'Must Know' Features And Facts; Ultra High Efficiency "Green" Battery Charger - Victron energy Blue Smart IP67 12/7 Manual

2. 'Must know' features and facts

2.1 Ultra high efficiency "green" battery charger

With up to 95% efficiency, these chargers generate up to four
times less heat when compared to the industry standard.
And once the battery is fully charged, power consumption
reduces to 0.5 Watt, some five to ten times better than the
industry standard.
2.2 Durable, safe and silent
- Low thermal stress on the electronic components.
- Protection against ingress of dust, water and chemicals.
- Protection against overheating: the output current will
reduce as temperature increases up to 60°C, but the
charger will not fail.
- The chargers are totally silent: no cooling fan or any other
moving parts.
2.3 Reverse polarity protected
In case of wrong polarity connection, the external ATO blade fuse
will blow. Check the polarity of the cable and check the correct
value before replacing the fuse.
2.4 Recovery function for fully discharged batteries
Most reverse polarity protected chargers will not recognize, and
therefore not recharge a battery which has been discharged to
zero or nearly zero Volts. The Blue Smart IP67 Charger however
will attempt to recharge a fully discharged battery with low current
and resume normal charging once sufficient voltage has
developed across the battery terminals.
2.5 Temperature compensated charging
The optimal charge voltage of a lead-acid battery varies inversely
with temperature. The Blue Smart IP67 Charger measures
ambient temperature during the test phase and compensates for
temperature during the charge process. The temperature is
measured again when the charger is in low current mode during
float or storage. Special settings for a cold or hot environment are
therefore not needed.