The System Work Mode is the core brain of your entire solar setup. It determines exactly how your inverter manages the flow of energy between your solar panels (PV), your battery bank, your home appliances (Load), and the main utility power grid.
Depending on your local electricity stability, utility pricing, and your energy goals, you will configure this screen differently.
Here is a breakdown of the three primary operating modes found on that page and what they actually do.
1. Selling First
This mode prioritizes maximizing financial return or maximizing solar usage over battery preservation.
How it works: Solar power immediately runs your home loads. Any excess solar power is routed straight out to the utility grid (if Solar Sell is enabled) or throttled.
The Battery: The battery is treated as a secondary backup. It will generally only charge if there is leftover solar power after your house is powered, or it stays at 100% waiting for a power outage.
2. Zero Export to Load
This is the most common mode used in regions with unreliable main grid power or where exporting to the grid is illegal/unrewarded.
How it works: The inverter installs a direct virtual wall at your main electricity meter. It ensures that your solar panels and batteries feed energy only to the appliances running inside your home.
The Benefit: It guarantees that absolutely zero watts of power escape out to the street grid, completely avoiding utility penalties or meter errors.
3. Zero Export to CT
This operates identically to Zero Export to Load, but with a major physical layout difference. It relies on a CT (Current Transformer) clamp snapped onto your main incoming grid lines.
How it works: If you have large, heavy-duty home appliances wired upstream (before the inverter's main backup output port), this mode allows the inverter to push solar power backward just far enough to feed those heavy loads, but stops right at the CT clamp so nothing leaks past it into the city grid.
Solar Sell is the toggle switch that allows your inverter to export (sell) excess solar electricity back into the public utility grid.
How the Inverter Behaves Based on This Setting:
When "Solar Sell" is ENABLED (Ticked) ✓
The inverter opens the floodgates for your solar production. It will follow this exact priority order for your PV (Photovoltaic) power:
- First, it powers whatever appliances are running in your house (Load).
- Second, if there is leftover solar power, it charges your Batteries.
- Third, if the batteries are full and your house loads are satisfied, all remaining excess solar power is pushed back into the grid.
The inverter strictly activates Zero Export mode.
If your house only needs 1 kW, and your battery is full, the inverter will instantly throttle (limit) the solar panels so they only produce exactly 1 kW.
Even if it’s the middle of a beautiful, sunny day and your panels could generate 5 kW, the inverter will force them to drop production to match your immediate domestic needs so nothing leaks back out to the grid.
Related Settings You Need to Watch:
If you turn Solar Sell on, you must look directly below it at the Max Sell Power (W) box:
This tells the inverter exactly how much power it is legally or safely allowed to push back into the grid.
For example, if your local utility company caps your solar export at 4 kW, or if your main grid circuit breaker is small, you should type 4000 into that box. The inverter will then clip any export right at that limit to keep your system safe and compliant.
A Note on Local Regulations: Only turn Solar Sell on if you have a net-metering agreement or official permission from your electricity provider. In regions without legal export frameworks, pushing power backwards into the street grid can result in heavy financial penalties, or it can trick older, non-smart utility meters into counting your exported electricity as consumed electricity, accidentally skyrocketing your utility bill.