16s BMS or 17s BMS

and the controller to see what caps are in there
17s x 3.6v=61.2v nom
17s x 4.2v=71.4v

you would need a minimum of 72v caps in the controller

16s x 3.6v= 57.6v nom
16s x 4.2= 67.2v

you would need a minimum 68v caps inside

havent looked at the price of a bms lately
a good active balancer thats programmable and bluetooth
16s is half the cost of the same at 17s
 
Are you building your own pack?

16S is better unless you are trying to go that little bit faster

and know the controller electronics can go up to 72V
 
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i like 17s. BMSes and chargers are now available at practically the same prices as 16s
 
i like 17s but the problem i have is that i want all my batteries to be interchangeable with my boat
cant go over 60v nominal for the boat

so whats up with that bms saying 60v/17s?
 
60V is a regulatory cutoff for human-safety requirements

Anything spec'd over that needs lots more hoops jumped to get certified for import

So that's a good label even if nominal is just a tad higher
 
ZeroEm said:
60V cut off is not 60v nominal. What's that 15s at 4V max charge. 14s would stay under 60V.

Just wondering. Trying to get it straight in my head.
I did not mean cutoff of usage like LVC / HVC just where certifying bodies draw the line for more stringent regulations.

I imagine they would use the high end of the range the voltage the system is designed to use, so yes charging voltage.
 
by john61ct » Sep 04 2021 11:24am

ZeroEm wrote:
60V cut off is not 60v nominal. What's that 15s at 4V max charge. 14s would stay under 60V.

Just wondering. Trying to get it straight in my head.
I did not mean cutoff of usage like LVC / HVC just where certifying bodies draw the line for more stringent regulations.

I imagine they would use the high end of the range the voltage the system is designed to use, so yes charging voltage.

I under stand 60V is a safety limit as far as our skin so they say. I'm sure it depends on many more factors.

I have been reading
by goatman » Aug 16 2021 6:44pm

i like 17s but the problem i have is that i want all my batteries to be interchangeable with my boat
cant go over 60v nominal for the boat

so whats up with that bms saying 60v/17s?
and wondered if I am confusing facts, don't want to live in a echo chamber.
To really stay under 60V it would be a 13S as not to reach 60V correct?
 
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