Project Solar Additional Costs (Adders)
Solar Adders Explained
Our quoting calculator is accurate in most situations, but every solar project is different. In about 20% of jobs there are a unique "adders" that can add cost to the job total.
When purchasing solar it is important to do your research and to know your costs. We do our best to be as transparent as possible by providing upfront quotes without having to talk to a sales person.
Our quoting calculator already includes the base rates below and is based on the address provided. All other prices are NOT already included and would need to be added to your total cost manually. These costs below are listed at full rate, before the federal incentive, so true net cost will be 30% less.
If you are unsure if an adder applies to you, our engineering team will let you know before the contract is signed and before any money is committed.
| Base Install Rate Default State* | $0.50/watt |
| Base Install Rate Exception States (CT,GA,NJ,NY,OR,PA,VA,WA,NC,SC)* | $0.70/watt |
| Site Survey (if you are unable to provide pictures) | $200 |
| Clay Tile Roof | Not supported for Full Install |
| Thin Lightweight Tile (uncommon) | Not supported for Full Install |
| Metal Roof | $0.10/watt |
| Concrete Tile Roof (CA - $0.00) | $0.15/watt |
| Roof Pitch ≥ 35° | $0.15/watt |
| Flat Roof with Ballast Mounts | $0.15/watt |
| Flat Roof with Penetrating Flush Mounts | $0.35/watt |
| Flat Roof Tilt Leg System | $0.35/watt |
| Critter Guard | $0.15/watt |
| Trenching | $15/ft |
| Attic Run | $500 |
| 200A/225A Main Panel Upgrade | ≈ $3,250 |
| 400A Main Panel Upgrade | ≈ $5,000 |
| Main Breaker Derate/Install | $650 |
| Add Subpanel/ Subpanel Relocate | $800 |
| Load Side Tap in New Sub Panel | $750 |
| Meter Service Drop + Meter Upgrade | $2000 |
| Electric Panel Derate | $650 |
| 4 or more arrays | $500 |
| Installer Travel > 100 miles (first 200 miles round trip free) | $5/mile |
| Same Day Install Cancellation | $1000 |
| Under 4kW system size (DIY) | $1,000 |
| Under 4kW system size (full install) | $2,000 |
| Enphase IQ8M Inverter Upgrade | $20/inverter |
| Enphase IQ8A Inverter Upgrade | $30/inverter |
| Enphase IQ 10/10T Battery (with System Controller 2, includes installation) | $13,995 |
| Additional Enphase IQ 10/10T Battery (without System Controller 2, includes installation) | $9,700 |
| Enphase IQ 3/3T Battery (with System Controller 2, includes installation) | $8,495 |
| Additional Enphase IQ 3/3T Battery (without System Controller 2, includes installation) | $3,700 |
| Enphase Sunlight Backup | $5,495 |
| Enphase CT Consumption Meter (pricing assumes factory wiring as sufficient, otherwise adder will be refunded/re-quoted based on additional work required) | $400 |
*Auto included in the Project Solar quoting calculator if applicable.