Campbellot
Fuel / State of Charge Meters Details
Conversion of Year 2000 Chevy S10 Pickup
This page continues to be in work - will add more details as I have time.
These drawings are provided for reference only.
| Westberg State of Charge Meter 140 to 186 Volt Range | The State of Charge meter is used to
monitor the battery voltage. It is not very useful while driving because the
meter needle moves radically with the accelerator pedal movement. Where I
find it useful is during opportunity charging when the Curtis fuel meter is
not tracking with the amount of charge (designed that way). The Curtis meter
remembers the fuel level that was recorded at the end of the last driving
cycle until the traction battery pack is fully charged. So the SOC
meter can be used to track the percent of charge during charging. For
example, if the fuel meter is reading 1/4 tank of electrons and you plan a
trip requiring 3/4 tank and you will not have the opportunity to fully
charge the system, you can use the SOC meter to check when the percentage of
fullness of the batteries charges 1/2 tank reaching 75%. The Curtis fuel
meter will remain at the 1/4 tank level until the 1/2 tank opportunity
charge is used up then the Curtis fuel meter will begin again to show the
use below the 1/4 tank. Also when fully charging the electron tank, the Curtis fuel meter will record full sometime before the charger has completed the finishing stage of the charge cycle. The SOC meter will tell you how close to 100% the charge is and if very close to the 100% you may choose to terminate the charging cycle if necessary to use the vehicle before the low current finishing charge is complete. However to do this you must specify that the SOC meter is ranged for a complete charge. I the case of the 144 Volt system the maximum charge that the traction battery pack can accept is 186 Volts -- this is the top of the finishing charge. (Once the charge cycle is terminated the traction pack voltage will drop very quickly to 156 to 158 volts. The low end of the meter is not very useful. I have spec'd my SOC meter at 140 Volts at the low end. This is the 80% discharge point. This point is never reached if you use the Curtis fuel meter as your dynamic gauge because the Curtis fuel meter will find that point for you and much more reliably.
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| Curtis Fuel Meter 144 Volt | See Above Also. The Curtis 144 Volt Fuel Meter indicates a full charge at 156- 158 Volts [with all ten LEDs illuminated]. When the electron tank is 70% empty the second from the bottom LED will flash while the bottom lamp remains solid ON [all other LEDs are OFF]. When the tank is 80% empty both LEDs will flash alternately. |