Magnum Energy Series Stacking Cable Kit (ME-SSI) - Manual (Page 24)

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2010 Magnum Energy, Inc.
After the series stacked pair is in Charge mode, the remote will
show “Charging” and begin to sample the battery voltage. If the
voltage is 26.0 or above, the units will go into “Float Charging”
mode. If the battery voltage is below 26.0, they will go into “Bulk
Charging” mode. It is possible that if the battery voltage is close
to the 25.8-26.0V threshold, one charger may go to fl oat while the
other may go to Bulk Charge mode.
The stacked pair of chargers work independently of each other,
and because of this, there can be some voltage regulation interac-
tions. To handle this, the charge voltage regulation routine while
stacked will sample twice as much as usual. This may mean that
the chargers may take a minute or two before charge current is
actually seen, once AC input is fi rst applied. Once charging has
started — because they are independent chargers — they may not
share the charge current evenly, but will individually provide cur-
rent to the batteries up to their maximum current rating, which is
the maximum Charge Amps or Input/Shore Amps setting, which-
ever is less. Any power required for battery charging will be in
addition to any AC loads being powered while AC input is present
to the inverters.
Info: During Bulk Charging, both inverters will attempt
to balance the total current provided to the batteries.
During Absorption or Float Charging the current will
differ.
While in Charge mode, if either unit senses a loss of AC input
power, both units will transfer from Charge to Inverter mode. Once
this transfer is made, 120VAC is available from each individual
inverter and 240VAC is available across the HOT OUT terminals of
the stacked pair.
Charger settings – If a remote control is used, care should be
taken to insure that battery charger settings are the same for both
inverter chargers. Without a remote control, the default settings
on each unit will be coordinated. If you are using a remote control,
then check that the Adj Charge Rate, Adj Batt AmpHrs, Adj Bat-
tery Type, and Adj VAC Dropout settings on the two units are the
same.
Charging with a generator – If you manually start a generator
and use it as the AC source to charge the inverter batteries, you
should be aware that because both inverters will be charging the
same battery, one may taper off fi rst and fi nish the Bulk Charge
stage before the other. When one inverter has reached the Float
Charge stage (after both units were charging in the Bulk Charge
stage), then it is best to turn off the generator; running a genera-
tor to only fl oat charge your batteries is very ineffi cient and if pos-
sible, should be avoided.
Operation
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