Owner`s manual

VANNER Incorporated OWNER’S MANUAL
PMEC-12/24 OWNER‟S MANUAL
5
Theory of Operation
Battery Monitoring
The primary function of the PMEC is battery monitoring. The monitoring algorithm analyzes battery
voltage, current, and temperature inputs, and calculates/estimates the SOC (State of Charge), SOH
(State of Health), SOCach (Achievable State of Charge based on SOH and temperature of battery), U
(Estimated Time to Run), and Up (Estimated Time to Run adjusted by SOH and temperature of
battery) of the battery.
Battery Profile
The characteristics of a battery differ by type, manufacturer, and capacity. It is critical to use the
appropriate battery profile for accurate battery monitoring. Currently, eight different battery profiles
are stored in the PMEC software:
(1) East Penn 8A31DT
(2) East Penn 8A31DT x 2 (two batteries connected in parallel)
(3) Deka 7T31
(4) Deka 7T31 x 2 (two batteries connected in parallel)
(5) Deka Dominator 8G31
(6) Deka Dominator 8G31 x 2 (two batteries connected in parallel)
(7) Lifeline GPL-8DL
(8) Lifeline GPL-8DL x 2 (two batteries connected in parallel)
Note: See “Key Sense and System Voltage Level Configuration” on page 7 for series and parallel
setting for 12V and 24V systems.
Select the proper profile to match the vehicle battery for optimal estimations. If the vehicle battery
parameters differ from the above profiles, the Vanner CAN interface software allows the user to enter
battery parameters via CAN bus. Please reference the Vanner CAN Interface User Manual which is
available at http://www.vanner.com/vp/manuals.htm. Alternatively, the user can send the battery
parameters to Vanner and let Vanner load the new battery profile into the software. A list of battery
parameters used by the software is shown in Table 1.
Table 1: List of battery parameters used by PMEC software
No
Symbol
Description
1
Nj
Number of cells in battery
2
Nb
Number of batteries connected in parallel
3
Ef0_60
Charging efficiency when SOC is between 0-60%
4
Ef60_80
Charging efficiency when SOC is between 60%-80%
5
Ef80_90
Charging efficiency when SOC is between 80%-90%
6
Ef90_95
Charging efficiency when SOC is between 90%-95%
7
Ef95_100
Charging efficiency when SOC is between 95%-100%
8
C
Peukerts Amp-hour rating of battery
9
n
Peukerts number of battery
10
Tc
Temperature constant of battery
11
Tr
Rated temperature of battery
12
Ve
Endpoint voltage of battery
13
thC
Charge current threshold
14
thD
Discharge current threshold
15
thBC
Boost charge current threshold