© 2010 Magnum Energy, Inc.
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3.0 Setup
Example:
The standard rate on your power bill is $.10 kWh. Your utility
company offers $.08 KWH between 12:00 AM and 7:00AM. Set your
connect time to coincide with the utility company’s lower rates in order
to save money when using utility power to charge the batteries.
02D AC In VDC:
The
AC In VDC
setting determines when the inverter/
charger connects to incoming AC based on VDC (battery voltage).
AC In
VDC
is set within a range of battery voltages; the
fi
rst being the connect
DC voltage at which the inverter/charger will connect to incoming AC, and
the second being the disconnect DC voltage at which time the inverter
will disconnect from incoming AC. This setting is used when an alternate
charging source(s) is present. The alternate charging sources may be
PV, wind, and/or hydro. Typically, the
AC In VDC
setting optimizes the
alternate charging source(s) and only uses the grid to charge the batteries
if the alternate charging source is not able to maintain the batteries above
the
Set Connect Volts
setting.
Default setting
-
11 - 14.1 VDC (12v), 22 - 28.2 (24v), 44 - 56.4 (48v)
What is the AC In VDC feature?
This feature allows the incoming AC to
connect to the inverter/charger and charge the batteries once the set voltage
value in the
02D AC In VDC
menu is reached. Even if AC is present on the AC
input terminals of the inverter/charger, it will only connect to incoming AC
when the
Set Connect Volts
setting is reached. It will disconnect when the
Set Disconnect Volts
voltage setting is reached.
Should I use the AC In VDC feature?
The most common use of
AC In VDC
is
when you have an alternate source(s) of battery charging. The most common
sources of alternate battery charging are PV, wind, and/or hydro. These sources
are directly connected to the batteries via a charge controller. In order to
optimize the alternate charge source(s), the incoming AC must be prevented
from connecting to the inverter/charger or else the inverter/charger will take
over charging the batteries and the alternate source will not be used.
Where should I set AC In VDC?
Check with your battery manufacturer
or installer in order to determine the correct settings for your batteries.
Typically, battery manufacturers don’t recommend discharging the batteries
below 50%, which when related to a voltage setting is approximately 12.0-
12.2 VDC, 24.0-24.4 VDC and 48-48.8 VDC for 12, 24 and 48 volt battery
systems respectively.
Example:
In order to protect the batteries from over-discharging, set
the connect voltage at 12.2 VDC, 24.4 VDC, or 48.8 VDC respectively. If
the alternate charge source cannot keep the battery charged, then the
grid will connect at 12.2 VDC and charge the batteries. You would set
the disconnect voltage at the Absorb voltage for your batteries to make
sure the batteries received at least a 75-80% charge before the AC is
disconnected.
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