Battery Charger - Victron energy MultiPlus 12/3000/120 – 50 Manual

Programmable relay
The MultiPlus is equipped with a multi-functional relay that by default is programmed
as an alarm relay. The relay can be programmed for all kinds of other applications
however, for example to start a generator.
Programmable with DIP switches, VE.Net panel or personal computer
The MultiPlus is supplied ready for use. Three features are available for changing
certain settings if desired:
- The most important settings (including parallel operation of up to three devices and
3-phase operation) can be changed in a very simple manner, using DIP switches.
- All settings, with exception of the multi-functional relay, can be changed with a
VE.Net panel.
- All settings can be changed with a PC and free of charge software, downloadable
from our website www.victronenergy.com

2.2 Battery charger

Adaptive 4-stage charge characteristic: bulk – absorption – float – storage
The MultiPlus 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.
Preventing damage due to excessive gassing: the BatterySafe mode
If, in order to quickly charge a battery, a high charge current in combination with a
high absorption voltage has been chosen, the MultiPlus will prevent damage due to
excessive gassing by automatically limiting the rate of voltage increase once the
gassing voltage has been reached
Less maintenance and aging when the battery is not in use: the Storage mode
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 2,2V/cell (13,2V for
12V battery) to minimise 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.
4