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Stephen Otto avatar image

Making connection between wire and MPPT

I have a Smartsolar 150/70, and I'm trying to determine precisely how to connect my 10 AWG cable to the IN terminals of the controller. Do I simply toss my bare wire into the connector on the controller and screw down, or is there a crimp connector (with heat shrink) that I can use that will provide a more solid connection?

MPPT - Solar Charge Controllerwiring
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3 Answers
WKirby avatar image

Those rising clamp terminals are designed to be used with multi stranded wire for the most reliable connection.
I don't like to use a crimp or ferrule with rising clamp terminals. I use ferrules on screw down terminals though (the type where the screw it's self bears down onto the strands).

On page 19 of this rather excellent article written my Victron's Margreet Leeftink, there is a better description: https://www.dropbox.com/s/pdkngditufe0zfb/Wiring%20Unlimited.pdf?dl=1


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Need to get Margreet to revise her document then. She recommends ferrules for a "tidy job".

Pat

I agree with using ferrules for screw terminals - like she says.
Rising clamp terminals rely on the multiple strands to maximize the contact surface area.

I had revised my answer to clarify my meaning.

Your reply got me to thinking. So I did a little research online. I never knew the use of ferrules was controversial.

I agree with you that a correctly stripped and inserted wire works fine. That's what I did.

Pat

Pat Davitt avatar image

I just stripped the wires the proper amount, inserted them into the connectors, and torqued the screws to the correct value. Just make sure all the strands go into the connector. If you want to go completely professional, get some 10AWG Ferrules (requires a special crimping tool) and crimp them to the wire ends.

Pat

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Stephen Otto avatar image

As a follow-up, what gauge wire does Victron recommend for relays? Would 20 awg be fine?

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