converter/regulator. $5-$10 will get you a prewired little box that's easily mountable (and weatherproofable). If you want to go "component", wire and "house" your own... more like $.50-$1.50 for a board module. Nice little one there. 9-22v input to 12v 2a regulated output. $8 Adjustable models are available too. Those type will set you back $20 though. Link to comment Share on other sites More sharing options...
rbertalotto Posted March 16, 2018 Author Report Share Posted March 16, 2018 Thanks....ordered 12v / 5A regulator off Amazon. Should solve the problem. It’s strange that a smaller version of the same TV in the bedroom has no issues. RoyB South of Boston 2021 Dodge 2500 - 6.4L Forest River 19RR Toy Hauler Roofnest Falcon Rooftop Tent www.rvbprecision.com Link to comment Share on other sites More sharing options...
Yarome Posted March 16, 2018 Report Share Posted March 16, 2018 7 minutes ago, rbertalotto said: It’s strange that a smaller version of the same TV in the bedroom has no issues. If it's futher away from your source you might be getting enough line loss that's keeping the juice flow "in-range", it may simply have a higher tolerance, or "smaller" might also have less internal regulation/protections and it's running that one "hot". Link to comment Share on other sites More sharing options...
Tom_M Posted March 17, 2018 Report Share Posted March 17, 2018 There are basically three types of DC-to-DC convertors, buck, boost, and buck/boost. Most buck and boost converters need a 2 volt offset. This means that for a boost converter, to get 12 volts out you would need 10 volts or less in. For a buck converter you would need at least 14 volts in. What is needed is a buck/boost converter. My laptop needs 19 volts so I was able to use a cheap boost converter that I purchased on eBay for $2.50. Here's a typical one available on Amazon: Drok Buck/Boost converter Tom—————————————————2005 Born Free 24' Rear Bath Towing 1978 VW Bug convertible Minneapolis, MN Link to comment Share on other sites More sharing options...
rbertalotto Posted March 26, 2018 Author Report Share Posted March 26, 2018 I bought this device from AMAZON and just wired it in. Works great! You can easily regulate the output voltage and regulate the accuracy of the display. Like most devices from China...no instructions except for what is written on the unit. But pretty easy to understand. No matter the input voltage, my TV is now seeing 12V constantly. https://www.amazon.com/gp/product/B01DXEU4KA/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1 RoyB South of Boston 2021 Dodge 2500 - 6.4L Forest River 19RR Toy Hauler Roofnest Falcon Rooftop Tent www.rvbprecision.com Link to comment Share on other sites More sharing options...
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