Hi All, I am someone's last ditch effort to get their system working which has been non-functional since a few months after installation, 13 years ago...
After getting some new batteries in there, I can at least fire it up. It is a grid tie with battery backup situation with two Xantrex SW4048 inverters. Each inverter is kind of like its own system with two Outback MX60 CC's per inverter, and each inverter powers its own 120V backed up loads panel. They do not see each other until their 60A single pole breakers in the main panel. What seems to be happening is that after turning on the inverters the AC1 in good light will flash for about 30 seconds, then it syncs up to the grid and the light stays on solid. But then after a little bit, that light will start flashing, indicating that the utility power has been dropped, when it has not actually been dropped. Then at some point the backed up loads would lose power. The customer says that every 1-10 minutes, they would lose the backed up loads for 10-90 seconds. This happened all night long until they bypassed the inverters. There are a few other things of note: 1. There is a Xantrex GTI for each inverter. 2. I see in the manual there is information about stacking the inverters, but I am guessing in this setup this not necessary or would even be counter productive to stack the inverters. Not sure if the inverters not being stacked could cause one of them to unsync with the utility? 3. Neutrals and grounds are bonded in their main panel, but also in each of the Xantrex DC breaker boxes. I was going to separate them in the DC breaker boxes, but found that there is no way to isolate the battery negative bus from the box itself, and figured it would be dodgy to unground the enclosure. So I am also not sure if the multiple N-G bonds could be causing these issues. Does anyone have any ideas? Cheers, Dave *Dave Tedeyan, PE* Senior Engineer | Taitem Engineering, PC 110 South Albany Street | Ithaca, NY 14850 o. *607.277.1118 x121* f. 607.277.2119 www.taitem.com Solar • Sustainability • Energy • Design Certified B-Corporation since 2013
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