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Subject Blocking diode in BP275?
Author Sascha Deri
> I have a Harris hydro electric system (12v, 660 amp storage) and am
> considering buying one BP-275 to provide a small charge when I have the
> hydro off for maintenance. I am using an Enermaxer controller to dump off
> the excess load to an air heater. My only question on the BP-275 is if it
> has a built in blocking diode to prevent discharge at night etc.?


The BP 75 does not have a blocking diode built in and I do not know of any solar panels that do have that feature. In most cases the charge controller serves that function but with a shunting controller you do not get that feature.

You can always install a blocking diode or some kind of a voltage sending relay in a box between the solar panel and the batteries. Or you can use a very small charge controller. Or you can accept a small amount of battery drain. With one solar panel the drain will be negligible.

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