How to Read Your Solar Monitoring App Data
Every solar system comes with a monitoring app. Here is what the generation, consumption, and export figures actually mean, and how to tell a bad day from a real problem.
Quick answer
A solar monitoring app shows real-time generation in kW, cumulative generation in kWh, and typically a breakdown of self-consumption versus export. A single low-generation day is usually weather, not a fault. A sustained decline over multiple weeks, compared against your expected generation figure, is the signal actually worth investigating.
Every solar system in Singapore comes with a monitoring app, and the figures it shows, generation, consumption, export, are more useful once you know what each one actually measures. Reading this data correctly also helps you tell a normal weather-driven low day apart from a genuine developing problem worth raising with your installer.
What do kW and kWh actually mean on the dashboard?
kW (kilowatts) is an instantaneous rate, how fast your system is generating power at this exact moment, which rises and falls through the day as sunlight intensity changes. kWh (kilowatt-hours) is a cumulative total, the actual energy generated over a period of time, shown as daily, monthly, and lifetime totals. Think of kW as speed and kWh as distance travelled; your app tracks both.
What does the self-consumption versus export split actually tell you?
Self-consumption is the share of your generation used directly by your home as it is produced, which offsets electricity you would otherwise buy at the full retail tariff rate. Export is the surplus beyond what your home is using at that moment, sent to the grid and credited at the lower ECIS rate. This split shifts throughout the day, typically highest self-consumption in the morning and evening when household usage overlaps with generation, and more export around midday when generation peaks but usage may be lower.
| Metric | What it measures | How to use it |
|---|---|---|
| Real-time kW | Current generation rate | Sanity-check against expected output for the time of day and weather |
| Daily/monthly kWh | Cumulative energy generated | Track against your expected annual yield figure |
| Self-consumption % | Generation used directly by your home | Higher generally means more savings per kWh generated |
| Export kWh | Surplus sent to the grid | Credited at the ECIS rate, lower than the retail tariff |
How do I tell a normal low day from an actual problem?
A single low-generation day, particularly on a visibly overcast or rainy day, is entirely normal and expected. Singapore's 4.33 peak sun hours a day figure is already an annual average that accounts for cloudy days, so daily variation around that average is built into how solar generation naturally works.
A genuine concern looks different: a sustained decline over several weeks that does not track with weather, or a sudden drop toward zero output. Either of those is worth comparing against your system's expected generation and raising with your installer if it persists.
Is comparing this month against last month actually the right way to spot a problem?
Not entirely, and this is a subtle but genuinely useful distinction. Singapore's Northeast Monsoon means November through January naturally generates less than the drier months, so a month-over-month drop during that stretch can look alarming while actually being normal seasonal variation, not a developing fault. Comparing the same month against the same month a year earlier, once you have at least a full year of your own data, strips out that seasonal effect and gives a genuinely more reliable read on whether your system's underlying performance is actually changing.
Do monitoring apps actually alert you automatically, or does a homeowner have to check manually?
Most modern monitoring platforms do include some form of automated alert, commonly triggered by a sudden generation drop or a fault code from the inverter itself, but the specific sensitivity and reliability of these alerts vary meaningfully between brands and platforms. Treat an automated alert as a useful early signal worth investigating, not as a guarantee that silence means everything is genuinely fine; periodically glancing at your own trend data remains a reasonable habit even with alerts enabled, since no automated system catches every possible developing issue with equal reliability.
What should you actually check periodically in the app?
Compare your monthly or year-to-date generation against your original P50 estimate to see if your system is tracking close to expectation, allowing for normal seasonal and weather variation. This kind of periodic self-check is a useful supplement to, not a replacement for, a professional system health check, since the app cannot see connection integrity or physical mounting condition.
Further reading: see the P50/P90 estimates guide for what a realistic generation baseline looks like, and production reality vs simulation for why actual output varies from projections. Run the Sunnify solar estimate to see your own expected generation figure, the real baseline your monitoring app's numbers should be measured against.
Does the self-consumption figure actually matter for anything beyond curiosity?
Yes, directly, since it is the piece of your monitoring data most closely tied to your actual savings. A higher self-consumption share means more of your generation is offsetting electricity at the full retail tariff rather than earning the lower SCT or ECIS export rate, so a homeowner genuinely interested in maximising savings, not just tracking generation, has real reason to watch this figure and consider shifting flexible household usage, like running a washing machine or dishwasher, toward the hours when generation is highest.
FAQ
Frequently asked questions
One measures speed, the other measures distance travelled, which is genuinely the clearest way to keep the two straight when the numbers first start looking similar. kW tells you how fast your system is generating right at this instant; kWh tells you the actual total banked up over whatever period you're looking at.
Look at the pattern over weeks, not the number on any single day, which is the habit that actually separates a useful monitoring routine from an anxious one. Weather-driven dips come and go with the sky; a genuine fault shows up as a trend that persists regardless of what the weather is actually doing outside.
Self-consumption is the portion of your solar generation used directly by your home in real time, offsetting electricity you would otherwise buy at the retail tariff rate. Export is the surplus sent to the grid, credited at the lower SCT/ECIS rate. This split changes throughout the day and matters because self-consumed electricity saves you more per kWh than exported electricity earns.
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