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  1. R

    BMW i3 120Ah battery question

    Thanks, I see this one https://www.lithiumbatterypcb.com/product/12s-13s-14s-15s-36v-48v-58-8v-smart-bluetooth-bms-with-20a-to-60a-constant-discharge-current-with-uart-and-rs485-double-communication/ But I also see this is max 60a. My motor uses 83a so I got a suggestion in another topic that...
  2. R

    Building my own battery module PART 1

    Why not? Because eg. 10 cells could be at 4.1V while 2 other at 3.9V. When the BMS does not do anything there will be a deviation. I thought about this too. Am I correct that for measuring and comparing the cells that my motor has to be in the water and in a (hard?) working mode or can you just...
  3. R

    Building my own battery module PART 1

    So if I understand correctly you are saying the the charging process will be shut down if one cell reaches 4.2V. If so, this would make no sense to me because indeed other cells could still be at a lower level at that moment and could use more charging. I understand but they are intertwined in...
  4. R

    Building my own battery module PART 1

    It is the first link to the 89 dollar charger you send me. My question does not involve this particular charger but all 48V chargers in general. How am I going to connect them to my battery? Because all chargers I see do not have a PLUS and MIN cable but only just one connector. And one more...
  5. R

    Building my own battery module PART 1

    Ok, but how can I connect a charger like this to the battery? https://www.aliexpress.com/item/3282233 ... 187050f3f5 The plug is only one plug and not a MIN and PLUS
  6. R

    Building my own battery module PART 1

    So if I understand correct: WHEN SAILING: - The PLUS from the battery runs directly to the PLUS of the motor - The MIN from the battery runs directly to the BMS system - And there is a MIN from the BMS running directly to the motor WHEN CHARGING: - I don't use the PLUS from the battery - I...
  7. R

    Building my own battery module PART 1

    eee291, I still need to understand the basics better. Can you take a look at this picture I draw. Is this how the connection will be running when sailing? And if this is correct, how do I connect a 48v charger to the battery? A charger does not have a + and - connector right? And where are...
  8. R

    Building my own battery module PART 1

    Thanks for your input guys. I m not sure that I understand all things yet. Some reactions on your replies. Please correct my point if I thinking wrong! 1. The BMW i3 120Ah specs say it has a voltage of 403V at 100% charging state. The i3 has 8 modules so divide it by this gives 50,375V and...
  9. R

    Building my own battery module PART 1

    Hi Guys, Let me first say that I am by no means an expert in the world of batteries, voltages etc. at all. Despite this I m planning on building my own battery pack for my Torqeedo motor for my dinghy. So, I own a Torqeedo Cruise 4 motor which consumes 4000watt at full throttle, has a nominal...
  10. R

    BMW i3 120Ah battery question

    Hi, I m new to this forum and I m hoping this is the place to find some answers that I m looking for. I m from NL and English is not my native language but I ll try my best! I will also try to make the topic not to long. So I bought a Torqeedo Cruise 4 electric motor for my boat. You can buy...
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