(OT) Need 100+ amps supply

I sold tons of such supplies on ebay. 100 amp 10v HP units (HP 6260, if I recall correctly), also 100 amp 14v PP-1104C/G supplies etc. Look there. Heavy stuff, ask sellers to pack well.

i

You might look for switching type power supplies. I got a 5 volt 200 amp supply for $20 at HamFest flea market. You could just limit the current with power resistors, or possibly allow the internal current limiting do the regulation (unless it is fold-back type). You might be able to use an external 100 amp 50 mV shunt and a x100 amplifier to feed back to the sense terminals. This 1000 watt supply is only about 15 lb, while linear types would probably be over 50 lb. HamFests are a good source of this type of equipment. Heavy stuff usually sells really cheap, especially at the end of the show. Sometimes it's in the free pile.

Other possibilities are a battery charger with high current boost, or maybe a small welder. A lot depends on what kind of accuracy and ripple are acceptable. For your purposes, these specifications are probably not critical.

Paul

13.8v supplies are the most common in this sort of current rating at low prices (amateur radio equipment uses these). Switch mode units, are generally just over your 'target' pricing new, but turn up on ebay, or (in the UK), at radio rallies fairly commonly. Most have some small amount of adjustment of the output voltage. For example, in the UK, the SPS9620, is under £350, and gives 120A at 13.8v. Similar units are listed by a couple of the US Ham radio suppliers. An enquiry with one of these might find an 'ex-demo', or second hand unit, that would easily be in your price range.

Best Wishes

I forgot to say, but now realized, that I have a 200A at 5V power supply, it can be rewired to give 100A at 10V. Military surplus, I think by Kepco.

I have not yet tested it, but I can if anyone is interested. I would say $70 plus shipping takes it. It is very heavy, rackmount type. Local pickup west of chicago is encouraged.

i

and, obviously, I will test it prior to selling.

i

I'm interested. Is it an analog or switcher? Do you have any documentation or can you point me to any? A schematic would be perfect. A model number might help if I need to search for the documentation. I need to put a few hundred watts into an IGBT six pack.

Contact me off the group snipped-for-privacy@verizon.net

regards, Bob

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I usually look for stuff on ebay:

Have Fun! Rich

How about a car battery and a charger? Total: $100 or so.

-- Joe Legris

I will check in my garage. Will get back to you.

i

Kind of troublesome because they are not current limited...

i

I looked at mine. I do not think that it is in a sellable shape. First, the switch is broken physically.

I opened it up. I connected two 240V pairs of wires inside to bypass the switch and to always be on. The device now powers up (lights up), but there is no output. I suspect that it is something simple. The switch is three pole, or more, and I connected only the two pairs of hots. Some other little thin wires inside that go to that switch, are not connected, hard to get to. Also a lot of screws in the back with strange markings PROG R, REMOTE etc (remove prolly means remote sensing).

So, I cannot sell it in a working condition, will probably mess around with it when I get more time. I am sure that the military surplused it because they broke the power switch.

i

If you don't find what you want with a search, Ebay has a "Want It Now" site that you can use to describe what you want and people respond to your ad.

Luck be with you.

John