Topic: WONDER DRAGONFLY LITHIUM BATTERY QUESTIONS (Read 949 times) previous topic - next topic

We just purchased a 2023 Wonder MBL and it came with two Dragonfly 100 amp hour lithium house batteries.  We travel with a pet and would like to be able to run our air conditioner off battery power while we are away from our LTV, since we often park at trail heads while hiking and don’t want to disturb others by running our generator.

Instead of removing our two new Dragonfly batteries and replacing them with something like a Lithionics Boss 302 single battery, could I simply add another 100 amp hour matching Dragonfly (or similar) battery to the two I already have?

My thought is by aggregating the three I’m essentially achieving very close to the same power output as the single Lithionics replacement.  There is an empty storage bay next to the Wonder’s battery compartment that could conceivably be used.  If adding the extra battery would work, I of course understand that I need to upgrade my inverter to a 3,000 watt unit and undoubtedly mount some additional solar panels on the roof (I currently have only 200 watts).

So, my questions are, has anyone done this and/or is it even feasible — or is switching everything out and replacing the OME batteries with a larger single battery the preferred course of action?  And if that’s the consensus, is there a used market for my new Dragonflies (I hate to just dispose of them)?  Any advice and suggestions would be greatly appreciated.  Thank you!

There is lots of information on the Unity Sprinter forum about doing Li-On battery upgrades with lots of How to Guide with a few videos added recently.
and there is a Facebook Leisure Travel Van upgrade that has similar or the same info.

You can add 10 batteries of you want but adding another one to your existing bank is no big deal. Just make sure all the cables to each battery are all the same length as that is very important connecting each battery. Don't get a Li battery as it is not needed and about $4k for a 320ah battery. With 300ah your ac will work fine for several hours. Make sure you put a Soft Start on your AC and can monitor the temps remotely. Get a smart thermostat is easiest for temp monitoring.