Even my 6 month old cells with 80+ cycles still test better than that
Who is still building DIY batteries
- Thread starter JJJJ
- Start date
timselectric
If I can do it, you can do it.
- Joined
- Feb 5, 2022
- Messages
- 20,095
Mine too, a year old.
EastFalcon
New Member
Thanks for rubbing it in!
Steve_S
Offgrid Cabineer, N.E. Ontario, Canada
What JJJJ should have mentioned as it is not obvious, he ordered from Amy Wan @ Luyuan Technologies through Alibaba. Not to be confused by the other Amy's ...
Shenzhen Luyuan Technology Co., Ltd. - Lifepo4 battery, LTO battery
Shenzhen Luyuan Technology Co., Ltd., Experts in Manufacturing and Exporting Lifepo4 battery, LTO battery and 142 more Products.
szluyuan.en.alibaba.com
How can I get in contact with the real Jenny Wuu that everyone talks about and says she is great..
I am not a google or alibaba wiz, so I am afraid I would get duped by an imposter lol..
If I go to docan U.S. site in Texas Can I contact her that way?
Thank you for any help.. This newb will appreciate it..
I am not a google or alibaba wiz, so I am afraid I would get duped by an imposter lol..
If I go to docan U.S. site in Texas Can I contact her that way?
Thank you for any help.. This newb will appreciate it..
Use the link @Steve_S provided.
@Alkaline Would you have a link to that Eel V3 white box with the NEEy active balancer and 200A sepolos BMS V3 200A + Bluetooth?
I am interested in checking that out.
Thanks
Scat
Alkaline
Solar Wizard
I'll send the link but now I"m not so sure about it the EEL... Posts like this don't inspire confidence:
diysolarforum.com
Here is the v3 I ordered:
eelbattery.myshopify.com
$789 fully loaded with the heating and 200a and bluetooth.
EEL Experience
8 days later and my other BMS that "got lost" FORGOT has still not shipped. Turns out I did pay via Paypal so I have opened a dispute with them. I was going to get another 2 boxes as well to replace my plywood messes but unlikely to be from EEL now. Might as well play the ali-ripoff games.
diysolarforum.com
Here is the v3 I ordered:
EEL 48V V3 Server Rack Battery DIY BOX 4A Active Balancer Stackable Type
These kits feature a 48V 16S Smart BMS, supporting both CANBUS and RS485 communication for seamless integration. The stackable design allows for up to 14 batteries, perfect for expanding your home energy system. Each kit includes essential components such as a 200A fuse, active balancer, and LCD...
eelbattery.myshopify.com
$789 fully loaded with the heating and 200a and bluetooth.
I have this on order for 8s. I believe it is available in other configurations. Not sure if the display is on all of them.
www.alibaba.com
Luyuan Diy Battery Box/case Set/kit For 8s 4s2p 24v 280ah 304ah 320ah Battery Pack With With Compression Battery/cell Device - Buy Larger Box For Men,Seed Storage Metal Box,Car Waterproof 12v Battery Box Product on Alibaba.com
Luyuan Diy Battery Box/case Set/kit For 8s 4s2p 24v 280ah 304ah 320ah Battery Pack With With Compression Battery/cell Device - Buy Larger Box For Men,Seed Storage Metal Box,Car Waterproof 12v Battery Box Product on Alibaba.com
You mean $133/kWh right?34 Envision 304 B cells and 2 EEL battery boxes on their way ?
Just over $4000 for 30kwh of battery, $0.13 per kwh
Still insanely cheap, but not $0.13 haha.
Quattrohead
Solar Wizard
Maybe I meant 13 cents per watt hour LOL. Yeah dirt cheap regardless.
Thank youI'll send the link but now I"m not so sure about it the EEL... Posts like this don't inspire confidence:
EEL Experience
8 days later and my other BMS that "got lost" FORGOT has still not shipped. Turns out I did pay via Paypal so I have opened a dispute with them. I was going to get another 2 boxes as well to replace my plywood messes but unlikely to be from EEL now. Might as well play the ali-ripoff games.
Here is the v3 I ordered:
EEL 48V V3 Server Rack Battery DIY BOX 4A Active Balancer Stackable Type
These kits feature a 48V 16S Smart BMS, supporting both CANBUS and RS485 communication for seamless integration. The stackable design allows for up to 14 batteries, perfect for expanding your home energy system. Each kit includes essential components such as a 200A fuse, active balancer, and LCD...
$789 fully loaded with the heating and 200a and bluetooth.
send me a PM and I'll give you her gmail address. I've ordered from her recently, and very pleased.
MrM1
I'm Here, But I'm Not All There
Amy Zheng at Docan has also been very helpful to me. PM me and I can send you her gmail
Just got an update from Amy Wan @ Luyuan Technologies through Alibaba. The order is being shipped.
The entire process have been easy and low key. I have asked a number of questions over the past few months and she has been quick to reply. I was able to come and go as needed in the conversation and there was never any pressure to buy.
When I finally placed the order things went rather quickly on her end. There were some very nice touches which were a pleasant surprise. She included a link which had pictures of each item of my order inside each box and after they were assembled on a pallet and plastic wrapped. I also received a printout of the battery capacities which included detailed voltage and resistance ratings.
They match and batch the cells and they are listed as Automotive grade. These are Grade A and come directly from EVE.
There are only two cells per box with foam all around as expected. I had also purchased a battery box linked above and a BMS. The BMS was tucked nicely inside the battery box before being placed in another box for safe keeping.
There have been a number of very satisfied customers on this forum which prompted me to make the purchase.
I will be doing a show and tell once things arrive.
The entire process have been easy and low key. I have asked a number of questions over the past few months and she has been quick to reply. I was able to come and go as needed in the conversation and there was never any pressure to buy.
When I finally placed the order things went rather quickly on her end. There were some very nice touches which were a pleasant surprise. She included a link which had pictures of each item of my order inside each box and after they were assembled on a pallet and plastic wrapped. I also received a printout of the battery capacities which included detailed voltage and resistance ratings.
They match and batch the cells and they are listed as Automotive grade. These are Grade A and come directly from EVE.
There are only two cells per box with foam all around as expected. I had also purchased a battery box linked above and a BMS. The BMS was tucked nicely inside the battery box before being placed in another box for safe keeping.
There have been a number of very satisfied customers on this forum which prompted me to make the purchase.
I will be doing a show and tell once things arrive.
RV10flyer
Solar Wizard
- Joined
- Mar 8, 2021
- Messages
- 1,198
64 cells from Amy in the past, all doing great. I just prefer to deal with 18650 battery in Atlanta Georgia for faster shipping and one big pallet of 40 ea. Same good cells though.
Nobodybusiness
Solar Sponge.
Yup having stateside rep makes big difference.
Have you received this yet? Could you give us a review? I am looking for one for my 16s CATL 302 cells.
Dave911
Solar Enthusiast
Redodo has been selling 12 volt, 100ah RV style LIFEPO4 batteries recently at some low prices on Amazon and Ebay.
Just bought 4 of them for about $210 each with shipping.
1250 watt-hours per battery, so $210/1250 = 16.8 cents per watt-hour, assembled, with a BMS, and a 5 year warranty. Nothing to do other than charge them and hook them up. If one dies, I can pull it out and replace it and hopefully have it covered under warranty if it is less than 5 years old. The Redodo cells are made up of prismatic 100ah cells along with a BMS, stuck into an automotive style box. There is a lot of extra space in the box. There are some teardown videos on Youtube.
I looked at doing a DIY 48 volt battery but with the cost of BMS's, cells and shipping it didn't seem to make any sense.
Redodo says the built in BMS can support 4S4P without any issues.
I previously bought 4 Redodo batteries and they seem to be fairly high quality.
Together with the previously purchased 4 batteries I have about 10 kwhr of battery at 48 volts (4S2P) for about $1700. The first few I purchased were more expensive.
I've done electrical/electronic work for a long time, so hooking up DIY batteries would not be a problem, I just didn't see how it makes any sense right now.
The server rack batteries seem ok but if one dies, then what? Plus they are not cheap. If one fails I am out a lot of capacity. Do I setup a truck shipment to send it back for warranty? Do I tear it apart and try and replace the bad cell/s?
I doubt they were made to be user serviceable.
Anyway, tell me why I was wrong to purchase these Redodo batteries. I am seriously looking for honest criticism.
Is this the wrong way to go?
Depending on how my solar setup goes, I may be expanding this Redodo battery bank to 20 kwhr fairly soon. If this is the wrong direction, save me some money!
Thanks, Dave
Just bought 4 of them for about $210 each with shipping.
1250 watt-hours per battery, so $210/1250 = 16.8 cents per watt-hour, assembled, with a BMS, and a 5 year warranty. Nothing to do other than charge them and hook them up. If one dies, I can pull it out and replace it and hopefully have it covered under warranty if it is less than 5 years old. The Redodo cells are made up of prismatic 100ah cells along with a BMS, stuck into an automotive style box. There is a lot of extra space in the box. There are some teardown videos on Youtube.
I looked at doing a DIY 48 volt battery but with the cost of BMS's, cells and shipping it didn't seem to make any sense.
Redodo says the built in BMS can support 4S4P without any issues.
I previously bought 4 Redodo batteries and they seem to be fairly high quality.
Together with the previously purchased 4 batteries I have about 10 kwhr of battery at 48 volts (4S2P) for about $1700. The first few I purchased were more expensive.
I've done electrical/electronic work for a long time, so hooking up DIY batteries would not be a problem, I just didn't see how it makes any sense right now.
The server rack batteries seem ok but if one dies, then what? Plus they are not cheap. If one fails I am out a lot of capacity. Do I setup a truck shipment to send it back for warranty? Do I tear it apart and try and replace the bad cell/s?
I doubt they were made to be user serviceable.
Anyway, tell me why I was wrong to purchase these Redodo batteries. I am seriously looking for honest criticism.
Is this the wrong way to go?
Depending on how my solar setup goes, I may be expanding this Redodo battery bank to 20 kwhr fairly soon. If this is the wrong direction, save me some money!
Thanks, Dave
cs1234
Solar Wizard
- Joined
- May 9, 2022
- Messages
- 2,915
The general consensus is that you should get batteries that have the same voltage as your system.
Multiple BMS' making up a battery are going to have problems staying balanced in series and may exhibit odd behavior under heavy load / heavy charge.
I use some 12v lifepo4 batteries in series, but I don't push them hard.
Passive balancers in drop in batteries can cause hot spots on cells. A BMS you can't adjust and you have no way of knowing what's going on in side. Series wired cheap batteries like this are well know for causing balance issues. Charging them to high voltages, over 80% charged will likely be where you start to hit balance issues.Redodo has been selling 12 volt, 100ah RV style LIFEPO4 batteries recently at some low prices on Amazon and Ebay.
Just bought 4 of them for about $210 each with shipping.
1250 watt-hours per battery, so $210/1250 = 16.8 cents per watt-hour, assembled, with a BMS, and a 5 year warranty. Nothing to do other than charge them and hook them up. If one dies, I can pull it out and replace it and hopefully have it covered under warranty if it is less than 5 years old. The Redodo cells are made up of prismatic 100ah cells along with a BMS, stuck into an automotive style box. There is a lot of extra space in the box. There are some teardown videos on Youtube.
I looked at doing a DIY 48 volt battery but with the cost of BMS's, cells and shipping it didn't seem to make any sense.
Redodo says the built in BMS can support 4S4P without any issues.
I previously bought 4 Redodo batteries and they seem to be fairly high quality.
Together with the previously purchased 4 batteries I have about 10 kwhr of battery at 48 volts (4S2P) for about $1700. The first few I purchased were more expensive.
I've done electrical/electronic work for a long time, so hooking up DIY batteries would not be a problem, I just didn't see how it makes any sense right now.
The server rack batteries seem ok but if one dies, then what? Plus they are not cheap. If one fails I am out a lot of capacity. Do I setup a truck shipment to send it back for warranty? Do I tear it apart and try and replace the bad cell/s?
I doubt they were made to be user serviceable.
Anyway, tell me why I was wrong to purchase these Redodo batteries. I am seriously looking for honest criticism.
Is this the wrong way to go?
Depending on how my solar setup goes, I may be expanding this Redodo battery bank to 20 kwhr fairly soon. If this is the wrong direction, save me some money!
Thanks, Dave
I am building a 105Ah @24v battery for slightly more than your cost per Wh but I get grade A cells and a JK 200A BMS with 2A active balancer. Guess where I would rather be? I like building them. Its fun and easy
Dave911
Solar Enthusiast
Not having a single balancer that operates over all of the cells (48 volts) could be an issue. Redodo recommends rebalancing the batteries in a bank every 6 months. Redodo says they use Grade A cells, so we will see. I'm just going to do it and then check for balance periodically. That's pretty simple to do. TimE, are you factoring in some type of case around your cells as part of your build cost. I added up the costs to assemble a 48 volt battery with cells and a BMS and I could not get close to the Redodo cost. Where are you buying Grade A cells and a BMS that costs only slightly more than the Redodo cost of 16.8 cents per watt-hour? Are you buying cells with any type of warranty? If raw Grade A cells and a BMS was significantly cheaper than the Redodo's I would have gone that route. But everything I could find was significantly more expensive. I think the best was the B grade cells from 18650. And I'm not sure its smart to invest a bunch of $$ into B grade cells from what I have read.
timselectric
If I can do it, you can do it.
- Joined
- Feb 5, 2022
- Messages
- 20,095
16.9 cents per wh.
LF280K from 18650batterystore 16 at $2,304
JK B2A24S20P from AliExpress (JK BMS store) 1 at $125
No case (went commando)
LF280K from 18650batterystore 16 at $2,304
JK B2A24S20P from AliExpress (JK BMS store) 1 at $125
No case (went commando)
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