reduce voltage for inverter in solar system
Seems unusual that inverter cuts out at 13.4V, considering a battery in vehicle can get to 14.4V when charging. Any inverter designed for 12V input would expect to be running off vehicle 12V system. I would suggest you don't try to reduce voltage, as you'll lose precious power. Better to double check your inverter is configured for 12V battery input or get one that works above 13.4V. If you're only option is to reduce the voltage, use an efficient step down DC-DC to give constant 12V.