Sunprint
The short answer
A properly sized, fully working solar system at a utility that credits exports well should make a visible dent in your bill. When it doesn't, or it did and then stopped, the cause is almost always one of five things: the system was undersized for your actual usage, part of it is shaded, it has quietly stopped producing, your utility pays little for the power you send back, or your usage has grown since the system was sized. None of these are rare, and all of them are checkable.
The system may be undersized for your usage
Solar quotes are sized to a percentage of your past usage, often 75 to 95 percent, not 100 percent, and the estimate is only as good as the utility bills it was based on. If those bills were old, from a smaller household, or from before you were home more often, the system can simply be undersized from day one. This is not a malfunction, it's a sizing gap.
Our bill-size guide shows what a $300 to $700 bill needs at Florida's average rate, and how that changes utility by utility. If your system was sized years ago, it's worth rerunning that math against your current usage.
Shading cuts more than most owners expect
A little shade doesn't cost a little output. On systems wired with a traditional string inverter rather than microinverters or power optimizers, panels are connected in a series string, and the weakest panel in that string can drag down the output of every panel behind it, not just its own. A tree that was small enough to ignore at installation can be casting real shade on part of the array a few years later.
If your production has dropped gradually over a year or two rather than all at once, growing shade is one of the more likely explanations, and it's worth a look at the roof at different times of day, not just a glance at noon. Bird droppings and leaves left on the glass act like shade too; our guide to cleaning solar panels in Florida covers when that's worth fixing.
A system can fail silently, for months
This is the cause owners are least likely to catch on their own, because a solar system that stops producing doesn't announce itself. It just quietly stops helping, while the bill slowly climbs back toward what it was before solar.
A documented Treasure Coast case makes the point concretely: a homeowner's leased system silently failed in February 2026. Nobody noticed until July, five months later, when FPL told her the system had been down the whole time. By then her monthly cost had climbed to roughly $300, about $150 to FPL plus $150 for the lease, nearly triple what she paid before going solar. The system had a 10-year warranty, but the installer had gone out of business by the time she tried to use it.
Solar wasn't the problem. Nobody was watching the monitoring app during those five months. See our guide on what to do if a solar company disappears if you're in a similar spot.
Your utility's credit rate changes the math entirely
Two identical systems can produce identical savings math on paper and completely different real bills, because Florida utilities do not pay the same for exported solar. FPL, Duke, TECO and FPU credit exports at the full retail rate, so a well-sized system offsets most of a bill regardless of when the power is used. At utilities like JEA, GRU, Peace River Electric and West Florida Electric, exported power is worth a fraction of the retail rate, sometimes under 6 cents per kWh, so a system that exports a lot during the day but doesn't get used at home saves far less than the same system would at a retail-rate utility.
If your bill is higher than a neighbor's identical system in a different utility's territory, this is usually why. Our net metering guide has the exact credit rate for every utility we cover.
New usage since the system was sized
A pool pump, an EV charger, a second central AC unit, or simply more people working from home all add real load that the original system was never sized to cover. This shows up as a bill that used to look great and gradually stopped, without anything about the solar system itself changing. It's a sizing mismatch, not a failure, and the fix is usually adding panels rather than troubleshooting the existing ones, if your roof and inverter capacity allow it.
What to check, in order
- Open the monitoring app. Compare this month's production to the same month last year. A large unexplained drop points to a fault or new shading, not usage.
- Look at the array at different times of day. Shade at 8am or 4pm that wasn't there before is easy to miss if you only check at noon.
- Check your utility's export credit rate. If it's well below retail, a lower-than-expected bill reduction can be normal, not a fault.
- Think about what's changed at home. A pool, an EV, a new AC unit, or simply more people home during the day all raise the bar the system needs to clear.
- If production looks broken, call for service now. The Perez case above cost five extra months of full bills because nobody looked sooner.
Your estimate in three steps
- Enter your billYour ZIP code, your utility and last month's bill.
- See your estimateA yearly savings range based on your utility's rates and Florida sun.
- Choose what's nextAsk for a quote call if you want real pricing, or just keep the number.
See what solar could save you
It takes about a minute. You don't need a site visit, a commitment or a sales call to see your number.
Common questions
Why is my electric bill still high after going solar?
Usually one of five things: the system is undersized for how much you use, part of the array is shaded, the system has silently stopped producing and nobody noticed, your utility credits exported power at well below the retail rate, or your usage went up after you added a pool pump, EV charger or new AC unit.
How would I know if my solar system stopped working?
Check your installer's monitoring app, not just your electric bill. A bill takes a full cycle, sometimes longer, to reflect a production drop. One Treasure Coast homeowner's system went down in February 2026 and wasn't caught until July, by which point her bill had nearly tripled. Checking the app monthly catches this in weeks, not months.
Can shading really make that much difference to solar output?
Yes, more than most owners expect. On systems without microinverters or power optimizers, panels are wired in a series string, so shading on even one panel can drag down the output of the entire string it's part of, not just that one panel. A tree that was small at installation can be casting real shade a few years later.
Does my utility affect how much solar saves me?
Significantly. FPL, Duke, TECO and FPU credit exported solar at the full retail rate, so a well-sized system can offset most of a bill. Utilities like JEA, GRU, Peace River and West Florida Electric pay a fraction of that for exported power, so savings depend much more on how much you use during the day rather than how much the system exports. See our net metering guide for the exact rate at your utility.
Can adding a pool pump or EV charger make my bill go up after solar?
Yes. A system sized for your usage before a pool, EV or new central AC unit will cover less of your new, higher usage. This isn't a system failure, it's a sizing mismatch. Ask your installer about adding panels, or check whether your roof and panel capacity allow for an expansion.
What should I check first if my solar bill seems too high?
Start with the monitoring app or portal from your installer or inverter manufacturer, and compare this month's production to the same month last year. A large, unexplained drop points to shading, a fault or a failed component. If production looks normal, the explanation is more likely usage growth or your utility's credit rate.
Does a higher bill mean my solar company scammed me?
Not necessarily, though it can be a sign worth investigating. Real Florida cases have involved systems that failed and went unrepaired for months while the installer had gone out of business. If your production has dropped and nobody will service it, see our guide on how to check a solar company for what to do next.
How often should I check my solar system's performance?
At least monthly. Most monitoring apps show daily and monthly production, and comparing to the same month a year earlier accounts for seasonal changes in Florida sun. Catching a drop within a billing cycle or two is far cheaper than discovering it after months of lost production.
Related guides
- Florida net metering explained
- How much solar do I need for a $300 to $700 electric bill?
- How to check a solar company, and door-to-door red flags
- How much electricity does a 10, 15 or 20 kW system produce?
- Is solar worth it in Florida in 2026?
For a hands-on check, a licensed installer can test the system on site. Sources: installer and industry guidance on system monitoring and shading, utility net metering data cited throughout this site, and Florida case reporting cited on our solar company red flags guide.
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