I know two people who have had a solar system installed and both of them said they "think" they get a little better mileage...but it wasn't enough to tell a big difference.
They both said that for the expense, if they knew then what they know now...they would have never done it.
Although I'm not in the market now for new batteries, when it's time I will definitely take a look at lithium, talk to others that have them...then crunch the numbers before I pull the trigger.
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