Sun King Home 40 Plus uses a detachable solar panel with a repairable junction box and a 5 metre cable. The 5.5W aluminumframed industrial grade glass protected solar panel is far more durable than alternatives based on polycarbonate or epoxy encapsulation both of which degrade quickly in harsh environmentsppBATTERY LIFE The Sun King Home 40 Plus has one of the best NMC batteries available in todays market On average daytoday use the Sun King Home 40 Plus lithiumion NMC battery lasts twice as long as other typical NMC batteries and could last even longer on an average two days chargingp