Sunny Darwin skies, but a low number in your solar app? Your system may have run out of places to send the power.
What Your App Measures
| Term | What it means |
|---|---|
| Installed capacity | Panel rating under standard test conditions. |
| Available power | What conditions and equipment could deliver right now. |
| Actual production | Electricity the system really generates. |
A 10 kW panel rating does not mean 10 kW all day. Sunlight, shade, weather and equipment affect what is available. How panels are rated.
kW is the rate; kWh is the total. Like water flow versus a tank’s volume: 4 kW for two hours produces 8 kWh.
Think of a Water Supply
Open taps: appliances take the power they need.
A storage tank: it needs room and a suitable charging rate.
A shared outlet: export must stay within your approved limit.
A full tank cannot keep filling, and the grid outlet has an approved flow limit. The inverter turns down when these destinations cannot take the surplus. How export limiting works.
Like a bakery making 40 loaves because it has only 40 orders, the system records what it actually makes—not everything it could make.
Low home use alone does not cause throttling. If battery charging or permitted export can absorb the surplus, production can continue.
Same Sunshine, Different Production
Three households. Identical systems: 10 kW of solar, a 10 kW inverter, 10 kWh of usable battery storage and a 5 kW single-phase export limit. Each has the same sunshine and a potential 50 kWh of solar for the day. Their energy use tells three different stories.
Full battery, quiet day
20 kWh (40%) unused potential
Their battery starts full. The home uses 5 kWh during solar hours and exports 25 kWh. With no battery space and export capped, the system turns down.
An empty battery to refill
10 kWh (20%) unused potential
They used 100% of their battery’s usable energy overnight. Their home also uses 5 kWh and exports 25 kWh, but solar puts another 10 kWh into the battery.
A refill and a busier home
0 kWh (0%) unused potential
They also emptied the usable battery overnight. Pool pumping, air conditioning and other daytime use take 15 kWh, while 10 kWh refills the battery and 25 kWh goes to the grid.
| Household | Home | Battery | Grid | Solar |
|---|---|---|---|---|
| Household 1 | 5 kWh | 0 kWh | 25 kWh | 30 kWh |
| Household 2 | 5 kWh | 10 kWh | 25 kWh | 40 kWh |
| Household 3 | 15 kWh | 10 kWh | 25 kWh | 50 kWh |
Same equipment, different demand. Household 2 produces more because its battery has room. Household 3 produces more again because the home needs more energy.
Why Output Drops When the Battery Fills
Charging finishes, so one destination disappears. With unchanged sunshine, production can fall from 10 kW to 6 kW because the battery no longer takes 4 kW.
A battery also has a charging-rate limit. Even when partly empty, it cannot accept unlimited power. Operating schedules can change charging behaviour.
Read the Whole App
The inverter and monitoring meter send readings to your app. Check solar, home use, battery charging and grid export together—plus the last update time.
Export is only one destination, not your total production. Battery discharge is stored energy being used, not newly generated solar. A stale app reading does not prove generation stopped.
App labels and measurement points vary. Understanding monitoring.
When Should We Check Your System?
A full battery, low home use and export at its ceiling suggest normal limiting. They are clues, not proof. Clouds, shading, equipment limits, grid voltage or faults can also reduce output.
Contact us about repeated faults or low output in good conditions when demand or charging/export capacity appears available. Send:
- The date, time and weather.
- A screenshot of all energy flows and the battery percentage.
- The day’s graph and any warning message.
Leave export and grid-protection settings to your installer.
Make More of Your Solar
Move jobs you already need—pool pumping, washing or EV charging—into suitable solar hours. Do not waste electricity just to improve the graph.
Compare production alongside household use, battery activity and export settings. A bigger daily total is not automatically a better result.
Unsure what your readings mean? Send Top End Solar the full picture and we’ll help you understand it.
Ask Us About Your Solar →