Boogieman Posted September 4, 2021 Share Posted September 4, 2021 (edited) Lets collect all data about the most important part to keep fresh. I will need help to get info and correct me if i am wrong and ill add it to this first post so its easy to find. Battery specs (single cell) Battery type: NCR18650GA mAh / battery: 3450mAh Max continuous discharge current: 10A max voltage: 4.2V Nominal voltage (storage voltage): 3.6V Veteran 0% voltage: 3.15V (Chirull & div) Min voltage (Discharge cut-off): 2.5V Weight: 48g Pack specs (100.8V3200WH) Setup \ 4 packs: 24s10p Nr of packs: 4 (2/side*12s5p = 24s5p/side) Nr of BMS: 2 (1 per side) Max voltage: 100,8 V (4.2V*24series) Storage voltage (nominal voltage): 86,4 V** Min voltage (Veteran 0V): 75,6 V (Min voltage (Discharge cut-off): 60V (2.5V*24) NOTE! THEORETICAL VALUE IF ALL CELLS DISCHARGE EQUAL which is not likely) Weight: 60batteries * 48g / pack= 2.88Kg/pack 2.88Kg * 4 packs = 11,5 Kg ** Compared to battery university recomendation 40–50 % SoC = ??? V / general guideline 3,7V*24= 88,8V https://batteryuniversity.com/article/bu-702-how-to-store-batteries Battery cell Data sheet https://cdn.shopify.com/s/files/1/0481/9678/0183/files/Sanyo-Spec-NCR18650GA.pdf?v=1605877395 Edited January 14 by Boogieman 1 Quote Link to comment Share on other sites More sharing options...
Chriull Posted September 4, 2021 Share Posted September 4, 2021 12 minutes ago, Boogieman said: Min voltage: 3.7V (or 3V ? If 3 below is wrong) 3.7V is about nominal voltage. 2.5V is minimum voltage specified by the manufacturer. The sherman uses the cells downto 3.3V, maybe to 3.15V? Or this changed maybe with newer boards/firmware? About nominal voltage is great for storing - exactly 60% are not necessary or especially "great" 21 minutes ago, Boogieman said: Setup \ 1 pack: 24s10p (batt pack calc says 28s/10p to reach 100.8V ????) Total config is 24s10p. 100.8V is max voltage (4.2V*24) and not nominal (3.6V*28)! These 24s10p is organized in 4 packs 12s5p each. On each side two 12s5p packs are combined with one BMS to an 24s5p pack. https://ecodrift.ru/2020/07/05/razbiraem-veteran-sherman-iz-pervoj-postavki-mnogo-udivitelnyh-otkrytij/ 27 minutes ago, Boogieman said: 80% charge voltage Shiver - noone needs this! Quote Link to comment Share on other sites More sharing options...
div Posted September 5, 2021 Share Posted September 5, 2021 (edited) On 9/4/2021 at 3:10 PM, Chriull said: 3.15V? Yep, 3.15V per cell for the Sherman -> 75,6V "0%" voltage for the pack. Nominal Voltage for these cells is 3,6V so around 86,4V for long term storage. Edited September 5, 2021 by div 1 Quote Link to comment Share on other sites More sharing options...
Boogieman Posted January 14 Author Share Posted January 14 (edited) Thanks @Chriulland @div Took a while but updated the specs and added a data sheet for reference. Hope it looks better now btw how do you calculate SOC level? (SoC % * (max voltage - min voltage)) + min voltage does not add up. Neither does (max - nominal) Edited January 14 by Boogieman Quote Link to comment Share on other sites More sharing options...
Chriull Posted January 14 Share Posted January 14 2 hours ago, Boogieman said: btw how do you calculate SOC level? Charge% as reported by the apps is Charge % = (Actual_Battery_Voltage - 0%_Voltage) / ( 100%_Volrage - 0%_Voltage) * 100% 100%_Voltage is with most wheels some ?4.16V?. 0%_Voltage something around 3.15V to 3.3V depending on wheel and firmware version. Once Actual_Battery_Voltage is taken after some rest (no charge, wheel turned off) it is somewhat related to the real S(tate)o(f)C(harge). Quote Link to comment Share on other sites More sharing options...
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