How many solar inverters you need per solar panel depends on factors such as the type, size, voltage and power of your solar power system. In general, there are several common scenarios:
Off-grid solar systems
If your system is off-grid, which means it is not connected to the grid and only uses batteries to store electricity, then you can choose the right inverter based on your load power and battery voltage. For example, if your load power is 1000W and the battery voltage is 12V, then you can choose a 12V/1000W off-grid inverter, so that you can convert the DC power from the battery to AC power to supply the load. If the total power of your solar panels is 3000W, then you can divide them into 3 groups, connect a certain number of panels in series in each group, and then connect them in parallel to the DC input of the inverter. In this way, each solar panel requires only one third of the power of an inverter.
Grid-tied solar system
If your system is a grid-tied system, which means it is connected to the grid and can sell excess power to the grid, then you can choose the right inverter based on the total power of your solar panels and the grid voltage. For example, if the total power of your solar panels is 3000W and the grid voltage is 220V, then you can choose a 220V/3000W grid-tie inverter so that you can convert the DC power from your solar panels into AC power that is the same as the grid, which will be metered and fed back through the meter. If the total power of your solar panels is 6000W, then you can divide them into 2 groups, connect a certain number of panels in series in each group, and then connect them in parallel to the DC input of the inverter. This way, each solar panel only needs half the power of one inverter.
Hybrid Solar System
If your system is a hybrid system, which means that it can operate off-grid as well as on-grid, and you can flexibly switch the working mode according to the actual demand, then you can choose the right inverter according to the total power of your solar panels, the battery voltage and the grid voltage. For example, if the total power of your solar panels is 3000W, the battery voltage is 24V, and the grid voltage is 220V, then you can choose a 24V/220V/3000W hybrid inverter, so that you can convert the DC power from the battery to AC power for supplying to the loads in off-grid mode, and convert the DC power from the solar panels to the same AC power as that from the grid in grid-connected mode. AC power, which is metered and fed back through the meter. If the total power of your solar panels is 6000W, then you can divide them into 2 groups, connect a certain number of panels in series in each group, and then connect them in parallel to the DC input of the inverter. This way, each solar panel only needs half the power of one inverter.