Engineer34 said:

Please visit our website for more information on this topic.

I was also curious about the economical view of as well. These prismatic batteries promise like -cycles.
But how many cycles can salvaged from batteries can offer ?

I checked some new has 500 cycle life, can not imagine salvaged cells cycle life. If so why everybody use ?
It should be 4 times cheaper then prismatic new cells. Right ? Can anybody give some figures in order me to understand ?

Click to expand...

(lithium-ion) can definitely last longer than 500days in a solar DIY system... but I agree its a question of how long that is interesting to me.
Here's a thread by @Generic -

There's also the famous Battery University page -

One thing about (s) is that they are 'many small units' (as apposed to a prismatics bank that would likely be fewer/larger units) and it might be that as my battery bank ages it will die in groups of cells here and there rather than 1,000(s) of cells all at once - so I may have a chance to extend the life by ongoing cell maintenance... which is why I designed my packs to be serviceable.

(lithium-ion) can definitely last longer than 500days in a solar DIY system... but I agree its a question of how long that is interesting to me.Here's a thread by @Generic - https://secondlifestorage.com/showthread.php?tid= - whose's cycling some s @ 100% DOD to see what happens - he's reached the 1,200cycle mark recently and a couple of the cells still have 75% of the starting capacity.There's also the famous Battery University page - https://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries - showing that 1,000(s) of cycles are possible at low DOD %(s). My oldest 14s120p battery is now 2yrs old with 603 cycles at average DOD of 44%and going strong. ButI need 7,000 cycles to break even, so it will be a while yet before I have serious data....One thing about (s) is that they are 'many small units' (as apposed to a prismatics bank that would likely be fewer/larger units) and it might be that as my battery bank ages it will die in groups of cells here and there rather than 1,000(s) of cells all at once - so I may have a chance to extend the life by ongoing cell maintenance... which is why I designed my packs to be serviceable.

There is a long thread, link in my sig, It appears they have pulled their ads out of Amazon.ca I haven't checked on amazon.com. I have some electronics background and when I saw the BMS I immediately knew I had to get that out of there, my 3 year old could have done a better job. Ugh, don't wanna think about it.Please goto Amazon and REVIEW your issue with the blown BMS & two leaking sells. (photo's too) and I think they may be more inclined to resolve the issue, they did refund me $300 USD for their screw up which barely covered the cost of the repairs.You can swap out cells BUT you'll need to match then up and that may be a challenge to get. MIne are AYOUPOWER 174AH which they discontinued (no longer listed on their site) and the closest they have is 180AH now and don't retail. You'll need to find out what the cells are by locating all the markings and searching them out on the web, QR codes "may" be helpful.I'm prepping to building two more packs with Deligreens CATL 200AH cells, 2x 24v/200AH packs of 8 cells in series with BMS8T bms. Unfortunately the Chinese New Year shutdown tossed a wrench into those plans for the moment.

There is a long thread, link in my sig, It appears they have pulled their ads out of Amazon.ca I haven't checked on amazon.com. I have some electronics background and when I saw the BMS I immediately knew I had to get that out of there, my 3 year old could have done a better job. Ugh, don't wanna think about it.Please goto Amazon and REVIEW your issue with the blown BMS & two leaking sells. (photo's too) and I think they may be more inclined to resolve the issue, they did refund me $300 USD for their screw up which barely covered the cost of the repairs.You can swap out cells BUT you'll need to match then up and that may be a challenge to get. MIne are AYOUPOWER 174AH which they discontinued (no longer listed on their site) and the closest they have is 180AH now and don't retail. You'll need to find out what the cells are by locating all the markings and searching them out on the web, QR codes "may" be helpful.I'm prepping to building two more packs with Deligreens CATL 200AH cells, 2x 24v/200AH packs of 8 cells in series with BMS8T bms. Unfortunately the Chinese New Year shutdown tossed a wrench into those plans for the moment.

That guy was smart. I did not realize the necessity of doing that. Now the damage is done. It may be worth replacing just those two cells. I need to ponder that seriously since Shunbin may not honor the warranty.

Our story

Our batteries are true "A" grade and shipped to you directly from the Sinopoly factory.

Our batteries are true "A" grade and shipped to you directly from the Sinopoly factory.

They are not "B" grade batteries re-marketed as "A" through Alibaba or other Chinese platforms for sale to the United States and Europe.

 

Our batteries are true "A" grade and shipped to you directly from the Sinopoly factory.

L

Why is it impossible to buy grade-A LiFePO4 cells?

I'd like to introduce myself, explain a bit about the Lithium market, and why you should buy your batteries from Sinopoly USA.

My name is Alex Dorsey. In I set off on a journey to sail the world and I'm still at it. I single-handed across the Pacific in on a 28' sailboat. Now, nearly twenty years later, I'm still sailing the world but with my wife Carla (Argentina) and our two rescue dogs Nacho and Chewie (www.projectbluesphere.com). 

In mid I became interested in LiFePo4 batteries. As we live full-time off of our solar energy system, the upgrade to LiFePO4 was a practical and logical step. I knew finding a good source of LiFePO4 cells was key. After six months of research, I decided on an Alibaba supplier that was "verified" and purchased my sixteen A-quality (paid more for A) 200ah cells under the "Trade Assurance" program. I did everything right, or at least I thought I did?

Well, after receiving my cells nearly two months later, I tested them thoroughly and was more than unhappy with the results. Testing large capacity cells is a long and arduous process that most people do not do. Two of my cells were unusable and the supplier was compelled to replace them, which he did. I was now the proud owner of 18 B quality cells which the "trade assurance" program would not right three and a half months after placing my order. They worked well enough but I had to adjust my charging profile and I know I won't get the lifespan from them that was advertised by the manufacturer. 

Now, that being said, there is absolute value to grade-B cells and/or purchasing used cells. My grade-B LiFePO4 battery bank far outperforms any other battery technology I've had in my 31 years of sailing, and I have had them all. Grade B just isn't what I wanted or paid for. I expected my hard-earned investment to last 12+ years, which I know it will not. 

Goto sinopoly to know more.

I was determined to get answers. Why is is so hard for Americans and Europeans to buy A-quality LiFePO4 cells? The answer is long and complicated but you have to understand how the industry works, what the laws are in China, shipping regulations for lithium, and understand the United States trade war with China. 

Firstly, every A-quality cell that is produced is already sold. The world is desperately trying to fight global warming and move to clean energy solutions. That means lithium powered electric vehicles, and utility scale lithium storage solutions. The truth is the industry is working at capacity and factories are not focused on B2C business (you and me). 

Secondly, anywhere between 3-12% of a manufacturing run of cells are considered B as some factories have very high quality requirements. It is illegal for a Chinese manufacturer to export B-quality cells abroad, they must be sold very cheaply to the Chinese people, who in turn sell them on Alibaba and other platforms to the world market. Other people buy them in bulk and they end up on Amazon and eBay, and others build them into off-brand battery packs. This is why everyone keeps getting sub-par and bloated cells, and cells that just don't last that long. 

As far as shipping costs, you must also realize a few things. Due to Covid, the cost of a shipping container has soared from about $1,500 to nearly $8,000 in the last year.

 

You must also understand that there is a 25% trade war tariff on importing these batteries into the United States aside from the normal 2.5% import tax. So if you buy $10,000 in cells you will have to pay $2,750 in import duty to the United States not including shipping, insurance, special lithium handling, or storage. 

If you do a little research, and please do, you will be surprised as to all the costs and safety regulations, and how difficult it is to buy true grade-A LiFePO4 battery cells.

Well, I was determined to find a way. I spent eight months communicating with various Chinese factories and making contacts. The Lithium market is like the old west gold rush. Everyone is fighting to position themselves in the stream in the most profitable way. Despite all the competition, I ended up making a few good friends along the way and forged a solid relationship with Sinopoly. Sinopoly is one of the largest and oldest producers of LiFePO4 cells in the industry. Really a great group of people that are not only dedicated to producing the highest quality batteries, but have deep environmental roots as well. 

This is how sinopolyusa.com, and sinopolyeu.com were born. 

After eight months of negotiating, I was able to slice a small piece of a very large pie for the DIY LiFePO4 community. 

What I can promise you is access to true A-quality LiFePO4 battery cells direct from the Sinopoly factory at a fair price. During the first few months of my business, I will be shipping directly from the Sinopoly factory in China, but I'll be warehousing my stock in Canada & Italy for distribution to the Americas & Europe. 

My intention is to sell to the B2C community however my main focus is B2B operations and helping others set up their own business around the world as I am approved to offer wholesale pricing from Sinopoly.

If you have any questions please feel free to reach out to us. 

Peace.

With competitive price and timely delivery, sinopoly sincerely hope to be your supplier and partner.

Sail far and live slowly.

- Alex

Sinopoly 500ah Cells

Seawalker said:

That guy was smart. I did not realize the necessity of doing that. Now the damage is done. It may be worth replacing just those two cells. I need to ponder that seriously since Shunbin may not honor the warranty.

Click to expand...

There is a long thread, link in my sig, It appears they have pulled their ads out of Amazon.ca I haven't checked on amazon.com. I have some electronics background and when I saw the BMS I immediately knew I had to get that out of there, my 3 year old could have done a better job. Ugh, don't wanna think about it.

Please goto Amazon and REVIEW your issue with the blown BMS & two leaking sells. (photo's too) and I think they may be more inclined to resolve the issue, they did refund me $300 USD for their screw up which barely covered the cost of the repairs.

You can swap out cells BUT you'll need to match then up and that may be a challenge to get. MIne are AYOUPOWER 174AH which they discontinued (no longer listed on their site) and the closest they have is 180AH now and don't retail. You'll need to find out what the cells are by locating all the markings and searching them out on the web, QR codes "may" be helpful.

I'm prepping to building two more packs with Deligreens CATL 200AH cells, 2x 24v/200AH packs of 8 cells in series with BMS8T bms. Unfortunately the Chinese New Year shutdown tossed a wrench into those plans for the moment.

There is a long thread, link in my sig, It appears they have pulled their ads out of Amazon.ca I haven't checked on amazon.com. I have some electronics background and when I saw the BMS I immediately knew I had to get that out of there, my 3 year old could have done a better job. Ugh, don't wanna think about it.Please goto Amazon and REVIEW your issue with the blown BMS & two leaking sells. (photo's too) and I think they may be more inclined to resolve the issue, they did refund me $300 USD for their screw up which barely covered the cost of the repairs.You can swap out cells BUT you'll need to match then up and that may be a challenge to get. MIne are AYOUPOWER 174AH which they discontinued (no longer listed on their site) and the closest they have is 180AH now and don't retail. You'll need to find out what the cells are by locating all the markings and searching them out on the web, QR codes "may" be helpful.I'm prepping to building two more packs with Deligreens CATL 200AH cells, 2x 24v/200AH packs of 8 cells in series with BMS8T bms. Unfortunately the Chinese New Year shutdown tossed a wrench into those plans for the moment.

There is a long thread, link in my sig, It appears they have pulled their ads out of Amazon.ca I haven't checked on amazon.com. I have some electronics background and when I saw the BMS I immediately knew I had to get that out of there, my 3 year old could have done a better job. Ugh, don't wanna think about it.Please goto Amazon and REVIEW your issue with the blown BMS & two leaking sells. (photo's too) and I think they may be more inclined to resolve the issue, they did refund me $300 USD for their screw up which barely covered the cost of the repairs.You can swap out cells BUT you'll need to match then up and that may be a challenge to get. MIne are AYOUPOWER 174AH which they discontinued (no longer listed on their site) and the closest they have is 180AH now and don't retail. You'll need to find out what the cells are by locating all the markings and searching them out on the web, QR codes "may" be helpful.I'm prepping to building two more packs with Deligreens CATL 200AH cells, 2x 24v/200AH packs of 8 cells in series with BMS8T bms. Unfortunately the Chinese New Year shutdown tossed a wrench into those plans for the moment.

Our story

Our story

Our batteries are true "A" grade and shipped to you directly from the Sinopoly factory.

Our batteries are true "A" grade and shipped to you directly from the Sinopoly factory.

They are not "B" grade batteries re-marketed as "A" through Alibaba or other Chinese platforms for sale to the United States and Europe.

 

Our batteries are true "A" grade and shipped to you directly from the Sinopoly factory.

L

Why is it impossible to buy grade-A LiFePO4 cells?

I'd like to introduce myself, explain a bit about the Lithium market, and why you should buy your batteries from Sinopoly USA.

My name is Alex Dorsey. In I set off on a journey to sail the world and I'm still at it. I single-handed across the Pacific in on a 28' sailboat. Now, nearly twenty years later, I'm still sailing the world but with my wife Carla (Argentina) and our two rescue dogs Nacho and Chewie (www.projectbluesphere.com). 

In mid I became interested in LiFePo4 batteries. As we live full-time off of our solar energy system, the upgrade to LiFePO4 was a practical and logical step. I knew finding a good source of LiFePO4 cells was key. After six months of research, I decided on an Alibaba supplier that was "verified" and purchased my sixteen A-quality (paid more for A) 200ah cells under the "Trade Assurance" program. I did everything right, or at least I thought I did?

Well, after receiving my cells nearly two months later, I tested them thoroughly and was more than unhappy with the results. Testing large capacity cells is a long and arduous process that most people do not do. Two of my cells were unusable and the supplier was compelled to replace them, which he did. I was now the proud owner of 18 B quality cells which the "trade assurance" program would not right three and a half months after placing my order. They worked well enough but I had to adjust my charging profile and I know I won't get the lifespan from them that was advertised by the manufacturer. 

Now, that being said, there is absolute value to grade-B cells and/or purchasing used cells. My grade-B LiFePO4 battery bank far outperforms any other battery technology I've had in my 31 years of sailing, and I have had them all. Grade B just isn't what I wanted or paid for. I expected my hard-earned investment to last 12+ years, which I know it will not. 

I was determined to get answers. Why is is so hard for Americans and Europeans to buy A-quality LiFePO4 cells? The answer is long and complicated but you have to understand how the industry works, what the laws are in China, shipping regulations for lithium, and understand the United States trade war with China. 

Firstly, every A-quality cell that is produced is already sold. The world is desperately trying to fight global warming and move to clean energy solutions. That means lithium powered electric vehicles, and utility scale lithium storage solutions. The truth is the industry is working at capacity and factories are not focused on B2C business (you and me). 

Secondly, anywhere between 3-12% of a manufacturing run of cells are considered B as some factories have very high quality requirements. It is illegal for a Chinese manufacturer to export B-quality cells abroad, they must be sold very cheaply to the Chinese people, who in turn sell them on Alibaba and other platforms to the world market. Other people buy them in bulk and they end up on Amazon and eBay, and others build them into off-brand battery packs. This is why everyone keeps getting sub-par and bloated cells, and cells that just don't last that long. 

As far as shipping costs, you must also realize a few things. Due to Covid, the cost of a shipping container has soared from about $1,500 to nearly $8,000 in the last year.

 

You must also understand that there is a 25% trade war tariff on importing these batteries into the United States aside from the normal 2.5% import tax. So if you buy $10,000 in cells you will have to pay $2,750 in import duty to the United States not including shipping, insurance, special lithium handling, or storage. 

If you do a little research, and please do, you will be surprised as to all the costs and safety regulations, and how difficult it is to buy true grade-A LiFePO4 battery cells.

Well, I was determined to find a way. I spent eight months communicating with various Chinese factories and making contacts. The Lithium market is like the old west gold rush. Everyone is fighting to position themselves in the stream in the most profitable way. Despite all the competition, I ended up making a few good friends along the way and forged a solid relationship with Sinopoly. Sinopoly is one of the largest and oldest producers of LiFePO4 cells in the industry. Really a great group of people that are not only dedicated to producing the highest quality batteries, but have deep environmental roots as well. 

This is how sinopolysinopolyusa.com, and sinopolyeu.com were born. 

After eight months of negotiating, I was able to slice a small piece of a very large pie for the DIY LiFePO4 community. 

What I can promise you is access to true A-quality LiFePO4 battery cells direct from the Sinopoly factory at a fair price. During the first few months of my business, I will be shipping directly from the Sinopoly factory in China, but I'll be warehousing my stock in Canada & Italy for distribution to the Americas & Europe. 

My intention is to sell to the B2C community however my main focus is B2B operations and helping others set up their own business around the world as I am approved to offer wholesale pricing from Sinopoly.

If you have any questions please feel free to reach out to us. 

Peace.

Sail far and live slowly.

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BYD , CATL & Sinopoly , Winston LFE Cells

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