Specialty Concepts PPC - Manual (Page 9)

T E M P E R A T U R E C O M P E N S A T I O N
DESCRIPTION: - The PPC has a small sensor on a ten foot cable that is wired into the control
to adjust the charging thresholds according to battery temperature. The rate of
compensation is -5mv/
°
C per battery cell in series from 25
°
C.
WHEN NEEDED: - Temperature compensation is recommended for stand alone systems with
sealed batteries, or for systems that have no regular charging source other than PV AND
where prolonged temperature extremes will be experienced during periods of charging.
Temperature extremes would be when the battery will be exposed to average temperatures
below 50
°
F (10
°
C) or above 90
°
F (32
°
C).
CAUTION: SENSOR CABLE: If the sensor is damaged or the cable is cut, the control will no
longer function.
INSTALLATION INSTRUCTIONS
Provision must be made to attach the sensor unit to the battery. This must be done properly to
insure that accurate temperature readings are made. It is important that ambient temperature
not influence the sensor. To minimize this, attach the sensor to the battery as follows:
1. RUN SENSOR TO BATTERIES: Run the sensor to the batteries, taking care to prevent
damage to the actual sensor itself. When pulling the sensor through conduit, do not pull
on the rubber-coated sensor, but instead on the gray cable just behind the sensor. Do not
force the sensor. The sensor itself is made of glass, but it is encased in an aluminum
tube, then coated with plastic. If the tube should pull off of the glass sensor, and if the
sensor is not damaged, the tube can be slipped back over the sensor.
2. ATTACH SENSOR: Use the adhesive sided foam pad (included) to cover the sensor (the
plastic coated unit at the end of the cable) and attach it to the side of the battery
approximately half-way up the side of the battery. Choose a battery that is shielded from
drafts or sunlight by other batteries or by the battery shelter. DO NOT immerse the sensor
directly in the battery's electrolyte, it will be severely damaged. Temperature
compensation of charging voltage is now automatic.