I recently bought and installed a ScanGauge II in our FFH. After driving a 100+ miles with in installed over the past few days I have a number of observations and a number of questions...
- Horsepower - the generator can place about a 15 horsepower load on the ICE when the battery is low and the ICE is doing maximum recharging. This is good for about 18 amps of current flowing into the HVB. In other situations it seems that each hp of ICE output to spin the generator is good for slightly more than 1 amp of current flowing into the HVB.
- Amps - the maximum regen braking charge seems to be about 30-35 amps. I've never seen the regen braking charge go above 35 amps while still getting 100% brake score. That seems to be the limit for the generator. When driving in EV 1 bar on the Empower screen is about 20 amps of current flowing out of the battery. The max current I have seen flowing out of the battery has been about 50 amps. This happened when I was accelerating in EV at 1.5 or 1.75 bars and then it kicked over to the ICE. Since one motor/generator must spin the ICE up to speed (like a starter motor in a conventional car) there is a momentary spike in amps flowing out of the battery to start the ICE.
- Recharging - The computer likes to charge the battery with a 15 amp current flow when the battery SOC is low to maybe about 75% of the display. This seems to be in the most efficient range of the ICE as well as the LOD will often be 85+ when this load is placed on the ICE by the generator while accelerating. When the battery SOC is higher than 75% of the battery icon the amps from the ICE generator drops to 5-8 amps. If the battery is almost full the current flow drops to about 3 amps.
- Coasting - when coasting with your foot off the gas pedal the generator places about a 3-5 amp load to gradually slow the car down.
- Idling - when idling the current draw to run the computers and charge the 12V battery is about 0.55-0.60 amps. This amount of current is drawn whether the car is in Park, Reverse, Neutral or Drive as long as you are not moving. The brake lights pull a minimal amount of current, but enough to make this range 0.59-0.64 amps when you are stepping on the brake.
- Lights - the headlights/taillights draw about 0.25 amps. The park lights and fog lights draw the same amperage as the headlights. If you combine headlights and fog lights the current draw is about 0.40 amps.
- HVB temps - the HVB temp quickly increases when driving from the current flow in and out of the battery. The past few days each morning the HVB temp showed the same as the exterior temp when first starting off (between 75 & 80 F) but quickly warmed up about 10 degrees within the first few miles of driving. Only on Friday where we did a lot of driving in the city in 95 F outside temps did the HVB temp go above 100 F. The HVB fans ran non-stop on Friday. Other days I noticed that at about 85 F HVB temp the fans would kick on at a low RPM (about 750-1000 showing on the display). On Friday I saw the HVB Fan RPMs as high as 2000. Even when running at that speed I still couldn't hear the fan when I got out of the car to listen with it "running" and with the SGII indicating a fan speed of 2000. I imagine that when we hear the fan running from outside the car after the car is off it must be running much faster than 2000 RPM.
- Current draw when off - after turning off the car in the few seconds before the SGII turns off the power draw shows 0.04 amps. This is likely to run whatever computers are still active to display the Trip Summary and Lifetime Summary screens.
- AC amp draw - the AC will draw 15-20 amps from the HVB when first turned on with a hot car. Once the car has cooled down the AC continues to draw an extra 2-3 amps minimum that we observed. This puts some numbers to the effect of AC on gas mileage. That is a lot of current that must be replaced by burning gasoline.
- Battery display on dash without charge/discharge arrows - It is very hard to get the battery display to show no arrows for charging or discharging. It appears that while moving the car displays no arrows when the current flow is less than 1 amp in or out of the HVB. However, sometimes the current flow will be less than 1 amp and the dash will still display arrows for charging or discharging. Also, when stopped a current flow of less than 1 amp displays as the HVB is discharging. No matter how hard I've tried I have never been able to get the display to show 0.00 amps as the current flow. With steady pedal pressure it is possible to keep the amp flow steady for many seconds though while driving as long as the slope of the road doesn't change.
- Warm up stages - when the ICE is in S1a the power demand on the ICE is very low, less than 10 hp and a LOD less than 60, this is quite inefficient and shows why skipping stage S1a improves fuel economy so much as discussed here
- What exactly is LOD (Load)? The car often shows 95-99 when accelerating slightly more aggressively such as accelerating onto the freeway, when accelerating in the city it often shows only 80-85. When the ICE is idling in warm up the LOD is as low as 50. Is this the % of maximum power output of the ICE at the current RPM?
- How do I understand the ignition timing screen (IGN)? When the ICE is off it shows -10. When the ICE is on I've seen values anywhere from 5-8 (when ICE is under load accelerating) to 30+ (mostly when the ICE is under a light load but still on such as freeway driving where the Empower screen shows the power demand being just above the EV threshold.
- Why does the car show 1.2 horsepower when the ICE is off? I tried using the adjustment in the setup but even decreasing the reading by 10% only lowered the display when the ICE is off to say 1.0 horsepower. What does the default value of 1.2 hp when the ICE is off mean for the numbers that the SGII displays for hp while I'm driving?
As I think of more items I'll continue to add to this thread. As it stands now I hope that my observations will be of benefit to others and that those with more experience and knowledge than I will be able to shed some light on my questions. Thanks in advance for that help!
Edited by hybridbear, 18 September 2013 - 08:08 AM.