Magnum-energy AC Load Diversion Controller (ACLD-40) Instrukcja Użytkownika Pobierz pdf (Strona 12)

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Introduction

4. Frequency disturbance/shift from the battery-based inverter: When the battery voltage

rises above a maximum setpoint, a battery-based inverter changes its output frequency to cause

the grid-tie inverter to limit the energy from the renewable energy source to the battery.

Disadvantages:

• Generated power from the renewable energy is limited/wasted during the frequency shift.

• Batteries are cycled, not regulated—does not allow the batteries to get properly charged

• The frequency-shift setpoint must be set higher than required to ensure it doesn’t interfere

with normal charging (from the battery-based inverter) or any sell back voltage settings

once the utility power returns

• No temperature compensated regulation while charging

Note

– May not occur if networked to the grid-tie inverter

5. AC diversion driven by DC controlled relays: A battery voltage controlled relay is used

to switch on a dedicated AC diversion load (i.e., space heater, air conditioner, etc.) to consume

any excess power when the battery voltage rises above a maximum setpoint. When the battery

voltage falls to the low setpoint, the dedicated diversion load turns off. If the battery voltage rises

again, this cycle repeats.

Disadvantages:

• Batteries are cycled, not regulated—does not allow the batteries to be properly charged.

• AC diversion loads must be sized to absorb the full output of the renewable energy source

and conﬁ gured to always be on (no temperature or thermostat turn-off control).

• AC diversion loads, when activated, can cause enough AC line drop/disturbance to disconnect

the grid-tie inverter—wasting generated energy.

• No temperature compensated regulation while charging.

6. AC Load Diversion Controller (ACLD-40): When the battery voltage rises above a voltage

regulation setpoint, the ACLD-40 begins to send excess current to a dedicated AC diversion load

to maintain the battery voltage. When the battery voltage falls below the regulation setpoint,

current is no longer sent to the dedicated diversion load.

Advantages:

• Batteries are properly charged/regulated - true three-stage charging to batteries during

power outage.

• Easier to source and size AC diversion loads to absorb the full output of the renewable

energy source.

• Primary AC diversion loads can be conﬁ gured for temperature/thermostat turn-off—primary

loads are not required to always be on.

• AC diversion loads are isolated from the grid-tie inverter’s output to provide a smooth turn-

on transition—prevents the inverter from disconnecting due to AC line drop/disturbance.

• ACLD-40 communicates with the MS-PAE Series inverter, this provides:

o No confusion or interference trying to coordinate the inverter’s and controller’s setpoints

once the utility power returns—controller uses same charge setpoints as the MS-PAE

Series inverter for regulation.

o Temperature compensated regulation while charging—uses temperature sensor readings

from the MS-PAE Series inverter.

o Information on diverted power and the controller’s status can be displayed using a

remote control.

o Knows when grid power returns—ensures the renewable energy is not being diverted

and is available to be fed back to the utility grid.

• Does not require multiple current sensors and devices—all current ﬂ ow is monitored at the

controller to determine when to divert excess current.

• No AC to DC energy conversion loss when trying to regulate battery voltage—excess power

is regulated on the AC side.

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