LCEC Solar Gross Rating: Check AC and DC Before Choosing a Tier

Write the equipment inputs before doing arithmetic

Use the actual proposed module and inverter schedule. Record manufacturer, exact model, quantity and nameplate capacity for each group. Keep the supporting manufacturer sheets with the dated proposal. A number in a sales headline is not enough if the equipment schedule behind it is missing or has changed.

Create separate columns for module DC capacity, inverter AC capacity, calculated application rating and estimated annual production. The first three are power quantities in kW; the last is energy in kWh over a year. A system can have several different legitimate numbers because they describe different things. The worksheet should explain which number is used for which decision instead of selecting whichever makes the proposal look most attractive.

Example one: DC capacity exceeds inverter AC output

Hypothetical design A has 24 modules rated at 400 W each and 8 kW of total inverter AC generating capacity. The module total is 24 × 400 ÷ 1,000 = 9.6 kW DC. Since 9.6 is not lower than 8, the stated LCEC method gives an 8 kW gross rating. This is arithmetic using assumed equipment values, not an approved design.

Keep both 9.6 kW DC and 8 kW AC in the comparison. Neither number predicts annual generation on this roof. Ask the designer for the separate production estimate and its inputs. If another proposal uses different modules or a different inverter arrangement, calculate it independently rather than carrying over design A’s result simply because the panel count looks similar.

Example two: DC capacity is lower than inverter AC output

Hypothetical design B has 20 modules rated at 400 W each and 10 kW of total inverter AC generating capacity. Its module total is 8 kW DC. Because 8 is lower than 10, the guideline’s alternate branch gives 8 × 0.85 = 6.8 kW gross rating. Do not use 10 kW merely because it is the larger equipment label.

These examples illustrate the published comparison, not equipment compatibility or permission to install. A qualified designer must establish the relevant nameplate inputs and the proposed architecture. Existing solar, storage or multiple inverter types can make the record more complex. Ask the project professional and LCEC to confirm the appropriate application treatment instead of adding unrelated equipment ratings without explaining what they represent.

Resolve a boundary instead of rounding around it

The participation sheet describes Tier 1 as 0–10 kW, while the online form’s tier selector uses a less-than-10 label and its rating field shows 0–10 kW. [2][3] If the calculated value sits exactly at the boundary, obtain LCEC’s clarification for the application. Do not change an equipment value or round down to make a field accept the submission.

Save the unrounded calculation, equipment evidence and the utility response together. Ask which fee, insurance or additional review requirements apply to the confirmed classification. Keep these questions separate from the installer’s price and from projected electricity savings. A tier label is an administrative classification, not a statement that a design is financially preferable or suitable for every household.

Repeat the check when the proposal changes

Maintain one row per dated design alternative with its module total, inverter total, calculation branch, result and unresolved questions. When a model or quantity changes, ask which application and drawing pages must be updated. A substitution described as equivalent can still leave the previous paperwork describing equipment that will not be installed.

At handoff, retain the final equipment schedule and accepted utility record alongside the earlier comparison history. Future service or expansion discussions should start with what was actually accepted and installed. Origin Direct can help organize competing proposals and identify missing scope, but it cannot replace LCEC’s classification or the designer’s technical review. No calculation here promises a particular bill, payback period or approval date.

Primary sources

1. LCEC: Net Metering Guidelines

   Checked October 16, 2026. LCEC inverter-based gross-rating method. Historical annual credit examples in this document are not current-year payout quotes.

2. LCEC: How to Participate in Net Metering

   Checked October 16, 2026. Published application, supporting-document and operating-authorization sequence. Ask LCEC to resolve boundary or project-specific questions.

3. LCEC: Customer-Owned Renewable Generation Application and Compliance Form

   Checked October 16, 2026. Current member, equipment and storage fields. Confirm account-specific questions with LCEC; do not send account credentials to Origin.

Planning examples and questions are Origin’s editorial guidance, not a property-specific diagnosis, engineering design, tax determination or promise of savings. Manufacturer and utility references do not imply an affiliation with Origin.

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