[Boatanchors] Rack mounted equipment handles?

[Mike Bracey]

 Thanks Charles,
I like it. Please keep us updated as you finish it up.
73, Mike

    On Wednesday, March 16, 2022, 05:47:19 PM CDT, Charles <charlesmorris800 at centurytel.net> wrote:  
 
  
It's very simple brute-force design, just a really big transformer, heat-sinked (and fan-cooled) 200A bridge rectifier, and a 220,000 uF filter cap. Accessorized with an AC breaker, a DC breaker I'm waiting for in the mail, 50V and 150A GE "Big Look" meters, and 3/8" stud terminals for connections.
 
The transformer is this one: https://www.ebay.com/itm/163601824136 and there are still six left. Contact the seller if you want one, the shipping was actually half of what the ebay calculator said! It's 41 lbs before packing. But you can't beat 20 volts at 250 amps RMS (=150 amps DC with a bridge). Dual 120v primaries. I'm running it on 240 volts.
 
 
The devil is in the details - at this current level, milliohm resistances can't be ignored. I used 4 AWG cable throughout, except to the filter cap which is 8 ga. (to help the inrush limiting a bit). It really should be 4 ga. also, and I'll probably add a soft-start circuit at the same time. I might add another 220,000 uF but the ripple isn't too bad even as-is.
 
 
Here's a pic of the front so far, will post more later. (Waiting to final-mount the huge toroid transformer until I get the circuit breaker and pilot lamp in, since it's much easier to wire behind the front panel without it!)
 

 
 

 
 

 
 On 3/16/22 12:01, Mike Bracey wrote:
  
 
 Charles, 
  I'm interested in your p/s. Could you give us details of your design when you have a chance? 
  73, Mike KE5YTV
  
      On Wednesday, March 16, 2022, 10:34:24 AM CDT, Charles via Boatanchors <boatanchors at mailman.qth.net> wrote:  
  
   Having nearly completed my boatanchor power supply (24-28 volts 
  unregulated at 150 amps), I have some difficulty in moving it due to the 
  50+ lb. weight.
  
  The aluminum rack front panel is 1/4" thick, and I've added diagonal 
  struts to the chassis, so the panel can take the weight once installed 
  in my rack cabinet. But it would be much easier if I had a pair of 
  handles mounted to the front. I've done some searching on ebay and there 
  are plenty of equipment handles, but most are small diameter (hard on 
  the hands and wrists) and I'd also be concerned that the mounting screws 
  would break under the load unless the chassis were held vertically.
  
  Looking for recommendations for hefty handles that also look like they 
  belong there and not on a door ;) thanks.
  
  
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