Hello Jason,
Just a bit late on this one but for what it's worth;
I would inquire with the end-user if there was any abnormal AC issues that caused the Inverter to error-out with AC type errors(VAC, FAC) prior to this K1-open error.
Many times these abnormalities can then generate a false K1-open error that can lock-up the Inverter.
Power Cycling will Not clear the K1-open error once it is locked-in.
However using Sunny Data with the Comm. port/PC you can log-in as Installer level and Reset errors to clear the K1-open error(some models of SB's you can use test jumpers on the control board to accomplish this also).
You will either get a new K1-open error if there is indeed a bad Grid relay/driver issue or the Inverter will start operating normally!
Last year I had a SB3000U with a K1-open that was locked-in;I cleared the error;all ok;no "real" Grid Relay failure.
It turned out that the end-user had a back-up Generator and this K1-open error happened when he was performing a Generator exercise routine...
The Grid Relays can/do go bad pitted/burned contacts typically or unable to close due to relay mechanical package deformities(heat/cool cycles over time).
This is a easy fix however when it is a bad Grid Relay;simply replace(I would do All of them) and good to go.
I take that SMA will no longer do Repairs/Support on this SB3300U model just like the SB1800U & SB2500U; their are others that will.
Louis, SolarCowboyz
-------- Original Message --------
Subject: Re: [RE-wrenches] K1-Open Fault on SMA SB
From: Jason Szumlanski <[email protected]>
Date: Wed, June 29, 2016 1:40 pm
To: RE-wrenches <[email protected]>
It's out of warranty. 10 year old SB3300U.Went out today. Everything checked out on the AC and DC side, fuses, etc. Looks like a dead duck. Owner went for a new SB3000TL.Thanks for the feedback everyone!JasonOn Wed, Jun 29, 2016 at 10:00 AM, Peter Giroux <[email protected]> wrote:JasonFear not, I have had two in the last year and they were fantastic. Sent out new inverters as soon as I sent on the model and serial #'s. K-1 is not usually fixable so they send out new or refurbed units.Apparently it is caused by high voltage on the line side and after X # of times the relay just locks open. Enjoy.peter girouxAmerican Solar----- Original Message -----From: Jason SzumlanskiTo: RE-wrenchesSent: Tuesday, June 28, 2016 12:37 PMSubject: [RE-wrenches] K1-Open Fault on SMA SBI'm heading out on my first K1-Open fault code on a SMA inverter. Any tips for diagnostic steps and likely outcome? I'm dreading the call to SMA based on recent feedback about their customer support.Jason Szumlanski
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