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Old 07-24-2015, 07:52 AM   #11
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Originally Posted by mike837go View Post
I treat my battery and charger relationships the same as my love life, now.


One-at-a-time, exclusive.


Avoids many complications. (Ask me about the divorce.)
Wise man! On both counts.

Note that most answers here saying you can safely use two charges in parallel to charge you battery (house charger and external charger simultaneously) add the disclaimer, "I think," or "IMO." I suppose if you disconnect the battery from the house charger and use the external only, you will be safe, but that's not what you asked. Without knowing exactly how either of these chargers are configured and what features they have, you can't know for sure. But you can learn by experience - which could be costly and/or dangerous.

My advice is use the generator to power your trailer while you use the external charger to charge the battery. That is safe, 100% guaranteed. No guessing.
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Old 07-24-2015, 11:40 AM   #12
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you need more info, batteries have a maximum charge rate depending on the size, and you need to know what the max charge rate of your converter is, if the converter is lower than the max rate of your battery, then yes you could benefit from a bigger charger, otherwise you might just be damaging the battery. are you sure the battery is not fully charged during the day, and just runs out of power during the night because it's on it's last leg and capacity is low? how old is the battery?
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Old 07-24-2015, 11:47 AM   #13
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Thanks, Battery is new, external charger brings it up much quicker than the TT. While charging on TT 13.3 V. While charging on External Charger 13.9 V.
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Old 07-24-2015, 12:05 PM   #14
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Thanks, Battery is new, external charger brings it up much quicker than the TT. While charging on TT 13.3 V. While charging on External Charger 13.9 V.
13.3v seems low,

my WFCO controler has these voltages
13.2V DC “float” mode,
13.6V DC range “absorption” mode,
14.4V DC range “bulk” charge
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Old 07-24-2015, 12:16 PM   #15
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Thanks, Battery is new, external charger brings it up much quicker than the TT. While charging on TT 13.3 V. While charging on External Charger 13.9 V.
13.3V seems kind of low. I'd be thinking more around 14-14.2V. You may have a dead cell in the battery. Also - for a deep cycle or marine battery, the quicker you charge it, the faster it will discharge. That's why a slow, trickle charge is better - the charge lasts longer.
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Old 07-24-2015, 12:23 PM   #16
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Thanks, The values I posted were "while charging" The built-in TT charger does not work as well as the external "cheapy" Minn kota external charger.


Could I have a "ground or other" issue in the camper affecting the TT charger performance? As I'm still a newbie to this TT camping I am wondering about the converter/charger/wiring/ fuse/ breakers etc...


I guess it will come with experience.....
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Old 07-24-2015, 12:32 PM   #17
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It is my experience that the inverter produces as much 12V power as the systems are demanding, while simultaneously, the built in charger maintains/charges your battery. To prove that, plug your trailer into shore power. You should hear the inverter/charger making a slight hum. as you turn on more and more lights and other 12V circuits, the inverter steps up and makes more noise. If it doesn't, that could be your problem.
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Old 07-24-2015, 12:57 PM   #18
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Thanks, Great Suggestion. I'll try that.
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