Recent content by ehahn

So instead of adding any kind of resistor, I just add smaller wire and maybe a smoke alarm? lol people are really going to love me in this thread if I do that too ?

Beautiful! You don’t need a capacitor because it only diverts current to circuit ground if voltage exceeds 18v, and if voltage exceeds 18v you can be sure your internal regulator is in the process of reducing current to the field excitation circuit. I’ll probably just buy one of those. Thanks...

If that is impractical, rather than adding a large capacitor in parallel, perhaps I could use a zener diode, resistor, MOSFET, and 500A relay to divert current to an empty capacitor to absorb the load when voltages exceed the zener diode threshold. A capacitor's charging curve is logarithmic, so...

My application is for overlanding, so I can absorb a little more risk than a yacht could. This seems unlikely, but in this case I'd probably buy another LiFePO4 with the BMS. Most of the ones I was able to find mention frying the alternator due to it getting too hot, but I haven't seen anything...

Another good point! This rapid load demand change problem is getting pretty pesky. I still question though, are we certain it's easier to control for all possible causes than it is to mitigate? How about a voltage sensing device that diverts to a dimmable load that ramps down slowly? Is PWM...

Hmm, yeah sounds like the easier path would be to rate the alternator output voltage such that the BMS never disconnects. I'm ok with 90% SOC.

Genius! I thought of that right before I saw your post. Great to know it’s working out for you! Sounds like I might be following in your footsteps! Hopefully with a larger charge current in the constant current cycle though. I emailed them asking about it. I’ll have to wait until Monday to see...

Thanks for the solid write up! This is a good point. I gather this is because the internal regulator is too slow to respond to the rapid change in demand, causing voltage to spike when the battery is disconnected. Note: I plan to always have a load attached, so even if the battery BMS suddenly...

Assumptions: I understand LiFePO4 has a low internal resistance, so when you hook it up to an internally regulated alternator, the voltage differential from the battery and alternator divided by the battery’s low internal resistance causes a massive spike in current. The alternator quickly...

I too think it’s downright absurd that it’s so difficult to fast charge LiFePO4 from perfectly capable alternators. I’ll offer a few ideas that have come to my mind to generate some more conversation: 1. I’ll call this approach, cheap and big Cheap, big alternator(s) Cheap, big 12vdc 500A...