I have a Fox ESS KH10 inverter, and wondering what is the maximum number of panels I can use with it?
The data sheet says Max. Array Power [Wp] is 20000 but Max. Input Power [W] is 15000. So does that mean I can have 20kW of panels or 15kW of panels?
Thanks!
From my understanding, the 20kWp value means 'p' for Peak.
So you could have 40x 500W panels that would calculate to 20kWp.
Maybe the 15kW refers to the long term power input?
So you could have 40x 500W panels that would calculate to 20kWp.
Maybe the 15kW refers to the long term power input?
I also posted to technical support and they got back to me with these replies....
For the KH10 inverter:
- Max. Array Power (20,000Wp) refers to the maximum recommended total solar panel capacity that can be connected to the inverter.
This means you can oversize the PV array up to approximately 20kW of panels, which is common practice and helps improve generation during low irradiance conditions (morning, afternoon, cloudy weather, etc.).
- Max. Input Power (15,000W) refers to the maximum DC input power the inverter can actively process at one time.
However, the inverter output/input processing capability is still limited, so during peak solar conditions the inverter may clip or limit power above its maximum operating input/output range.
Please also ensure:
- MPPT voltage/current limits are respected
- String design complies with the inverter specifications
- Local grid regulations and installer guidelines are followed
The number of panels that can be installed per MPPT depends on the panel specifications, especially the panel voltage (Voc/Vmp) and current.
For the KH10 inverter, the key limits per MPPT are:
- Max DC voltage: 600V
- MPPT operating voltage range: 80–500V
In most typical installations, this usually works out to approximately 8–12 panels per MPPT/string when using standard modern solar panels.
- Max input current per MPPT: 16A
However, the exact number should always be calculated based on the specific panel model and local temperature conditions to ensure the voltage does not exceed inverter limits during cold weather.
Marvellous stuff, at least you know for sure what the limits are.
Yes. I'm thinking about whether I should get some more panels now I have a battery and can get more than the 133%.