Solar Monitoring and Troubleshooting Reference

Why this reference exists

Installed solar systems need ongoing monitoring + occasional service. Service revenue is a modest per-visit fee, often recurring. Customer's call: "my system stopped producing" - could be panel failure, inverter issue, monitoring fault, utility outage, or routine maintenance need. This reference is the working diagnostic workflow.

Monitoring platforms

Enphase Enlighten (microinverter):

• Panel-level monitoring (each inverter reports)
• Mobile app + web portal
• Customer + installer separate views
• Shows historical production, current status, alerts
• Free for customer; installers have access to fleet view

SolarEdge mySolarEdge (string inverter + optimizers):

• Panel-level monitoring (DC optimizers report)
• Similar interface to Enphase
• Customer + installer views

SMA Sunny Portal (string inverter):

• Portal-based
• System-level monitoring (less granular than per-panel)

Tesla App (solar + Powerwall):

• Combined solar + battery monitoring
• Tesla integration

Generic monitoring (Solar Edge Insight, etc.):

• Third-party services
• Add-on to existing systems

For service tech: access to customer's monitoring is the FIRST step in diagnosis.

Common service calls

"System stopped producing"

Most common call. Steps:

Step 1: Check monitoring

• Customer authorizes access OR shows screen
• Last successful production date
• Specific panels failing vs whole system

Step 2: Verify utility

• Was there a grid outage? (Solar with anti-islanding shuts off when grid down)
• After grid returns, system should auto-restart

Step 3: Visual inspection

• Inverter LED status (green = OK; red/blinking = fault)
• AC disconnect switch (could be tripped)
• DC disconnect (if applicable)
• Conduit + wiring damaged

Step 4: Check error codes

• Inverter display OR app
• Common codes: arc fault, ground fault, voltage out of range, isolation resistance

Step 5: Check string voltage

For string inverter:

• Measure DC voltage at inverter input
• Expected: panel voltage × number of panels in string
• Low or zero: panel issue, optimizer issue, or wiring fault

For microinverter:

• Each microinverter has individual reporting
• Failed microinverter = single panel offline
• Easy diagnostic

"Reduced production"

System produces less than expected:

Likely causes:

• Shading (tree growth, new structure, seasonal sun angle)
• Soiled panels (dust, leaves, snow, pollen)
• Failing optimizer / microinverter (single panel)
• Inverter throttling (utility grid issue)
• Module degradation (normal 0.5-1%/year)

Step 1: Compare actual vs expected production

• Customer reports decline
• Compare to PVWatts (NREL free calculator) for expected production at their location
• 20%+ below expected = real issue

Step 2: Visual on roof

• Shading from new growth?
• Panels soiled?
• Visible damage (cracks, hot spots)?

Step 3: Per-panel monitoring

• If platform supports: per-panel data
• Identify underperforming panels
• One or two off = panel or optimizer issue
• All low = upstream issue

"Inverter beeping / red light"

Inverter fault. Read code per manufacturer.

Common faults:

• Arc fault: NEC 690.11 requirement; ground or arc detected. Reset; if recurs, find arc location
• Ground fault: insulation breakdown somewhere; locate + repair
• Isolation resistance: similar; measure with insulation tester
• Voltage out of range: utility grid voltage outside spec; usually self-resolves
• Communication loss: monitoring offline; check Wi-Fi + cellular

Battery system issues

For solar + battery customers:

Battery not charging / discharging:

• Check battery monitoring app
• Mode setting (some customer-configured)
• Charging limit reached
• Communication with solar inverter

Battery + solar mismatch:

• Inverter incompatibility
• Recommissioning needed
• Sometimes firmware update fixes

Customer monitoring access

Sometimes customer locked out of app:

• Email + password reset
• Account transfer (e.g., customer bought house with solar)
• Installer credentials override

Service call may be 30-60 minutes of monitoring account help. Charge for time.

Diagnostic tools

For solar service:

• Multimeter (DC + AC voltage)
• Clamp meter (DC + AC current)
• Insulation tester / megger (for ground fault diagnosis)
• IR camera (find hot spots in panels)
• Roof safety equipment
• Manufacturer apps + scan tools
• Wi-Fi + cellular tester

Investment: a moderate one-time cost for a basic service kit.

On-site procedure

Step 1: Customer + monitoring

1. Confirm customer auth
2. Access monitoring app
3. Review past 30 days production
4. Identify failure point in time

Step 2: Equipment inspection

1. Inverter status + error codes
2. AC + DC disconnect
3. Conduit + wiring (visual)
4. Roof safety setup before climbing

Step 3: Roof inspection

1. Panels visual (cracks, hot spots, vegetation)
2. Wiring + connectors visible
3. Photo documentation

Step 4: Electrical test

1. DC voltage at inverter
2. AC voltage at output
3. Per-panel voltage if accessible (microinverter)

Step 5: Repair or diagnostic

1. Identify root cause
2. Quote repair
3. Customer approves
4. Repair + retest

Warranty considerations

Most residential solar:

• Panels: 25-year linear performance warranty
• Microinverters: 25-year warranty (Enphase)
• String inverters: 10-12 year warranty (extendable)
• Optimizers: 25-year (SolarEdge)

Service tech filing warranty claim:

• Document failure (photo, error code, monitoring data)
• File with manufacturer
• 7-30 day approval typical
• Replacement parts arrive
• Install + commission

Warranty work: usually customer doesn't pay (manufacturer pays or covers part; tech labor often included).

Customer talking points

For diagnostic call:

1. "Monitoring shows production dropped on [date]"
2. "Likely cause: [diagnosis]"
3. "Repair: $X. Warranty may cover."
4. "After fix: monitoring should restore + I'll watch for 30 days"

For preventive:

1. "Annual maintenance: $Y. Cleans panels + checks all connections + reviews monitoring"
2. "Catches issues early; prevents downtime"

For aged system (10+ years):

1. "Inverter typically lasts 10-15 years; replacement option"
2. "Panel degradation 0.5%/year typical; still producing well"
3. "Battery storage retrofit available for $Z"

Service contract revenue

Solar maintenance is recurring:

• A modest annual fee per system, scaling into a solid revenue line across a fleet of installs

Build customer relationship at install; maintenance contracts follow.

Common pitfalls

• Customer can't access monitoring: diagnostic delayed
• Skipping monitoring data: guessing at issue
• Wrong manufacturer parts: warranty void
• Roof safety shortcut: fall risk
• No documentation: customer dispute or warranty issue
• Customer expects free service: pre-pay or contract framework needed
• Old inverter EOL: customer expects same lifespan as panels (not true)

References

• NEC Article 690 (PV Systems) + 706 (Energy Storage)
• IEEE 1547 Utility Interconnection
• PV Industry Best Practices (SEIA)
• Manufacturer documentation (Enphase, SolarEdge, SMA, Tesla)
• PVWatts (NREL free production calculator)
• Manuall internal: Solar PV Residential Electrical Interface Reference