If an off grid solar site is THAT critical to the level of importance it needs six nines of electrical feed uptime, average over a year, in my opinion it should be built as a dual A + B side separated, pair of identical solar panel + battery + charge systems, feeding all DC equipment that has dual -48 inputs (part102 radios, routers).
Costly yes. The sort of thing you can build with DHS money grants for local public safety radio systems. On Mar 5, 2016 8:24 AM, "Chuck McCown" <[email protected]> wrote: > First central office I worked in had a huge- huge- huge- selenium > rectifier stack. Plates about 1 foot square. It was in series with the > battery. The battery also had 25 cells. The selenium rectifier would put > in about a two volt drop under load. > > When the power was out, the flooded cells would do their thing and when > they got down to about 44 volts, a large contactor would short out the > selenium rectifier and then the office had 46 volts for a few more hours. > Other C.O.s had a special battery called a CEMF cell or counter > electromotive force cell, that did the same thing as the selenium > rectifier. > > Might be worth considering this idea again in mission critical > applications. Perhaps solar off grid sites with no battery backup. > > *From:* Jason McKemie <[email protected]> > *Sent:* Saturday, March 05, 2016 1:35 AM > *To:* [email protected] > *Subject:* Re: [AFMUG] Eltek Rectifier Huh? > > I had an Emerson cabinet with pre-installed Loraine rectifier setup that > had a LVD. I replaced it with an Eltek unit though, never used the LVD. > > On Friday, March 4, 2016, Eric Kuhnke <[email protected]> wrote: > >> I've never seen a low voltage disconnect on telecom rectifier + float >> battery setups. It's assumed that for a backbone ISP POP that you will have >> an auto start generator. >> >> Or that you would rather drain your batteries all the way to dead, >> damaging them, but keeping the equipment online as long as possible >> (customer SLAs and hoping the grid power restores itself before the battery >> string is toast). >> On Mar 4, 2016 2:19 PM, "Gino Villarini" < >> javascript:_e(%7B%7D,'cvml','[email protected]');> wrote: >> >>> thats weird, it leaves no space for lvd >>> >>> Sent from Outlook Mobile <https://aka.ms/qtex0l> >>> >>> >>> >>> >>> On Fri, Mar 4, 2016 at 2:16 PM -0800, < >>> javascript:_e(%7B%7D,'cvml','[email protected]');> wrote: >>> >>> Frequently the rectifier and batts both go to the bus bar in the fuse or >>>> circuit breaker panel. >>>> Some folks feed both the rectifier and batts through a circuit >>>> breaker. If you do that you need to make sure the breaker can handle the >>>> max output of the rectifer or more. When there has been an extended power >>>> outage the batts will max out the rectifier current. >>>> >>>> *From:* Scott Vander Dussen >>>> *Sent:* Friday, March 4, 2016 1:26 PM >>>> *To:* javascript:_e(%7B%7D,'cvml','[email protected]'); >>>> *Subject:* [AFMUG] Eltek Rectifier Huh? >>>> >>>> >>>> Trying to figure these things out! I purchased and built an Eltek >>>> rectifier product using these products: >>>> >>>> >>>> >>>> CG1S-AUN-VC COMPACT POWER SHELF / REAR WIRE 200AMP MAX 48V UNIVERSAL >>>> OUTPUT POLARITY >>>> >>>> BC2000-A01-10VC 48V, SYSTEM CONTROLLER W/ ETHERNET, NEXTGENERATION, W/ >>>> CLEI >>>> >>>> V0750A-VC RECTIFIER, 840W, 53.5V, 15A, FAN COOLED (BOTTOM TO TOP) >>>> -INPUT: 90-264VAC >>>> >>>> >>>> >>>> It seems like this just takes AC power and gives me 48v DC out. I was >>>> expecting it would also attach to a battery array and provide charging of >>>> those batteries plus use their power source if grid power was lost. Am I >>>> totally wrong on that? I don’t see any method of connecting batteries to >>>> this power shelf :/ >>>> >>>> >>>> >>>> Noob out, >>>> >>>> Scott >>>> >>>
