I have figured it out and digital pots won’t work on many applications, too limited. They cannot block the 200V, around 2.15mA for 3 meter from inverter. If we were to block it from the battery, the current that flows from the battery is too high (around 20mA permeter). Digital potentiometers are too low power.
The closest thing to use a digital potentiometer is: Each continuous EL wire segments cannot have more than 1 meter. An inverter is needed for every segment of EL wire.