How to Read Your Solar Monitoring App

The big difference between apps isn’t the software — it’s whether each panel reports for itself. Enphase microinverters and SolarEdge power optimizers put a small piece of electronics behind every panel, so the app can draw a roof layout and show each panel’s output. That’s handy: if one panel sits in afternoon shade or under a leaf, you’ll see just that tile drop while its neighbors stay bright.

A Tesla system (and most other string inverters) wires panels together in series into one inverter, so the app reports a single whole-system number. That’s not worse for everyday use — you still see total production, home use, grid flow, and Powerwall charge — but you can’t isolate one underperforming panel from the app alone. Which approach suits you is a hardware question we cover in Enphase vs SolarEdge.

Open the day view and you’ll see production as a curve across the hours. On a clear day it looks like a smooth bell: near zero at dawn, ramping up through the morning, peaking around midday when the sun is highest, then tapering to zero at dusk. In California that peak sits roughly in the late-morning-to-early-afternoon window, and it’s lower and narrower in winter than in summer because the days are shorter and the sun is lower — that seasonal dip is expected, not a fault.

Weather rewrites the curve in ways that are completely normal. Passing clouds make the line jagged, with sharp dips and rebounds through the day. A fully overcast or rainy day flattens the bell into a low bump — panels still make some power from diffuse light, just less of it. A curve that’s a bit lower every day for weeks, on the other hand, can point to soiling (dust, pollen, or ash) building up on the glass; a rinse often restores it — see solar panel maintenance in California.

If your system has consumption monitoring, the app overlays two lines: what you make and what you use. Where production sits above consumption, you’re exporting; where use sits above production (mornings, evenings, cloudy spells), you’re importing. Reading those two lines together is the whole game under California’s current rules.

On the Net Billing Tariff (NEM 3.0) — which applies to SCE, PG&E and SDG&E — exported solar earns a time-varying credit that’s usually far below the retail rate (an illustrative 5–8¢/kWh at common midday hours, with a few late-summer evening hours worth much more). That flips the strategy toward self-consumption: using your own solar as it’s made is worth more than exporting it. Your app is the tool for that — watch the two lines and shift heavy loads (EV charging, laundry, pool pump, pre-cooling) into the midday hours when your own production is high. Full detail in NEM 3.0 explained. Note that LADWP is a municipal utility that runs its own solar rate schedules (not the CPUC Net Billing Tariff) — confirm your current schedule with LADWP, since the best times to self-consume can differ.

Here’s the one that scares people: you open the app and see a flat line or “no data.” Nine times out of ten that’s a communication gap, not a power gap. Your monitoring reports over Wi‑Fi, Ethernet, or a cellular link; if your home internet hiccups, the router gets changed, or the gateway loses signal, the app simply stops receiving data. The panels and inverter keep making power the whole time — the system doesn’t need the internet to generate electricity. When the link comes back, most systems backfill the missing hours so the gap fills in later.

So when should you actually worry? If the app shows zero production in the middle of a sunny day and everything else in the house has power, or an inverter fault/offline that doesn’t clear after the internet is confirmed working, that’s a real signal — not just a missing bar on the chart. A data gap overnight or during an outage is nothing to chase.

Bottom line: your monitoring app answers one question every day — “is my system doing what it should?” Learn the shape of a normal curve, keep an eye on production vs use, and treat a blank screen as a data problem until proven otherwise. If a curve ever looks wrong to you, send us a screenshot and we’ll tell you whether it’s healthy.