Bill – A couple items: 1. The 30000TL-US (along with all the STP TL-US line) has been discontinued, and I believe this particular model has been completely sold out. Some Distributors may have stock remaining or you may have already obtained the unit. As Blake noted, if you use this model, it is critical to pay attention to service connection requirements. See technical document: https://files.sma.de/dl/7418/STP-US_MV_Trafo-TI-en-13.pdf and particularly the table and notes below on page 3. 2. Not sure where the array is located on this residential property, but single family dwelling roofs are limited to 600V (2014 NEC 690.7(C) or 2017 NEC 690.7). If that is where the array is, perhaps the 33kW CORE1-US-41 inverter would be an option – it is designed to work with high efficiency down to the 350VDC level. The 50kW and 62.5kW units are designed to work best with arrays closer to the 1000VDC limit – ok if the array is a large ground mount or possibly non-dwelling unit roof. This inverter family requires a 277/480 wye service, so a transformer would be required. Transformer requirements for the CORE1 family can also be found in the above linked document. Best- Mike
From: RE-wrenches <re-wrenches-boun...@lists.re-wrenches.org> On Behalf Of Blake Gleason Sent: Thursday, April 18, 2019 5:20 PM To: RE-wrenches <re-wrenches@lists.re-wrenches.org> Subject: Re: [RE-wrenches] 1000 volt Bill, Watch out for the 480 delta with the SMA inverter. Even though the product literature says it works, it doesn't. If there's ever a ground fault (PV system or customer facility wiring) on one of the 480 legs, the other two legs will jump to 480V to ground (with much higher spikes along the way) and blow up the varistors on the inverter output stage which are not rated for this condition. We learned this the hard way with 10 out of 24 inverters suffering complete failures on one project shortly after they were installed. We're talking catastrophic component failure with bits of varistor all over the inverter boards and adjacent components scorched. In the end, we installed a 750kVA 480 wye to 480 delta isolation transformer to provide a reliable ground reference for the inverters. In the process of solving this problem, we learned of several other sites with the same issue... Best, Blake Sun Light & Power On Thu, Apr 18, 2019 at 3:44 PM frenergy <frene...@psln.com<mailto:frene...@psln.com>> wrote: Wrenches, I'm tackling a huge residential system that requires back-feeding the grid at 480 volts, delta (no neutral, right?). We're going to GT 30-50 KW. The SMA SB30000TL-US-10 is one of the few inverters (apparently) that can do this, which I'm planning to use. The inverter can be fed up to 1,000 vdc,OC. 1,000 volt array is new to me. I assume they have to accept the high voltage because its a 30K inverter with only 2 MPPT strings. My question: Other than not getting fried during installation, what's different about wiring the array or anything else on the DC side? I don't see anything in our current (2014) code cycle on this that's different than 600 volt. Tips, advice? Any links, past webinars, whatever else also helpful would be welcome. Thanks, Bill On 4/18/2019 2:32 PM, Starlight Solar Power Systems wrote: Hi Chris, SWRC is the remote part name. SW-4024 is the inverter/charge. I believe all the Trace products from that era use the same BTS with RJ11 plug so that should not be a problem. Larry [cid:16a32b673f0cc3c664a1] On Apr 18, 2019, at 10:33 AM, ch...@oasismontana.com<mailto:ch...@oasismontana.com> wrote: Hi Folks: Does anyone have a line on a remote option and battery temp sensor for a SW-RC4024 (in a customer’s motor coach)? If so, please contact me off list. Thanks. 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