Bob, >From the description of "five 20 A units in one box" it sounds identical to the Samlex SEC-100BRM as shown on the Samlex web site here:
http://tinyurl.com/358l57 The manual for the SEC-100BRM can be found at the Samlex site here: http://tinyurl.com/3a7aa9 Page 20 of the manual shows: Two modules equpped: No load = 14.00 VDC Full load at 40 amps = 13.65 VDC Five modules equpped: No load = 14.00 VDC Full load at 100 amps = 13.35VDC All five modules feed a common bus. The bus is then fed to the load terminals through a Schottky diode for battery isolation purposes. In my personal tests with an SEC-100BRM equipped with two modules I saw no-load of 14.00 VDC. With a 7.5 amp load the output dropped to 13.89 VDC. Not nearly as heavy a load as your friend was seeing. My guess is the output dropping one full volt is suspicious. And as fair warning, I have discovered errors in Samlex documentation before so I approach their specs with a wary eye. Doug ----- Original Message ----- From: Bob M. To: repeater-builder@yahoogroups.com Sent: Sunday, October 21, 2007 4:24 PM Subject: [Repeater-Builder] Samlex Power Supplies Is anyone running a Samlex 12V supply in a situation where they can measure the voltage regulation from minimal load to something near half load? A friend has one of their 100A supplies (five 20A units in one box) and he's seeing about 1V drop with a 35A load (2M power amp), which is a bit more than I'd feel comfortable with. I don't know how they connect the supplies in parallel, so this could just be normal drop through the combining network, if any. I can't find any specs regarding this on the Samlex web site or in their manual for the SEC-1223. I would hope the supply can hold the voltage to well within 1%. For comparison, Astron RS35 supplies don't drop at all, or if they do, it's under 0.1V, just losses in the wiring. Thanks. Bob M. __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com Yahoo! Groups Links -- No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.488 / Virus Database: 269.15.3/1082 - Release Date: 10/20/2007 2:59 PM
