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On Tue, 22 Nov 2005 12:55:29 -0800, "Bob Headrick"
wrote: "Highland Ham" wrote in message .. . Bob , Interesting info ; can you confirm that the 18 pcs 12V battery were in fact 9 strings of 2 batts in series (each string having a fuse ) providing 24 V ? or were all the 18 batts in parallel ? Actually they were all in series, making it a bit nerve-wracking to replace a battery in the string. - Bob W7OV 216 volt battery pack??? I don't think so. |
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#4
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Yes, very possible !
Exide models as well at the other big boys Liebert etc. use this configuration. They use torrid transformers, very compact, the entire assy about the size of a loaf of white bread ! The ups w batteries about 36" cubed. 12 KVA 3 phased. dude 216 volt battery pack??? I don't think so. No, quite possible and makes some design sense - they would not need a heavy output transformer in the unit boosting the voltage of a 36V or 48V battery string after converting it to a sine wave AC, as 216V would be right around the sine wave peak voltage of 120VAC. Just run the battery DC through two sets of power transistors to let through a reconstituted sine wave - one for the positive half of the output waveform, the other negative. And it cuts the current the transistors have to pass. -- Bruce -- -- Bruce L. Bergman, Woodland Hills (Los Angeles) CA - Desktop Electrician for Westend Electric - CA726700 5737 Kanan Rd. #359, Agoura CA 91301 (818) 889-9545 Spamtrapped address: Remove the python and the invalid, and use a net. |
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