Grid-Tied vs Off-Grid Solar Cost Calculator
Compare the total upfront and long-term costs of a grid-tied system vs full off-grid solar with batteries.
Grid-Tied vs Off-Grid Solar: What You Need to Know
Who Should Consider Off-Grid?
Off-grid solar makes financial and practical sense when your property is far from existing grid infrastructure and the cost of extending power lines exceeds $15,000–$50,000 or more. Rural homesteads, remote cabins, agricultural properties, and developing-world installations are classic use cases. It also appeals to those prioritizing energy independence regardless of cost.
Why Grid-Tied Systems Win for Most Homeowners
A grid-tied solar system is dramatically cheaper because it does not require a large battery bank — the grid itself acts as free, unlimited backup storage. You produce during the day, use or sell the surplus, and draw from the grid at night. For the vast majority of suburban and urban homeowners, grid-tied delivers the best financial return.
The True Cost of Batteries
Battery banks for off-grid systems are the biggest cost driver. Lithium iron phosphate (LFP) batteries cost roughly $400–$600/kWh of usable capacity. A home needing 2 days of autonomy at 30 kWh/day with 80% DoD needs 75 kWh of battery capacity — that's $30,000–$45,000 just in batteries, plus the oversized solar array to charge them.
Grid Connection Costs
In rural areas, utilities may charge $10,000–$100,000+ to extend grid lines to a new property. Enter this cost in the "Grid Connection Cost" field — if it rivals the battery bank cost, off-grid may actually be the more cost-effective long-term choice for your situation.