Owner's Guide

BattTempComp
24V: -90–0mV/degC
48V: -180–0mV/degC
-54mV
-108mV/C
Sets the battery temperature compensation for a custom
battery. This setting is the reference that the BTS uses to
adjust the charging voltage when the temperature falls
above or below 25°C. See Charge Controlling on page
23.
See Default Battery Charging Settings on page 67 for default settings for standard
battery types.
NOTICE
EQUIPMENT DAMAGE
Check the battery specifications carefully before changing the settings for bulk, absorption,
float and equalization charging. The charge controller is incapable of determining battery
type and cannot warn against or disallow incorrect settings. Incorrect settings may damage
the battery or shorten battery life.
Failure to follow these instructions can result in equipment damage.
Battery Temperature Compensation
When battery charging voltages are compensated based on temperature, the charge
voltage will vary depending on the temperature around the batteries. Temperature
compensation can be accomplished automatically by using a BTS. The BTS attaches
directly to the side of one of the batteries in the bank and provides precise battery
temperature information. See “Installing the Battery Temperature Sensor” in the Conext
MPPT 80 and MPPT 100 Solar Charge Controller Installation Guide for detailed
instructions on how and where to install the BTS.
If a BTS is installed, the charge controlling process is automatically adjusted for the
battery temperature. The charge controller uses the following coefficients to adjust the
charging voltage
1
:
n Flooded Lead-Acid and Gel-Type Batteries (48 V nominal):
-108 mV per degree Celsius
n Absorbed Glass Mat (AGM)-Type Batteries (48 V nominal):
-84 mV per degree Celsius
If using a BTS, when the battery temperature drops below 25°C (77°F), the regulation
voltage setting automatically increases. When the temperature rises above 25°C (77°F)
the regulation battery voltage setting automatically decreases. The temperature range
where compensation is applied is between 0°C and 50°C. Outside of this temperature
range, the compensation value is clamped at the corresponding value for either 0°C or
50°C.
If a BTS is not installed, configure the charge controller to use one of three temperature
compensated charge settings:
1
For 24 V battery systems, divide these coefficients by two.
Conext MPPT 80 and Conext MPPT 100 Owner’s Guide Configuration
35 This document is for use by qualified personnel 990-6214B