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I've had good luck with this seller. I purchased 1/4x1 for bus bars. https://www.ebay.com/str/stonerstoolsandrawmaterials

Any updates from real world user experience?

@gehowi When did you purchase these cells from BLS? I just purchased 8 of the 150Ah from them and the listing states August 2019 date of manufacture. I really appreciate you sharing the M4 vs M6 details. My cells get delivered in two days so I'm excited to see which shows up. Second question...

As most are aware aluminum is a good conductor (what a lot of wire uses these days) and it's very easy to work with. Why not buy some 1/4"×1" bar stock at ace or home depot and use it for the battery interconnect buss bar? I'd slot the holes a little for thermal expansion. My guess is that the...

Can you buy completed boards? All I see is the bill of materials on the github. Thanks for sharing.

From what I have read, parralel before series so the parallel cells can equalize. Provides some safety and the ability to easily measure voltage. I am leaning towards this.. 2P4S

I ran my Magnum Dimensions 2000w inverter at full load for two hours off of this pack to stress test it and measure temperature on my connectors, crimps and wires. Batteries didn't raise more than 8F degrees. That's 130ish amps. I think you're under estimating them.

Add a battery to battery charger to your trailer. Check out the renogy branded ones that can also act as your MPPT controller. Less stuff to install and will protect your alternator. 150A isn't that large these days...

Grizzzman, have you tried this one? https://de.aliexpress.com/item/32849758905.html

I JUST installed a BP-220 last weekend doing it the wrong way! Time for a rewire. The directions that came with mine didn't show or mention this. The updated manual, linked above, was updated last week! Hot off press. Thanks for sharing!

Hello Everyone, I have been doing solar/lithium in vans for quite some time and am finally to a point where I am ready to dive into setting my house up to be self-sustaining. Here is my plan, in phases. I have been using an Emporia to monitor my energy usage. Luckily I am in the NW and have...

Huge following here....go read until your eyes are crossed! ;) https://secondlifestorage.com/forumdisplay.php?fid=31&page=4

If you're not charging it via the alternator then there is no need.

No worries, just wanted to look out for your safety. Cheers!

Read The Fookin Manual You two crack me up.

Help me understand why you are so insistent that your 200Ah cells are made be ETC even though ETC themselves cannot say they are and, from what I am reading, are stating they are not? I am sure BLS is using multiple factories to source their cells, which is clearly demonstrated by the diversity...

You're missing 5.5V! ;) Have you tried resetting it to default and re-setting it up? Is it Smart or not? Curious what you find....

Excellent project. I am impressed. A few questions if you don't mind. How does the X6 charger do if there is a load on the battery? Have you tried that? Is that ammo can plastic? Got a link? Which specific BT bms is that? Are you willing to share your excellent code work with the community...

Would you mind sharing the assembling instructions? Curious what they recommend.

Did you reach out to the vendor and show the pictures and get their input? May be a useless endeavor but I am curious what they said, if anything...

@LiCurious Can you tell me what the dimensions of the black cell holder are? I am curious how large a pack like the one on their website would be.

I am using the Deligreen active balancer, it does very well. The top left is the Victron 120v charger. The other is the Victron Battery protect and MPPT. Theres a BMV-712 shunt in there too. Its under the dinette seat in my van. Tight space but works.

As you indicated, most people tend to think 4P2S and 2P4S are the same but they're quite different electrically. I personally think it comes down to the single fact that in a 2P4S build your cells will stay better balanced under charge and discharge in relation to each other. The 2 in parallel...

Do you have an implementation of (d) to show? I am having a hard time wrapping my head around how you do the green lines with a single 4s bms. Link or otherwise is fine. Thanks!

Super interesting thread @Maast !! I look forward to seeing your results. Any idea when you will be in a position to share the data and experience?

I'm happy with mine! The 150Ah come from a different cell manufacturer than the ones gehowi received.