Daly BMS gone crazy..Update Opinions
I was charging my 120ah lifepo4 battery yesterday and came in for lunch and saw it shut down..I figured it hit the 3.65 volt cell limit and shut down,I went out to check it and saw this on the Blueto...
Forum Discussion
Itinerant1 wrote:
A alternator testing by Lifepo4 by Victron.
https://youtu.be/jgoIocPgOug
This is a great example to prove a point, but is not really a real world scenario (confirmed by the fact that there are no reports of this actually happening, including my own set up).
Look at the size and speed of the pulley on the motor, it is about the same size as the pulley on the alternator, meaning the alternator spins at the same speed as the motor. Now compare this to an actual vehicle, the crankshaft pulley is 3-4x the diameter of the alternator pulley, meaning the alternator is spinning 3-4 times faster than the engine - and gets plenty of cooling (first scenario in their test where the alternator was outputting 65A and was fine).
Secondly, any modern vehicle will have an ECU controlled alternator, which monitors the temperature of the alternator and will drop the output if it starts to over heat (just like the Balmar).
This is very much an echo-chamber problem (much like the low temperature lithium charging). There is a kernel of truth to it, but it is only an actual problem in an extremely limited number of circumstances. However, this wisdom gets repeated again and again on the forums, and becomes gospel. The retailers are also happy to reinforce it, as it means they can sell you not just batteries, but batteries + DC-DC charger + battery heater.
