Manual Victron MultiPlus 48 3000 35-50 (page 12 of 164) (English, German, Dutch, French, Swedish, Spanish)

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4.4 Optional Connections

A number of optional connections are possible:

4.4.1 Second Battery

The MultiPlus has a connection for charging a starter battery. For connection see Appendix A.

4.4.2 Voltage Sense

For compensating possible cable losses during charging, two sense wires can be connected with which the voltage directly on the

battery or on the positive and negative distribution points can be measured. Use wire with a cross-section of 0,75mm².

During battery charging, the MultiPlus will compensate the voltage drop over the DC cables up to a maximum of 1 Volt (i.e. 1 V over the

positive connection and 1 V over the negative connection). If the voltage drop threatens to become larger than 1 V, the charging current

is limited in such a way that the voltage drop remains limited to 1 V.

4.4.3 Temperature Sensor

The temperature sensor supplied with the product may be used for temperature-compensated charging (see Appendix A). The sensor is

isolated and must be mounted on the batteries minus pole.

4.4.4 Remote Control

The product can be remotely controlled in two ways.

• With an external switch (connection terminal H, see appendix A). Operates only if the switch on the MultiPlus is set to “on”.

• With a Multi Control panel (connected to one of the two RJ48 sockets B, see appendix A). Operates only if the switch on the

MultiPlus is set to “on”.

Only one remote control can be connected, i.e. either a switch or a Multi control panel.

4.4.5. Programmable relays

The models with 16 A transfer capacity (see section 4) are equipped with one programmable relay that by default is set as an alarm

relay. The relay can be programmed for all kinds of other applications however, for example as a starter relay for a generator.

The models with 50 A transfer capacity are equipped with three programmable relays.

4.4.6 Programmable analog/digital input/output ports

The models with 16 A transfer capacity (see section 4) are equipped with one, and the models with 50 A transfer capacity are equipped

with 2 analog/digital input/output ports.

These ports can be used for several purposes. One application is communication with the BMS of a lithium-ion battery.

4.4.7 Auxiliary AC output (AC-out-2)

Besides the usual uninterruptable output, a second output (AC-out-2) is available that disconnects its load in the event of battery

operation. Example: an electric boiler or air conditioner that is allowed to operate only if the genset is running or shore power is

available.

In case of battery operation, AC-out-2 is switched off immediately. After the AC supply has become available, AC-out-2 is reconnected

with a delay of 2 minutes, this to allow a genset to stabilise prior to connecting a heavy load.

4.4.8 Parallel Connection

The MultiPlus can be connected in parallel with several identical devices. To this end, a connection is established between the devices

by means of standard RJ45 UTP cables. The system (one or more Multis plus optional control panel) will require subsequent

configuration (see Section 5).

In the event of connecting MultiPlus units in parallel, the following requirements must be met:

• A maximum of six units connected in parallel.

• Only identical devices may be connected in parallel.

• The DC connection cables to the devices must be of equal length and cross-section.

• If a positive and a negative DC distribution point is used, the cross-section of the connection between the batteries and the DC distribution point must

at least equal the sum of the required cross-sections of the connections between the distribution point and the MultiPlus units.

• Place the MultiPlus units close to each other, but allow at least 10cm for ventilation purposes under, above and beside the units.

• UTP cables must be connected directly from one unit to the other (and to the remote panel). Connection/splitter boxes are not permitted.

• A battery-temperature sensor need only be connected to one unit in the system. If the temperature of several batteries is to be measured, you can

also connect the sensors of other MultiPlus units in the system (with a maximum of one sensor per MultiPlus). Temperature compensation during

battery charging responds to the sensor indicating the highest temperature.

• Voltage sensing must be connected to the master (see Section 5.5.1.4).

• Only one remote control means (panel or switch) can be connected to the system.

4.4.9 Three-phase operation

The MultiPlus can also be used in 3-phase wye (Y) configuration. To this end, a connection between the devices is made by means of

standard RJ45 UTP cables (the same as for parallel operation). The system (Multis plus an optional control panel) will require

subsequently configuration (see Section 5).

Pre-requisites: see Section 4.4.8.

Note: the MultiPlus is not suitable for 3-phase delta (Δ) configuration.

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Victron MultiPlus 48 3000 35-50 Manual

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