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Why are 12v lifepo4's cheaper than individual cells? What's the catch?
#11
3.2 x 123ah x 8 gives you ~3kwh = 1100 + postage

12.8 x 100ah x4 gives you ~ 5kwh = 2000 ish
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#12
A youtube channel "DIY Solar Power with Will Prowse" if full of recent videos on tear-downs of these LifePo4 batteries with evaluations / comparisons and sourcing (with links/prices)
Here's some examples
- Fortune LiFePO4 Battery Cells: I love them! - https://youtu.be/buNxclZixuU
- Cheap 120Ah LiFePO4 Al Cased Aliexpress Cells: Are these Grade B? - https://youtu.be/p_s53GGUElQ

My sense is that this guy is 'for real', been at this a long time, and pretty up to date. At the least, I think you can get a good idea ofwhat a tear-down is like on some of these "12v batteries"... some are gooky and some are even smelly Smile
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#13
(02-29-2020, 10:25 PM)OffGridInTheCity Wrote: A youtube channel "DIY Solar Power with Will Prowse" if full of recent videos on tear-downs of these LifePo4 batteries with evaluations / comparisons and sourcing (with links/prices)
Here's some examples
- Fortune LiFePO4 Battery Cells: I love them! - https://youtu.be/buNxclZixuU
- Cheap 120Ah LiFePO4 Al Cased Aliexpress Cells: Are these Grade B? - https://youtu.be/p_s53GGUElQ

My sense is that this guy is 'for real', been at this a long time, and pretty up to date.  At the least, I think you can get a good idea ofwhat a tear-down is like on some of these "12v batteries"... some are gooky and some are even smelly Smile
It's funny that you say smelly because at the moment all I've got is 2x old 12v 100a/hr SLA in parallel of which one bad cell pulls it down to 12.3v. I just have a timer and arduino-controlled relay with voltage sensor to spend a few minutes each day topping them up to 14.2v then turning off, just in case we lose power and need a very short term supply. 

Oh yes that's what I was going to say - smelly! Charging the lead acid batteries is smelly enough (very modest whiff though granted.)

(02-29-2020, 09:26 PM)slimf Wrote: 3.2 x 123ah x 8 gives you ~3kwh = 1100 + postage

12.8 x 100ah x4 gives you ~ 5kwh = 2000 ish
Yeah they work out about the same per watt-hour (within about 3.5%.)

Know how much you can get 18650 cells for each total cost in Australia if I was going to get around 600 of them?

Although after I end up spending a few hundred on tools etc. I'd prob only save a few hundred using 18650's for a 5kw/hr, with a greater chance of getting a dead cell to change.
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