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900-0020-01-00 Rev A 25
Conversely, when batteries are warmer than room temperature, the electrolyte reaction is somewhat
hyper-reactive. It takes less energy than usual to charge them. Delivering the full (room-temperature)
amount of energy would overcharge them and can be hard on them over time.
The Radian inverter, when equipped with the Remote Temperature Sensor (RTS) will compensate for
changes in temperature. The RTS is attached to a single battery near the center of the bank, to achieve
a representative temperature. If installed in a multiple-inverter system, only a single RTS is necessary.
It must be plugged into the master inverter and will control the charging of all slaves and all charge
controllers. (See the Radian Series Inverter/Charger Installation Manual for locating the RTS port.) This
process is automatic.
When charging, an inverter system with an RTS will increase or decrease the charge voltage by 5 mV
per degree Celsius per battery cell. This setting affects the Absorption, Float, and Equalization set
points. The Sell Voltage and Re-Float Voltage set points are not temperature compensated. The
Equalization set points are not compensated in OutBack charge controllers.
In a 48 Vdc system (24 cells, 2 volts each), this means 0.12 volts per degree Celsius above or below 25°C.
Maximum compensation is ± 2.4 Vdc.
EXAMPLES:
A 48 Vdc system with batteries at 15°C will compensate its charging to 1.2 Vdc
higher
than the set points.
A 48 Vdc system with batteries at 40°C will compensate its charging to 1.8 Vdc
lower
than the set points.