Search
Search titles only
By:
Search titles only
By:
Forums
New posts
Search forums
What's new
New posts
Latest activity
Feedback
View Statistics
Members
Current visitors
Buy Sell Trade
WTB
Log in
Register
Search
Search titles only
By:
Search titles only
By:
New posts
Search forums
Menu
Install the app
Install
Reply to thread
Forums
Technology
Consumer Electronics
Looking for a home UPS that is smart
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Message
<blockquote data-quote="adder" data-source="post: 2191834" data-attributes="member: 12693"><p>Yes, I think we should have more people to get prices down, also in larger quantities we have option for high AH capacity cells. currently they refuse to import large capacity cells because of low quantity of my order. I will let you know a couple months in advance.</p><p></p><p>Cheapest method is using cyclindrical cells 32650 size of max capacity 6ah, but we need lots of bms, even then we can balance a group of say 4 batteries in parallel and about 16 cells in series at a time. So for 64 cells 51.2v nominal (equal to 48v 24ah lead battery) we need 1 bms. Some people go as high as 10 batteries in parallel, theory is they balance each other out but I am not confident to go beyond 4 to 6 cells in parallel which is the norm in cordless power tools or ev scooters.</p><p></p><p>But if we get a prismatic cell with a hard case, then we can get sizes of 20ah,40,60,80,100ah so we need only 1 bms to get the job done if we say go for a 100ah ones.albeit these high capacity bms is expensive about 15k for a good one rated at 100a or more continous and have their own screen for settings and info or by bluetooth data. Some even go for dumb bms which also works surprisingly well they just bleed the excess current by a resistor vs a active bms which can take power from overcharged cell and give it to undercharged cell.</p><p>These prismatic cells are more expensive but have higher cycle life then chinese cylindrical ones but both cheap chinese cells will outlast lead acid by atleast 3 times. Sony cyclidrical lfp cells last as high as 8000cycles and still have 80% life left. You sometimes see used sony LFP cells in ebay and they always outbid you by many times over because they are that good.</p></blockquote><p></p>
[QUOTE="adder, post: 2191834, member: 12693"] Yes, I think we should have more people to get prices down, also in larger quantities we have option for high AH capacity cells. currently they refuse to import large capacity cells because of low quantity of my order. I will let you know a couple months in advance. Cheapest method is using cyclindrical cells 32650 size of max capacity 6ah, but we need lots of bms, even then we can balance a group of say 4 batteries in parallel and about 16 cells in series at a time. So for 64 cells 51.2v nominal (equal to 48v 24ah lead battery) we need 1 bms. Some people go as high as 10 batteries in parallel, theory is they balance each other out but I am not confident to go beyond 4 to 6 cells in parallel which is the norm in cordless power tools or ev scooters. But if we get a prismatic cell with a hard case, then we can get sizes of 20ah,40,60,80,100ah so we need only 1 bms to get the job done if we say go for a 100ah ones.albeit these high capacity bms is expensive about 15k for a good one rated at 100a or more continous and have their own screen for settings and info or by bluetooth data. Some even go for dumb bms which also works surprisingly well they just bleed the excess current by a resistor vs a active bms which can take power from overcharged cell and give it to undercharged cell. These prismatic cells are more expensive but have higher cycle life then chinese cylindrical ones but both cheap chinese cells will outlast lead acid by atleast 3 times. Sony cyclidrical lfp cells last as high as 8000cycles and still have 80% life left. You sometimes see used sony LFP cells in ebay and they always outbid you by many times over because they are that good. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Technology
Consumer Electronics
Looking for a home UPS that is smart
Top
Bottom