Hi! My name is Nicolai from Denmark. First thread from mewuhu!
Pre-story
I've build 12v speakersystems using heavy truck-batteries. Sometimes multiple batteries. You can see my greatest creation here(Scroll down to see final product). This speaker weights like 0,7 tonnes.
Situation
Now I'm going to uni, which is far away from home. I'll be living in a VERY small apartment, but I'm not willing to let go of LOUD speakersystems haha. Thus I'm building a system running on light 18650 batteries. My SURE 2x300w amplifier will work up to 52v. Unfortunately the very common13s pack that is rated 48v goes up to 54,6V. So I'm going for a 12s solutioninstead. Choice of BMS
So the pack will be 12s3p -> up to 50,4V with 10,5Ah.
Questions and doubts
1.Hopefully I can get a hold of a spot-welder. If not - I'll use plastic holders instead. A 18650-cell-lover on youtube have tested them and they can do 4a constant per battery. I'll do 12a peak, so 4a per battery (Remember music is dynamic). If I can get a hold of a spot-welder, i'll use plastic spacers.What do you think of this solution?
2. Is there anything in this setup, which is just plane stupid. I am new to designing such battery, so it wouldn't be a surprise if it was
3. Can you find a good priced charger for a 12s setup. I can find one for a 13s setup, and if that will work on the 12s, then I'll just go with them. REMEMBER: This is not the BMS. The BMS will be for a 12s pack.
Ekstra thoughts:
Funny thought: It's surprising how easy it is to add another parallel layer. And how cheap it is. Right now it'll increase my battery capacityby 33%. If I'm crazy enough I'll increase the parallel number by one or two. It's not gonna increase weight by much. And the BMS is already in place
NOTE: If you want to read a bit about the designing-proces:
PART 1
PART 2
FINAL - w/o battery and amp box.
Thanks in advance. And sweet forum you've got here!
Pre-story
I've build 12v speakersystems using heavy truck-batteries. Sometimes multiple batteries. You can see my greatest creation here(Scroll down to see final product). This speaker weights like 0,7 tonnes.
Situation
Now I'm going to uni, which is far away from home. I'll be living in a VERY small apartment, but I'm not willing to let go of LOUD speakersystems haha. Thus I'm building a system running on light 18650 batteries. My SURE 2x300w amplifier will work up to 52v. Unfortunately the very common13s pack that is rated 48v goes up to 54,6V. So I'm going for a 12s solutioninstead. Choice of BMS
So the pack will be 12s3p -> up to 50,4V with 10,5Ah.
Questions and doubts
1.Hopefully I can get a hold of a spot-welder. If not - I'll use plastic holders instead. A 18650-cell-lover on youtube have tested them and they can do 4a constant per battery. I'll do 12a peak, so 4a per battery (Remember music is dynamic). If I can get a hold of a spot-welder, i'll use plastic spacers.What do you think of this solution?
2. Is there anything in this setup, which is just plane stupid. I am new to designing such battery, so it wouldn't be a surprise if it was
3. Can you find a good priced charger for a 12s setup. I can find one for a 13s setup, and if that will work on the 12s, then I'll just go with them. REMEMBER: This is not the BMS. The BMS will be for a 12s pack.
Ekstra thoughts:
Funny thought: It's surprising how easy it is to add another parallel layer. And how cheap it is. Right now it'll increase my battery capacityby 33%. If I'm crazy enough I'll increase the parallel number by one or two. It's not gonna increase weight by much. And the BMS is already in place
NOTE: If you want to read a bit about the designing-proces:
PART 1
PART 2
FINAL - w/o battery and amp box.
Thanks in advance. And sweet forum you've got here!