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Unfortunately, it’s not strange. You don’t get a lot out of two “24” or “27” 12v batteries, especially if they are several years old. LED lights and TVs help a lot, but if you expect to run your whole coach, lights, fans, and an inverter for fans, TV, etc. you really need to upgrade your batteries and increase the number to four. As you have found out, however, when you do that, it takes a long time to charge up the batteries after you draw them down. You need to think of the whole battery, charger, inverter system and what exactly you are planning to use your batteries for. It may require a bigger alternator or 50 amp system.
When I was planning to spend a week in Denali National Park, I wanted to upgrade my batteries so that they would last the whole week. The National Park only let me use my generator for an hour or so per day. So I bought some small solar panels and upgraded to four batteries. Unfortunately, that did not help much because the “short pole in the tent” was the amount of amperage I could put back into the batteries. It really didn’t help to add two more batteries because I could not recharge them. I would have been better off to buy more solar panels and stay with two batteries.
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