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Forum Index : Electronics : is a Blocking diode needed here

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Rubes
Newbie

Joined: 01/05/2009
Location:
Posts: 36

Posted: 01:47pm 07 Jan 2017

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Hi all again
I have a f&P micro hydro genny connected to bridge rectifiers which will then feed a mppt controller for 12v battery charging, the question is does the bridge rectifier setup act like a blocking diode to stop current from going from batteries via the charge controller back to the genny or do I need to put another diode inline after the bridge rectifiers and if so any suggestions on which one.
Thanks

Downwind

Guru

Joined: 09/09/2009
Location: Australia
Posts: 2333

Posted: 04:46pm 07 Jan 2017

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The bridge will act as a blocking diode between battery and generator.
One of the few times a blocking diode is used is to prevent a dump load discharging the batteries when the generator load is diverted to dump.
For a hydro system there is most likely no need for a dump load as to disconnect the geny from the batteries would not really hurt anything because it is not likely to runaway in overspeed like a windmill will.

Sometimes it just works

Rubes
Newbie

Joined: 01/05/2009
Location:
Posts: 36

Posted: 06:50pm 07 Jan 2017

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Thanks Downwind thats all I need to know, and yes because of limited head on the hydro plant the unloaded rpm is acceptable so I am not running a dump load.

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