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These ports can be used for several purposes. One application is communication with the BMS of a lithium-ion battery.
4.4.4. Voltage sense (connection terminal J, see appendix A)
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-II will compensate the voltage drop over the DC cables up to a maximum of 1 Volt (i.e. 1V
over the positive connection and 1V over the negative connection). If the voltage drop threatens to become larger than 1V, the
charging current is limited in such a way that the voltage drop remains limited to 1V.
4.4.5. Temperature sensor (connection terminal J, see appendix A)
For temperature-compensated charging, the temperature sensor (supplied with the MultiPlus-II) can be connected. The sensor is
isolated and must be fitted to the negative terminal of the battery.
4.4.6. Parallel Connection
Up to six identical units can be connected in parallel. When connecting MultiPlus-II units in parallel, the following requirements
must be met:
• All units must be connected to the same battery.
• A maximum of six units can be 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-II units.
• Place the MultiPlus-II units close to each other, but allow at least 10cm for ventilation purposes under, above and beside the
units.
• It is essential the negative battery terminal between the units is always connected. A fuse or circuit breaker is not allowed.
• UTP cables must be connected directly from one unit to the other (and to the remote panel). Connection or splitter boxes are
not permitted.
• Always interconnect the negative battery cables before placing the UTP cables.
• Only one remote control means (panel or switch) can be connected to the system.
4.4.7. Split-phase and three-phase operation
The MultiPlus-II can also be used in split-phase and 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 (MultiPlus-II plus an
optional control panel) will require subsequently configuration (see Section 5).
Note: the MultiPlus-II is not suitable for 3-phase delta (Δ) configuration
Page 15
MultiPlus-II 12V/24V/48V 3kVA 120V
Installation
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