The issue with oversizing it is (for the energy conscious) a linear
supply demands more, ALL the time (it's inefficient with energy).
In some places it matters because of the KwH costs. pennies turn into
dollars.
(Not here, I was used to the higher prices and after I moved here, I
just stopped caring because the costs were 1/3 or less. I've even been
known to <gasp> run the air conditioner here!)
Rick nhc
On 6/9/2019 12:26 PM, Bob McGraw K4TAX wrote:
I find Mark's point very important. Obtain and use a supply which is
more than adequate for the service or load. Thus a 25 amp supply
feeding a radio drawing 20+ amps will need lots of cooling. This is
not the way to do it. Get a 50 amp supply for a radio drawing 20+
amps and the fan(s) will likely never come on. Go the cheap way
and get the cheap results. Do it right and be happy. Don't be a
cheap ham and then complain about the product you purchased.
There is more to choosing a power supply than volts and amps. How
about duty cycle? And CCS rated supplies vs. ICAS rated supplies.
Humm.......
73
Bob, K4TAX
On 6/9/2019 2:12 PM, Mark Murray via Elecraft wrote:
Peter,
Check out the high amperage 13,8 volt power supplies offered by Samlex
America at the following link, and in particular their 100-amp -plus
(continuous) supplies where the fans do not activate for low draws.
You had
mentioned something about price not being so important. These ain't
cheap.
73 de Mark .w2or.
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