24v Battery Bank Upgrade 2026 Micro Minnie 1800BH

[tenpercent]

Hey all! I have a new 2026 micro Minnie and I want to get myself boondocking ready, so I'm looking to beef up my power supply. Initially I planned on upgrading the tongue battery to a highwr capacity lithium 12v for the near term, but as luck would have it my friend has 2 100ah 24v lithiums that I am being given.

Here is my proposed setup. I'd love a sanity check on whether this makes sense, I'm new to all of this

-install both 24v batteries in the passthrough wired in parallel to get 200ah 24v bank.
-Add an additional 200w panel to the roof in series with my factory 200w panel to boost to 24v and 400w now
-replace factory solar controller with a 24v mppt, and wire that to 24v bank.
-wire 24v battery bank to a new DC to DC charger, 24v to 12v at 30a
-take existing wires (10 awg I believe) that used to run from factory solar controller and connect to DC to DC charger instead.
-the charger should now be connected to the 12v tongue battery which will function as normal
-ill also be adding a 24v inverter to my bank to handle ac draws (just plugged directly into my inverter, I'm not dealing with the inverter prep).
-finally, add a 24v charger that I can just plug into a 110 outlet in the trailer when I'm on shore power.

In theory, my solar panels would help keep the 24v bank topped off, and the DC charger would constantly drip power into the 12v acid battery. 12v battery would power all DC operations in the trailer as factory intended.

I know I can't run air conditioning off of this or microwave, etc. My goal is only to run fridge, some lights, fans, water etc with TV and a CPAP plugged into the inverter. Think 3-5 day boondocking.

I wanted to preserve factory setup as much as possible, so I know this setup probably isn't the most efficient...but will it work?

 

[godp1301]

Hi @tenpercent,

Lucky to have a generous friend like that I wanted to share some of my experience, if it can help.
I have a 2021 1800BH. I installed 2 100ah 12V batteries in parallel which I moved into inside the trailer, under the bed. I completely removed the original lead acid deep cycle battery. In 2021 there were no such things as inverter prep so I installed a 2000W inverter that I wired back to the ACDC panel using a 30amp relay box (to split inverter power from shore power). Using this setup, I'm able to manually turn on the inverter and power everything that's 120V in the TT. The TV, microwave and AC works out of the box although the AC would drain down the battery quite quickly. I also use a breville espresso maker each morning for wife an I. I am able to boondock for a bit more that 48 hours even if the heater fan is running. Note that I have a propane fridge which greatly reduces the battery power required.

I also replaced the solar controller with a 40A Mptt one. I plan on upgrading solar panels on the roof for 2 195W in series with the option of an additional suitcase 100W in parallel when needed. I'm also planning to install a 20A DCDC charger to isolate and minimally charge the battery bank while on the road. I will see if I change the AC converter in the future as the original does not support lifepo4 batteries. I switched off the breaker for the time being.

 

[sheilamcc]

That sounds like it is great for a lot of bookdocking which we will not be doing. Does anyone have any ideas about whether if is necessary to upgrade from 1000 W in a 2017 Navion 24V?

 

[sheilamcc]

We will use 2 CPAPs at night and likely a Crock Pot during the days or possibly the microwave, but not absolutely necessary.

 

[klook]

It will work, but it is not efficient.

 

[klook]

We will use 2 CPAPs at night and likely a Crock Pot during the days or possibly the microwave, but not absolutely necessary.

You cannot run the crockpot on a 1000W most likely and maybe not the microwave. Look at each of them and find the label that tells you how much it is rated at. Moving up to double the wattage in the inverter is not just adding an inverter. The wire from the battery must be sized for the added amperage.
Get with a professional before just wiring it up and using it.