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You can get a current limited 48V power supply on ebay pretty cheap:
http://www.ebay.com/sch/i.html?_from=R40&_trksid=p2047675.m570.l1313.TR7.TRC2.A0.H0.X48v+power+supply.TRS0&_nkw=48v+power+supply&_sacat=0 They almost always have a trim adjustment so you can bump it up or down 10% or more. Harry Landis > Date: Wed, 17 Jun 2015 23:10:47 -0400 > From: lists freerangeelectric com > To: elec-trak cosmos phy tufts edu > Subject: Re: (ET) Bumping up the charge voltage a tad > > The capacitor is on a special third winding, not as a filter cap but as > part of the ferroresonant design. The design makes it so the output > voltage is relatively constant regardless of fluctuations on the input. > ie adding the variac won't do much. > > Using a different power supply altogether sounds like a better path to > pursue. > > > On 6/17/15 10:33 PM, bushman165s aol com via Elec-trak wrote: > > I don't believe there is a good way to boost the voltage output on the > > stock chargers, simply because the voltage is built based on the > > secondary turns of the transformer and load resistance. Capacitor only > > helps as a filter to smooth the output, mostly. > > > > > > I have one dirty idea, but I don't know what the implications of it > > would be, so I'm throwing it out there for everyone else to pick it apart: > > > > > > Remove one battery out of the circuit and charge for an hour. This > > reduces the load resistance a little and gives you some overvoltage to > > desulfate the 5 batteries. Then swap the 6th in to perform the same on > > the last one, which you may want to do after a normal usage cycle. This > > idea allows you to leave all of the components in place without > > exceeding their specifications, as long as you don't do it after a deep > > discharge that would allow the charger to draw too much current on > > either side of the transformer. > > > > > > Sounds crazy, even to my liking, but it might work! > > > > > > Chad > > > > > > ------ Original message------ > > > > *From: *CZ > > > > *Date: *Wed, Jun 17, 2015 9:29 PM > > > > *To: *elec-trak cosmos phy tufts edu > > <mailto:elec-trak cosmos phy tufts edu>; > > > > *Subject:*(ET) Bumping up the charge voltage a tad > > > > Thought: Anyone know of a way to bump the charge voltage of the E20 charger up a bit? I run the NiCDs, and I really should charge them to 45 volts, not 42 to blow the oxygen off the plates every once inawhile.Ch <http://awhile.Ch>ange the capacitor a bit? How about a boost transformer on the input (I could try a variac I have around). I already buck 240 to 208 on my car, I should be able to boost a bit. But how much?C_______________________________________________Elec-trak mailing listElec-trak cosmos phy.tufts.eduhtt <mailto: listElec-trak cosmos phy.tufts.eduhtt>ps://cosmos.phy.tufts.edu/mailman/listinfo/elec-trak <http://cosmos.phy.tufts.edu/mailman/listinfo/elec-trak> > > > > > > > > _______________________________________________ > > Elec-trak mailing list > > Elec-trak cosmos phy tufts edu > > https://cosmos.phy.tufts.edu/mailman/listinfo/elec-trak > > > > _______________________________________________ > Elec-trak mailing list > Elec-trak cosmos phy tufts edu > https://cosmos.phy.tufts.edu/mailman/listinfo/elec-trak |