Installation Manual: 22.8kWh

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4.5.3 – AC System Bonding

Multiple AC Neutral-to-Ground Bonds

Verify that only one neutral-to-ground bond exists in the system. Having more than one neutral-to-ground

bond in a system violates local electrical codes, may create a shock or fire hazard, and may cause some sensitive

equipment to malfunction. The Sol-Ark’s neutral busbar accepts wire sizes up to 4 AWG.

Failure to follow these instructions can result in death or serious injury and will void the Warranty.

System bonding refers to connection (bonding) of one of the current-carrying conductors of an electrical

system to ground. This creates a "grounded conductor" or "neutral" that is at ground potential but is separate

from the equipment ground conductor. System bonding must be done at only one location. Procedures for

system bonding vary between on-grid and off-grid systems.

System bonding for on-grid systems

The Sol-Ark does not include a connection between neutral and ground. The AC input neutral is already bonded

to ground by the incoming utility grid system. Do not connect the neutral to ground in any additional location.

The Sol-Ark does not switch or disconnect the AC neutral in any mode of operation, so even in invert (back-up)

mode, the inverter load sub-panel neutral is bonded to ground by the utility grid system. It must not be

grounded again in the inverter’s load sub-panel.

System bonding for off-grid systems

In a system without a generator, or with a generator that does not provide a grounded neutral, you must make

the connection from neutral to ground in the Essential Loads panel (the inverter’s load sub-panel), which is

actually the home’s main house breaker panel in an off-grid system.

In a system with a generator that provides a grounded neutral, no additional connection from neutral to ground

is needed. In this case, do not connect neutral to ground in the Essential Loads panel (the inverter’s load sub-

panel).

4.5.4 – Making DC Connections

The Sol-Ark contains two built-in MPPT charge controllers, each containing two solar PV input ports (for a total

of four PV string input ports per Sol-Ark). Adhere to the relevant Sol-Ark model’s charge controller

specifications when sizing the paired solar PV array (explained further in this section of the Manual).

CAUTION: All solar PV strings wired to the same charge controller must be rated at the same voltage.

1. Before connecting the solar PV, verify the cable polarity and mark the cable accordingly as Positive or

Negative.

2. The AccESS Sol-Ark is equipped with multiple knockouts (see Figure 16.0 on the following page). Utilize

any one of these to feed the PV wiring from the PV disconnect into the AccESS enclosure.

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