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One micro farad makes for enough difference to require extreme
caution.Watch things like a hawk, wearing adequate protection until you
are certain that all's well. RJ Tim Humphrey wrote: According to; Nawaz Qureshi Vice-President of Engineering U.S. Battery Mfg. Co. 1675 Sampson Avenue Corona, CA 92879-1889 <quote> "They need to be brought up to 2.583 Volts per cell and held there for two hours for a proper normal charge. Moderate gassing is needed to mix up the stratified electrolyte. It gets stratified because the more concentrated denser acid generated at the plates during charging goes to the bottom and needs mixing. " </quote> Unfortunately, 2.583 v/cell is 46.494 v/pack. The ET charger being a ferro-resonant device maxes out at 45v. So you may be suffering from chronic undercharging on this particular brand of battery. You could try to change the value of the capacitor to raise the voltage, but I'm not sure of how to compute what you would need. Stay Charged! Hump-----Original Message----- From: elec-trak-bounces cosmos phy tufts edu [mailto:elec-trak-bounces cosmos phy tufts edu] On Behalf Of tbamc Sent: Wednesday, April 22, 2009 9:49 AM To: elec-trak cosmos phy tufts edu Subject: (ET) Bad luck? bad lot? bad owner? I bought 6 new US 2200 batteries in the summer of 2004, when I got my E-12. They don't get much below 50% SOC before being recharged, I watch water levels carefully, check full pack voltage fairly frequently (during and after charging), occasionally check individual battery voltage, and don't have any accessory use that would unbalance the pack. I charge the pack before winter storage, and usually check it mid-winter to be sure it's ok. Last year when brought out of storage I found one battery at just over 4 volts. Couldn't charge it with a 6v charger and presumed a cell was gone, so replaced it. Thought it just unlucky. Same story this year. Found one battery at about 4v, 6-8 weeks ago. Got a replacement battery last week. After installing it, found ANOTHER battery at 4v. All others 6.1 to 6.3. I'm fairly certain I checked each battery 8 weeks ago, when I found the bad one, and the 'newer' bad one was ok, at that time. In addition, during that 8 weeks, the bad battery was removed from the E-T. So, 3 bad batteries in a pack that's been used for only 4 summers. Is there something I'm doing, to cause this? Do I need to look for a fault in the machine? BTW, FWIW when I bought a new US2200 recently the dealer mentioned that the more recent US Batttery (plate?) technology is now very similar to Trojan's. Thanks. Thon _______________________________________________ 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 |