Charleston solar works best when the address, roof, and Rate 5 load shape are treated as one problem
Charleston begins with a boundary question. An address inside the City of Charleston follows the city’s solar guidance and permit center. An unincorporated Charleston County address follows the county building-inspection path. That is not administrative trivia. The city’s rooftop guideline identifies separate solar-panel and electrical permit types for a single-family or duplex project, while the county asks for a notably detailed technical package. The installer needs to identify the actual authority before presenting a single “permit included” number. City of Charleston residential solar guideline.
For a city address, the stated inspection sequence includes Residential Electrical Pre-Power and Service plus Residential Building Final. That creates a straightforward homeowner check. Ask who books each inspection, who is on site for a correction, and what happens if the electrical work, roof work, or plan documents diverge from the approved file. Work that is not ready for a required inspection does not become solar value because it was installed quickly. It becomes rework. Charleston inspection requirements.
The city can approve residential solar applications over the counter in person from 9 a.m. to 4:30 p.m., but that is not a blanket promise. The permit center says approval can be blocked by substantial-improvement issues, preservation easements, or Board of Architectural Review jurisdiction. The right reading is opportunity, not entitlement. A historic-district or otherwise constrained property needs the review question addressed before a crew schedules an installation. Charleston Permit Center information.
Published city fees show why a proposal needs more than one allowance line. The schedule lists a $40 non-refundable application fee for building and trade permits, building fees in the $1,001 to $50,000 valuation range, plan review at 50 percent of the building permit fee where valuation exceeds $1,000, electrical service fees by ampere, and a $100 reinspection. Starting work before permit issuance doubles the fees. These are not a quote for your job. They are evidence that the contractor must own its scope and timing. Charleston building and trade fee schedule.
For a county address, ask for the technical package, not a verbal assurance. Charleston County requires structural analysis of the existing roof, wind and seismic design analysis, a layout with clearances, fastening design to roof members, electrical layout and schematic, and separate building and electrical work values. That is a much more explicit engineering conversation. If the proposal cannot show who produces those documents, the contract is ahead of the project. Charleston County solar permit requirements.
Solar Choice changes the economics from a simple annual-offset conversation into a time-of-use conversation. City-area Dominion Energy South Carolina solar customers use Rate 5, with a $0.42740 daily facilities charge, on-peak energy at $0.29907 per kWh, off-peak at $0.15074, super off-peak at $0.09623, and a $1 monthly DER charge. Summer on-peak is 4 to 8 p.m. from May through September. A system that produces at noon does not automatically cover the 6 p.m. cooking and cooling load. Dominion Energy South Carolina Rate 5.
The Solar Choice rider has boundaries that a quote should state in full: maximum 20 kW AC, a minimum ten-year term, a $13.50 monthly minimum bill, separate banking of on-peak and off-peak excess, and a November payout of accumulated excess at avoided cost. Credits cannot offset the basic facilities charge. This is why a claim that every solar kWh “erases the bill” is plainly wrong. The rider is good source material for an honest forecast, but it will not support a zero-bill promise. Solar Choice rider.
Charleston homeowners should not be offered old program language as if it were available today. The program comparison says NEM 2.0 and NEM 3.0 are closed to new customers, while Solar Choice is the available residential option. It also distinguishes Solar Choice from Buy All / Sell All and Offset-Only arrangements. Before evaluating a savings illustration, ask which option the proposal actually assumes, what two-meter configuration is needed, and whether the plan has included the $100 interconnection application fee noted in the comparison. DESC residential solar program comparison.
The state income-tax credit is substantial enough to deserve precision. South Carolina allows a credit equal to 25 percent of eligible purchase and installation cost, subject to the lesser of $3,500 per facility or 50 percent of the taxpayer’s state liability in the year, with carryforward described in the statute and Department of Revenue material. It cannot be claimed before installation is complete. That is not the same as a cash discount on signing day. Consult a qualified tax adviser before assigning personal tax value to a financing decision. South Carolina Department of Revenue tax-credit guidance.
Do not skip the historic and resilience questions because the roof looks ordinary from the street. Charleston’s preservation context is a real project constraint in certain places, and the city guideline specifically calls out Board of Architectural Review involvement in designated districts. The more durable plan describes what will be visible, where conduit runs, how flashings are handled, and whether any easement or review body applies. Historic rules are not an aesthetic afterthought once equipment has been delivered. Charleston resilience and historic-preservation guidance.
Use a Charleston bid ledger with a city-versus-county authority field, historic-review field, roof engineering field, Rate 5 schedule assumption, Solar Choice term and minimum-bill field, expected on-peak and off-peak exports, tax-credit treatment, interconnection fee, cash price, financing total, and roof or electrical change-order rules. A proposal that survives this ledger is worth a site visit. One that depends on blank cells is not ready for a signature.
Charleston solar is not a generic Southeast purchase. It is a building review and a time-of-use tariff wrapped around a particular roof. Once that is clear, the decision gets calmer. You can compare real scopes instead of reacting to a sales claim that was designed to travel anywhere.