$27,000 Solar System in Ohio, No Federal Tax Credit: Payback Ranges From 12.7 to 18.4 Years, and Cash, Loan, and PPA Rank Differently
Say your neighbor just got a $27,000 quote for an 8 kW rooftop system. The installer's one-pager says "pays for itself in 8 years." You live in Ohio, the 30% federal credit for homeowner-purchased systems ended for spending after December 31, 2025, and that quote assumes a rate increase your utility hasn't filed.
Run it with realistic inputs and the answer isn't 8 years. It's somewhere between 12.7 and 18.4 years, and the spread comes from a handful of assumptions you can check yourself.
This week's solar headlines make a good backdrop. U.S. cumulative capacity is nearing 300 GW, a federal court restored a $7 billion low-income solar program, Ohio's largest solar-plus-storage project finally got its permit, and plug-in solar kits are getting safety certification. Each one nudges a piece of your math. None of them replaces it.
What This Week's Headlines Change (and Don't) for Your Payback
Solar capacity at 299.4 GW. PV Magazine USA reports that cumulative U.S. solar hit 299.4 GW, with a 45% year-over-year jump in Q2 driven by utility-scale additions. That's good news for supply. But your retail bill also pays for wires, poles, and service, so more solar on the grid doesn't automatically lower your rate. Treat it as one input to your escalation assumption, not a reason to lower it.
Oak Run in Ohio. The Ohio Power Siting Board approved a permit for Oak Run Solar in Madison County: 800 MW of solar with 300 MW of battery storage, after years of legal and regulatory fights. For scale, 800 MW is the nameplate equivalent of about 100,000 rooftop systems the size of the one in this post. It tells you Ohio's grid is adding supply. It says nothing about what your utility will charge next year.
Solar for All. A federal judge ruled that the EPA's termination of the $7 billion program was unlawful. If your household qualifies as low-income, hold off signing a market-rate contract until you know what your state's program offers. A ruling can still be appealed, so I wouldn't count on a specific dollar amount yet. Ask.
Plug-in solar. Mango Power is now the third company with a plug-in solar product certified to the UL 3700 outline of investigation, and Bright Saver's $300,000 crowdfunding campaign has hit its first goal. I'll model this below because it changes who can afford to start.
Logistics. Solar Power World notes that third-party logistics companies are adapting to new product designs and packaging. Freight and handling get baked into your quote. Ask for equipment, freight, labor, and permitting broken out as separate lines.
The Worked Example: 8 kW in Ohio, $27,000 Cash, No Federal Credit
I'm using round planning inputs, not exact figures for your ZIP. They fall within the ranges you'd see in EIA state residential price data and NREL PVWatts output.
- System: 8 kW at $27,000 ($3.375 per watt)
- Production: 1,200 kWh per kW per year, so 9,600 kWh in year 1 (good south-facing roof, little shade)
- Value of each kWh: $0.16 (the blended price of power you use plus power you send back)
- Year-1 savings: 9,600 × $0.16 = $1,536
- Panel degradation: 0.5% per year
- Federal credit: none
- Excluded: a mid-life inverter replacement, which I'd budget at about $2,500 around year 12 to 15
The last input to choose is how fast your utility rates rise. Small changes here compound over 25 years.
| Utility rate escalation | Payback (cash) | 25-year net savings, undiscounted |
|---|---|---|
| 0% per year | 18.4 years | +$9,200 |
| 2% per year | 15.7 years | +$19,100 |
| 4% per year | 14.0 years | +$32,700 |
| 6% per year | 12.7 years | +$51,200 |
Look at the bottom two rows against the top two. Going from 2% to 6% escalation is a $32,100 swing on the same panels, same roof, same contract. Subtract about $2,500 for the inverter to get the real net.
If you've seen "8-year payback" advertised, check the escalation and the value-per-kWh assumption. Ours would need something like a 6% escalator and a higher rate than Ohio's to get anywhere close. My post on solar payback at 2% vs. 6% utility rate escalation goes deeper on how to pick a defensible number.
What Your Roof Does to This
Now the roof. Say yours has a chimney shadow and an east-west split, and production is 15% lower: 8,160 kWh instead of 9,600. Year-1 savings fall to $1,306, and payback at 4% escalation stretches from 14.0 years to 15.8 years. A shading problem costs you nearly two years before anyone has argued about financing.
This is the kind of analysis Elovane runs for you. Our dataset is 10,850 rows across seven sources, including NREL county solar data (6,287 rows), EIA state electricity prices (3,672 rows), NREL system cost benchmarks, and DSIRE incentive programs. It lets the tool swap in your ZIP's actual production and rate instead of my round numbers.
Cash vs. Loan vs. PPA on the Same $27,000 System
Same 8 kW system, same 4% utility escalation. I'm comparing three ways to pay:
- Cash: $27,000 upfront.
- Loan: $27,000 at 7.5% APR over 15 years, about $250 per month ($3,004 per year), $45,054 total paid.
- PPA (power purchase agreement): you pay the installer for each kWh the panels make instead of buying the system. Assume $0.13 per kWh with a 3.5% annual escalator, 25 years, nothing down.
| Cash | Loan (7.5%, 15 yr) | PPA ($0.13, 3.5% escalator) | |
|---|---|---|---|
| Upfront | $27,000 | $0 | $0 |
| Year-1 cash flow | +$1,536 | −$1,468 | +$288 |
| Break-even | 14.0 years | 20.6 years | Positive from year 1 |
| 25-year net, undiscounted | +$32,700 | +$14,600 | +$14,300 |
| NPV at 5% discount rate | +$3,900 | about −$300 | +$7,100 |
(NPV, or net present value, discounts future savings to today's dollars. It asks: is this better than what you'd earn on that money elsewhere?)
Three things stand out.
The loan never turns cash-flow positive during its own term. The $250 monthly payment is about $1,470 a year more than the $1,536 in year-1 savings would cover once the payment is annualized. Savings would need to reach $3,004 to match your payment, and at 4% escalation that takes about 20 years. Loan interest alone is $18,054, and that's the gap between the loan's $14,600 net and cash's $32,700.
Cash wins on raw dollars, but PPA wins on NPV. This surprised me the first time I ran it. With no federal credit for buyers, the $27,000 you spend upfront has to be recovered before you gain anything, and money tied up for 14 years is worth less than money received over time. At a 5% discount rate the PPA looks better. At a lower discount rate (if you'd otherwise earn 3% on that cash), cash catches up. The ranking depends on what your alternative use of $27,000 is.
A PPA is only as good as its escalator and terms. At a 6% escalator instead of 3.5%, most of the PPA's advantage disappears. Also read what happens if you sell the house, what the buyout price is, and who pays for a roof repair that requires removing panels. Third-party providers may still qualify for federal credits under different rules than homeowners, which is part of why their pricing can look good. Ask them directly what they're claiming.
For the wider comparison, including lease and prepaid options, see my solar loan vs. lease vs. cash breakdown. You can also model it for your specific situation at Elovane, using your quoted price, your loan APR, and the PPA's real escalator.
The Same Roof in Ohio, Texas, and California
Here's what happens to the same $27,000, 8 kW system when I change only the state's production, retail rate, and export rules. The blended values are illustrative assumptions about how much of your solar you use yourself versus send back to the grid.
| Ohio | Texas | California (NEM 3.0) | |
|---|---|---|---|
| Annual production | 9,600 kWh | 12,000 kWh | 12,800 kWh |
| Blended value per kWh | $0.16 | $0.12 | $0.20 |
| Year-1 savings | $1,536 | $1,440 | $2,560 |
| Payback at 0% escalation | 18.4 yrs | 19.6 yrs | 10.8 yrs |
| Payback at 4% escalation | 14.0 yrs | 14.7 yrs | 9.1 yrs |
Texas gets 25% more sun than Ohio and still pays back slower, because retail rates are lower and export compensation is thin. California produces more than either and pays back fastest, because the retail rate is high enough to cover the weak export rate. Sun hours alone don't predict solar payback. Your rate and your export rules do.
That's why the state-by-state net metering guide matters before you look at any panel spec sheet. And if your utility charges time-of-use or demand-based rates, the picture shifts again, as I walk through in how your rate structure decides payback without the ITC.
What Plug-In Solar Does to the Math
Plug-in solar is a small set of panels (typically hundreds of watts, not eight kilowatts) that connects through an ordinary outlet. UL 3700 is the safety-certification outline these products are being tested against, and Mango Power's certification makes it the third company to announce one.
The articles confirm certification and a crowdfunding milestone. They don't give me a price, so I'm using a placeholder. Assume 800 W of panels at a hypothetical $1,600 installed ($2.00 per watt), producing about 816 kWh per year in Ohio after an orientation derate:
- Year-1 savings: 816 kWh × $0.16 = $131
- Payback at 0% escalation: about 12.3 years
- Payback at 4% escalation: about 10.4 years
Two things make this interesting. The cost per watt is lower, since there's no roofer, no electrician for a panel upgrade, and less permitting. And because a small system sits well below your household's baseline load, nearly everything it makes gets used in your own home at the full retail rate. Export credit policy barely matters. That's the opposite of the big rooftop system, where the export rate can decide the whole deal.
The tradeoffs: $131 per year isn't going to change your budget, and certification is about safety. Whether you can legally plug one in depends on your state, your utility's interconnection rules, and your landlord or HOA. Verify all three before buying. And a crowdfunding campaign carries delivery risk that an installed system doesn't, so read the refund terms.
If Your Household Might Qualify for Solar for All
The court decision on the $7 billion program is good news for low-income households, but a ruling isn't money in your account. If you might qualify, check with your state energy office before signing a market-rate loan or PPA. Signing first can rule you out of a program with better terms. Then run the same payback math with the program's numbers.
Before You Sign: Six Numbers to Get in Writing
- Itemized quote: equipment, freight, labor, permitting, and inverter separately. Logistics and product changes are shifting these lines.
- Year-1 production estimate, and whether it accounts for your shading and orientation.
- Your utility's actual rate schedule and how it credits exports.
- Your rate escalation assumption, compared with your utility's rate history.
- Loan APR, or PPA rate and escalator, with buyout terms.
- Inverter warranty length, and what replacement costs.
If the installer's payback claim can't be reproduced from those six numbers, it isn't a payback claim yet. For the full method behind the calculations here (NPV, LCOE, and payback), my guide to calculating solar ROI walks through each step.
The Bottom Line
For a $27,000, 8 kW system in Ohio with no federal credit, cash payback is 12.7 to 18.4 years depending on escalation. A loan can stay cash-flow negative for its entire term. A PPA can win on NPV and lose on contract terms. A plug-in kit can pay back in about 10 years at a placeholder price, with very little exposure to export policy. None of those answers transfers to your house until you plug in your own rate, roof, and financing.
That's what Elovane is built for: put in your ZIP, your quote, and your financing terms, and see your payback before you sign anything.
Data behind this post
The figures above are computed from the product's own reference tables, last refreshed 2026-04-15:
- 3,672 rows from eia_electricity_prices
- 51 rows from nrel_solar_irradiance
- 6,287 rows from nrel_county_solar
- 648 rows from nrel_atb_system_costs
- 171 rows from dsire_incentive_programs
- 7 rows from fred_financial_rates
- 14 rows from nrel_solar_defaults
Sources
- Plug-in solar roundup: Mango Power gets UL 3700; Bright Saver kicks off crowdfunding — PV Magazine USA
- Federal court strikes down EPA cancellation of $7 billion Solar for All program — PV Magazine USA
- U.S. solar capacity nears 300 GW, enough to power 50 million homes — PV Magazine USA
- Logistics and transportation trends coming to solar projects soon — Solar Power World
- Ohio’s biggest solar project finally gets permit after long legal limbo — Canary Media