Recent content by Fish Freak

Thank you for the detailed reply Samsonite! JBD Bms are coming up often when people mention good bms, so I'll check that out in-depth. Will mentioned Pace, but I couldn't find any good info about them. That flexibility in 8s to 24s is pretty awesome too. I'll check out those AIMS chargers for...

I'll be running a 36v trolling motor that has the ability to be run in 24v (to save weight) as well, and in either mode, max draw won't exceed 60a continuous. 12v batteries are easy to swap around between 24v and 36v, although I'm considering making one 12s, 36v array and keeping it that way...

Thanks Skypower, for this little tidbit of critical info! Took quite a bit to find that seller, and their listing is bizarre; You're in the CNeel store, you select a bms, and then your buying option is Eel Battery, and they have a store! It's like you're in a Matrix Maze ;) !! Oh and no one is...

Hmm, you think that's a good thing, a SS relay vs a good ol' mechanical one? I've used neither so I do no know. I'd hope that newer = improved. Overkillsolar prices look fair too compared to paying aliexpress shipping? Forgive me for the basic question, but looking at wiring diagrams on...

Hey Hedges, Very interesting, that REC bms, I'll have to research it more. Seems like a big HD relay would be what engine starting would need, right? I've noticed that tiny jumpstarters can kick out massive amps compared to their capacity. That's crazy, 1,500A! Looks like some kinda pouch...

Can anyone mention the names of the real (alibaba) sellers for these BMS? I've noticed a BUNCH of sellers list them, but who's got the real McCoy? Do any of these have a shunt of sorts to determine the % charge fairly accurately?

My only concern is damaging the cells, because I don't really know how many amps starting will draw? My cells have a 2C discharge so my 100A module should only burst 200A. Don't many BMS handle that high amp? I've looked into putting a shunt inline, but didn't find a bms that could use shunt info...

Very nice Josh, and I like that 36v recommendation, with a challenge is making a container for the 12s 36v cells, or maybe I only need to make a splash shield for the BMS and the cells can be open? I'm using Frey cells that have top/bottom caps you can connect with 4 long all-thread rods and has...

Hey JBibler; Just following you here because I'm in the same boat as you, as in, trying to make a DIY LifePO4 cell pack work for marine/auto engine starting and charging from the alternator and am looking for a higher quality BMS overall. Bluetooth app on phone is important for me, have you...

You brought up a great point Tom, about balancing the 3 or 4 12.8v series modules between themselves? I've been using SLA batteries in series for 36v for eons, but never thought of balancing until now that I'm setting up LifePO4 modules to do the same thing? Can you recommend any good 12.8v...

Nice. Is that smashed 1/2" copper pipe and the braid with no soldier or dielectric grease in the joint?

How many hundred amp hours does that cell equate to? Does that jive with the performance you've gotten? I wanted to use prismatic LifePO4 cells because it seems they can handle more cycles than the lithium-ion cells I've compared them to, but that Chevy (volt?) battery, isn't that something like...

How's this project going Up North? You had time to unpack, test and balance them?

That is a real concern Dan, we've seen a few of those aluminum 6mm thread terminals strip out. Also look at the Fortune/Frey cells because they have many excellent ways to connect the cells and their terminals are strong. In applications with a lot of motion or even impact like boating this is key.

To add to what Ampster said, your second idea for 100Ah cells does add redundancy, but keep in mind a 16S BMS will treat the three 100Ah parallel pack as a single 300ah 3.2v cell, and in all reality it doesn't make much of a difference because that's what's going on inside a big cell anyways. If...