LiFePO4 storage |
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SamV
Old Croc Joined: 21 October 2008 Location: London Status: Offline Points: 8707 |
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Posted: 28 October 2021 at 12:37am |
Oof sorry to hear that matey. Hope things improve swiftly where possible.
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slaz
Old Croc Joined: 27 November 2009 Location: London E2 Status: Offline Points: 2713 |
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You mean last battery running = winner ? Yeah would be pretty cool - but not so much in English winter !
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REMEMBER....POLITICIANS AND DIAPERS SHOULD BE CHANGED OFTEN AND FOR THE SAME REASON
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slaz
Old Croc Joined: 27 November 2009 Location: London E2 Status: Offline Points: 2713 |
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Hey Sam .... Yeah I'd be interested in that some time .... but I now have some serious medical sh*t going on , so anything sound system has to be shelved for now TBH. Thanks for the offer ..... we should have a natter/meet up some time anyway.
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REMEMBER....POLITICIANS AND DIAPERS SHOULD BE CHANGED OFTEN AND FOR THE SAME REASON
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bitSmasher
Old Croc Joined: 23 June 2012 Location: Melbourne Status: Offline Points: 2296 |
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"Capacity Test" = 12V soundclash?
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https://www.instagram.com/batteryacidsoundsystem/
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SamV
Old Croc Joined: 21 October 2008 Location: London Status: Offline Points: 8707 |
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Nice! Do shout if you want the battery capacity tested, I'm still over in Limehouse :)
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slaz
Old Croc Joined: 27 November 2009 Location: London E2 Status: Offline Points: 2713 |
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Yeah - but I went for the ready-built battery - Ultramax brand. These (I have 2) are rated 50Ah each, but I haven't done any kind of capacity testing - other than playing em through the Pioneer amp. All I can say right now is they certainly seem to perform - better than I expected. I played at a wake up in Springfield Park (Clapton) the other night - just using 2 bridged channels of the amp into a single FBT 4R 12" box - ran it hard for about 4.5 hours, and it still needed quite a bit of discharging to get it down to 3.2V/cell :-) That was a _wicked_ do BTW - 2 DJ's doing their thang with Apple laptops and those ridiculously large DJ controller things - plenty of mic action etc. I was using my 2nd battery to power one of the Apple laptops via a cheapie inverter too ! The Pioneer amp - well I rate it pretty highly. Sounds clean to me - plenty of guts in it and well behaved. The top part of the casing is the chassis basically - the o/p devices are bolted to it. The only downside (for me) is that its a bit on the heavy side because of that die-cast chassis .... OTOH I think I'd prefer that to relying on some active cooling with a naff little fan somewhere. The case was luke warm after running 2 channels hard for several hours. Overall I'd recommend it ....
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REMEMBER....POLITICIANS AND DIAPERS SHOULD BE CHANGED OFTEN AND FOR THE SAME REASON
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carlosdelondres
Registered User Joined: 21 June 2012 Location: London Status: Offline Points: 243 |
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Ah 1200AH at 3.2V, thought you were building a traction pack :)
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SamV
Old Croc Joined: 21 October 2008 Location: London Status: Offline Points: 8707 |
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Mine is going to be a standard 12v affair, using Eve cells, I think 305ah iirc.
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carlosdelondres
Registered User Joined: 21 June 2012 Location: London Status: Offline Points: 243 |
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The narrowboat project sounds interesting, I built a 62V li-ion 1200Ah lithium battery for our barge last winter, super happy with the performance 6 months down the line - what cells are you using?
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SamV
Old Croc Joined: 21 October 2008 Location: London Status: Offline Points: 8707 |
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You can get BMS with various means to output data.
Anyways Studio45 is right, 3.2v (per sec) is the standard storage voltage for lifep04. I'd be curious to test their actual capacity, have you done so? I have one of those 15a capacity testors. I've recently purchased a 120ah of lifep04 cos it was cheap and I'm getting 104ah which is still fantastic for the price, but I'm about to order 1200ah of grade a cells and JBD BMS' to build a battery bank for a friends narrowboat :) I'd be curious to know what you think of that amp? Edited by SamV - 06 September 2021 at 6:50pm |
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slaz
Old Croc Joined: 27 November 2009 Location: London E2 Status: Offline Points: 2713 |
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Yeah OK .... well I couldn't really see any other way to assess SOC. Actually you'd think a USB port as a means of querying the BMS wouldn't be beyond the wit of man - eh ? Can't see it would cost more than loose change to implement.
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REMEMBER....POLITICIANS AND DIAPERS SHOULD BE CHANGED OFTEN AND FOR THE SAME REASON
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studio45
Old Croc Joined: 16 October 2007 Location: United Kingdom Status: Offline Points: 3863 |
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I think as long as the voltage is at about 3.2v, they are in the best state they can be for storage. It is basically impossible to determine SOC from voltage though as you say. So if you wanted to be sure, you'd have to charge them up fully, then drain them through an Ah meter into a dummy load until you've taken 25Ah out of each battery. For thoroughness, you'd want to do a full-drain capacity test first to determine actual capacity. Depends how long you want to spend watching an Ah meter I suppose ;)
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Studio45 - Repairs & Building Commotion Soundsystem -Mobile PA
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