I must have missed this in your post! https://solar.schneider-electric.com/solution/centralised-solar-power-plants-1500v/
You can navigate to their engineering team. I have found that once you have a case number you communicate easily with e-mail. --Dave > I appreciate everyone's replies so far. First, we already have an > electronic soft start control, it just needs to be reprogrammed to > reduce the starting surge more. Second, we are way beyond 48v land. We > are in the realm of commercial scale inverters of at least 500 kW to 1.5 > MW. They will be running at 600 vdc min and probably 1500 v range. > Output is 480v 3 phase. > > When I mentioned SMA, it was not their Sunny Island, its their larger > scale Grid tie equipment syncing to a generator. > > https://www.sma-america.com/industrial-systems/pv-diesel-hybrid-applications.html > > Most of the inverters we are looking at are primarily being used with > batteries for peak shaving to reduce demand charges on grid. Some, such > as Dynapower can work off grid, but I am not finding evidence that > anyone has much real life field experience off grid. Princeton Power > has their 100 kW inverter in Haiti forming a micro-grid, but I have very > few details at the moment. > > Even if your experience with these large battery inverters is just on > grid, I'd love to hear about it. Offline is fine, if its not all good > news. > > Thanks, > > Ray Walters > > Remote Solar > > > On 4/26/18 5:23 PM, Kevin Pegg wrote: >> Hello Ray, >> >> I have a couple 60/100 kW SMA Sunny Island systems out there, systems >> with 100 kW generators, 400 kWh battery banks and generally token >> renewable inputs. I feel with this configuration we close maxing out >> what can be done with 48VDC. >> >> Getting into the MW scale scares me to be honest. I think that will be >> well beyond what can be handled at 48VDC and is well beyond capacity of >> the SMA systems. Really need to look into higher DC voltages to handle >> this kind of current. >> >> If this was my client I would first look to the loads and see if there >> are any alternatives to the 250 HP motor. I have learned there are often >> massive levels of engineering overkill in the industrial world. What is >> the duty cycle of that motor, what does it do, etc? Would they be better >> to go directly diesel for that? >> >> In terms of system designs I'd investigate a direct diesel/PV interface >> skipping battery storage. Perhaps a group of 250 kW synchronized >> generators that can ramp up/down based on demand. Perhaps similar tech >> to what Tesla is doing in Australia. >> >> Kevin >> >> >> -----Original Message----- >> From: RE-wrenches [mailto:[email protected]] On >> Behalf Of Ray >> Sent: April-25-18 12:37 PM >> To: RE-wrenches <[email protected]> >> Subject: [RE-wrenches] Large Off Grid Inverter? >> >> Greetings Fellow Wrenches; >> >> We are consulting on a power system for a large off grid facility that >> is currently operating on a 1500 kW gen set. The loads are enormous >> for normal off grid: in the neighborhood of 600 amps continuous at 480 v >> 3 phase. Surges are close to 2000 amps, but we are working on control >> programming to bring that number down substantially. That is due >> primarily to a 250 Hp motor start. (that's not a typo!). EPA and local >> regulations are dictating that the current generator be retired in the >> near future. Grid power is a possibility, but we need to offer a >> viable off grid option as well. >> >> My question to the group: does anyone have real off grid experience with >> large format battery based inverters?  I've heard of some micro-grid >> systems running in Haiti on Princeton Power inverters, and Dynapower has >> a 250 kW inverter that has a "grid forming" mode. As we all know, it >> is easier to make claims in spec sheets than to deliver hard motor >> starting power in a remote location. We need proven products, with a >> track record of reliability. >> >> We are considering SMA type systems that use AC coupled PV to offset >> fuel consumption of a generator, but those seem dependent on the >> generator to maintain the stability of the micro grid during hard >> starting loads. Ideally we would want to reduce the generator run time >> to under 200 hrs/ yr and reduce its size to 500 kW. We have excellent >> solar resources year round, and the possibility of limiting operations >> during cloudy weather to meet these goals. >> >> Thanks, >> >> Ray Walters >> >> Remote Solar >> >> _______________________________________________ >> List sponsored by Redwood Alliance >> >> List Address: [email protected] >> >> Change listserver email address & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> List-Archive: >> http://www.mail-archive.com/[email protected]/maillist.html >> >> List rules & etiquette: >> www.re-wrenches.org/etiquette.htm >> >> Check out or update participant bios: >> www.members.re-wrenches.org >> >> _______________________________________________ >> List sponsored by Redwood Alliance >> >> List Address: [email protected] >> >> Change listserver email address & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> List-Archive: >> http://www.mail-archive.com/[email protected]/maillist.html >> >> List rules & etiquette: >> www.re-wrenches.org/etiquette.htm >> >> Check out or update participant bios: >> www.members.re-wrenches.org >> > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: [email protected] > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/[email protected]/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > > Dave Angelini Offgrid Solar "we go where powerlines don't" http://members.sti.net/offgridsolar/ e-mail [email protected] text 209 813 0060 _______________________________________________ List sponsored by Redwood Alliance List Address: [email protected] Change listserver email address & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://www.mail-archive.com/[email protected]/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org
