Re: [RE-wrenches] APS rapid shutdown

[Brian Mehalic via RE-wrenches]

Not sure about #2 or #3, but 100% yes on #1, which quite a few people (including the mfg?) “learned the hard way.” Brian On Oct 31, 2024, at 6:57 AM, Dave Tedeyan via RE-wrenches <re-wrenches@lists.re-wrenches.org> wrote:  Hi All,  I am about to use the AP systems rapid shutdown units for the first time (pairing with SMA inverters). I was reading through the manual and came across a couple things that I am wondering if others have noticed issues with: 1. The manual states that you need to keep the PV conductors from each inverter (there are two in this system) separate, or else there may be crosstalk. So this would imply that you need to have two separate DC conduits from the roof to the inverters, rather than one. Has anyone noticed if this is truly a concern? 2. The manual also states that there needs to be at least 20cm (or ~8") from the RSD-S-PLC to another piece of equipment (other than the module it is mounted on). I am attaching a diagram from the manual, but it sounds like if you have three rows of modules, the RSD's need to be installed on the top of the top row, the bottom of the bottom row, and you need an 8" gap between the rows for the middle row. The diagram in the manual makes this more clear than my words can. But has anyone not installed this large gap and had issues, or did it still work just fine? 3. Lastly, I don't see a mention in the manual, but is there a string length minimum? For some reason I thought with some of the older Tigo RSD units you needed at least 5 or 6 in a string, or maybe I am thinking of SolarEdge optimizers. I just want to make sure there is no minimum, since another job coming up will have a string of 3 panels. I appreciate your experience! Cheers, Dave -- Dave Tedeyan, P.E. Owner | Sungineer Solar p: he | him | his a: 1653 Slaterville Rd. | Ithaca, NY 14850 w: www.sungineersolar.com c: (607) 270-0370 <aps rsd.pdf> _______________________________________________ List sponsored by Redwood Alliance Pay optional member dues here: http://re-wrenches.org List Address: RE-wrenches@lists.re-wrenches.org Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org There are two list archives for searching. When one doesn't work, try the other: https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: http://www.re-wrenches.org/etiquette.htm Check out or update participant bios: http://www.members.re-wrenches.org

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