October 15, 20232 yr 49 minutes ago, Steve87 said: @Chris_SI am very jealous...It's so much fun building these. I know what you mean. I'm going to be bored once this build is over. 😩
October 16, 20232 yr My self experience of the 230ah EVE cells is that they are great quality and test above specification much more so than the 280ah cells.
October 16, 20232 yr 19 minutes ago, Steve87 said: My self experience of the 230ah EVE cells is that they are great quality and test above specification much more so than the 280ah cells. Yeah they seem to be that way. Only small issue is their 4000 cycle rating. The EVE K range cells have a 6000 cycle rating. Time will tell I guess.
October 16, 20232 yr Even 4000 cycles is 10 plus years if you cycle them once a day. I think in 10 years the battery technology would have changed so much our batteries of today will look as if it came from the ice age🤣
October 16, 20232 yr 12 minutes ago, Jacques Ester said: Even 4000 cycles is 10 plus years if you cycle them once a day. I think in 10 years the battery technology would have changed so much our batteries of today will look as if it came from the ice age🤣 I totally agree.
October 18, 20232 yr On 2023/10/16 at 9:44 AM, Chris_S said: First 230Ah cell tested 237Ah Tested another cell and it came out at 237.3Ah so not going to test more. Busy with top balancing then will capacity test the pack.
October 18, 20232 yr Author 6 hours ago, Chris_S said: Tested another cell and it came out at 237.3Ah so not going to test more. Busy with top balancing then will capacity test the pack. Awesome. I'm very happy with my cells. I've run 3 full cycles and very happy. Paired with the v3 seplos BMS(update firmware) and it's great. 6mv deviation at 100% soc. Seplos default voltages seem rather conservative tho, what voltages are you going to settle with? I mean high voltage alarm, high voltage protection etc
October 19, 20232 yr 10 hours ago, cp69 said: Awesome. I'm very happy with my cells. I've run 3 full cycles and very happy. Paired with the v3 seplos BMS(update firmware) and it's great. 6mv deviation at 100% soc. Seplos default voltages seem rather conservative tho, what voltages are you going to settle with? I mean high voltage alarm, high voltage protection etc I keep my settings conservative. Cell high voltage alarm 3.45V Cell high voltage protection 3.5V Pack high voltage alarm 55.2V Pack high voltage protection 56V Going higher is really not worth the tiny extra bit of capacity.
October 19, 20232 yr Hi Do you guys recommend these? Been communicating with Candice / Apex for a couple of months now, after getting hold of them through Alibaba. I'm looking to buy 16 x 280AH cells (paired with v3 seplos) since they have stock at their Kempton Park warehouse @ $97/pc. So roughly ~R30 000 for ~15kWh Edited October 19, 20232 yr by jeeva
October 19, 20232 yr 25 minutes ago, jeeva said: Hi Do you guys recommend these? Been communicating with Candice / Apex for a couple of months now, after getting hold of them through Alibaba. I'm looking to buy 16 x 280AH cells (paired with v3 seplos) since they have stock at their Kempton Park warehouse @ $97/pc. So roughly ~R30 000 for ~15kWh The EVE cells are one of the best. Also these cells are grade A. To good of a deal to pass up on.
October 19, 20232 yr 12 minutes ago, Chris_S said: The EVE cells are one of the best. Also these cells are grade A. To good of a deal to pass up on. What would a total build like this cost, including a BMS and a battery case which houses the cells and all the busbars etc. Lets say either (230AH or 280AH cells x 16) and a BMS compatible with SunSynk 5Kw inverter. Edited October 19, 20232 yr by Greglsh
October 19, 20232 yr 1 minute ago, Greglsh said: What woulda total build like this cost, including a BMS and a battery case which houses the cells and all the busbars etc. I'm not 100% sure on cost. But $97 per cell and $600 for the DIY box which includes everything. You can build a R100k battery for R50k
October 19, 20232 yr 2 minutes ago, Chris_S said: I'm not 100% sure on cost. But $97 per cell and $600 for the DIY box which includes everything. You can build a R100k battery for R50k Okay, also don't you need all the charging and balancing equipment if you build your own battery? Would be a nice project.
October 19, 20232 yr Author 10 minutes ago, Chris_S said: I'm not 100% sure on cost. But $97 per cell and $600 for the DIY box which includes everything. You can build a R100k battery for R50k And that's a battery with best of the best cells. Guaranteed Grade A brand new. Many of the better priced retail batteries are using unknown cells and some are 2nd life cells. You just need a little bit of basic electrical knowledge to build your DIY 15kw battery
October 19, 20232 yr 12 minutes ago, Greglsh said: Okay, also don't you need all the charging and balancing equipment if you build your own battery? Would be a nice project. Basic power supplies and even old style transformer car charger can be used to charge 4 at a time until you do top balancing. Then a good custom adjustable BMS can do the final balancing before a DIY is put into service.
October 19, 20232 yr Where do you guys get your cells and other equipment locally. I don't want to deal with Alibaba and Aliexpress would only buy from someone local who has sold to a few people on this forum.
October 19, 20232 yr 56 minutes ago, Greglsh said: Okay, also don't you need all the charging and balancing equipment if you build your own battery? Would be a nice project. The cells come well balanced already. And the bms is capable of balancing albeit a little slow. But cp69 put his together and had only a 6mV difference which is perfect. Can slap your battery together in a couple hours.
October 19, 20232 yr 1 hour ago, Greglsh said: Okay, also don't you need all the charging and balancing equipment if you build your own battery? Would be a nice project. https://youtu.be/ag0Y4w5-iQQ?si=vtsN7DC7AvrrebuT
October 19, 20232 yr 1 hour ago, Chris_S said: The cells come well balanced already. And the bms is capable of balancing albeit a little slow. But cp69 put his together and had only a 6mV difference which is perfect. Can slap your battery together in a couple hours. Could be so but below 60% SOC. To get large capacity cells to 3.6V to balance at the top end does take a lot of time. More so as you want to charge at a low rate and for sure not 0.5-1C but rather 0.2C or even 0.1C. Then you want to deep discharge and recharge a few times before putting into service. Just how I think and what I have done. Edited October 19, 20232 yr by Scorp007
October 19, 20232 yr 41 minutes ago, Scorp007 said: Could be so but below 60% SOC. To get large capacity cells to 3.6V to balance at the top end does take a lot of time. More so as you want to charge at a low rate and for sure not 0.5-1C but rather 0.2C or even 0.1C. Then you want to deep discharge and recharge a few times before putting into service. Just how I think and what I have done. I have found the seplos BMS to do a pretty good job at top balancing if keeping the pack at 100% SOC until its done. It has a process called intermittent charge/discharge once it hits 100% SOC and before dropping below 96% SOC. It uses small current constantly. Between 1A and 6A and continually balances. Provided the cells start out reasonably in balance that is.
October 20, 20232 yr 19 hours ago, Greglsh said: Where do you guys get your cells and other equipment locally. I don't want to deal with Alibaba and Aliexpress would only buy from someone local who has sold to a few people on this forum. They have an offset point in Kempton Park now, however you still need to pay via SWIFT in Dollars to their Chinese company.
October 20, 20232 yr 53 minutes ago, jeeva said: They have an offset point in Kempton Park now, however you still need to pay via SWIFT in Dollars to their Chinese company. PayPal and alibaba pay is an option I believe. Try use alibaba. PayPal fees are ridiculous.
October 20, 20232 yr 1 hour ago, Chris_S said: PayPal and alibaba pay is an option I believe. Try use alibaba. PayPal fees are ridiculous. you can just directly EFT from your bank. This is the proforma they sent me yesterday. You can remove shipping and use your own (from JHB). $176 US for local shipping is a bit steep. edit: i do noticed now the line item shows "230" and not "280ah", I will have to e-mail them. (and i see they have the 304AH cells now) Edited October 20, 20232 yr by jeeva
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