New Supplier for 280Ah cells: Shenzen Basen
- Thread starter Haugen
- Start date
The studs I got off eBay that was a mistake there is some on Amazon of you search tho.
I bought 1/8inch by 3/4 brass bar stock and made my own buss bars. They don't send enough to paralel unless you specificly ask for extra.
However untill I had my bars I used a roll of plumbers tape to paralel them all. It's not tape it's metal strapping with holes drilled every 3/4 inch or so and they fit the studs perfectly. Get a whole roll for like 2 bucks. I wouldn't use it for a load but it's fine for charging
hankcurt
Solar Enthusiast
Just so others are aware, this page explains the difference between copper and brass.
https://www.bluesea.com/resources/108/Electrical_Conductivity_of_Materials
Essentially, even though brass contains a lot of copper, it has much lower conductivity. They explain that it can be used, but the cross sectional area of brass required will be greater than copper for a given application.
https://www.bluesea.com/resources/108/Electrical_Conductivity_of_Materials
Essentially, even though brass contains a lot of copper, it has much lower conductivity. They explain that it can be used, but the cross sectional area of brass required will be greater than copper for a given application.
This stuff? Great idea.
Oatey 3/4 in. x 10 ft. 28-Gauge Galvanized Pipe Hanger Strap 33526 - The Home Depot
Oatey Metal Hanger Straps are available in a variety of lengths and offer a quick and inexpensive way to hang pipe from joists or rafters. Made of durable metal and galvanized steel, these hanger straps
www.homedepot.com
I assume both were actually ddp quotes, I suspect it depends entirely on your country though.While looking at my options for cells, I asked for a quote of
8 * Lishen 272AH 3.2V Cells
From Basen on Aliexpress:
DAP: 600 (8*75) USD = + 237USD for shipping
When I ask for a DDP quote, they quote me the same amount...
If I were to order DDP, should I assume I would have to also pay the VAT of my country + duty taxes?
Something doesn't seem to add up
Considering my VAT, that would leave only 117 USD for duty fees and shipping itself.
For a total of 80 lbs and 0.06 cubic meter.
Maybe I'm not well versed into how low cost shipping from China has become ?
If I recall correctly I think that they assume small packages escape tax, but that was people who were larger importers talking about the us.
Yea that's the stuff. I forgot to order double buss bars too and I had this laying around so I used it to paralel and top balance my 16 cells.This stuff? Great idea.
Oatey 3/4 in. x 10 ft. 28-Gauge Galvanized Pipe Hanger Strap 33526 - The Home Depot
Oatey Metal Hanger Straps are available in a variety of lengths and offer a quick and inexpensive way to hang pipe from joists or rafters. Made of durable metal and galvanized steel, these hanger strapswww.homedepot.com
I started load testing my cells today. So far that swollen cell isn't acting any differently then the others. It's been running my AC for 3 hours. I had wanted to see how long it would run the ac alone but it decided to turn cold and rainy today on me. My bedrooms about 40 degrees with the air con running ?. Il have to switch to a space heater soon
Acho_303
New Member
- Joined
- Nov 26, 2020
- Messages
- 220
What bms are you using?
Two overkill solars. Two 24v banks in series I'm looking at daly smart bms 16s 200amp. It just is a bit of a hassle having two different bms apps to keep switching between
Look like it will give birth to a small 40ah battery soon....! Sweet.. your first baby battery..??
If its rated for 280ah and it doesn't get 280ah during a capacity test, then they are not grade A, otherwise they are not 280ah batteries.
Maybe this info below can be added to the OP to save everyone time unless you want everyone to read almost 400 posts for 2+ hours - which people won't. So you will die a frail old man at you computer answering the same questions over and over, from noobs like me, for ever and ever, until the end of time, until you are old and grey like the guy in UP.
Well that got a little dark. I should sleep instead of posting this at 4am, but alas I cannot sleep.After waking up at 1am, eventually I started to read. I spent 2+ hours reading this thread. I skimmed some very long arguments about types of dielectric grease vs silver etc to prevent corrosion d/t dissimilar metals, but I read most of it. Read about galvanic corrosion in the marine environment if you are curious. Anyway, here is the summary, not my opinions, but rather a summary. I will add links later for my future reference. Pardon my phone voice to text typing/ grammar.
In the end, three people out of the 396 posts did capacity tests, and all 3 said they past. Average was in the 270s for a 280ah. I'm not sure that qualifies as grade A. Some people believe that the ah will increase over time (a few cycles) and depends on slow vs fast discharge. Will Prowse addresses this in his videos, and how if it says its rated for that amount, it better be that amount or more. For example Eve vs Lishen (with the square plastic surrounding the terminal)- advertises 272ah in their specs vs 280ah thst Eve advertises. So either these EVE cells are B or they are not 280ah. But overall you are not getting crap or 100ah cells
They all shipped well in good packaging
You want DDP pricing which includes tarrifs/taxes etc.
Fedex gets the packages off the boats and delivers to your door. Plan for a month or 2 depending on the port.
For $1400+ In the end 16 cells with better than 80% of the 280ah, and is around a 14kwh pack. So it costs about the same as a 5kwh bigbattery.com 48v battery. But you need a BMS and a wooden case to compress the batteries to prevent internal delamination in order to decrease degredation or bulging. So, it's 1/3rd the cost of a solid brand, but requires work.
You want grub screw posts that you can insert then the nut provides the clamping force not the twist of a normal screw/bolt. This way you also can't screw through the bottom on the posts. Use red lock tight for permanent blue for removable. They connection is made between the lug and top surface of the terminal. They are M6 1.0 thread, Minimum length is 20mm long, but 30mm will allow for a second nut to lock the 1st nut down and there is no reason not to have a taller post.
The consensus is to make your own bus bars, many people mentioned copper flat stock. I wonder about smashing a copper pipe in a vise to flatten like some lugs as a cheap alternative. Tho it seems like stress cracks could form and create heat/shorting. The included bars are better than some people have seen from other suppliers depends on your needs if you want to upgrade.
Personal recommendation:
FYI - Dielectric grease will decrease the amount of oxygen getting to the surfaces quite a bit thus decreasing corrosion. We always use at least about a teaspoon amount on boat terminals. Wipe some on the surfaces of the lug, posts, and terminals, and then after bolting down, put a glob over the terminals yo cover everything. After half a decade the posts will still be clean even with dead boat batteries and all the acid involved when they bring the boats back in dead. The residential house kind from home depot is cheaper but thinner and oozes off the posts just leaving a thin coat. The permatex brand is thicker and the glob stays where you put it. There is literature and why you don't use the colored auto battery terminal stuff, but I just always remembered use the clear/Permatex after reading it.
All references said these were EVE cells and many pages were about decoding EVE date codes. Also compared to lower ah Lishen cells. Basen also sells Lishen cells if you are interested. Although maybe Lishen lists thier real ah rating at 272 vs 280 to be fair vs EVE and thus they would be grade A if EVE had legit specs. Many believe these are high quality grade B, the best rejects.
Lishen vid -
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The 5kwh reference was just taking a 48v system/16 cells and the resulting kwh it would provide, so divide the 14kwh by 5kwh to get down to a comparable cost vs buying a common 5kwh package, or battery from bigbattery.com etc
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I've watched several videos on youtube now testing these cells that come in over 280.
I can't load test kine as one cell is bad so I can't get them charged fully it keeps kicking me out when all the other cells are at 3.35. and I don't trust it's capacity either. But they're sending me a new one.
I figured it would cost me $8k ish in battle borns, maybe not the best to compare but that's what I would have bought if not doing my own.
The time involved is a moot point when you figure most of us doing the diy route is because we enjoy doing it
I can't load test kine as one cell is bad so I can't get them charged fully it keeps kicking me out when all the other cells are at 3.35. and I don't trust it's capacity either. But they're sending me a new one.
I figured it would cost me $8k ish in battle borns, maybe not the best to compare but that's what I would have bought if not doing my own.
The time involved is a moot point when you figure most of us doing the diy route is because we enjoy doing it
Well I just put in a bid for 40 cells. The first project will be an off grid house I'm building for a customer. We will see if they make it worth my wild to keep buying from them. The Lishen are on sale so I may just get those that Will listed on a video, plus bigbattery.com uses them. Now to just find a deal on 8 BMSs to make a 48v 8battery 4s@ 12v x 8p = 28kwh system. If all works out well I know 3 people who want the same thing. Hoping to find the BMSs that fortune uses that Will mentions in the vid above.
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Rec recommends parallel packs with separate contractors. 1 pack goes down the rest continues. Now your going to say that gets expensive. Each pack adds about 200 bucks in slaves. Not much considering each pack is worth about 1800 bucks. Well worth protecting.
I have a setup from rec on the way to test and I'll report on it.
I have a setup from rec on the way to test and I'll report on it.
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