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RvEd, I can’t answer your question directly, but will give you a couple of points to think about.
First, I’ll admit to being biased because I like idea of lithium batteries a lot, but would not personally spend the money it takes to upgrade to lithium if I was left with such slow charging rate. To some degree it defeats the purpose. If I was going to upgrade, I’d upgrade all the way including wiring as needed. If not practical to rewire, I’d enjoy system as is.
Many who upgrade to lithium batteries do it so they can power high-capacity inverters which require large low voltage (12-V) conductors. If you’re thinking of going this route, you can buy an Inverter/Charger with a high capacity converter built in, and they will also have the transfer switch built in. People who do this often install Inverter/Charger near batteries to keep cables short, and then turn off the motorhome’s converter by opening its breaker at panel. That way you can keep it as a back-up in case Inverter/Charger goes out.
One last thought to consider. Even the 80 Amp converter uses up to 1,300 watts. If you upgrade to that level, or even higher, you’ll be using as much power as an air conditioner, or maybe more. If you have a 30-Amp motorhome, you may want to do an electrical energy estimate to make certain you can run essentials at same time. With a 50-Amp motorhome, supplying enough power to converter should not be a problem.
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