1 of 8

Acrel Meter Relocation and CT Bundling

2 of 8

1

All Home Integration Systems (HIS) require monitoring using a Acrel meter and current transformers

2

Current is transferred to the CT’s through an electromagnetic field that occurs where the high current conductor passes through the CT. The CT then provides a lower ratio output current that is proportional to the high current conductor. This low current flows through smaller conductors downstream to the Acrel meter. By doing this, the meter can measure the high AC current value

Acrel Meter & Current Transformers (CT’s)

3 of 8

1

Both Acrel meter and CT’s come pre-installed within the MID

2

The Acrel meter (bottom right) is installed on a piece of din rail. CT’s come installed and zip tied around the busbars (upper left)

3

To prevent relocating the Acrel meter, MID must be installed within 8’ of the MSP so CT’s can fit around the homes main conductors (CT’s can’t be extended past factory length)

Pre-Installed Acrel & CT’s

4 of 8

1

If the MID can’t be installed close to MSP, remove the Acrel meter from the MID and install it into a separate j-box close to MSP

2

On the bottom right of the circuit board (#1), RS485 comm wire will be ran to the Acrel meter in the j-box

3

An additional RS485 wire (#2) will be ran to the Delta BID inverter

Relocating The Acrel Meter

#1

#2

5 of 8

1

L1 and L2 CT’s are installed on the correct phase at the main service point

2

L1 and L2 CT’s leads are installed on the correct phase at the electricity meter

3

A 15A - 240V circuit is landed on the correct phases powering the meter

4

L1 and L2 conductors are landed on the correct phase at the circuit breaker termination.

5

L1 and L2 conductors are landed on the correct phase at the consumption meter termination.

Relocating The Acrel Meter

6 of 8

Bundling

1

If one and/or both CT’s can’t fit around the “main service conductors” (not the subpanel), bundling of circuit wires will be required

2

Identify all L1 and L2 loads connected to the Main Service Panel and group them with the correct CT phase

3

Some installations will require an additional set of CTs parallelled together to capture all of the loads in the panel

4

Evenly distribute circuits into groups that allow all conductors to fit

Maximum two sets of CT’s per Acrel meter

7 of 8

1

This video shows a relocated Acrel meter for reference

Relocated Acrel Meter Video

8 of 8

Thank You