If you discharge a deep cycle lead acid to 50% compared to 80% you've taken 10 years off its service life....
You can discharge most large format lithium down to 20% will little ill effect , management systems for lithium are common cheap and reliable , and lithium is almost 100% recyclable just like lead acid ....
Don't get me wrong , I have a 500 ah 48 volt bank of sealed AGM lead acid Mil spec units in the shed that will grow to around 2000 ah for the house I'm in. I choose these as I can buy them at scrap price after 3 years use (and I know they have sat the whole time on charge except for a few cycle capacity tests) and at 20% DOD they have a 15 year warranty, Not that I could claim it.
By the time they're dead Lithium will be as cheap as lead acid.
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