First Time Boondocking.....Need a few Questions Answered

Although it is not ideal, batteries are not smart so matching exactly is not necessary. Close is good enough, like horse shoes. I have 2 gp 24 and 1 gp 27 I add when off grid. Works great even with a residential fridge. 2 hrs of gen in the am, and 2 hrs in the pm if the heater is going to be used. All through the factory converter. Once again, maybe not perfect or as good as a smart charger but it only has to be good enough. Now if I had solar........