OVMS User Manual page 25

OVMS: Renault Twizy User Guide
Important note: the interpretation of the CAN value as power ("W"/"Wh")
false. The correct interpretation is current / coulombs ("A"/"Ah"), to get these divide the old "W"
values by 64.
Since V3.6, both values are delivered separately by the OVMS. The power and energy values are
calculated from the actual battery current and voltage (power = current * voltage). The current and
coulomb counts can be seen as very precise, while power and energy may contain measurement
errors: currently the only identified battery voltage info on the CAN bus has a time resolution of 1
second (vs. 10 ms for the battery current), so the power calculated from that will contain an error
during a second with a sharp voltage jump (i.e. from sudden high currents).
New for V3.2.1 are speed and acceleration averages. These are only taken from driving phases, i.e.
moving with at least 1 kph. A speed change of more than 1 kph per second is interpreted as an
acceleration or deceleration phase.
Note: the acceleration and deceleration averages were too high before version 3.4.0. Version 3.4.0
improves the calculation but is still just an estimation.
Power statistics are currently reset when switching the Twizy on, and the report is sent after
switching the Twizy off, it at least 25 Wh have been consumed. No configuration is currently
needed, statistics are enabled by default and will run in the background.
To suppress the power statistics notifications, add 16 to feature #14 (car bits). This will suppress all
informational notifications.
Command
POWER
-or-
POWER E
Function
Output current power efficiency report. This is also sent
automatically when turning the Twizy off (and at least 1 Wh
was used).
Example:
Trip 23.4km 32.7kph 132Wpk/6% SOC-12.5%=57.1%
=== 33% 93Wpk/7%
+++ 34% 4.7kps 204Wpk/1%
--- 33% 3.2kps 97Wpk/13%
^^^ 65m 108Wpk/14%
vvv 33m 140Wpk/7%
Read: trip length was 23.4 km with an average speed of 32.7
kph. Total efficiency on that trip was 132 Wh/km, and 6% of the
energy used has been regained by recuperation. 12.5% SOC has
been used for the trip, the new SOC is 57.1%.
The following three lines give the speed sections with their
percentage of the whole tour. Accel (+++) and decel (---) phases
also include the average acceleration in kps = kph per second.
Up (^^^) & down (vvv) finally show the level sections, the
25 / 77
2019/05/02 RT3.9.1
prior to V3.6 has been