If you really want a game changer battery, look at Battle Born or another lithium solution. If they live up to all of the potential, you can end up with something that is half the size, a quarter the weight and offers the same usable capacity and recharges so fast that you can replace the energy drawn by a fridge in 30 minutes or an hour from the alternator. The biggest factor for me is the charge time. Lithium recharges just about as fast as you can push the current to it. Lead Acid - including AGM, charges slower the closer it gets to full. IF you have a charging system that will put 100 Amps to the battery, it will still take 5-6 hours to put 50 AH back into a lead-acid battery, where you could put that back into a lithium battery in less than an hour.
You also get a significant bump in usable capacity. The combined wisdom of the internet says that you shouldn't take your lead-acid battery below 50%. So you get 50AH out of a 100AH battery. I disagree with that, and am content to buy a cheaper battery and beat on it down to about 80%. Hence the Flooded house battery in my install. Lead acid batteries also start to lose capacity if you don't recharge them to 100%.
Lithium batteries don't seem to care much. You can run a 100AH lithium down to nothing and it's happy. You can leave it at 50% discharged for weeks and its happy. in essence, Lithium batteries seem to be more like the bucket that we want a battery to be. But they are sensitive to voltage and overcharging. And they catch on fire. And they will accept current so fast, that your alternator will try to push them as much as it can generate, which means your cables will get hot and catch on fire. All of this can be controlled, but it takes equipment and knowledge. Despite the marketing materials, I don't think they are plug and play yet.
So lithium batteries wonderful, but they aren't cheap, they require special chargers and some knowledge to set everything up, and if you do it wrong you either kill a $1,000 battery or burn your truck to the ground.
Even so, ff I could go back in time and get back all of the money I have spent Forrest Gumping my way around on this stuff, I would get a 50 or 100AH lithium and a 60amp B2B charger from Sterling or someone. The way I operate, that would eliminate the need, or even temptation, to get solar, and I could just leave the fridge plugged in all the time.
You also get a significant bump in usable capacity. The combined wisdom of the internet says that you shouldn't take your lead-acid battery below 50%. So you get 50AH out of a 100AH battery. I disagree with that, and am content to buy a cheaper battery and beat on it down to about 80%. Hence the Flooded house battery in my install. Lead acid batteries also start to lose capacity if you don't recharge them to 100%.
Lithium batteries don't seem to care much. You can run a 100AH lithium down to nothing and it's happy. You can leave it at 50% discharged for weeks and its happy. in essence, Lithium batteries seem to be more like the bucket that we want a battery to be. But they are sensitive to voltage and overcharging. And they catch on fire. And they will accept current so fast, that your alternator will try to push them as much as it can generate, which means your cables will get hot and catch on fire. All of this can be controlled, but it takes equipment and knowledge. Despite the marketing materials, I don't think they are plug and play yet.
So lithium batteries wonderful, but they aren't cheap, they require special chargers and some knowledge to set everything up, and if you do it wrong you either kill a $1,000 battery or burn your truck to the ground.
Even so, ff I could go back in time and get back all of the money I have spent Forrest Gumping my way around on this stuff, I would get a 50 or 100AH lithium and a 60amp B2B charger from Sterling or someone. The way I operate, that would eliminate the need, or even temptation, to get solar, and I could just leave the fridge plugged in all the time.