Common Solar System Problems

What You're Seeing

• Monitoring app shows zero or near-zero production
• Your inverter display is blank or dark
• No energy flowing to your home or the grid
• System has been down for days or weeks without you noticing

What's Actually Happening

This is the #1 panic moment for solar homeowners. The most common causes are a tripped breaker, a failed inverter, or a grid outage that your system didn't recover from. In some cases, a firmware update or communication fault between the inverter and monitoring system can also cause a complete production stop.

What You're Seeing

• Solid red or flashing red light on inverter
• Error code displayed on inverter screen
• System producing zero power
• Inverter making unusual buzzing or clicking sounds

What's Actually Happening

A red light on your inverter always means a fault condition. On SolarEdge inverters, common codes include 18xB7 (ground fault), 2x19 (arc fault), and 3x4A (isolation fault). Enphase Envoy gateways show red when communication with microinverters is lost. String inverters like SMA or Fronius show red for grid faults, ground faults, or internal component failure.

What You're Seeing

• Enlighten app shows 'system offline' or 'no data'
• Envoy gateway LEDs show red or no activity
• Production data is missing for days or weeks
• Can't connect to Envoy locally via IP address

What's Actually Happening

The Enphase Envoy gateway is the bridge between your microinverters and the internet. When it fails, you lose all visibility into your system. Common causes: the Envoy lost its Wi-Fi connection, a power surge damaged the unit, the Envoy's internal cellular modem (if equipped) lost signal, or a firmware update failed and bricked the device.

What You're Seeing

• Powerwall shows 0% or very low charge and won't increase
• Tesla app shows 'not charging' or 'standby' forever
• Powerwall only charges from grid, not solar
• Battery drains within minutes of an outage

What's Actually Happening

Powerwall charging failures fall into a few categories: the Backup Gateway has lost communication with the Powerwall, the battery's internal BMS (Battery Management System) has tripped a protection fault, a firmware update failed mid-install, or the battery cells have degraded below operational thresholds. In some cases, the Powerwall is fine but the Gateway — which controls when and how it charges — is the actual problem.

What You're Seeing

• Monthly bills are $50-$200+ higher than same month last year
• Net metering credits dropped significantly
• You're importing more grid power despite similar usage
• Bill shows higher kWh usage but you haven't changed habits

What's Actually Happening

A spiking PG&E bill is often the first sign of a failing solar system — and many homeowners don't connect the dots for months. Your system may be underproducing due to panel degradation, inverter failure, monitoring issues, or physical damage. PG&E rate changes and time-of-use plan shifts can also increase bills, but a sudden spike usually means your solar isn't carrying its weight.

What You're Seeing

• System was fine before the outage, dead after
• Inverter won't restart or shows error after grid returns
• Breaker in main panel is tripped
• Some but not all components came back online

What's Actually Happening

Power outages and the surges that accompany them are hard on solar equipment. When grid power returns, the voltage spike can damage inverter components, trip breakers, or corrupt firmware. Systems with battery backup may get stuck in 'island mode' and fail to reconnect to the grid. Surge protectors on the AC and DC sides can also be sacrificed during an outage.

What You're Seeing

• App shows 'offline', 'no data', or last update was days ago
• Can't view real-time or historical production
• Inverter itself appears to be working normally
• Wi-Fi network changed recently

What's Actually Happening

Offline monitoring doesn't necessarily mean your system isn't producing — it means the communication link between your system and the internet is broken. Common causes: Wi-Fi password changed, router replaced, signal too weak (especially for inverters in garages or on exterior walls), cellular modem (3G/4G) was sunset or lost signal, or the communication module hardware failed.

What You're Seeing

• Solar breaker in main panel trips repeatedly
• Breaker trips immediately after reset
• Burning smell near electrical panel
• Arc fault or ground fault error on inverter

What's Actually Happening

A repeatedly tripping solar breaker is a serious issue — it means your system is drawing too much current or there's a fault condition. Common causes: damaged wiring (from critters, weather, or age), a failed component creating a short circuit, water intrusion into a junction box or inverter, or an undersized breaker that was incorrectly installed during the original installation.

What You're Seeing

• One or two panels showing zero or very low production
• Other panels producing normally
• SolarEdge monitoring shows 'optimizer not communicating'
• System still produces but at reduced output

What's Actually Happening

SolarEdge power optimizers are mounted one per panel (or per two panels on older systems). Each optimizer is exposed to roof-level heat, moisture, and temperature swings — they fail at a higher rate than most homeowners expect. A single failed optimizer typically only affects the panel(s) it's connected to, not the entire system. However, multiple optimizer failures can add up to significant production loss.

What You're Seeing

• Individual panel shows zero output in Enlighten
• Other panels on the same branch are working fine
• Envoy sees the microinverter but it reports 0W
• No error — the panel just stopped reporting or producing

What's Actually Happening

Enphase microinverters (IQ7, IQ7+, IQ8, IQ8+) are generally reliable but do fail. Heat is the #1 killer — microinverters mounted under panels in hot attics or on south-facing roofs in Northern California summers can cook. Manufacturing defects, water intrusion at the connector, or a failed internal capacitor are also common. The good news: microinverters are modular, so one failure doesn't affect the rest of your array.

What You're Seeing

• Gradual decline in monthly kWh production
• System is 5+ years old and output is noticeably lower
• Same-season comparison shows year-over-year decline
• No error codes — just less power than before

What's Actually Happening

All solar panels degrade over time — typically 0.5-1% per year. But faster decline suggests a problem: PID (Potential Induced Degradation) is common in older systems and can sap 10-30% of production. Dirt and debris buildup reduces output. Shading from trees that have grown since installation. Or you may have individual panels or optimizers failing that aren't obvious in aggregate monitoring.

What You're Seeing

• Monitoring shows production, but utility meter still shows import
• You're paying PG&E despite solar system appearing to work
• Net metering credits are nearly zero
• Bills don't reflect solar production you can see in your app

What's Actually Happening

This is a frustrating but common issue. The most likely cause: your system is producing energy but your home is consuming it all in real-time (or your battery is soaking it up), so nothing is being exported to the grid. Other possibilities: your CT (current transformer) meters are installed backwards or have failed, giving you false production readings, or your utility meter is configured incorrectly for net metering.

What You're Seeing

• System is 10-20+ years old
• Panels show visible degradation (discoloration, delamination)
• Production has declined 20% or more from original
• Repair costs are adding up year after year

What's Actually Happening

Quality solar panels last 25-30+ years, but inverters last 10-15, optimizers 8-12, and batteries 10-15. Most 'system failures' on older installations are actually inverter or wiring failures — the panels themselves are often fine. True panel failure is usually visible: delamination (layers separating), snail trails (dark discoloration lines), or burned cells.

What You're Seeing

• No documentation from previous owner
• Don't have access to monitoring app or login
• No idea what brand panels or inverter you have
• Unsure if system is owned, leased, or financed

What's Actually Happening

New homeowners often inherit solar systems with zero information. The previous owner may not have transferred monitoring access, the installer may be out of business, or the system may have been installed years ago and never checked. You might be paying for a system that's producing nothing — and you wouldn't know.

What You're Seeing

• Buzzing, humming, or clicking sounds from inverter
• Noise is louder than normal operating sound
• Sound changes with production level or time of day
• Neighbors' inverters don't make this noise

What's Actually Happening

All inverters make some noise — cooling fans, internal relays clicking during grid sync, and transformer hum are normal. But loud buzzing or rapid clicking usually means: a failing cooling fan (most common), loose internal components vibrating, an electrical arc starting to form (serious — fire risk), or a relay that's cycling on and off rapidly due to a grid voltage issue.

What You're Seeing

• Visible layer of dust, pollen, or bird droppings on panels
• Production seems lower after fire season or pollen season
• Your panels haven't been cleaned in 2+ years
• Neighbors with clean panels seem to produce more

What's Actually Happening

Yes, dirty panels produce less — typically 5-15% less, but in extreme cases (heavy soot from wildfire season, accumulated bird droppings, or pollen caked on by morning dew) losses can hit 25%. Northern California's wildfire smoke and agricultural dust make panel soiling a real issue here. The good news: rain helps, but it doesn't clean the corners and edges where dirt accumulates worst.

What You're Seeing

• System is 8 years old and something failed
• Not sure if you have a product warranty or just a performance warranty
• Installer is out of business and you don't know who to contact
• You filed a claim and it was denied — was that fair?

What's Actually Happening

Solar warranties come in layers. Panels typically have a 25-30 year performance warranty (guarantees ~80-87% output at year 25) and a separate 10-12 year product warranty (covers defects and physical failure). Inverters usually carry 10-12 years (extendable to 20-25 on some brands). Optimizers are 25 years on paper but often prorated. Workmanship warranties from installers are typically 5-10 years — but only good if the installer still exists. Critical: the product warranty is through the manufacturer, not your installer — so even if your installer is gone, the panel and inverter warranties may still be valid.

What You're Seeing

• Power goes out and your solar system shuts off too
• Even on a sunny day, no solar power during an outage
• You expected solar to work during blackouts
• Frustrated that you still lose power despite having solar

What's Actually Happening

This is the most misunderstood thing about solar. Grid-tied solar systems (which is what 95%+ of homes have) are REQUIRED by code to shut down during a blackout. This is called anti-islanding — it protects utility workers from being electrocuted by your solar system feeding power back into lines they think are dead. Without a battery (Tesla Powerwall, Enphase IQ Battery, etc.), your solar CANNOT power your home during an outage — period. Solar + battery systems set up for backup power CAN run during outages, because they disconnect from the grid and form their own mini-grid.

What You're Seeing

• Production is lower in July/August than in May/June
• System seems worse on the hottest, sunniest days
• Other people say summer is their best production month
• Monitoring shows lower peak output at midday

What's Actually Happening

Counterintuitive but true: solar panels lose efficiency as they get hotter. The temperature coefficient means your panels lose about 0.3-0.5% output for every 1°C above 25°C (77°F). On a 100°F NorCal summer day, your roof can hit 140°F+ and your panels lose 10-15% efficiency compared to a cool spring day. Also, summer haze, wildfire smoke, and higher sun angles can reduce effective irradiance. Spring and fall are often the highest-production seasons in California.

What You're Seeing

• Your energy needs have grown since installation
• You added an EV or heat pump and need more power
• Your current system was undersized from the start
• You want to reach 100% offset but currently fall short

What's Actually Happening

Yes, you can expand most solar systems — but it's not as simple as bolting on more panels. Your existing inverter has a maximum capacity. If you have a SolarEdge string inverter rated for 7.6kW and already have 8kW of panels on it, you're at the limit. Microinverter systems (Enphase) are easier to expand because each panel is independent. You may also need to upgrade your electrical panel if it's near capacity. PG&E interconnection agreements may need to be updated for the new system size.

What You're Seeing

• You heard NEM 3.0 made solar less valuable
• Considering solar but worried about payback period
• Existing solar owner wondering if your rates changed
• Confused about what NEM 3.0 actually means

What's Actually Happening

NEM 3.0 (Net Billing) took effect April 2023 and significantly reduced the value of solar energy exported to the grid — from retail rates (~$0.25-0.45/kWh) to wholesale/avoided cost rates (~$0.02-0.08/kWh). This means exporting power during the day earns you very little. The new math: self-consuming your solar power is now worth 5-10x more than exporting it. This makes batteries extremely valuable under NEM 3.0 — store your daytime excess and use it during expensive evening hours instead of selling it cheap.

What You're Seeing

• Monitoring app shows more production than your bill credits
• PG&E says you imported more than your app says you did
• Numbers don't reconcile — and you don't know which to trust
• You suspect you're being underpaid for your solar exports

What's Actually Happening

Your monitoring system measures production at the inverter (DC side) or at the production meter (AC side). PG&E measures at your utility meter, which sees net flow to/from the grid. Several things cause discrepancies: your home consumes some solar directly before it reaches the meter (good — that's self-consumption), your CT meters may be installed backwards or have failed, or your inverter's production readings include energy that was lost as heat before reaching the meter. A 5-10% discrepancy is normal. Larger gaps suggest a metering or monitoring problem.