Use this guide to configure System Expansion projects in Solargraf and review how Departing Load Charges are reflected in utility bill estimates.

Select System Expansion

• Create a new project and enter the project address.
• Under System type, select System Expansion.
• Choose the appropriate design mode.

Configure the utility and tariffs

• Select the applicable utility, such as PG&E, SCE, or SDG&E.
• Select the customer’s current solar tariff.
• Select the applicable New System Tariff for the expansion system.
• For a non-export expansion system, set the Power Export Limit (PEL) to 0.

Note: The selected tariff and export configuration determine how Solargraf models the post-expansion utility bill. Confirm the settings against the customer’s utility documentation before finalizing a proposal.

Enter consumption and existing production

• Under Electricity bills & consumption, enter the customer’s total household consumption.
• Include both electricity imported from the grid and energy produced by the existing solar system and consumed on site.
• Enter the existing PV system’s production details using available monthly or annual data, or import the data through an available integration.

Design the expansion system

• Add the expansion PV array, battery, or both in the design tool.
• Confirm that the design reflects the intended non-export configuration.
• Save the design and review the resulting utility bill estimate.

Review Departing Load Charges

For supported System Expansion configurations, Solargraf calculates the departing load and applies the applicable utility charge automatically. No separate manual DLC field is required.

In the Webquote or proposal:

• Navigate to the monthly performance analysis.
• Review the post-solar bill calculation.
• Locate the Fixed Charges line.
• Confirm that the applicable Departing Load Charge is included in the fixed-charge amount.

Note: Departing Load Charges are modeled as utility charges and are not offset by solar export credits. Actual utility billing may vary based on the customer’s tariff, approved interconnection configuration, and utility rules.