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Your NJ solar system should produce 1,200-1,350 kWh per kW per year. If it does not, who pays? Learn how to evaluate production guarantees, spot red flags in fine print, and protect your SREC-II/ADI income stream.
Quick Answer
A solar production guarantee ensures your system generates a minimum amount of electricity annually. In NJ, expect 1,200-1,350 kWh per kW per year depending on location and shading. Look for guarantees that reimburse at your utility rate (not wholesale), cover at least 10 years, and include panel-level monitoring to detect underperformance.
A solar production guarantee is a contractual promise from your installer that your system will generate a specific minimum number of kilowatt-hours (kWh) per year. If actual production falls below that number, the installer compensates you financially.
This is fundamentally different from equipment warranties. A panel manufacturer warrants that each panel will not degrade faster than a specified rate (typically 0.25-0.5% per year over 25 years). An inverter manufacturer warrants that the hardware will function for 12-25 years. But neither manufacturer warrants that your complete system -- panels plus inverters plus wiring plus mounting -- will produce a specific amount of electricity.
That system-level commitment comes from your installer, and in NJ, it is critically important for two reasons:
Not all guarantees are created equal. Understanding the difference prevents unpleasant surprises when your system underperforms.
Coverage: Panel degradation below rated output
Duration: 25-30 years
Provider: Panel manufacturer (e.g., Silfab, REC, QCells)
Limitations: Only covers the panel itself. Does not cover system-level underperformance from shading, wiring, inverter issues, or design errors.
NJ Note: Claim process goes through the manufacturer, not your installer. Shipping and labor for replacement may not be covered.
Coverage: Inverter hardware failure
Duration: 12-25 years
Provider: Inverter manufacturer (e.g., Enphase, SolarEdge)
Limitations: Covers hardware replacement only. Does not cover production losses during downtime or system design issues causing inverter underperformance.
NJ Note: Enphase microinverters have 25-year warranty. String inverters from SolarEdge have 12-year standard (extendable to 25). Longer is better for NJ ADI income protection.
Coverage: Total system kWh output over a defined period
Duration: 10-25 years (varies widely)
Provider: Your solar installer
Limitations: Strongest guarantee type. If your system produces less than the guaranteed amount, the installer pays the difference. Terms, exclusions, and payment methods vary significantly between companies.
NJ Note: Critical for NJ because underproduction directly reduces your SREC-II/ADI income. A 10% production shortfall on a 10 kW system costs about $76/year in lost ADI revenue alone, plus $200+ in additional electricity purchases.
Coverage: System uptime and monitoring alert response
Duration: Varies
Provider: Your solar installer
Limitations: Guarantees that the system is monitored and issues are flagged within a defined timeframe (e.g., 24-48 hours). Does not guarantee production levels.
NJ Note: Important but not sufficient on its own. Monitoring catches failures quickly but does not compensate for design-related underperformance.
Solar production in NJ varies by location due to latitude, elevation, tree coverage, and proximity to the coast. These ranges represent properly designed and installed systems with south-facing orientation and minimal shading.
| County | Expected kWh/kW/Year | Notes |
|---|---|---|
| Bergen | 1,210-1,280 | Northern NJ, moderate shading from trees |
| Burlington | 1,250-1,330 | South NJ, excellent sun exposure |
| Camden | 1,240-1,320 | South NJ, strong production |
| Essex | 1,200-1,270 | Urban, potential shading from nearby structures |
| Hudson | 1,190-1,260 | Urban density, building shade common |
| Mercer | 1,230-1,310 | Central NJ, good exposure |
| Middlesex | 1,220-1,300 | Central NJ, mixed terrain |
| Monmouth | 1,250-1,340 | Shore proximity, less tree shade, coastal haze |
| Morris | 1,200-1,280 | Hilly terrain, heavy tree cover possible |
| Ocean | 1,260-1,350 | Best in NJ -- flat, minimal shade, shore sun |
| Passaic | 1,190-1,270 | Northern NJ, mountainous sections |
| Somerset | 1,220-1,300 | Central NJ, suburban, moderate shade |
| Union | 1,210-1,290 | Suburban mix, variable shade |
| Atlantic | 1,260-1,350 | South shore, excellent sun hours |
| Cape May | 1,270-1,350 | Southernmost NJ, highest irradiance |
Important:These ranges assume optimal conditions (south-facing, 20-30 degree tilt, minimal shading). East/west orientations reduce production by 10-15%. Significant tree shading can reduce production by 20-40%. Your installer's shade analysis should factor these into your specific production guarantee number.
A production guarantee is a safety net. A well-designed system is the trapeze act itself. The best guarantee is one you never need to use because your system was designed correctly from the start.
In NJ, common design errors that cause underperformance include:
Before evaluating a production guarantee, evaluate the system design. Ask your installer to walk through their shade analysis, string design, wiring plan, and production model assumptions. A company confident in their design will offer a strong guarantee because they know the system will perform.
An estimate is a prediction. A guarantee is a financial commitment. If the document says "estimated annual production" rather than "guaranteed minimum annual production," it is not a real guarantee.
If your system underproduces by 1,000 kWh and they reimburse at $0.04/kWh (wholesale) instead of $0.18/kWh (PSE&G retail), you receive $40 instead of $180. Always check the reimbursement rate.
Some guarantees exclude so many scenarios that they are effectively worthless. NJ experiences nor'easters, hurricanes, and grid outages -- if these are all excluded, the guarantee only covers perfect conditions.
In NJ, solar production directly determines your ADI income ($85.00/MWh). If the system underperforms, you lose SREC-II revenue. A strong guarantee compensates for lost ADI income, not just lost electricity.
Production guarantees shorter than 10 years suggest the company does not expect to honor them. NJ ADI income runs for 15 years. Your guarantee should cover at least that period.
Some guarantees require you to hire an independent engineer to verify underperformance before the claim is considered. This can cost $500-$1,500 and discourages legitimate claims.
All solar panels degrade 0.25-0.5% per year. A proper guarantee accounts for this: year 1 production is higher than year 15 production. A flat guarantee number for all 25 years either overpromises early or underpromises later.
A production guarantee without monitoring is an empty promise. If nobody is watching your system, underperformance can go undetected for months or years -- by which time the lost production (and lost ADI income) is unrecoverable.
Effective monitoring for a NJ solar system includes:
In NJ, where ADI income depends on metered production data submitted to the SuSI platform, monitoring is not optional. It is the foundation of both your guarantee claim and your ADI revenue verification.
What is the guaranteed minimum annual production in kWh for my specific system?
How is the guarantee adjusted for panel degradation over time?
What is the reimbursement rate per kWh -- retail or wholesale?
Does the guarantee compensate for lost ADI/SREC-II income from underproduction?
What are the exclusion clauses? Which scenarios are not covered?
How is production measured and verified -- what monitoring system is used?
What is the claim process? Do I need to pay for a third-party audit?
How long is the guarantee term? Does it match the ADI 15-year period?
What happens to the guarantee if the company is sold or goes out of business?
Can I see a sample guarantee document before signing the contract?
NJ's ADI/SREC-II program pays $85.00 per MWh (megawatt-hour) for 15 years. This income is based on actual metered production, not estimated production. Every kilowatt-hour matters.
Here is the financial impact of underperformance on a 10 kW system in NJ:
| Scenario | Annual kWh | ADI/Year | 15-Year ADI | Lost Income |
|---|---|---|---|---|
| Expected (100%) | 12,500 | $1,074 | $16,110 | -- |
| 5% Under | 11,875 | $1,020 | $15,300 | -$810 |
| 10% Under | 11,250 | $967 | $14,505 | -$1,605 |
| 20% Under | 10,000 | $859 | $12,885 | -$3,225 |
This table shows ADI income only. Add lost electricity savings ($0.18/kWh x lost kWh) for the full financial impact of underproduction.
NuWatt backs every NJ installation with a written production guarantee that covers both electricity savings and ADI income. See your guaranteed production numbers before you sign.