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Budward View Drop Down
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Joined: 21 Apr 2014
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Posts: 438 		Direct Link To This Post Topic: I made an expensive mistake
    Posted: 24 Jul 2014 at 6:14pm
Originally posted by CharlieM

Originally posted by Budward

Originally posted by CharlieM

  I don't think you'd have trouble with even a 30A fuse on the board.  


I agree- and I'd pick the fuse nearest to the convertor DC input block.  Minimize the amount of PC board foil to run through.   Looks like the 4th and 5th up from the bottom.


Both ways of paralleling the two fuses have the same problem The slightest difference in resistance between the two paths will prevent the fuses from sharing equally. This includes the wires, the circuit board paths and their solder joints, the fuse clips, and even the fuses themselves. Two 20A fuses will adequately protect the board traces, but they may or may not divide the 30A load evenly. So, for example, if slight resistance differences cause one fuse to carry 20A and the other to carry 10A the one carrying 20A will soon blow. Now the other must carry the entire 30A and will immediately blow. It gets worse with two 15A fuses.




I agree and did point out unequal sharing-  
but look what both PD and WFCO did in their battery protection fuses- 
they did the same thing- Paralleled fuses!  Tongue
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spacemonkey View Drop Down
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Joined: 04 Oct 2013
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Posts: 32 		Direct Link To This Post Posted: 24 Jul 2014 at 6:21pm
well, im going to try the 20amp fuse.  if that does not work, im going to return the unit and buy what i already had a know works.    I cant afford to burn out another unit and then have to turn around and buy another one again.

Using a 20amp fuse cant hurt anything right?  Worst case is I burn the fuse up?

On another note, looks like i will be getting another tv as well.   I tried jumping the fuse with a little piece of copper wire like we discussed earlier.   Plugged it in in and got a loud pop, and lots of smoke.....So yeah...its toast...lol
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CharlieM View Drop Down
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Posts: 1797 		Direct Link To This Post Posted: 24 Jul 2014 at 6:30pm
Originally posted by Budward




I agree and did point out unequal sharing- Yes you did and you were right

  
but look what both PD and WFCO did in their battery protection fuses- 
they did the same thing- Paralleled fuses!  Tongue Agreed and I don't like it here either.Wink And PD is cutting it close with two 30s and a 55A charger rating.
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Charlie
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