Manual

EN ES Appendix

Autonomous operation when the grid fails

Houses or buildings with solar panels or a combined micro-scale heating and power plant or other sustainable energy sources have a

potential autonomous energy supply which can be used for powering essential equipment (central heating pumps, refrigerators, deep

freeze units, Internet connections, etc.) during a power failure. A problem is however that grid connected sustainable energy sources

drop out as soon as the grid fails. With a MultiPlus and batteries, this problem can be solved in a simple manner: the MultiPlus can

replace the grid during a power failure. When the sustainable energy sources produce more power than needed, the MultiPlus will

use the surplus to charge the batteries; in the event of a shortfall, the MultiPlus will supply additional power from the battery.

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 charging characteristics: bulk – absorption – float – storage

The microprocessor-driven adaptive battery management system can be adjusted for various types of batteries. The adaptive function

automatically adapts the charging process to battery use.

The right amount of charge: variable absorption time

In the event of slight battery discharge, absorption is kept short to prevent overcharging and excessive gas formation. After deep

discharging, the absorption time is automatically extended in order to fully charge the battery.

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, damage

due to excessive gassing will be prevented 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.

Two DC outputs for charging two batteries

The main DC terminal can supply the full output current. The second output, intended for charging a starter battery, is limited to 4A and

has a slightly lower output voltage.

Increasing service life of the battery: temperature compensation

The temperature sensor (supplied with the product) serves to reduce charging voltage when battery temperature rises. This is

particularly important for maintenance-free batteries, which could otherwise dry out by overcharging.

Battery voltage sense: the correct charge voltage

Voltage loss due to cable resistance can be compensated by using the voltage sense facility to measure voltage directly on the DC bus

or on the battery terminals.