Why do solar cells need an inverter? a. they need a way to share their excess energy with the electric company. b. their energy output is alternating current. c. they need a way to store energy for cloudy days. d. their energy output is direct current.

D. Their energy output is in the form of direct current.

Explanation:

The inverter converts the DC to AC so that the appliances that use ac may function. They are mostly connected after the power storage appliances normally batteries before the consumption appliances. Inverters convert direct current electrical energy to alternating current at a given voltage and frequency.

a "theory" a suggestion that is not 100 % accurate, or a figure. some people say its a theory because they of all the passed theory's about one subject. it depends sometimes theory might be accurate and sometimes they are.