loserextrodinaire
New member
- Joined
- May 21, 2020
- Messages
- 4
Hey guys this is my second post on here. I've been drinking the 18650 koolaid the last few weeks eating up youtube content and i am building a ~400 cell powerwall that i want to integrate into a vanlife build that i am doing. The problems arise in that i bought this cheapish charge controller from ali express (https://www.aliexpress.com/item/400...fullPieceDiscountPromo_65854355.4000832946950)
And i'm wondering whether i should go 6s or 7s to make everything work right.
I am doing a 24v system because of the higher wattage solar panels available that i want to mount on my pre existing roof racks (it should be easy with the z brackets or bars.) My problems arise because i can't seem to find a good inexpensive inverter that will work with 24v nominal in actuality it's 4.1x7s=~28.7 volts. Ok i was going to buy this one: (https://www.amazon.com/LVYUAN-1500W...&keywords=24v+inverter&qid=1590080954&sr=8-11)
It says its good for 18-30v and yet it has a over voltage shutdown of 27.5 which obviously wouldn't work with 7s. So it would work with 6s apparently, but then would going with 6s cause problems with the charge controller? Ok it looks like i am better off going with 6s because the low voltage detect and float voltage are adjustable on the charge controller, and can be set for 6s's charging parameters. I also think 6s would allow me to use one of these 12v to 24v boost converters (https://www.amazon.com/Cllena-Conve...+24v+480v&qid=1590081886&s=electronics&sr=1-5)
And tie it directlyinto the charge controller off of a dc switch, to charge off the alternator.
I basically answered my own question here i think, but i would really appreciate peoples advice here as it seems more people recomend 7s vs 6s, and i was wondering what the down sides are for 6s.
Oh yeah and the cells that i got so far if anyone cares are the ones from batteryhookup with 20 cells for .17cents a cell. I've opened about 17 packs and most are the red sanyos from 2006 (sadface, but atleast they dont overheat like the first one i did that had the purple coller, those are legit heaters and the ones with the red on red are cool in comparison) Also there were 3 or 4 packs of the pink samsungs (they all test at 2000+ma, and are from 6 years ago) one pack with the lg's The red sanyos seem to be trash as the best ones test at 1500ma, and most are around 1000ma. I don't know definitevely as i have a knock off charge controller called the bc-3000 whitch doesnt seem to discharge consitently if that makes sense with the red sanyos, i don't know if the red sanyos are really that bad or if the charge controller is just junk. I've got a load of laptop batteries on the way so hopefully i will find some decent cells.
And i'm wondering whether i should go 6s or 7s to make everything work right.
I am doing a 24v system because of the higher wattage solar panels available that i want to mount on my pre existing roof racks (it should be easy with the z brackets or bars.) My problems arise because i can't seem to find a good inexpensive inverter that will work with 24v nominal in actuality it's 4.1x7s=~28.7 volts. Ok i was going to buy this one: (https://www.amazon.com/LVYUAN-1500W...&keywords=24v+inverter&qid=1590080954&sr=8-11)
It says its good for 18-30v and yet it has a over voltage shutdown of 27.5 which obviously wouldn't work with 7s. So it would work with 6s apparently, but then would going with 6s cause problems with the charge controller? Ok it looks like i am better off going with 6s because the low voltage detect and float voltage are adjustable on the charge controller, and can be set for 6s's charging parameters. I also think 6s would allow me to use one of these 12v to 24v boost converters (https://www.amazon.com/Cllena-Conve...+24v+480v&qid=1590081886&s=electronics&sr=1-5)
And tie it directlyinto the charge controller off of a dc switch, to charge off the alternator.
I basically answered my own question here i think, but i would really appreciate peoples advice here as it seems more people recomend 7s vs 6s, and i was wondering what the down sides are for 6s.
Oh yeah and the cells that i got so far if anyone cares are the ones from batteryhookup with 20 cells for .17cents a cell. I've opened about 17 packs and most are the red sanyos from 2006 (sadface, but atleast they dont overheat like the first one i did that had the purple coller, those are legit heaters and the ones with the red on red are cool in comparison) Also there were 3 or 4 packs of the pink samsungs (they all test at 2000+ma, and are from 6 years ago) one pack with the lg's The red sanyos seem to be trash as the best ones test at 1500ma, and most are around 1000ma. I don't know definitevely as i have a knock off charge controller called the bc-3000 whitch doesnt seem to discharge consitently if that makes sense with the red sanyos, i don't know if the red sanyos are really that bad or if the charge controller is just junk. I've got a load of laptop batteries on the way so hopefully i will find some decent cells.