Backfeeding panels


Author Message
mab1
Regular Member

Joined: 10/02/2015
Location: United Kingdom
Posts: 48
Posted: 06:40pm 25 Oct 2020      

Strictly speaking you should have a blocking diode; the diodes in the connection boxes of household panels are usually 'bypass' diodes to allow part of the panel to work when another part is shaded.

It's less important nowadays with modern panels as the back leakage is much less than on panels from the last century, but it is still there: I've just popped out to put a meter across the blocking diode for a 2 panel array of 30v 60cell 235w panels i've got feeding into my 24v battery: the backfeed current was 27mA.