Temperature Compensation - Victron energy Blue Smart IP67 Charger 12/7 Manual

5. Storage
The battery voltage is maintained at the configured storage voltage, which is slightly reduced
compared to the float voltage to minimise gassing and extend battery life whilst the battery is
unused and on continuous charge.
6. Refresh
To refresh the battery and prevent slow self-discharge while in storage stage over an extended
period, an 1 hour absorption charge will automatically occur every 7 days (or as configured).
The POWER and STATUS LEDs can be used to determine if the Blue Smart Charger is powered up or
not and the active charge stage; refer to the table below:
LED
Power
(green)
Status
(yellow)

3.2 Temperature compensation

The Victron Blue Smart Charger range will automatically compensate the configured charge voltage
based on ambient temperature (unless disabled or in Li-ion mode).
The optimal charge voltage of a lead acid battery varies inversely with battery temperature;
automatic temperature-based charge voltage compensation avoids the need for special charge
voltage settings in hot or cold environments.
During power up the charger will measure its internal temperature and use that temperature as the
reference for temperature compensation, however the initial temperature measurement is limited to
25°C as it's unknown if the charger is still warm from earlier operation.
Since the charger generates some heat during operation, the internal temperature measurement is
only used dynamically if the internal temperature measurement is considered reliable; when the
charge current has decreased to a low/negligible level and adequate time has elapsed for the
charger's temperature to stabilise.
The configured charge voltage is related to a nominal temperature of 25°C and linear temperature
compensation occurs between the limits of 6°C and 50°C based on the default temperature
compensation coefficient of 16.2mV/°C (for 24V chargers multiply the coefficient by 2) or as
configured.
The temperature compensation coefficient is specified in mV/°C and applies to the entire
battery/battery bank (not per battery cell).
8
State
Illuminated
Off
Fast blinking
Slow blinking
Illuminated
Off
Charge Stage / Description
Power On
Power Off
Bulk
Absorption / Recondition
Float / Power supply mode
Storage / Refresh