LV6548 Failed built-in MC4 connections

Jazzmonger · Nov 2, 2022

One of my LV6548 inverters mc4 connectors failed and I got 0v on PV1. Voltage on the incoming wires is fine. Anyone else had this happen? This is a REALLY bad design on an otherwise great inverter.

I just ordered a couple of these to bypass the mc4 connectors and hardwire directly to the internal circuit board.

wrench 87 · Nov 2, 2022

they use crimp on flag connectors that plug onto the circuit board inside the unit. I have the sungold power sp 6548 inverters and l am looking into removing the mc4 connectors also. I like the way the new ec4 inverters just use terminal blocks but the circuit board is a little different.

Supervstech · Nov 2, 2022

Jazzmonger said:
One of my LV6548 inverters mc4 connectors failed and I got 0v on PV1. Voltage on the incoming wires is fine. Anyone else had this happen? This is a REALLY bad design on an otherwise great inverter.

I just ordered a couple of these to bypass the mc4 connectors and hardwire directly to the internal circuit board.

View attachment 118836

What amperage were you feeding it?

wrench 87 · Nov 2, 2022

I am just gathering parts i do not have a system up and running yet, I would like top fabricate a new metal plate and run conduit for the pv wires.
I am unsure the size of the wire on the circuit board?.

Jazzmonger · Nov 2, 2022

wrench 87 said:
I am just gathering parts i do not have a system up and running yet, I would like top fabricate a new metal plate and run conduit for the pv wires.
I am unsure the size of the wire on the circuit board?.

Awg10. Just like pv cable.

This inverter gets about 15-16 amps on each input. They are rated for 18 amps max.
The only reason I'm going to use a terminal post is to be able to remove the wires for some reason in the future.

If you're hard wiring with conduit, just remove the mp4 wire and use a flag connector on the pv wires or solder them directly to the flag. No way they can fail doing that.

Jeff

Wally 4243 · Aug 22, 2023

Hello Jeff. What is the part called and where did you get it? I am have the same problem with my 6548. I need to get it fixed asap. Thank you for posting this. It helped me stay sane.

Wally

Quattrohead · Aug 22, 2023

Search for Terminal Blocks on Amazon etc.

Wally 4243 · Aug 22, 2023

Thank you. I ordered the terminal block and flag connectors. I am excited to get it fixed. I hope I can do it. Doesn't look very difficult. Thanks again.

LV6548 Failed built-in MC4 connections

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