Hey! It’s
been a long winter here is Stockholm but it´s finally over. I haven’t been
working that much in the Fiat, a new floor pan for lowering drag and a new
battery gauge has been installed.
I wanted to
get a better view of the energy flowing through the system so I changed my
paktrakr for a E-Xpert HV. What I loose is the individual monitoring of each
12v block, what I gain is the possibility to track amp-hours (ah) going in and
out of the battery.
I have a
90ah, 76,8v pack. So my total energy is about 6912 Watt. I ran a test today to
see how far I would get using 80% of battery capacity (72ah). The test run
included both highway, about 80Km/h, and city driving. Traffic in central
Stockholm was horrible with a lot of stop & go.
I used my Android to record the trip:
The Xpert
uses a shunt to monitor the Ah that flows through the circuit. Removing energy
from the pack is symbolized by the minus sign on the display below. When the
pack is fully charged the meter show 0.0 Ah and as I start to drive the negative
value increases. Basically what I did was to drive one way until I reached 50%
SOC and then turned around.
Google
My Tracks gives me the following info:
The meter
on the fiat show 53 km:
start
stop
So I’ve
used about 5530W (80% of my total 6912) to drive 52 km. And I still have 20%
more in the battery before it is all empty. That 106 watt per kilometer, mixed
driving. Now that’s impressive.
Stay tuned!
