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<body class='hmmessage'><div dir='ltr'>I built one almost two years ago using two HP 600 supplies. Adding a couple of resistors I was able to get the output to 26.1v pretty much regardless of load. I have pushed it to its rated limit and lots of on/off cycles with no problems. These are used components working out of there design parameters so of course there will be failures but so far mine has proven to be very robust and under $50.<BR>
Lots of threads about how on RC groups or buy it from Feathermerchant and just go fly.<BR>
Anthony<BR> <BR>
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Date: Wed, 3 Jul 2013 07:44:18 -0700<BR>From: getterflash@yahoo.com<BR>To: nsrca-discussion@lists.nsrca.org<BR>Subject: Re: [NSRCA-discussion] Power Supplies<BR><BR>
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<DIV><SPAN>Good question. I can tell you it has not caught my attention, the "24.x" volts displayed by the charger seems to be constant. I will pay attention next time I charge and provide some feedback. When I charge 10 cells at 4 amps the charger is drawing 7 amps from the supply, it drops to less than an amp toward the end of the charge cycle.</SPAN></DIV>
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<DIV>Bob Kane<BR>getterflash@yahoo.com<BR></DIV>
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<FONT size=2 face=Arial><B><SPAN style="FONT-WEIGHT: bold">From:</SPAN></B> Jon Lowe <jonlowe@aol.com><BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B> getterflash@yahoo.com; nsrca-discussion@lists.nsrca.org <BR><B><SPAN style="FONT-WEIGHT: bold">Sent:</SPAN></B> Wednesday, July 3, 2013 10:17 AM<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B> Re: [NSRCA-discussion] Power Supplies<BR></FONT></DIV>
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<DIV><FONT style="BACKGROUND-COLOR: transparent" face="Arial, Helvetica, sans-serif">Love the description on Amazon. In one place is says "Power source: Air Powered". That I'd like to see. In anotherplace, it says it is "cooling by free air convection", yet it shows a fan!</FONT></DIV>
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<DIV>Bob,</DIV>
<DIV>How stable is the voltage output at full load? One thing I've liked about the server PS's I've been using is that they are extremely stable between minimum and full load. I use the things day in and day out with many on-off cycles with nary a problem.</DIV>
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<DIV style="CLEAR: both"><FONT color=black face="Arial, Helvetica, sans-serif"><FONT color=black face=arial><SPAN style="FONT-SIZE: medium" class=ecxyiv1447645481Apple-style-span>Jon</SPAN></FONT></FONT></DIV>
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<DIV style="FONT-FAMILY: arial, helvetica; COLOR: black; FONT-SIZE: 10pt">-----Original Message-----<BR>From: Bob Kane <getterflash@yahoo.com><BR>To: General pattern discussion <nsrca-discussion@lists.nsrca.org><BR>Sent: Wed, Jul 3, 2013 9:02 am<BR>Subject: Re: [NSRCA-discussion] Power Supplies<BR><BR>
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<DIV><SPAN>No handles and it was never intended for public display. But it does have a full enclosure and a green LED.</SPAN></DIV>
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<DIV style="BACKGROUND-COLOR: transparent; FONT-STYLE: normal; FONT-FAMILY: 'times new roman', 'new york', times, serif; COLOR: rgb(0,0,0); FONT-SIZE: 16px">The case does have a couple of threaded holes so it could be easily mounted in a charging box.</DIV>
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<DIV>Bob Kane<BR><A href="mailto:getterflash@yahoo.com" rel=nofollow target=_blank>getterflash@yahoo.com</A><BR></DIV>
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<FONT size=2 face=Arial><B><SPAN style="FONT-WEIGHT: bold">From:</SPAN></B> Ronald Van Putte <<A href="mailto:vanputter@gmail.com" rel=nofollow target=_blank>vanputter@gmail.com</A>><BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B> General pattern discussion <<A href="mailto:nsrca-discussion@lists.nsrca.org" rel=nofollow target=_blank>nsrca-discussion@lists.nsrca.org</A>> <BR><B><SPAN style="FONT-WEIGHT: bold">Sent:</SPAN></B> Wednesday, July 3, 2013 9:55 AM<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B> Re: [NSRCA-discussion] Power Supplies<BR></FONT></DIV>
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<DIV>Yeah, but does it have cool lights and a neat handle?
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<DIV>On the serious side, that's a great find. Let's see 15 amps at 24 volts is 360 watts. Charging two 5S packs at 4 amps at a nominal 20 volts per pack is only 160 watts, so the power supply should work for two 10S packs. </DIV>
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<DIV>BTW, I am using two Turnigy 10XC chargers in my charge box.</DIV>
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<DIV>Ron Van Putte</DIV>
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<DIV>On Jul 3, 2013, at 6:48 AM, Bob Kane wrote:</DIV><BR class=ecxyiv1447645481Apple-interchange-newline>
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<DIV style="FONT-FAMILY: 'times new roman', 'new york', times, serif; FONT-SIZE: 12pt"><SPAN>I have picked up two of these from Amazon:</SPAN></DIV>
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<DIV style="BACKGROUND-COLOR: transparent"><SPAN>"Dc 24v 15a Switching Power Supply Transformer Regulated", they are around $25. Working well so far. No modifications needed, but you do need to wire a power cord and charger leads.<BR></SPAN></DIV>
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<DIV style="BACKGROUND-COLOR: transparent; FONT-STYLE: normal; FONT-FAMILY: 'times new roman', 'new york', times, serif; COLOR: rgb(0,0,0); FONT-SIZE: 16px"><SPAN>I use the Turnigy 10XC charger and usually charge at 4 amps. The charger draws 7 amps from the supply when charging a 10S pack so in theory I could run two chargers off this supply. </SPAN></DIV>
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<DIV style="BACKGROUND-COLOR: transparent; FONT-STYLE: normal; FONT-FAMILY: 'times new roman', 'new york', times, serif; COLOR: rgb(0,0,0); FONT-SIZE: 16px"><SPAN>I have also powered this setup from a cheapie 800 watt two-stroke generator a couple of times, no issues yet.</SPAN></DIV>
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<DIV style="FONT-FAMILY: 'times new roman', 'new york', times, serif; FONT-SIZE: 12pt">Bob Kane<BR><A href="mailto:getterflash@yahoo.com" rel=nofollow target=_blank>getterflash@yahoo.com</A><BR></DIV>
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<FONT size=2 face=Arial><B><SPAN style="FONT-WEIGHT: bold">From:</SPAN></B> Ronald Van Putte <<A href="mailto:vanputter@gmail.com" rel=nofollow target=_blank>vanputter@gmail.com</A>><BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B> General pattern discussion <<A href="mailto:nsrca-discussion@lists.nsrca.org" rel=nofollow target=_blank>nsrca-discussion@lists.nsrca.org</A>> <BR><B><SPAN style="FONT-WEIGHT: bold">Sent:</SPAN></B> Monday, July 1, 2013 11:50 PM<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B> [NSRCA-discussion] Power Supplies<BR></FONT></DIV>
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<DIV>A lot of electric-power pilots are building or buying charge boxes. Many of the charge boxes contain the <SPAN style="COLOR: rgb(51,51,51)" class=ecxyiv1447645481Apple-style-span>HP DL380 G4 </SPAN><SPAN style="COLOR: rgb(51,51,51)" class=ecxyiv1447645481Apple-style-span>DPS-600PB 12V/</SPAN><SPAN style="COLOR: rgb(51,51,51)" class=ecxyiv1447645481Apple-style-span>575W power supply. </SPAN>
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<DIV><SPAN style="COLOR: rgb(51,51,51)" class=ecxyiv1447645481Apple-style-span>Since they are so inexpensive to acquire and so simple to convert for our use, I'd like to provide some information about them.</SPAN></DIV>
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<DIV><SPAN style="COLOR: rgb(51,51,51)" class=ecxyiv1447645481Apple-style-span>These are so called "hot swap" power supplies. They are really tough and were designed to be used in a computer server 24/7. Their output is 47 amperes at about 12.5 volts. You can use two in series to provide </SPAN><SPAN style="COLOR: rgb(51,51,51)" class=ecxyiv1447645481Apple-style-span>47 amperes at about 25 volts.</SPAN></DIV>
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<DIV><SPAN style="COLOR: rgb(51,51,51)" class=ecxyiv1447645481Apple-style-span>You can buy them at places like eBay for about $15 delivered if you shop around, particularly if you look for lots of two or three. These power supplies cost upwards of $300 when they were in active use, but the servers they were designed to work with have been retired, leaving a lot of these server power supplies as surplus. Consequently, you can get them pretty cheap. </SPAN></DIV>
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<DIV><SPAN style="COLOR: rgb(51,51,51)" class=ecxyiv1447645481Apple-style-span>I usually show pilots with any measure of soldering skills how to convert them for our use. The conversion takes about 30 minutes. The rest, who can't solder or can't follow simple directions, I do the conversion for them.</SPAN></DIV>
<DIV><SPAN style="COLOR: rgb(51,51,51)" class=ecxyiv1447645481Apple-style-span><BR></SPAN></DIV>
<DIV><SPAN style="COLOR: rgb(51,51,51)" class=ecxyiv1447645481Apple-style-span>There is a great description how to do the conversion of the HP model DPS-600PB power supply here: <A href="https://sites.google.com/site/tjinguytech/my-projects/HP47A" rel=nofollow target=_blank>https://sites.google.com/site/tjinguytech/my-projects/HP47A</A></SPAN></DIV>
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<DIV><SPAN style="COLOR: rgb(51,51,51)" class=ecxyiv1447645481Apple-style-span>Any questions? E-Mail me offline.</SPAN></DIV>
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<DIV><SPAN style="COLOR: rgb(51,51,51)" class=ecxyiv1447645481Apple-style-span>See you at the Nats.</SPAN></DIV>
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<DIV><SPAN style="COLOR: rgb(51,51,51)" class=ecxyiv1447645481Apple-style-span>Ron Van Putte</SPAN></DIV></DIV></DIV><BR>_______________________________________________<BR>NSRCA-discussion mailing list<BR><A href="mailto:NSRCA-discussion@lists.nsrca.org" rel=nofollow target=_blank>NSRCA-discussion@lists.nsrca.org</A><BR><A href="http://lists.nsrca.org/mailman/listinfo/nsrca-discussion" rel=nofollow target=_blank>http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</A><BR><BR></DIV></DIV></DIV></DIV></DIV>_______________________________________________<BR>NSRCA-discussion mailing list<BR><A href="mailto:NSRCA-discussion@lists.nsrca.org" rel=nofollow target=_blank>NSRCA-discussion@lists.nsrca.org</A><BR><A href="http://lists.nsrca.org/mailman/listinfo/nsrca-discussion" rel=nofollow target=_blank>http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</A></BLOCKQUOTE></DIV><BR></DIV></DIV></DIV><BR>_______________________________________________<BR>NSRCA-discussion mailing list<BR><A href="mailto:NSRCA-discussion@lists.nsrca.org" rel=nofollow target=_blank>NSRCA-discussion@lists.nsrca.org</A><BR><A href="http://lists.nsrca.org/mailman/listinfo/nsrca-discussion" rel=nofollow target=_blank>http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</A><BR><BR></DIV></DIV></DIV></DIV></DIV></DIV>
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