Icon Lithium

[mbrown55]

roypow charger

[Undisclosed]

It looks like they have a new 105 Ah performance model (S51105P) with a higher maximum discharge. I wonder if that addresses the concern that led to doing two 56Ah.

[mbrown55]

Yes, my dealer has that on order and will be replacing mine with it when it comes in.

[Undisclosed]

Originally Posted by ATrain

I am very interested in building my own DIY lithium pack with high quality bms system.

It looks a little intimidating at first, but I'm thinking I might be able to handle it. The issue is always the cost. It seems like a100ah 48v system will still run a bit over $2k unless I recycle Leaf (car) batteries. At that price it's almost worth just buying the premade ones... But without a teardown of those, who knows what they skimped on to get to that price.

I spoke with RoyPow and they said only a small number of their new S51105P batteries are being sent out to dealers for testing/validation. It will be a few months before they are more broadly available. They don’t sell direct so did not get a price but I’m suspecting it is closer to $2.5k-$3k.

I’m starting to consider building my own pack as well - although I’m not adventurous enough to go down the recycled leaf battery approach.

I have found what I believe to be the cells they are using in the new S51195P. Specs seem to match anyway and this is the same EVE model number LF105. There is at least one positive YouTube review on cells from this vendor.
https://basen.en.alibaba.com/product...y_lifepo4.html

Would still need to source case, BMS and charger but seems doable.

Interested to hear others thoughts. Is this a stupid idea for a novice?

[mbrown55]

Please keep us posted on what you learn. Lithium and smart batteries are a new thing for me, but fascinating and seems to be ever evolving with all that’s going on in the world with electric vehicles and battery technology in general.

[mbrown55]

Originally Posted by Undisclosed

I spoke with RoyPow and they said only a small number of their new S51105P batteries are being sent out to dealers for testing/validation. It will be a few months before they are more broadly available. They don’t sell direct so did not get a price but I’m suspecting it is closer to $2.5k-$3k.

I’m starting to consider building my own pack as well - although I’m not adventurous enough to go down the recycled leaf battery approach.

I have found what I believe to be the cells they are using in the new S51195P. Specs seem to match anyway and this is the same EVE model number LF105. There is at least one positive YouTube review on cells from this vendor.
https://basen.en.alibaba.com/product...y_lifepo4.html

Would still need to source case, BMS and charger but seems doable.

Interested to hear others thoughts. Is this a stupid idea for a novice?

\

So would you just combine these until you get to 51V (16) and then you would have a 105 Ah 51V pack? I assume you would need a BMS, do you have anything in mind for that? Depending on the enclosure this would be about half the price of a roypow system.

[Undisclosed]

Correct. 16 of these + BMS + Enclosure + Charger & maybe a meter of some sort. I haven’t figured out the BMS yet and I think it would be a key component as it needs to support the high discharge rates. That was my math as well - half the price.

I’ve talked to a couple dealers and they seemed to confirm what I heard from RoyPow. Nobody has them yet and no firm dates on when they will actually have stock. But I’m guessing it will still be before I would get these from China.

It does seem like a fun project. Still debating.

[ATrain]

Originally Posted by Undisclosed

Correct. 16 of these + BMS + Enclosure + Charger & maybe a meter of some sort. I haven’t figured out the BMS yet and I think it would be a key component as it needs to support the high discharge rates. That was my math as well - half the price.

I’ve talked to a couple dealers and they seemed to confirm what I heard from RoyPow. Nobody has them yet and no firm dates on when they will actually have stock. But I’m guessing it will still be before I would get these from China.

It does seem like a fun project. Still debating.

The BMS is what will make it worth it or not as a project, I think. My BIL initially mentioned $600 for a good BMS, but he's used to dealing with racing vehicles and teslas designs. I saw Will Prowse review a $70 one that has all the necessary and important features, but didn't see where to buy it. https://www.youtube.com/watch?v=im4ggvoni5M, but the question I think comes down to someone smarter than myself identifying a cheap, quality BMS with all the bells and whistles.