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Hello Chris,<br>
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Stage 0 is what we would consider the state of the inverter before it reaches normal. Once you reach normal (stage 1) that is when you will begin outputting power, inverting power from solar, etc.</div>
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Best Regards,<br>
<br>
Jharen Poole<br>
Applications Engineer II<br>
972-575-8875</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> RE-wrenches <re-wrenches-bounces@lists.re-wrenches.org> on behalf of Christopher Warfel via RE-wrenches <re-wrenches@lists.re-wrenches.org><br>
<b>Sent:</b> Thursday, November 14, 2024 8:37 AM<br>
<b>To:</b> re-wrenches@lists.re-wrenches.org <re-wrenches@lists.re-wrenches.org><br>
<b>Cc:</b> Christopher Warfel <cwarfel@entech-engineering.com><br>
<b>Subject:</b> Re: [RE-wrenches] More Issues with Parallel Sol-Ark 15K System</font>
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<p>Can you point to a reference to what stage 0 is? This is a new term for me. So far, have not installed multiple Sol-Ark inverters at one site. Thank you, Chris<br>
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<div class="x_moz-cite-prefix">On 11/12/2024 12:50 PM, Poole, Jharen via RE-wrenches wrote:<br>
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Our inverters utilize CANbus communications for establishing parallel operation between multiple Sol-Ark inverters. CANbus communication operates as a serial communication protocol. In this setup each inverter in the setup is linked via a parallel communication
cable forming a daisy-chain configuration. If one inverter in the chain experiences a shutdown due to a fault, the communication chain is disrupted. Consequently, the other inverters will also power down when we see this loss, ensuring system protection and
safeguarding the customer’s investment.</div>
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Paralleling must be done at a stage 0 they have to sync and that is done in the pre normal mode, functionality wise having them going into sync is extremely difficult due to timing issues. It's easier to time it from a stage 0 than to do it when one unit is
already running.<br>
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Maintaining synchronization between inverters is critical; if the inverters were to operate out of parallel it can result in conflicts between the operation of inverters and desynchronization of the units. This misalignment can escalate, potentially causing
significant damage to one or more inverters and risking harm to other connected equipment.</div>
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Best Regards,<br>
<br>
Jharen Poole<br>
Applications Engineer II<br>
972-575-8875</div>
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<pre class="x_moz-quote-pre">_______________________________________________
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<pre class="x_moz-signature" cols="72">--
Christopher Warfel, PE
Entech Engineering, Inc.
POB 871 Block Island, RI 02807
401-447-5773</pre>
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