Victron energy MultiPlus 12/500/20 Manuel page 15

Ground relay (see appendix B)
With this relay (H), the neutral conductor of the AC output is grounded to the chassis when
the back-feed safety relay is open. This ensures the correct operation of earth leakage
circuit breakers in the output.
If a non-grounded output is required during inverter operation, this function must be turned
off.
(Use VE-Configure)
The standard setting is 'Four-stage adaptive with BatterySafe mode'. See Section 2 for a
description.
This is the recommended charge curve. See the help files in the software configuration
programs for other features.
Battery type
The standard setting is the most suitable for Victron Gel Deep Discharge, Gel Exide A200,
and tubular plate stationary batteries (OPzS). This setting can also be used for many other
batteries: e.g. Victron AGM Deep Discharge and other AGM batteries, and many types of
flat-plate flooded batteries. Four charging voltages can be set with DIP switches.
Automatic equalisation charging
This setting is intended for tubular plate traction batteries. During absorption the voltage
limit increases to 2,83V/cell (34V for a 24V battery) once the charge current has tapered
down to less than 10% of the set maximum current.
Absorption time
The absortion time depends on the bulk time (adaptive charge curve), so that the battery is
optimally charged. If the 'fixed' charging characteristic is selected, the absorption time is
fixed. For most batteries, a maximum absorption time of eight hours is suitable. If an extra
high absorption voltage is selected for rapid charging (only possible for open, flooded
batteries!), four hours is preferable. With DIP switches, a time of eight or four hours can be
set. For the adaptive charge curve, this determines the maximum absorption time.
Storage voltage, Repeated Absorption Time, Absorption Repeat Interval
See Section 2.
Bulk Protection
Default setting: off. When this setting is 'on', the bulk charging time is limited to 10 hours. A
longer charging time could indicate a system error (e.g. a battery cell short-circuit).
AC input current limit
These are the current limit settings at which PowerControl come into operation. The factory
setting is 12A.
UPS feature
If this setting is 'on' and AC on the input fails, the Multi switches to inverter operation
practically without interruption. The Multi can therefore be used as an Uninterruptible Power
Supply (UPS) for sensitive equipment such as computers or communication systems.
The output voltage of some small generator sets is too unstable and distorted for using this
setting* – the Multi would continually switch to inverter operation. For this reason, the setting
can be turned off. The Multi will then respond less quickly to AC input voltage deviations. The
switchover time to inverter operation is consequently slightly longer, but most equipment
(most computers, clocks or household equipment) is not adversely impacted.
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