Guys for those who have each type I would like to know your opinion.

I start my system with low quality small solar AGM with the plan of replacing them after one year but shortly I realize that I need more because the manufacturer wasn't honest about the capacity, meanwhile I had friends with AGM for UPS that don't need them and I decided to mix and they worked very well, so well that 90% of my energy came from them.

- My solar deep cycle brand new 2022 build were toasted after 2 months holding at most 50%

- AGM from Schneider UPS bought 5 years ago and stored without use or maintenance for 2 years, are in 100% state after 3 cycles.

- AGM from another UPS decommission after 10 years of use and stored without maintenance for 2 years are now at 60% after 2 cycles.

Since in my country there is no stock for LiFePO4, prices are increasing and warranty for China products is a myth I start to look for industrial wet lead acid because with them I know what I'm buying, the initial investment will be 50% less and they will last over 10 years. 

My only 2 concerns are the smell and weight, but I have place for them that is well ventilated.

On the other side I see in alibaba good prices for LiFePO4, but I know that there is no warranty and will get used or B , C grade.

Deep cycle Lead Acids all seem to have the same sort of cycle life, i.e. +-500cycles at 80%dod going up to +-1000 cycles at 50% dod 

I would check out the battery manufacturers spec sheet before you get your lifespan hopes up too much .

 

Looks like AGM batteries get a few more cycles out of them 

 

My solar that last less than 60 cycles should provide 600 but data is not true, because I plan to replace them after 1 year I was discharging at 70% to a voltage of 12V before we commit to a battery we should test it or use a reputable brand.

The HRC 7 year old battery are working fine so the problem is quality of my solar ones.

A good industrial lead acid can last 10 years without problems has long we use one made for deep-cycle, probably I will buy this brand because the ones that I have with 12 years are Exide and still work.

The flooded are cheaper but have smell and maintenance

Those are great for warm places

 

There are very good tubular cells to be had and they have been used in the Telecoms industry for decades.
These 2V cells can be had from 100Ah up to 3000Ah with 20 calendar year lifetime and 4000cycles with DOD of 30%. The question is at what cost if one needs 24 of them for a 48V system.
Anyone know the local pricing of these 2V batteries?

https://www.bravabatteries.com/opzv/

Edited October 29, 20223 yr by zsde

45 minutes ago, zsde said:

There are very good tubular cells to be had and they have been used in the Telecoms industry for decades.
These 2V cells can be had from 100Ah up to 3000Ah with 20 calendar year lifetime and 4000cycles with DOD of 30%. The question is at what cost if one needs 24 of them for a 48V system.
Anyone know the local pricing of these 2V batteries?

https://www.bravabatteries.com/opzv/

Not much wrong with lead acid 2V cells. 20yrs is normal but one needs to look at the conditions they are used. Mostly if not all are in air conditioned rooms with ventilation as well as for the safety aspect running water and a lot of times a shower in case of an acid spill. This means not just reading the temp as part of the spec but adhering to it.

The China manufacturers trying to get in the market would clearly state that these should be replaced after 10 years. This is from a battery dealer who had/has big contracts in place to supply these cells.

Those look good but also the ones I bought made in china, I won't repeat that mistake twice, buy good proven ones.