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  #31  
Old 02-04-2020, 07:39 PM
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johnbright johnbright is offline
 
Join Date: Aug 2010
Location: Newport News, Va
Posts: 325
Default megawatt

I have a megawatt 30 A, $50 + $8 shipping.

When you check out it says 13.8 V max but it's actually adjustable up to 15.5 V.

http://www.megawattpowersupplies.com/
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John Bright, RV-6A 25088, N1921R reserved, at FWF
O-360, 8.5:1, vert sump, dual SDSEFI EM-5-F
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  #32  
Old 02-04-2020, 08:29 PM
Scott Hersha Scott Hersha is offline
 
Join Date: Jan 2005
Location: Cincinnati, OH
Posts: 1,558
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My power supply looks a lot like the Mega Watt one listed above, but I bought it on amazon for around $30. It’s a 12V, 40 amp power supply that is adjustable. I usually set the output voltage at about 13.8 -14V. You can either connect it to the downstream post of your master relay, which takes the master relay out of the picture and powers everything on your master bus as soon as it’s plugged into the wall outlet, or connect it to your battery and use your master switch to turn it on. When you do it this way, your master relay will be powered all the time it’s on (like when you’re flying) consuming a small amount of energy, but the battery, which is a large capacitor, smooths out the input from the power supply. I have a PC680, so it also charges the battery. This will charge my aux battery (12V sealed lead acid/8 amp) if the master switch is on. Aux bus is powered from the switched aux battery, isolated from the main bus by a dedicated one-way Schottky diode. This is a very handy way to power things up even after your IP is built. Updates, configuration, troubleshooting, mods, etc..
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RV6/2001 built/sold 2005
RV8 Fastback/2008 built/sold 2015
RV4/bought 2016/sold/2017
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RV4/bought 2019 Flying
Cincinnati, OH/KHAO
JAN2020

Last edited by Scott Hersha : 02-04-2020 at 08:32 PM.
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  #33  
Old 02-04-2020, 10:56 PM
N96TJ N96TJ is offline
 
Join Date: Sep 2011
Location: Costa Mesa, CA
Posts: 29
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Quote:
Originally Posted by johnbright View Post
I have a megawatt 30 A, $50 + $8 shipping.

When you check out it says 13.8 V max but it's actually adjustable up to 15.5 V.

http://www.megawattpowersupplies.com/
I will also vouch for the MegaWatt units. There are a bunch of this style of power supply on the market but they are not all the same. I can run entirely from the S-350-12 (30A) set to 14.2V with no radio noise. To my surprise there is also no noise with the battery switched out of the system.
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