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jahs0ldi3r wrote:Just scrap old laptop batteries, most of them contain 18650 lithium batteries which you can series and parallel connect to suit your voltage, amperage and power needs
Was onto that but sold ask I had to a guy here on tuner who wanted to build a diy tesla power bank for his house
X_Factor wrote:18650's have small little ah rating
you need cells that have on average 5ah and up
most common are
yin longs 18650.
..headway 38120
ford cmax ( those guys in the states get them from wrecked electric vehicles)
li mn cells which look like the pic above
This or 8 21700 batteries for similar energy storage.X_Factor wrote:another pic for size reference
the messy thing about using 18650 is way more batteries to properly wiring in a bms to balance charge the pack...
i dont think they are made to charge at the high amperage of an alternator
failures could creep in and could mean fire
You may not want to use smaller cells but if designed properly, a bank of smaller cells has higher energy density.X_Factor wrote:18650 cells are too small in capacity and using to many can result in problems
66160 are the preferred for this purpose
X_Factor wrote:ok so my hurdle is lithium batts like these need hazmat clearance to ship which is around 200usd
also with the ibs charging system in the car it may not charge the bank properly
That will provide 11.25 Ah of charge capacity. A small 12 volt UPS battery will provide 12 Ah.88sins wrote:X_Factor wrote:ok so my hurdle is lithium batts like these need hazmat clearance to ship which is around 200usd
also with the ibs charging system in the car it may not charge the bank properly
since it's for car audio purposes, did you consider using capacitors instead of Li batteries? There's some 2.7v 3000F super capacitors available nowadays, about 5 of those would get you 13.5v & 15000F.
88sins wrote:gonna be a pricey setup
88sins wrote:caps will be more like 4.1ah, and the small ups batteries are about 7-8ah. but the advantage of the caps is that they will recharge faster, supply more power more steadily, and have a better lifespan and deeper discharge rate than the Pb acid battery.
edit
going to be lighter to, as well as more efficient and cheaper in the long run.
X_Factor wrote:Are those cells being shipped to trinidad?
adnj wrote:Actually, current supercapacitors have an energy density of 2% to 10% of LiIon batteries and about 8% to 40% of lead acid. They also have voltage/current supply curves that are similar to LiIon .88sins wrote:caps will be more like 4.1ah, and the small ups batteries are about 7-8ah. but the advantage of the caps is that they will recharge faster, supply more power more steadily, and have a better lifespan and deeper discharge rate than the Pb acid battery.
edit
going to be lighter to, as well as more efficient and cheaper in the long run.
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