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12V-100AMP Supply for $20.00!!

Discussion in 'Home Brew' started by unit_399, Jul 9, 2012.

  1. Onelasttime

    Onelasttime Sr. Member

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    I got mine off ebay. It is hard to find actual NOS but really the used ones if working pulls at worst should not need more than a recap. The 1200w on up can be a bit pricey but the 800-600W range can be had often under $16 with free shipping. Often they do not come with a mains power cord. Some do not have a 3 prong plug at all but get their mains power from the blades/pins on the back of the unit.

    Since these are designed to have logic controls telling it what to do 98% need to be "hot-wired" for lack of a better word to function outside of their native back pannel server interface you normally find them in. IN most cases there will be 2-3 pins that must be grounded to power it up and you have to hard wired some wires or connectors to it to get the power out in a safe easy to hook up to way.

    They do not plug and play you have to adapt them. Each type converts a bit differently.

    A lot of them are functional from 100V to a bit more than 240V. Some though are only operational at 220V+. In the USA the ones that will not work bellow 220V tend to be much cheaper since so few people have any wiring beyond the circuit break prewired for anything other than 120. On the other hand in Europe these units command top dollar since that is not an issue. In the USA you will see 1500W IBM 220V+ only units sell for $16 sill sealed in boxes.

    You can use a 10K resistor to prob and multimeter on low voltage power supplies bellow 48V. It is easier though to either locate someone that has already figured it out and has tossed up a pin out. If you stick to the known models and conversion methods it would make life easier. Once you get the hang of that then get into figuring out less well-known units.



    I hear some of the Sun/Cisco units made by Sonny will fire up just turning them on and that there is no real conversion other than installing wires to the output pins and turning the power switch on. No experience with them.

    HP DBS-600PB is prop. the easiest conversion on earth but they are getting harder to find and only do a bit more than 40amps. HP and Dell 12Vpower supplies in the 750-1300W range tend to be the most popular models and have well-published conversion documentation.

    Tallman what are the model numbers off your unit's? I can at least tell you if I have any documentation on how to convert them. Two of my 3 units are well documented but one is an oddball and not well documented at all and took some digging to find an already figured out conversion.

    The biggest issue with some units is how tightly regulated they are. A lot of them are 11.895 volts and while you can get a lot of them to function up to 13.3V any higher and they will start to trip a fault under load.

    The upside is they are 80%-98% efficient and can function 24/7 a listed output and most will allow upwards of 110%-120% of listed output without overheating or tripping a fault so long as the load builds and is not sudden.

    A lot of people in this hobby like to have 13.8V-15V and few of these will allow that sort of voltage. The few that will require internal bypassing of smd components before they will allow you to crank up the power to 13.8 without a fault.

    If I recall properly MFJ's older ALS-500 solid state rf amps that used Toshiba 2SC2290's said in the owners manual that for every volt bellow 14V that unit lost 84 watts of output power compared to it's rated output at 14V. It was designed for use in a car and car's 12V system is not at 12V unless the battery is dead most of them are in the 13.8V-15.5V range depending on brand, tempature and condition of the battery.

    So in order to get cheap price and insane durability we give up some voltage when converting a server supply. In base operation, our antenna systems are so much better than in a mobile that most of us do not care about the loss.

    If you go used you can often get a 750W server supply for $9-$12 often with free shipping. If add in $6-$12 for high temp long life cap's that is a steal. You would have to spend $145+ to get close to that and it would not be built anywhere near as well!
     
    #91 Onelasttime, Dec 13, 2017
    Last edited: Dec 13, 2017

  2. 309hellinois

    309hellinois Active Member

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  3. Onelasttime

    Onelasttime Sr. Member

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    My HP Proliant DL580 G2 Power Supply Module 192201-001 weighs 9.4 pounds. It is rated at 800W no dual listing to accommodate 200-240 which is it is also approved for. I have not had the tins off yet to see where all this weight is coming from. It could be heavier sheet metal, bigger cap's, more copper etc.....Oh this is NOS Still in the heavy pink plastic vacum sealed. $19 free shipping ebay. It is also 20%-30% larger than the 1300W unit I have listed bellow it.

    HP ProLiant Hot Swap 1300W Power Supply 406421-001 HSTNS-PA01 337867-501 Is dual rated 100-120V 910W. 200-240V it is rated for 1300W. It weighs exactly 4 pounds. NOS $50 free shipping ebay also vacuum sealed in heavy pink plastic.

    My HP DL 380 Power Supply, Model DPS 600PB-B, Series ESP135 is also NOS also in vacuum sealed heavy pink plastic. $10 for it and $9 for shipping. Still waiting on it to arrive.
     
    #93 Onelasttime, Dec 16, 2017
    Last edited: Dec 16, 2017
  4. Onelasttime

    Onelasttime Sr. Member

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    Hamsupply sells these for RF use. Their price for these is really good!

    Samlex SEC-1250UL – 12 VDC (13.5 – 14.4) 50 Amp Power Supply/Battery Charger (limited quantity)

    The bellow is just to give a sampling of prices low to high. They do this same thing on their site linking to ebay.

    https://www.ebay.com/itm/Samlex-SEC...ash=item25e479338a:g:A0gAAOSwDFBaIEEF&vxp=mtr

    Now compare these which I am sure are excellent units to the prices on similarly output server power supplies. The potential cost savings can be huge. I was thinking about converting one (server supply) for my Mom and Dad to use in their camper.

    I should again add that Hamsupply is selling these at a much lower price point than most and counting Idiom Press as well they have been around a long time supplying specialty products to Hams designed and built initially at least by Hams(no idea if that is still true). I own 2 of their SCAF-1 Bandpass filter kits and wanted to make my bias clear I am not completely impartial.

    If you are not up to rolling the dice on a server supply and converting it these might represent just the ticket for you from a trusted source.
     
  5. Tallman

    Tallman W9WDX Amateur Radio Member, KW4YJ EXTRA class

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    Samlex SEC-1250UL – 12 VDC (13.5 – 14.4) 50 Amp Power Supply/Battery Charger (limited quantity)
    This supply cost $274.95

    You could buy two MegaWatt for that price and hav 100 amps on tap.

    https://www.ebay.com/itm/Samlex-SEC...ash=item25e479338a:g:A0gAAOSwDFBaIEEF&vxp=mtr
    And this supply is over $470.00

    You could buy Four MegaWatt power supplies and have 200 amps on tap.

    The MegaWatt 50 amp supply Only cost $110.00 and there are no modifications necessary to use.
     
    #95 Tallman, Dec 22, 2017
    Last edited: Dec 22, 2017
  6. Onelasttime

    Onelasttime Sr. Member

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    I thought I would give you guys an idea about how fantastic our larger 800-1300 watt server supplies are even at $50 for a NOS item.

    Cosel is a high end Japanese power supply OEM. These are even better built than a server supply but not by as much as you would think! Here is a 636W 53A nominal supply. $446 https://www.mouser.com/productdetai...3th5F8koJlxMu8VzQFeRyrRq7Z%2bzxMDlCPQAE6o0Q==
     
  7. Onelasttime

    Onelasttime Sr. Member

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    I agree with what your saying. That said I wanted to not only highlight various products in the market place at about $200 less than the normal market price. I was also looking to highlight the extreme value of used server power supplies. The Samalex unit is popular with people in the RV world, ham world and fairly common in the boating world too. Compare and contrast.
     
  8. dave457

    dave457 Sr. Member

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    Did you ever get this to try out?
     
  9. 309hellinois

    309hellinois Active Member

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    I couldn't find my soldering iron in storage. I have a new one arriving Thursday. I will post pics when done.
     
    #99 309hellinois, Jan 1, 2018
    Last edited: Jan 1, 2018
  10. 309hellinois

    309hellinois Active Member

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    This is the exact same power supply (dps-750rb a) I got from tba years ago. It worked great at 12v. I dug it out of the tote with radio accessories to check. I used a 390 ohm 1/2 watt resistor to get it powered up. I found another post about raising voltage which I want to try. I will update later if it works.[​IMG]
     
    #100 309hellinois, Jan 2, 2018
    Last edited: Jan 2, 2018
  11. 309hellinois

    309hellinois Active Member

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    This is what I received from amazon.
     

    Attached Files:

  12. dave457

    dave457 Sr. Member

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    Do you need a resistor or just apiece of wire
     
  13. 309hellinois

    309hellinois Active Member

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    The link says a jumper but back when I did this I read a resistor on another site. I can confirm that the resistor works but I will try a jumper on the new one.
     
  14. dave457

    dave457 Sr. Member

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    Cool, thanks
     
  15. 309hellinois

    309hellinois Active Member

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    You're welcome. I'll update more once I work on the next one.
     

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