Quote:
Originally Posted by IamIan
On a flat (or very close to it) I can maintain a bit over 45 MPH in 5th for as long as my battery has power to give .. small hills are an entirely different story ... Maybe I'll do some runs to put firmer real world numbers on the face of it .. but my current setup still has all those ICE parasitic losses .. and I'm not running any of Peter's more power mods ... just a tiny bit of more power from the A123 pack being a nominal 156v instead of 144 .. ~8% more v and thus also ~8% more A .. or about ~16% more power .. and less internal resistance (thus less voltage sag) ... depending on pack temperature about ~40% less IMA pack internal resistance.
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So ... I Couldn't sleep .. so .. went out and did real world proof run in EV-Mode.
Outside Air Temp ~45F
5th Gear
~4 Miles
~50MPH
Loaded IMA Battery held
146-145v 64-65A ~9.4kw for pretty much the whole time.
IMA Battery Temp Started ~66 went to ~77F .. not bad .. considering over 3C rate , and only cabin air fan for cooling .. and even @ ~95% energy efficient would still mean about ~470Watt heater running inside the battery the whole time @ that ~9.4kw output rate.
Consumed about ~30% of my A123 Pack's usable SoE/SoC Window , or about ~730Wh out of ~2.5kwh .. soo with ICE air pumping parasitic losses on a pretty much flat stretch of road got ~5.4 Miles per kwh .. If I had to .. Max I could do with parasitic ICE with the SoC/SoE window I use on my A123 pack would go about 10~12 Miles EV on flat road like that .. I suspect if continued to be pushed that hard continuously 9-10kw eventually (only a matter of time) the IMA MDM electronics , or the IMA motor .. one or the other might over heat .. more down around 4-5 kw continuous is probably better if one plans to do long runs with the OEM Gen1 IMA Motor.
Attached is the elevation graph ... technically I went up a slight incline .. ~5m over ~4 Miles .. but still pretty flat over all.
I upload the crappy cell phone video to my google drive .. phone doesn't do well in low lighting .. and it didn't rotate the video for some reason this time like it normally does .. but if you want to watch it you're welcome to.
Link
Keeping in mind probably a little over 1/3 of the battery power / energy used to achieve the above .. was wasted as ICE friction and air pumping.
Also keep in mind .. I don't usually use my system like that .. it's just not a very efficient use of the IMA Battery energy .. I usually use it to keep in LB more often and such like that ... only in rare low speed low power conditions do I ever use that EV-Mode .. I never go that hard of an EV-Mode for that long either ... But it does have that much power if needed for short periods.
Soo that's the example .. Which pretty much lines up fairly closely with the previous estimated calculations of of wind / rolling resistance / etc @ ~50MPH .. on flat level ground .. ~10.11 kw was the estimate ~60F .. Got ~9.4kw at 45F .. and with head light load the whole time .. soo a little better ~10% .. but fairly close to calculated estimate.