gimme_power Posted June 2, 2023 Share Posted June 2, 2023 Hi all, has anyone used, or have any opinions about this cell? It has a weird form factor, but at that price I can see myself building a battery that can sit on my shelf. https://altergrid.co.za/product/svolt-184ah-3-2v-lifepo4-blade-battery-cell/ Clint 1 Quote Link to comment Share on other sites More sharing options...
Froggy Posted June 5, 2023 Share Posted June 5, 2023 Hi, bought 16 for a 48v build....all the cells measure between 3,291 and 3.294 v. Very impressed with the build quality of the cells and the service from altergrid. I've not capacity rested yet but Bertus from altergrid tested them to 187ah at .2c... he'll send you the full test graph if u want. Scorp007 and gimme_power 2 Quote Link to comment Share on other sites More sharing options...
Froggy Posted June 5, 2023 Share Posted June 5, 2023 I think the form factor is ideal for wall mounting. Can be used similar to these BYD blade batteries. Would have been nice if the clips and buss-bars were available. Quote Link to comment Share on other sites More sharing options...
gimme_power Posted June 6, 2023 Author Share Posted June 6, 2023 I'd be very interested to see how you build this. I was thinking of buying 30 for a 2P15S battery, seeing I need to match my existing 15S batteries Quote Link to comment Share on other sites More sharing options...
NoordSolar Posted June 7, 2023 Share Posted June 7, 2023 I have bought 32 cells from Altergrid and have started testing with a Zketech battery capacity tester and a YR1035+ Internal resistance tester. IR are all between 0.48 and 0.52 mohm. Capacity for these cells is rated at 0.33 C from 3.65V to 2.0V I measured from 3.65V at 0.2C down to 2.8V and extrapolated from a single cell that was tested to 2.5V . ( This provided an additional 2.0 AH ) So I measured from 182 -184 AH to an effective 2.5V ( 7 cells tested so far ) . There are very nicely built with a high build quality Quote Link to comment Share on other sites More sharing options...
Clynton Posted June 7, 2023 Share Posted June 7, 2023 They are nice cells - 16 of them will give you a little over 9kwh's. BYD were the first with the Blade battery and now SVOLT are giving them a run. The IR is a little high but expected for a cell of this form factor, hence the slightly lower charge and discharge C-Rating. Although the documentation (tech spec sheet) does say you can discharge at a 1C rate. What's interesting is they say these cells can be discharged to 2.0V... I never discharge a LiFePo4 cell below 2.8V as this directly influences cycle life. Besides you'll only get maybe an extra 5 or 6 ah's from 2.8V down to 2.0V. Would love to be able to get those brackets and busbars as seen in the video above. Would make assembling and connectivity a pleasure. If put in a nicely designed cabinet, you could hang/mount them on the wall next to your inverter. Total dimensions would be approx, 620mm wide x 400mm high x 140mm deep - taking in to account the BMS, DC Breaker, a screen and power switch. Any way. update us once assembled, running and have cycled a few times. Quote Link to comment Share on other sites More sharing options...
NoordSolar Posted June 7, 2023 Share Posted June 7, 2023 I have heard that Altergrid is in the process of ordering a set of brackets and busbars. You can print them your self if you want , STP file provided here http://www.cleverbms.com/list_11/89.html Brushless, ibiza, LLawrence and 1 other 3 1 Quote Link to comment Share on other sites More sharing options...
NoordSolar Posted June 7, 2023 Share Posted June 7, 2023 The IR is rated at .45 mOhm for 184 AH cell or .81 per 100 AH , The EVE 280AH is 0.25mOhm so 0.7mOhm per 100AH , not far different 12 minutes ago, Clynton said: They are nice cells - 16 of them will give you a little over 9kwh's. BYD were the first with the Blade battery and now SVOLT are giving them a run. The IR is a little high but expected for a cell of this form factor, hence the slightly lower charge and discharge C-Rating. Although the documentation (tech spec sheet) does say you can discharge at a 1C rate. What's interesting is they say these cells can be discharged to 2.0V... I never discharge a LiFePo4 cell below 2.8V as this directly influences cycle life. Besides you'll only get maybe an extra 5 or 6 ah's from 2.8V down to 2.0V. Would love to be able to get those brackets and busbars as seen in the video above. Would make assembling and connectivity a pleasure. If put in a nicely designed cabinet, you could hang/mount them on the wall next to your inverter. Total dimensions would be approx, 620mm wide x 400mm high x 140mm deep - taking in to account the BMS, DC Breaker, a screen and power switch. Any way. update us once assembled, running and have cycled a few times. Quote Link to comment Share on other sites More sharing options...
PsyCLown Posted June 8, 2023 Share Posted June 8, 2023 Very nice price indeed, although specs only state 2500 cycles? Am I missing something? Quote Link to comment Share on other sites More sharing options...
NoordSolar Posted June 8, 2023 Share Posted June 8, 2023 Cycle life cannot really be tested as the test will take years , I doubt its actually tested probably thats the design life. When used for home energy storage calender aging will be the dominant lifetime ending factor and this is strongly dependant on temperature. Quote Link to comment Share on other sites More sharing options...
NoordSolar Posted June 8, 2023 Share Posted June 8, 2023 19 hours ago, Clynton said: They are nice cells - 16 of them will give you a little over 9kwh's. BYD were the first with the Blade battery and now SVOLT are giving them a run. The IR is a little high but expected for a cell of this form factor, hence the slightly lower charge and discharge C-Rating. Although the documentation (tech spec sheet) does say you can discharge at a 1C rate. What's interesting is they say these cells can be discharged to 2.0V... I never discharge a LiFePo4 cell below 2.8V as this directly influences cycle life. Besides you'll only get maybe an extra 5 or 6 ah's from 2.8V down to 2.0V. Would love to be able to get those brackets and busbars as seen in the video above. Would make assembling and connectivity a pleasure. If put in a nicely designed cabinet, you could hang/mount them on the wall next to your inverter. Total dimensions would be approx, 620mm wide x 400mm high x 140mm deep - taking in to account the BMS, DC Breaker, a screen and power switch. Any way. update us once assembled, running and have cycled a few times. HAve you come across a decently priced DC breaker with a 10 -20 KA+ fault current rating ? Quote Link to comment Share on other sites More sharing options...
Chris_S Posted June 8, 2023 Share Posted June 8, 2023 9 minutes ago, NoordSolar said: HAve you come across a decently priced DC breaker with a 10 -20 KA+ fault current rating ? I use these. Pretty large though https://e-glow.co.za/products/mccb-2p-600v-circuit-breaker?_pos=8&_sid=eae55b092&_ss=r Quote Link to comment Share on other sites More sharing options...
PsyCLown Posted June 8, 2023 Share Posted June 8, 2023 31 minutes ago, NoordSolar said: Cycle life cannot really be tested as the test will take years , I doubt its actually tested probably thats the design life. When used for home energy storage calender aging will be the dominant lifetime ending factor and this is strongly dependant on temperature. Fair enough, I guess even a full cycle per day would mean a lifespan is over 7 years. Quote Link to comment Share on other sites More sharing options...
NoordSolar Posted June 8, 2023 Share Posted June 8, 2023 51 minutes ago, Chris_S said: I use these. Pretty large though https://e-glow.co.za/products/mccb-2p-600v-circuit-breaker?_pos=8&_sid=eae55b092&_ss=r Well priced , somehow I cannot bring myself to buying Chinese breakers. CBI do a range now . Struggling to find supplier online Quote Link to comment Share on other sites More sharing options...
Chris_S Posted June 8, 2023 Share Posted June 8, 2023 3 hours ago, NoordSolar said: Well priced , somehow I cannot bring myself to buying Chinese breakers. CBI do a range now . Struggling to find supplier online Call CBI direct Quote Link to comment Share on other sites More sharing options...
DeonBez Posted June 8, 2023 Share Posted June 8, 2023 (edited) 4 hours ago, NoordSolar said: CBI do a range now . Struggling to find supplier online Just take note of this when looking at DC breakers as not all can be used for both charging and discharging: Edited June 8, 2023 by DeonBez Tim003 1 Quote Link to comment Share on other sites More sharing options...
NoordSolar Posted June 8, 2023 Share Posted June 8, 2023 20 minutes ago, DeonBez said: Just take note of this when looking at DC breakers as not all can be used for both charging and discharging: Thanks well spotted ! Quote Link to comment Share on other sites More sharing options...
Clynton Posted June 8, 2023 Share Posted June 8, 2023 9 hours ago, NoordSolar said: HAve you come across a decently priced DC breaker with a 10 -20 KA+ fault current rating ? I have used the TOMZN breakers quite a bit and haven't had any failures to date. I use the 125A smaller breaker (https://e-glow.co.za/collections/mcb-dc-circuit-breakers/products/125a-dc-1p-circuit-breaker-250v) on the 100AH cells on the positive with a 150A JKBMS for the 5KW batteries and the 200A bigger breaker (https://e-glow.co.za/collections/mcb-dc-circuit-breakers/products/mccb-1p-250v-circuit-breaker) on the 280AH cells with a 200A JKBMS for the 14KW batteries. JKBMS is on the negative side of the pack and I set the current protection accordingly within the software as added protection. I then use the 200A 2pole DC Breaker as extra safety and as an isolator on a Sunsynk 8Kw inverter, which is capable of pushing (or pulling) 160A from the lithium Batteries. I might pull 160A in a peak now and then but certainly have limited the charge current to only 60AH, which is about 0.1C per bank. Oh and I ordered my TOMZN breakers from the official TOMZN store on AliExpress, waaaay cheaper. Also got my PV Breakers and SPD's for the AC and DC side from them at the same time. Quote Link to comment Share on other sites More sharing options...
gimme_power Posted June 8, 2023 Author Share Posted June 8, 2023 14 hours ago, PsyCLown said: Very nice price indeed, although specs only state 2500 cycles? Am I missing something? I see they qualify that it is >2500 cycles when cycled at 1C between 3% and 100%, with 80% capacity remaining after 2500 cycles. I doubt you will cycle a battery that hard in a solar application. The battery should last well over 10 years in my opinion. WannabeSolarSparky 1 Quote Link to comment Share on other sites More sharing options...
gimme_power Posted June 8, 2023 Author Share Posted June 8, 2023 On 2023/06/07 at 10:08 AM, NoordSolar said: I have bought 32 cells from Altergrid and have started testing with a Zketech battery capacity tester and a YR1035+ Internal resistance tester. IR are all between 0.48 and 0.52 mohm. Capacity for these cells is rated at 0.33 C from 3.65V to 2.0V I measured from 3.65V at 0.2C down to 2.8V and extrapolated from a single cell that was tested to 2.5V . ( This provided an additional 2.0 AH ) So I measured from 182 -184 AH to an effective 2.5V ( 7 cells tested so far ) . There are very nicely built with a high build quality Nice, how are you planning to put them together? Post us your ideas and pics. Quote Link to comment Share on other sites More sharing options...
NoordSolar Posted June 9, 2023 Share Posted June 9, 2023 I'm be using the clips and possibly busbars from Altergrid who will be importing them ( expected next month ) . Will stack two packs of 16 on top of each other on a 70cm deep shelf Quote Link to comment Share on other sites More sharing options...
NoordSolar Posted June 9, 2023 Share Posted June 9, 2023 Regarding busbars , one could use 3 two hole busbars to link two adjacent cells for a 2P battery but am looking to make a busbar like this ( Busy getting a quote from China. for this ) Quote Link to comment Share on other sites More sharing options...
NoordSolar Posted June 9, 2023 Share Posted June 9, 2023 Has anyone had busbars made using laser cutting copper? Quote Link to comment Share on other sites More sharing options...
NoordSolar Posted June 9, 2023 Share Posted June 9, 2023 On 2023/06/07 at 10:08 AM, NoordSolar said: I have bought 32 cells from Altergrid and have started testing with a Zketech battery capacity tester and a YR1035+ Internal resistance tester. IR are all between 0.48 and 0.52 mohm. Capacity for these cells is rated at 0.33 C from 3.65V to 2.0V I measured from 3.65V at 0.2C down to 2.8V and extrapolated from a single cell that was tested to 2.5V . ( This provided an additional 2.0 AH ) So I measured from 182 -184 AH to an effective 2.5V ( 7 cells tested so far ) . There are very nicely built with a high build quality Been continuing testing these cells and one day after the cold spell it got down to 11 deg in my testroom and capacity therefore measureed 3 AH lower than the previous. HAve now rigged a heater to keep the cells at around 25 deg and the change is remarkable - capacity are all now about spec at around 186-188AH ( to 2.5 V ) rated spec is actually down to 2.0V gimme_power 1 Quote Link to comment Share on other sites More sharing options...
Brushless Posted June 10, 2023 Share Posted June 10, 2023 (edited) Bought some of these cells new yesterday from Telenetix in Centurion (0861887847) for R1140 each (incl. VAT). Pity the busbars and clips aren't available here yet but I'm having some busbars CNC cut from aluminium. Will try 3D print some clips after modifying the STP file (*thanks NoordSolar for the link). Top balancing large capacity cells like these is going to be a challenge though as my biggest charger only does 15A. Anyone in JHB have a high amp LFP charger? Edited June 10, 2023 by Graham sunset1 1 Quote Link to comment Share on other sites More sharing options...
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