Author Topic: Brat charging question  (Read 474 times)

qrper

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Brat charging question
« on: July 12, 2020, 06:52:35 PM »
Okay...

Question about the brat.

When charging, the wires to/from the PV, do they carry the full current of the battery?

For example, if someone would short out the PV input wires, would the battery dump its current into the PV side of the controller? Or, only the short circuit current of the PV panels?

The old school PWM controllers always had a 'blocking diode' that would prevent that from happening.

I know that a pair of FET back to back will serve the same function as a diode, and I wonder if the Brat does that as well.

Trying to determine what size fuses to put in the system

mike
System one: 7kWp w/ Trina 250 W panels @90 Vdc. Classic 150 to 16-6 V U.S batteries. Trace 5548 sine wave inverter.
System two: 6kWp grid tie with solaredge inverter.
System three: Midnite Brat, two 120 W Astropower modules, 100 Ah battery. Runs the LED streetlight in the back yard.

FNG

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Re: Brat charging question
« Reply #1 on: July 13, 2020, 04:53:07 PM »
Just the ISC of the modules unless there was some major failure.

qrper

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Re: Brat charging question
« Reply #2 on: July 14, 2020, 11:08:07 AM »
That's exactly what I wanted to know!

many thanks.

mike
System one: 7kWp w/ Trina 250 W panels @90 Vdc. Classic 150 to 16-6 V U.S batteries. Trace 5548 sine wave inverter.
System two: 6kWp grid tie with solaredge inverter.
System three: Midnite Brat, two 120 W Astropower modules, 100 Ah battery. Runs the LED streetlight in the back yard.