Hello new to the solar game.

I am in the process of installing the Flexboss21, Grid boss, and 3 indoor wall mount batteries.

I am in New Mexico and working with my local power company. Columbus electric coop for an interconnection agreement of 10KW or less.

They have responded with some questions that I do not know how to answer. I sent to tech support but figured I would post here in the meantime.

Coop Questions.

"Can the customer verify that the inverters' default settings meet the Category III and Category B requirements listed in the Coop TIIR document? These default settings are listed in Tables 2, 3, 5, 7, and 8 of the PDF. I could not find these settings on the manufacturer's website."

(Sorry work computer will not allow me to upload files. Questions Blue, Bold & Underlined below)

New Mexico Cooperative Rule 568 TIIR Rules and Regulations

4.2              Constant Power Factor

This mode shall be disabled unless otherwise specified by the Cooperative. Should this mode be needed, the Cooperative shall specify the target power factor. It shall not require reactive power exceeding the reactive capability requirements.

4.3              Voltage-Reactive Power Control

This mode shall be enabled unless otherwise specified by the Cooperative in Interconnection Agreement.

Table 2 shows the default settings for Category A and Category B. These are default settings for Voltage-Reactive Power Control from IEEE 1547-2018. Vref shall be fixed and this means that it would equal Vn, or nominal voltage.

Table 2: Voltage-Reactive Power Control Default Settings

• - Vn is assummed to be set at DER nominal operating voltage

** - The DER reactive power capability may be reduced at lower voltage

4.4              Voltage-Active Power Control (For Category B, Inverter Based only)

The Cooperative requires the settings for Voltage-Active Power control to be enabled unless

otherwise specified in the Interconnection Agreement.

IEEE 1547-2018 default setting is to disable this mode. The DER equipment may require settings change to enable this feature. Table 3 lists the required settings for this mode unless other specified by the Cooperative.

Table 3: Voltage-Active Power Control Default Setting

• - Pmin is the minimum active power output in per-unit of the DER rating

** - P'rated is the maximum amount of active power that can be absorbed by the DER. Energy Storage System operating in the negative real power half plane, through charging, shall follow this curve if available energy storage capacity permits this operation.

• Active-Reactive Power Control

The Cooperative requires the settings for Active Power-Reactive Power control to be disabled.

• Active-Reactive Power Control

The Cooperative requires the settings for Constant Reactive Power control to be disabled.

5. Abnormal Conditions Performance for Category I and Category III

The Cooperative, Transmission Power Suppler, or Bulk Power System may have abnormal conditions on the system occur for which the DER shall appropriately respond. The Cooperative requires the settings for Voltage Disturbance Ride-Through and Frequency Disturbance Ride-Through to be enabled.

Category I performance requirements of IEEE 1547-2018 for abnormal conditions must be met by rotating generating facilities DER. Abnormal voltages are detailed in Tables 11 and 14 and Figures H.7 to H.9 of IEEE 1547-2018. Abnormal frequencies are detailed in Tables 18 and 19 and Figure H.10 of IEEE 1547-2018

Category III performance requirements of IEEE 1547-2018 for abnormal conditions must be met

by inverter-based DER.

Abnormal voltages are detailed in Tables 13 and 16 and Figures H.7 to

H.9 of IEEE 1547-2018. Abnormal frequencies are detailed in Tables 18 and 19 and Figure

H.10 of IEEE 1547-2018.

The voltage and frequency ride through requirements specified in this section do not apply and the DER may cease to energize the Cooperative and trip without limitations, if the exceptions apply per IEEE 1547-2018 Section 6.4.2.1 and 6.5.3.2.

5.1              Abnormal Voltages

5.1.2        Category III (Inverter-Based DER)

This type of DER shall trip for the voltage conditions in accordance with Table 5.

The DER shall ride-through consecutive temporary voltage disturbances in accordance with IEEE 1547-2018 Section 6.4.2.5 requirements for Category III DER.

5.2.2        Category I (Inverter-Based DER)

This type of DER shall trip for the voltage conditions in accordance with IEEE 1547-2018 Table 18 default settings for Category III, shown in Table 7.

All inverter-based DER shall comply with the rate of change of frequency ride-through performance requirements per IEEE 1547-2018 Section 6.5.2.5. All inverter-based DER shall comply with the voltage phase angle changes ride-through requirements per IEEE 1547-2018 Section 6.5.2.6. Inverter-based DER shall operate with a frequency droop during both low-and high frequency conditions per IEEE 1547-2018 Table 22. Inverter-based DER shall comply with the frequency droop operating parameters per IEEE 1547-2018 Table 24 default settings, as shown in Table 8.