A solar system for your home or business is a long-term investment, and getting the most from it means keeping the panels producing at full strength. When output dips, the encouraging news is that the cause is usually easy to identify and, in many cases, something a homeowner can check and resolve in a few minutes. We will explain how to tell whether production has genuinely dropped, the common reasons it happens, the simple checks worth doing first, and when it makes sense to bring in a professional.
SolarCraft has designed, installed, and serviced solar and battery systems across Marin, Sonoma, and Napa since 1984, completing more than 9,000 installations. Our in-house service team helps North Bay homeowners keep their solar systems performing at their best, including systems originally installed by other companies.
First, confirm production has actually dipped
Before assuming anything is wrong, it is worth confirming that production has genuinely fallen, because the most common explanation for a system that looks idle is a simple reporting hiccup rather than a fault. Three indicators tell the real story.
The first is the monitoring platform. Enphase, SolarEdge, Tesla, and similar systems report output directly to an app or web portal. A single panel or string reading zero while the rest produce normally points to an isolated issue, while a whole system reading zero points to something affecting the entire array. A figure that is simply lower than usual is a different signal, often related to weather, season, or gradual soiling rather than a fault.
The second is the inverter itself. A steady green light almost always indicates normal operation. A red or amber light, a blank screen, or an error code displayed is the system telling you it has found something worth a closer look. Noting the exact code or light pattern makes any later conversation faster.
The third is the utility bill. A true-up balance, or a monthly amount that climbs without a change in household habits, is frequently the first thing a homeowner notices. Read together, these three indicators usually reveal whether there is anything to address and roughly where it sits.
It also helps to know what normal looks like. Output naturally falls on short winter days, under heavy cloud cover, and during the coastal fog common across the North Bay, and it recovers on its own. What is worth a second look is a clear, sustained drop, a single component reading zero, or a complete stop that does not track the weather.
Common reasons for output dips, from the simple to the technical
Most dips trace to a short list of causes, and the most common ones are also the easiest to resolve. They are listed here roughly in that order, from the simple and routine to the less common and more technical.
- A tripped breaker or disconnect after an outage. This is among the most frequent and simplest explanations. Following a PG&E outage or grid disturbance, many systems pause for safety and do not always restart automatically. Confirming that the solar breaker and the AC and DC disconnects are in the on position often restores production with nothing further required.
- An inverter that needs a restart. The inverter converts the DC power generated by the panels into the AC power the home uses. A fault light or error code can pause output, and a single controlled restart, following the manufacturer's instructions, clears many of these on its own. A message that returns after a restart simply means it is worth having a professional take a look.
- A monitoring or connectivity dropout. In a good share of cases, the panels are producing normally, and only the reporting has dropped offline. A changed home Wi-Fi password, a new router, or a brief internet outage can show zero on a perfectly healthy system, which is why this is worth ruling out early.
- Shading or soiling. Output eases when something shades the panels. New tree growth, accumulated pollen, dust, leaves, or droppings reduce production, most noticeably along the lower edge of the array, and this kind of change tends to appear gradually. SolarCraft's overview of cleaning solar panels explains what can be handled safely and what is best left to a technician.
- Wear on a component. Solar equipment is built to last, so this is less common, but it does happen with age. Quality panels are designed to keep producing for 25 years or more and rarely fail first. Inverters have a shorter service life, frequently ten to fifteen years, so an older system that gradually slips may simply have an inverter nearing the end of its useful life and ready for replacement.
- Support after the original installer has closed. The North Bay solar market has seen many companies open and then close, leaving homeowners unsure who to call. If that has happened, you are not stranded. SolarCraft has remained a stable, locally owned presence for four decades and regularly services and supports systems installed by companies that are no longer in business.
A quick way to narrow it down
The way a change appears tells you a lot. A sudden drop, where production goes from normal to zero, usually traces to a tripped breaker, an inverter that needs a restart, or a disconnect after an outage, which are the categories most often resolved quickly. A gradual decline, where output slips lower over weeks or months, usually points to soiling, advancing shade from tree growth, or a component reaching the end of its life. Knowing which pattern matches your situation makes the cause easier to pin down.
What you can check yourself
Several checks are simple and safe, and they resolve a fair number of cases on their own. Confirm in the monitoring app whether the output has actually dropped and whether it affects a single panel or the entire system. Note any inverter light or error code, along with its exact wording. Check that the solar breaker and the AC and DC disconnects are switched on, since a disconnect tripped by an outage is both common and easily corrected. Look over the array from the ground for visible shading or soiling. And if the manufacturer's manual describes a restart, a single ground-level inverter restart is reasonable. When these steps do not resolve it, they give a technician a clear head start.
When it is worth calling a professional
A few things are best left to a professional, both for safety and to protect your warranties. Anything that involves getting on the roof, opening the inverter, or handling DC wiring should be left to a technician, since solar DC wiring carries voltage even when household power is off. The same is true for a recurring fault, any electrical work, or inspecting and replacing panels, connectors, or racking.
It is worth making the call when the system has produced little or nothing for more than a day or two in good sun, when an inverter message returns after a restart, when there is visible damage or corrosion, when a breaker trips repeatedly, or when production has not recovered after a storm or major outage. Because every day a system sits idle is solar you have paid for and are not using, addressing it promptly is simply the best way to protect the return on the investment. Prompt professional service and maintenance get the system back to full output sooner.
What to expect from SolarCraft
When you call SolarCraft, your system is handled by the company's own people. SolarCraft is 100% employee-owned, and its installers and service technicians are licensed, certified employees rather than subcontractors. The company holds General Contractor (B) and Electrical Contractor (C-10) licenses and was the first in California to earn the state's Solar Energy license (C-46), a credential that covers every part of a residential system.
A service visit begins with a full diagnostic of the panels, inverter, wiring, and monitoring, followed by a clear explanation of what the technician finds and a recommended path forward. SolarCraft services solar electric and battery systems across Marin, Sonoma, and Napa, including maintenance, repair, and component replacement, and backs its work with some of the strongest warranties in the industry. When you are ready, you can request a service visit or call.
Getting the most from your system
The best way to keep a system producing is a little routine attention, which makes the occasional dip easy to catch early. Glancing at the monitoring app from time to time surfaces a change before it shows up as a surprise on a bill, and periodic professional maintenance keeps panels, connections, and inverters performing as they should. For homeowners who also want resilience during outages, pairing the system with battery storage keeps essential circuits running when the grid goes down. A modest amount of care is what turns a solar investment into decades of dependable output.
