[ARC5] 24vdc power

[millerke6f at aol.com]

Look to computer recycle places for discarded UPS units.  The batteries are usually junk, but the magnetics in even the smaller units are quite hefty.  I've been using them for some time in projects and core calculations on some of the medium units are well over 1KVA and voltages are within reason for a lot of power supplies.  I use those 100 amp bridge rectifiers found on Ebay for the heavy duty loads and they can be found in single and three phase configurations and on the 3 phase units, just use part of the bridge. Cheap and easy to use.  Huge electrolytics are usually found in Swap Meet things or on the net.  On magneitics shipped. Insist seller box them up on USPS flat rate boxes and that will keep the cost down by a whole bunch.  You can ship a 1 KVA UPS transformer in a medium sized Flat Rate Usps box cross country for around 15 bux. Just tell sender to use lots of cardboard or chunks of 2X4 to ensure the unit does not tear itself out of the box.
Cheers
Bob, ke6f


-----Original Message-----
From: mstangelo at comcast.net
To: ARC-5 List <arc5 at mailman.qth.net>
Sent: Mon, Sep 5, 2022 5:12 am
Subject: Re: [ARC5] 24vdc power

Nice job.

The problem is where does one find big iron these days? The surplus houses don't have much anymore. Even if they had it the shipping costs are prohibitive. I guess you can find the transformers at hamfests.

Mike N2MS

> On 09/05/2022 2:15 AM Charles via ARC5 <arc5 at mailman.qth.net> wrote:
> 
> 
> For the small loads mentioned here, that approach is a good one, although I have read that battery life may be limited. Unfortunately for larger SLA or flooded batteries, and switchers too, the price increases more than proportionately ;)
> It was actually cheaper for me to buy some of the components for the brute force PS than to buy batteries (and switchers).
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