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How to Read Your Solar Monitoring App — Key Metrics Explained
Every grid-tied inverter comes with a monitoring app — Solarman, SolarGo, mySolarEdge, Goodwe SEMS, AlphaCloud. They all show the same core metrics, but most homeowners only watch one number: today's kWh. Here are the 7 metrics that give you a complete picture of system health and performance.
The 7 Metrics That Matter
Metric | What It Means | What to Watch For |
|---|---|---|
Today's Generation (kWh) | Total solar energy produced today | Compare to same day last week — drops of 20%+ need investigation |
Current Power (W or kW) | Real-time solar output right now | At solar noon should be 75-90% of system peak Wp |
PR (Performance Ratio %) | Actual output ÷ theoretical maximum | Philippine standard: 75-82% is healthy; below 70% investigate |
Grid Import (kWh) | How much you drew from Meralco today | High grid import on sunny days = panels or inverter issue |
Self-Consumption (%) | How much solar you used directly | Higher = better; aim for 70%+ without battery |
Inverter Temperature (°C) | Internal inverter temperature | Above 65°C regularly = ventilation problem |
String Voltage (V) | DC voltage from each panel string | Significant difference between strings = shading or panel fault |
Monthly Health Check
Every month, check your app's historical view and ask:
Is monthly generation within 10% of the previous same month last year?
Did generation drop on clear-weather days? (Use PAGASA weather data to correlate)
Are any error codes appearing? (Even intermittent ones)
Red Flags That Need Immediate Action
Zero generation on a sunny day — inverter fault, DC disconnect tripped, or panel issue
Grid-only mode — inverter may have lost solar input; check string fuses
Performance drop of 15%+ sustained over 1 week — likely soiling, shading, or panel degradation
Inverter temperature alerts — check ventilation clearance (minimum 200mm on all sides)
Get your system checked by a verified installer at solarenergyph.shop if you spot any of these issues.
Engr. Jason Morales — Founder, SolarEnergyPH