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I meant Top Balance.

Hey everyone, I finally got my Overkill BMS working right and charging, but notice this voltage difference between cells. Is this acceptable or should I top balance them again? The cells are Fortune 100 ah cells. Also I don't actively use the pack, will it lose capacity permanently over time if...

Yeah, and I knew better too. I was at HomeDepot earlier today and didn't think to buy some 10 gauge while there, I had some but gave it to someone that needed it. I may have something else, I need to look. Actually, I think I have some wire for house wiring that I could use too. Yeah, I...

Thanks everyone, I whipped up some new cables with some 12 AWG I had a spool of and some ring connectors, that bumped up the amperage to 5 A and the batteries are now past 3.1. I was going to use some 1 AWG cables I had, but the the ring connectors were too big and made contact with each other...

Ah. I wondered if it's the leads, I have bigger ones I can use. So is it important to get them all to 3.65? Or will 3.31 work?

I followed Will's video, the only issue I saw is that after 24 hours the amperage never rose above 1.4 Amps even thought I set it to 4 Amps. Also the voltage only increased .1V. This was using my bench power supply set at 3.65V.

Hello, I was wondering if anyone suggested a charger for top balancing my Fortune 100 Ah cells? I have a nice 4/15 Amp Victron for 12V and a bench power supply for electronics projects, I tried the Victron and realized it won't go below 12V. I tried the bench psu and set it for 4 Amps, it never...

Thanks for the suggesion, may buy one. I have a bench PSU and a Victron Blue Smart Charger (15 amp).

No, no capacity tester, do you suggest a specific one?

3 tested as 3.28 and one as 3.25 "3 tested as 3.28 and one as 3.25"

Hey guys, since my BMS is on a 30 day back order, what should I do with my cells that are at such a high state of charge? They have already sat for a week.

Hey everyone, I was curious, if I get around installing solar panels on my property, will they get damaged if I don't have them connected to anything? I ask because I may set up my 5 panels in the coming month, but I may take a few weeks after to connect them to a charge controller, batteries...

As for cable length, I don't know, 1ft to 2ft, just enough to mount it on a board directly above the pack. I assume once I convert to 24v the cable will be overkill for that system and totally reusable?

700 watts or less for now. The BMS 120 Amp continuous, with 200 amp surge I believe. The cells are 200 amp with a 600 amp pulse.

Well, I won't be using the full 1500 watts to power what I need, so does the rule still apply? My pack is 100 ah Fortune cells. The charger was suggested by Battleborn (they sell on their site), it has an app via Bluetooth. It has a bunch of settings like: Storage, ABS, Bulk, Normal, and...

OK, now that I figured out I don't know anything about LFP batteries, I'm going to go ahead and order an OverKill Solar 12v BMS so I can start using it, I will try to buy another pack in the coming month and a 24v BMS to make a 24v pack. I guess I will just start running it down to 50% then back...

Moving on... (Homer disappearing into hedge)

I looks like I was wrong, think I got the memory confused with my ham radio gear which is 13.8v. I emailed them too, so look more stupid. Nonetheless 3 tested as 3.28 and one as 3.25. I did ask them how they store them in their warehouse and why they ship at full charge instead of at the...

Oh joy. I'm using my cheap Klein multimeter testing each cell individually. I haven't bothered connecting them all together since I don't have my BMS yet. They arrived Friday.

Interesting. Yeah, that's a tough one, I don't have a ton of money to play around to figure it out. I received my at 3.8v, so fully charged from the Electric Car Part Company (Will's primary suggested Fortune cell dealer).

I wonder how the cell sellers store and or charge the cells...

Ah, I didn't know if some of these programmable BMSs can have other cutoff states than the obvious 10V cuttoff.

Ah, cool, good to know. So is your BMS set to cutoff at 50%?

One reason I ask is because that's what I have already. Also I feel more pressed to use it every day for my home office since Snoobler here on the forums just told me that LFP should not be used as emergency power systems because the batteries are not meant to sit at a high state of charge for...

Another question, if I put a 1500 watt inverter on a 12 V system but don't draw the full 1500 watts (probably more like 800 or less) from basic electronics like router, modem, laptops, and monitors, will that be too much? I figured a little under 600 watts in my home office for the stuff I use...

I mean I guess I could use it to power electronics on my office all the time and keep the all-in-one connected to AC for charging. But I would think that would kill the batteries a lot faster with all the charge cycles from every day all day use.

Lol! Well then why are so many people building systems like that, including Will? I mean is the only valid use of LFP batteries to use it in a golf cart or solar power system? I'm not being sarcastic or anything, you're just the only person I've ever seen say something like that. I mean I have a...

Hey everyone, I plan on making a 24 V Hand Truck system for backup power if our grid power goes out. I will eventually put a charge controller on it too to hook up to our panels. Anyway, I was wonder if it's good practice or safe to keep my LiFePO4 cells on an AC charge to keep them topped off...

OK, then it sounds like that Kaiweets may be a good option then. I don't see the point of measuring anything on the DC side since I will use the formulas to make sure I am within the margin.

OK, that helps, how many amps would work?

Wow it is difficult finding a decent clamp meter that does both AC/DC and has an inrush feature. The only one I can find that you can't find in stock in the Klein CL900 which is $150 or the CL450 which is $175. The Kaiweets brand only has one that fit that criteria and it's not in stock...

Interestin Interesting, on the Klein website you can compare and they had a PDF that compares them and the 390 does not have the inrush option.

So from what I can tell on the Klein site, only two models have the Inrush feature and none of the models suggested here are those two models. The CL450 and the CL900.

OK, so I have canceled 2 orders with Amazon now because people suggest meters that don't meassure inrush. So I for sure need the inrush capability to meassure the surge of the compressor motor on my refrigerator? I want to confirm before I click another order button. :-D

Ah, good to know. Ah, good to know, thanks for sharing. I just emailed them too to see what they suggest.