LiPos gone bad? Help analyze Emeter output
04-14-2006, 04:17 PM
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LiPos gone bad? Help analyze Emeter output
I'm having problems hitting the LVC on 2 of my lipo packs. Here's the setup:
Himax 2812-0850
CC PH25
APC 11x4.7 SF
The batteries are
TP 3S2P 2100 Gen2 - a year old, ~150 cycles
TP 3S2P 1320 Gen2 - a year old, ~75 cycles
TP 2S2P 2000 Pro-Lite - brand new, 2 cycles
I posted the Emeter graphical Volt/Amp/Watt/RPM charts at http://members.cox.net/wildbill13/lipo/1147.html
Each test was run with off a fresh charge. I ran the motor up to 1/2 throttle for a short delay, then up to full throttle when I would hit LVC immediately. I repeated this 3 times. You can see the difference from the new Pro-Lite which never hit LVC.
I can only surmise that my 2 old batteries are ready to retire, given that they are hitting LVC even before reaching 12 Amps off a fresh charge.
Can anyone shed any light on this?
What kind of life expectacy are folks getting out of TP Gen 2 packs that've been ridden fairly hard?
(the meter read 3000 RPM at rest, bad lighting perhaps)
TIA,
Bill
Himax 2812-0850
CC PH25
APC 11x4.7 SF
The batteries are
TP 3S2P 2100 Gen2 - a year old, ~150 cycles
TP 3S2P 1320 Gen2 - a year old, ~75 cycles
TP 2S2P 2000 Pro-Lite - brand new, 2 cycles
I posted the Emeter graphical Volt/Amp/Watt/RPM charts at http://members.cox.net/wildbill13/lipo/1147.html
Each test was run with off a fresh charge. I ran the motor up to 1/2 throttle for a short delay, then up to full throttle when I would hit LVC immediately. I repeated this 3 times. You can see the difference from the new Pro-Lite which never hit LVC.
I can only surmise that my 2 old batteries are ready to retire, given that they are hitting LVC even before reaching 12 Amps off a fresh charge.
Can anyone shed any light on this?
What kind of life expectacy are folks getting out of TP Gen 2 packs that've been ridden fairly hard?
(the meter read 3000 RPM at rest, bad lighting perhaps)
TIA,
Bill
04-15-2006, 05:08 PM
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RE: LiPos gone bad? Help analyze Emeter output
Bill,
That 3000 rpm reading indicates to me that you were indoors, that's the 50 hz flicker
, here in the US, a tach indicates 3600 when indoors (60hz X60 sec = 3600 hz/RPM, particularly with fluorescent lampe.
When I need an accurate reading indoors, I turn off lights in the area and shine a flashlight thru from the other side of the prop, with d.c. powered lampe, good reading, no hertz
(bad pun intended)
My experience in Lipo's is very limited so I can't help you on that issue, good luck.
Regards,
Pete
That 3000 rpm reading indicates to me that you were indoors, that's the 50 hz flicker
, here in the US, a tach indicates 3600 when indoors (60hz X60 sec = 3600 hz/RPM, particularly with fluorescent lampe. When I need an accurate reading indoors, I turn off lights in the area and shine a flashlight thru from the other side of the prop, with d.c. powered lampe, good reading, no hertz
(bad pun intended)My experience in Lipo's is very limited so I can't help you on that issue, good luck.
Regards,
Pete
04-16-2006, 12:35 PM
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RE: LiPos gone bad? Help analyze Emeter output
Try a 10x4.7 prop instead, my 2812-1080 didn't like the 11x4.7 prop much at all. When I switched to the 10x4.7 prop alot of my issues went away.
