No prove lithium 1000 cycles

[Mike90250]

Ampster,
if I need e.g. 3Kwh per day I can get it with lead acid and still (in 2021) much more cheaper than with lithium.

and Mike,
20% DoD of quality FLA true deep cycle battery can give on paper a lot of cycles also.

True, but the FLA battery has a pretty well anchored lifetime, depending on the size of the debris sump. The tricks for Li have not yet been discovered
and so the ultimate end of life for a lightly cycled pack is still fuzzy. A few more years and more long term data will get filled in from the early adopters.
I've see about a half dozen early Li packs burned up, some starting small fires in the woods around here. Local vendors "red-necked" some Li systems
together before knowing how they really worked and I'm sure some dud cells were shipped the first several years too.

[GeorgeF]

Ampster,
if I need e.g. 3Kwh per day I can get it with lead acid and still (in 2021) much more cheaper than with lithium.

and Mike,
20% DoD of quality FLA true deep cycle battery can give on paper a lot of cycles also.

[Ampster]

................

Can someone convince me that I, in 2021, must switch to lithium if my lead acid is near eol ??

You are better off asking that question on other forums where there are posters who have used Lithium batteries for years. Most Lithium users have left this forum because there is not the critical mass of members in order to have a meaningful discussion about that subject. . The internet if full of information. Some chemistries are much more dangerous than others and there are risks of toxic fumes if they are ignited.
There is no reason to prove to you that you "must" switch to Lithium. It is a choice. There are still very good choices in Pb batteries. The commercial grid storage industry has evolved to Lithium for there own reasons that are easily discovered with some research.
I first started using them in an EV conversion in 2011 and stayed with them because they were more efficient, I now have 42kWhrs of Lithium batteries which I used to supplement my PV solar to reduce my energy costs.

[Mike90250]

The state of Li batteries has improved. There are major off-grid companies that now offer integration with a couple of Li vendors. The Li vendors warranty the batteries, and it's pretty accepted that as of now, Li batteries an only process so many watt hours in and out. If you use 95% of capacity daily, you wear them out in 4 years. If you use 20% capacity daily, you wear them out in 10 years. Maybe. It's not known yet, what calendar life can be expected from lightly used cells, or if an occasional deep cycle helps or hurts.
If you have been happy with FLA, I'd say stick with them for now, especially if you don't want to have to heat your battery bank in cold climates.

I have no requirement to change to Li, but I am able to maintain my bank with regular maintenance as expected. I know precisely my daily loads and seasonal charging capability from 10+ years of detailed daily logging and would be able to properly size and commission a Li bank when needed.

A "new to off grid" would have no data to plan with, only projected usage and harvest, so dumping a lot of $ into a Li bank, and reaching end of life in a year or two would be an expensive learning experience and create a sour off grid story. Many FLA banks have been destroyed by neophytes. Maybe the LI BMS will prevent those early deaths, maybe not.

[GeorgeF]

With great interest i've been reading a thread of 2016 where Sunking claimed that there was no documented proven record that Lithium can give 1000 cycles. (See attached screenprint)

I am wondering if now, year 2021, it is already proven that lithium can give lets say more than 1000 cycles @ 80% DoD.

If it is still unclear, I am then wondering why people are so interested in using lithium for offgrid use? Energy density is I think only for EV and portables relevant but not for offgrid home systems.

With just some cables & fuses deep cycle lead acid is ready to serve you, less headdaches and @ max 30% DoD the number of cycles of deep cycle lead acid RE series can be sky high, documented proven I assume. After more than 150 years existence of lead acid it can still be considered as reliable.

Can someone convince me that I, in 2021, must switch to lithium if my lead acid is near eol ??