Magnum Energy AC Load Diversion Controller (ACLD-40) - Manual (Page 35)

©
2015 Sensata Technologies Page 28
Operation
During a utility power interruption, the main household loads are no longer connected and the utility
grid is not able to receive any excess power generated by the renewable energy. This means there
may be more current available than the critical loads can consume, causing this excess current to be
pushed back thru the AC output of the MS-PAE Series inverter into the battery bank (see Figure 3-6).
Relay
PWM
Switch
Grid-Tie
Inverter
ACLD Controller
(Standby)
Renewable
Energy
MS-PAE Series
Inverter
Battery
Bank
Battery
Increasing
Critical
Loads
Utility Not Connected – Excess Current Charging Battery Bank
(Critical AC Loads less than Renewable Energy so battery bank is charging)
Main
Household
Loads
Utility
Grid Power
Secondary
Load
(Not Powered)
Primary
Load
(Not Powered)
MagNet Control
Note: When the utility power is
lost and the MS-PAE Series inverter
is inverting, the ACLD is in Standby
mode and ready to regulate the
charge current to the battery.
Figure 3-6, Utility not Connected - Excess Current Charging Battery Bank
Relay
PWM
Switch
Grid-Tie
Inverter ACLD Controller
(Active)
Renewable
Energy
MS-PAE Series
Inverter
Battery
Bank
Battery
Almost Full
Critical
Loads
Utility Not Connected – Diverting some Power to Primary Load
(ACLD connects primary load to divert some excess current when battery is almost full)
Note: When the battery is almost full,
the ACLD becomes Active and starts
diverting power to the primary load.
Main
Household
Loads
Utility
Grid Power
Secondary
Load
(Not Powered)
Primary
Load
(Powered)
MagNet Control
Figure 3-7, Utility not Connected - Diverting some Power to Primary Load
Since current is now being pushed back thru the AC output of the MS-PAE Series inverter and this is
not the inverter’s normal path to sense incoming current, it is not able to regulate the battery voltage.
To prevent the battery from being over-charged, the PWM switch inside the ACLD becomes active
and starts diverting the excess current to an externally connected primary load (see Figure 3-7).