Topic: Dragonfly Lithium batteries not holding charge (Read 260 times) previous topic - next topic

I just bought a 2022 UnityFX and we are pretty new to this.  Stayed three nights at a campground with no hookups so made sure batteries were charged up with Generator and only had furnace on, batteries discharged in 3 hours.  We have 400w factory solar, (2) Dragonfly DFGC2H 100ah LiFePO4 batteries, factory 2k watt inverter and an Onan 3200 diesel gen.  Any suggestions on how I can tell if the batteries are bad or I may be doing something wrong, would be helpful

I have a similar setup with 200 watt factory, 2, 100-amp Battleborn batteries, and a similar generator on a 2020 Unity.  Unfortunately, I am learning as well, having picked her up early this summer.  That said, my first thought is what happens at home when you are unplugged?  Does it drain off then? If yes, try to see what is draining by seeing what happens with the inverter off.  At least that will tell you whether the drain is mainly AC or DC.  I would also look to make sure the refrigerator was not on DC mode instead of propane-mode. 

I strongly suggest you buy a Victron SmartShunt for $100.30 from Amazon and then you will be able to accurately see what is going on...once you set it up properly.  It would be very  unusual for the Dragonflies to die this soon in their life.

When you think you are full, are you really?  When you think everything is off, is it really?

The Smartshunt will show you what is really going on.  How much charge is going into the batteries?  How much current is coming out.  The Smartshunt is worth its weight in gold to let you see what is really happening to your batteries, and there is NOTHING that comes on the coach that gives you a good report on your bacttery activity.

That said,I wonder if you have your refrigerator on 12 volts.  That will take around 15A out each hour.