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L'innovazione del fotovoltaico

Pubblicato il 24 giugno 2018 alle 11.00


Parliamo un po' del fotovoltaico, ovvero quello che converte direttamente la luce del sole in elettricità senza alcuna parte in movimento, rumore od emissioni di qualsiasi natura

Il settore fotovoltaico italiano è in procinto di vivere una nuova fase molto importante del suo percorso di crescita.
I target europei appena definiti per le fonti rinnovabili (32%) dal recente trilogo comunitario richiederanno molti sforzi su diversi fronti. Il consumatore finale è il grande protagonista di questa nuova stagione del settore energetico: lo sottolinea senza ambiguità il ‘Clean Energy Package’ recentemente pubblicato dalla Commissione Europea e lo ripetono costantemente politici di ogni schieramento.

Per comprendere l’innovazione che ha riguardato la tecnologia del fotovoltaico negli ultimi anni basta guardare due numeri: 15 e 5. Sono i grammi di silicio richiesti per produrre 1 W in condizioni di test standard con una cella solare in silicio cristallino, rispettivamente, nel 2005 e nel 2013.

Nel mondo ormai si installano oltre 100 GW di fotovoltaico all’anno, e le celle solari in silicio si approssimano ad un punto di svolta. Al posto di quelle convenzionali con cui si raggiungevano livelli di efficienza vicini al 20%, sta per iniziare la produzione di massa delle nuove celle di tipo PERC (Passivated Emitter and Rear Cell), il cui livello di efficienza è del 22,61% per le celle in silicio monocristallino PERC, e del 21,63% per quelle in silicio multicristallino PERC. Le celle solari in silicio policristallino, che attualmente costituiscono circa il 70% di quelle ad oggi prodotte, sono basate sulla tecnologia Al-BSF (Aluminium Back Surface Field) arrivando ad una più che rispettabile efficienza del 18,3%. Ora, verranno rapidamente sostituite da quelle con l’architettura PERC in cui le proprietà elettroniche ed ottiche della superficie posteriore della cella vengono radicalmente migliorate passivando la superficie e creando al contempo delle aperture localizzate al fine di facilitare la cattura della luce in prossimità della superficie posteriore: in questo modo si massimizza la liberazione e la cattura degli elettroni propria dell’effetto fotovoltaico all’interno dei diodi a contatto.


Nel campo del fotovoltaico la convenienza economica dell’installazione di un impianto in Italia si fonda oggi, oltre che sulla detrazione fiscale al 50%, sulla possibilità di autoconsumare l’energia generata, risparmiando così sui costi in bolletta, soprattutto sulla parte degli oneri, compresi quelli legati alle fonti rinnovabili stesse.


Ultimamente è nato anche un mini impianto fotovoltaico per chi, ad oggi, non ha potuto installare un impianto tradizionale perchè in affitto, oppure in zona a vincolo di varia natura, per mancanza di tetto, condominio, lido balneare, terreni adibiti all'agricoltura. Il microfotovoltaico da gli stessi vantaggi di un impianto da 3kwh con accumolo senza però impegnare il tetto e senza installare le batterie. Una volta installato alla presa vicina, genera direttamente corrente di immediato utilizzo grazie ad una elettronica interna che gli permette di trasformare l'elettricità prodotta dal sole direttamente in corrente Alternata. E' di facilissima installazione tramite una staffa verticale con tre fori per il posizionamento a muro, e può occupare una superficie di massimo 2mq.


Contattaci per avere maggiori informazioni sul settore del fotovoltaico e scoprire come puoi riparmiare anche tu!


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