23 replies to this topic

[Stokeme]

This popped up, from YouTube, after having a phone conversation with my (engineer from birth) oldest son. This is not the first time my iPad has listened to me & “helpful” videos have appeared out of the blue. This was topical.

Edited by Stokeme, 04 February 2020 - 10:32 PM.

[Wandering Sagebrush]

Alexa?

[Vic Harder]

That is some very interesting info.  I'm rethinking my alternator to Battleborn connection.  Thanks.

[CougarCouple]

Hay Vic
Do you think a D.C.-D.C. Charger would remove this load placed on the alternator causing the over heating? Or do you think that charging and alternator speed would need to be addressed.

Russ

[Vic Harder]

I have a DC-DC lying around that I will likely add to my setup.  It would limit the current for sure.  I was quite concerned about that video... my truck cruises at 1800 rpm, and I've seen 90A going over the wires  

[Kolockum]

Very good information. Thanks for posting this.

[Happyjax]

Very informative. Thanks!

[roverjohn]

Could someone explain why they disconnected the BMS? Current limiting there would be a much less expensive solution especially considering that that battery appears to retail for about $3k. Plus who sets up a rig like that? 

[Vic Harder]

Not sure why, but I also don't see that it would have stopped the overheating.  As noted above, my truck running at 1500 rpm puts out 80+ Amps into a single 100AH LiFePo4 battery.

 

Now, what I do see is that there is no reduction gearing on the test setup.  Not sure what my truck has, but the pulley on the crank is MUCH bigger than the alternator, so 1500 engine RPM is likely 5000 alternator RPM.

[CougarCouple]

Rover John
I think the alternator was overheating due to load. I think the test was set up to see what would happen to the alternator when battery was in a discharged state hence no controller.
BMS internal protecting battery. ( I’m thinking about the internal battery BMS)
Am I wrong, I thought you could put a lot of current into a discharged battery.

Thanks Russ