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09 /20/ 25, 10:47pm

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Subject: 12 volt power problem Author: BFW [ Next Thread | Previous Thread | Next Message | Previous Message ] Date Posted: 05/ 26/ 03, 3:57pm I have a 1980 35'FC Battery charger is a new iota 75amp I am getting 13.6 volts output at the charger and each load center which is spec for that unit under no load. However when a 28 amp(lights,waterpump.etc) load is applied to the unit the voltage drops to 12.9 volts and will continue droping if I turn on heaters spots etc. It is not good to run lower voltage I have redone all the conections under the step at the starter and at the shunt they are all good. Even though I have 12.9 v at the load center I read 13.6 at the charger. Does anyone have a clue aside from running all new wires to each load center from the charger? Is this normal for 1980 BBS? Also I had disconected both sides of the shunt and all batteries yet when I turned on the charger/inverter to ck input voltage at shunt I was supprised to find the lights came on with about 10v does anyknow where this power came from? [ Next Thread | Previous Thread | Next Message | Previous Message ]

Replies:

[> Subject: Re: 12 volt power problem Author: Don Duncan [ Edit | View ] Date Posted: 05/ 30/ 03, 10:33pm I cleaned the heck out of all the terminals I could find including the positive post (frame mounted and very dirty) that goes to the batteries suspecting that dirt might be providing a path to ground. My voltage drop is now about .01V between the charger and engine battery bank. Before this, and with the dying old chargers, I got about a .5V drop. I can't say that cleaning was the solution but with my coach constant tinkering is paying off. No telling when or where I might have truly corrected the problem. I have not intentionally done load testing but no longer see a significant difference (.1V). Depending on how much your charger is helping out though you would expect to see a voltage drop at they batteries the more they carry the load. 1980FC30 [ Post a Reply to This Message ]

[> Subject: Re: 12 volt power problem Author: Bob Dilks [ Edit | View ] Date Posted: 06/ 17/ 03, 10:14am My thoughts are you have a converter/charger problem, all other aspects being normal. Your "charger" should pick up all the DC load up to about 75 amps before the batteries begin to show depletion. However, your batteries may have "taken a set" by being discharged to low voltage and not fully recharged and are no longer capable of being fully recharged. The nominal voltage of a fully charged 12 volt battery bank without input or output is 12.7 volts. Turn off your charger, let the batteries rest for a day and test the charge across the entire bank. The surprise voltage you received when your inverter/charger was turned off was likely from the generator start battery. [ Post a Reply to This Message ]