Καλησπερα παιδια.Επειδη το ζητημα με ενδιαφερει και εμενα και μαλιστα αμεσα, παραθετω τι γραφει το "Planning and installing photovoltaic systems-A guide for installers, architects and engineers" :
"Where DC-to-DC converters are used,
additional losses occur, partially cancelling out the transformer losses that are
avoided. The lack of electrical isolation between DC and AC power circuits in
transformerless inverters creates high requirements for the electrical safety concept.
The Verband der Elektrizitatswirtschaft (VDEW) guidelines for the parallel operation
of own-generation systems contains the following stipulation: 'in own-generation
systems with inverter and without isolating transformer, DIN VDE 0126 requires the
installation of a universal current (AC/DC) sensitive residual current device (RCD)'.
'Universal current sensitivity' refers to the protective device's reaction to faults on the
DC and on the AC side. Today, universal current sensitive RCDs for transformerless
inverters are offered that ensure electrical safety. It is possible to integrate the
protective circuit within the ENS/MSD. In PV systems with transformerless inverters,
capacitive discharge currents of over 30 milliamperes (mA) during normal operation
can flow to earth via the PV modules. For this reason, conventional RCD protective
devices, which trip at 30mA, cannot be used."
Εχω ακουσει και τις δυο αποψεις αλλα δεν εχω καταληξει.Υποθετω οτι οι πιο εμπειροι μπορουν να απαντησουν απο την πρακτικη τους εμπειρια.
Εαν τελικα τοποθετηθει ΔΔΕ ,φυσικα οχι στα 30mA, τι προβλημα μπορει να δημιουργηθει?Stayros μπορεις να γινεις πιο συγκεκριμενος?