Chris Hobson Posted October 9, 2015 Share Posted October 9, 2015 I have noticed something really weird. The batteries that have the highest voltage in the battery bank differ depending whether the charging is solar or AC. Can anyone explain this? Quote Link to comment Share on other sites More sharing options...
jhay Posted October 9, 2015 Share Posted October 9, 2015 Does the charging rate differ between solar and AC? Quote Link to comment Share on other sites More sharing options...
Chris Hobson Posted October 10, 2015 Author Share Posted October 10, 2015 Does the charging rate differ between solar and AC? Hi jhay. No they are the same 20A Quote Link to comment Share on other sites More sharing options...
___ Posted October 10, 2015 Share Posted October 10, 2015 Wild Guess. When charging from AC, the ripple current will be different, ie a small AC component might sneak through on the output and AC will have a different ripple frequency. A DC multimeter measures the "average", usually taking a number of samples per second and updating the display around two or three times a second for a lower-to-middle-class multimeter. So my guess would be that due to differing characteristics of the batteries they possible react differently to the ripple and produce a different "average" voltage.Sounds like the kind of thing I can attach my scope to... :-P Chris Hobson 1 Quote Link to comment Share on other sites More sharing options...
Chris Hobson Posted October 10, 2015 Author Share Posted October 10, 2015 I know this from the battery balancers. They are Chinese "pass the parcel" that we have discussed before. Under solar they pass up the battery bank and on AC they pass down the battery bank - wierd. When I had my Zeners and was logging battery voltages they use to do the same thing. Quote Link to comment Share on other sites More sharing options...
edmundp Posted October 10, 2015 Share Posted October 10, 2015 Perhaps something on the AC ripple and the diode switching speeds? Chris Hobson and ___ 2 Quote Link to comment Share on other sites More sharing options...
Regie Posted October 10, 2015 Share Posted October 10, 2015 What about temperature differences when charging Quote Link to comment Share on other sites More sharing options...
Chris Hobson Posted October 11, 2015 Author Share Posted October 11, 2015 The batteries are all at ambient temp I am not charging fast enough to cause the batteries to warm up. Quote Link to comment Share on other sites More sharing options...
Regie Posted October 11, 2015 Share Posted October 11, 2015 Does all the charging take place at the same time. Night and day temp differs so does battery density with every 2degrees. Chris Hobson 1 Quote Link to comment Share on other sites More sharing options...
Chris Hobson Posted October 11, 2015 Author Share Posted October 11, 2015 Hmm Regie that is something I never thought of. AC charging is invariably at night when the communal generator is on. Quote Link to comment Share on other sites More sharing options...
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