( ( In ( a ( typical ( renewable ( energy system ) ) ) ) ) ( , ( ( battery voltage ) ( constantly ( ( fluctuates ( with ( the state-of-charge ) ) ) . ) ) ) ) )
(ROOT (S (PP (IN In) (NP (DT a) (JJ typical) (JJ renewable) (NN energy) (NN system))) (, ,) (NP (NN battery) (NN voltage)) (ADVP (RB constantly)) (VP (VBZ fluctuates) (PP (IN with) (NP (DT the) (NN state-of-charge)))) (. .)))
In a typical renewable energy system, battery voltage constantly fluctuates with the state-of-charge.
(ROOT (S (NP (NNP Voltage)) (VP (VP (VBZ is) (RB not) (NP (NP (DT the) (JJ same)) (PP (IN as) (NP (NN energy))))) (, ,) (CC but) (VP (VBZ means) (NP (NP (DT the) (NN energy)) (PP (IN per) (NP (NN unit) (NN charge)))))) (. .)))