Adaptive 4-stage charge characteristic: bulk – absorption – float – storage

The Phoenix Charger features a microprocessor controlled ‘adaptive’ battery management system that 

can be preset to suit different types of batteries. The ‘adaptive’ feature will automatically 

optimise the process relative to the way the battery is being used.

The right amount of charge: variable absorption time

When only shallow discharges occur (a yacht connected to shore power for example) the absorption 

time is kept short in order to prevent overcharging of the battery. After a deep discharge the 

absorption time is  automatically increased to make sure that the battery is completely recharged.

With boat owners in mind this adaptive 5-step charger can provide either 30A or 50A of charge to each of three battery banks. Or the Phoenix 

1+1 model provides 3A to the starter-battery, the rest to the ‘house’ bank. 24V models are available with 16A/25A charge. Bluetooth enabled, 

you can monitor the charger and set alarms straight from your phone.

For voltage and temperature compensated charging order a wireless Smart Battery Sense.

Preventing damage due to excessive gassing: the BatterySafe mode (see fig. 2 below)

If, in order to quickly charge a battery, a high charge current in combination with a high 

absorption voltage has been chosen, the Phoenix Charger will prevent damage due to excessive 

gassing by automatically limiting the rate of voltage increase once the gassing voltage has been 

reached (see the charge curve between 14,4 V and 15,0 V in fig. 2 below).

Less maintenance and aging when the battery is not in use: the Storage mode (see fig. 1 & 2 below)

The storage mode kicks in whenever the battery has not been subjected to discharge during 24 hours. 

In the storage mode float voltage is reduced to 2,2 V/cell (13,2 V for 12 V battery) to minimize 

gassing and corrosion of the positive plates. Once a week the voltage is raised back to the 

absorption level to ‘equalize’ the battery. This feature prevents stratification of the electrolyte 

and sulphation, a major cause of early battery failure.

To increase battery life: temperature compensation

Every Phoenix Charger comes with a battery temperature sensor. When connected, charge voltage will 

automatically decrease with increasing battery temperature. This feature is especially recommended 

for sealed batteries and/or when important fluctuations of battery temperature are expected.

Battery voltage sense

In order to compensate for voltage loss due to cable resistance, Phoenix Chargers are provided with 

a voltage sense facility so that the battery always receives the correct charge voltage.

Universal 90-265 V AC input voltage range and also suitable for DC supply 

(AC-DC and DC-DC operation) 

The chargers will accept a 90-400 V DC supply.

Computer interface

Every Phoenix Charger is ready to communicate with a computer through its RS-485 data port. 

Together with our VEConfigure software, which can be downloaded free of charge from Victron's website and the data link MK3-USB (see accessories), all parameters of the chargers 

can be customised.

Learn more about batteries and battery charging

To learn more about batteries and charging batteries, please refer to Victron's book ‘Energy Unlimited’ 

(available free of charge from Victron Energy and downloadable here : download.jpg


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