Using Portable Power Station to charge Batteries in Winter Storage

[profcbutler]

I have an 2025 R25 that I have just locked away for the winter in a covered storage facility. The parasitic battery drains have been removed. The house, engine, and thruster batteries are currently topped off. Since I am inside this year the solar will not be providing a charge to the batteries. Also, I do not have access to power where I am at. I know I can remove the batteries, bring them home and put a charger on them or I can just wait till spring and charge them up when I commission the boat.
I have already gone down the theoretical road with ChatGPT and Gemini on this question (AI is a little fuzzy on the actual power drawl)
Has any one actually used a portable power station to charge the batteries. Since my boat will be in storage for about 6 months, I was thinking about going down once a month and charging up. In theory the beauty of the solution is that I don't need any special wiring or additional process (Utilizing the the shore cord and the inverter capabilities on the portable power station)...has anyone done this? Any Challenges? What size Power Station did you use? How long did it take to top the batteries?

 

[Martin610]

I use a Bluetti AC 180 to charge the batteries. I have AGM batteries. I do this about once a month. Works well for me since I like to check on things anyway. Amazon has adapters you can buy to plug into the shore power receptacle.

 

[profcbutler]

Martin, Thanks for the fast response. Looks like the ac180 is 1800w peak. Very helpful to know your charger does not overload it.