Hi All,
After a month of enough drama to make an American Soap Opera, I'm finally fiddling with "Frankentraption" again. I want to reduce the 33-35 Amp peak draw on my 36V 12AH LiFePO4 to a more sensible level - I was thinking to 20 Amps (it's supposed to be a 500W DD Motor kit, and currently peaks at 1200+W draw).
Barrage of Questions:
1) I have 2 shunts, so the easy thing would be to remove one, to give me around 16-18ish Amps - Correct?
2) I could solder a little up the shunt to adjust it 20 Amps anyway - correct?
3) What are the cons? Does the shunt get hot, and I'm going to make it worse?
4) How will it likely affect my assist? I think I'll find an obvious reduction on the very steep hills (can pull 30+Amps continuous for 90 seconds+ at the moment), some reduction in acceleration but minimal reduction in top speed on level roads (I usually don't use the assist on dead flat roads, as it seems to do nothing over about 18MPH)
Sound ok? My battery BMS has been cutting out just before home, after 2 steep hills very close to each other (30+ Amps for 90 seconds, 20 second downhill, 30+ Amps for another 90 seconds), so by limiting the draw, I should be able to avoid the voltage sag that's cutting the battery out. Currently, if I ride with very conservative throttle on those hills, it makes it OK - Trying to ride up a steep hils and smoothly hold about 1/2 throttle is difficult, and I'd like to extend my batterys lifetime as much as I can!
Thanks for any input/advice/money you can offer .
Allan.
After a month of enough drama to make an American Soap Opera, I'm finally fiddling with "Frankentraption" again. I want to reduce the 33-35 Amp peak draw on my 36V 12AH LiFePO4 to a more sensible level - I was thinking to 20 Amps (it's supposed to be a 500W DD Motor kit, and currently peaks at 1200+W draw).
Barrage of Questions:
1) I have 2 shunts, so the easy thing would be to remove one, to give me around 16-18ish Amps - Correct?
2) I could solder a little up the shunt to adjust it 20 Amps anyway - correct?
3) What are the cons? Does the shunt get hot, and I'm going to make it worse?
4) How will it likely affect my assist? I think I'll find an obvious reduction on the very steep hills (can pull 30+Amps continuous for 90 seconds+ at the moment), some reduction in acceleration but minimal reduction in top speed on level roads (I usually don't use the assist on dead flat roads, as it seems to do nothing over about 18MPH)
Sound ok? My battery BMS has been cutting out just before home, after 2 steep hills very close to each other (30+ Amps for 90 seconds, 20 second downhill, 30+ Amps for another 90 seconds), so by limiting the draw, I should be able to avoid the voltage sag that's cutting the battery out. Currently, if I ride with very conservative throttle on those hills, it makes it OK - Trying to ride up a steep hils and smoothly hold about 1/2 throttle is difficult, and I'd like to extend my batterys lifetime as much as I can!
Thanks for any input/advice/money you can offer .
Allan.