I know Schneider would love to sell you their cluster of 15 XW6848+ for a max of 102KW and probably well over 300KW of surge. Here is a link to their commercial offgrid. I do own their stock and other companies also :) Their commercial engineers are pretty smart about this.
https://solar.schneider-electric.com/solution/commercial-off-grid-solar-2/ This does sound like a challenge and keep us informed on what you do please! Good Luck! --Dave > 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:re-wrenches-boun...@lists.re-wrenches.org] On > Behalf Of Ray > Sent: April-25-18 12:37 PM > To: RE-wrenches <re-wrenches@lists.re-wrenches.org> > 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: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/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: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/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 offgridso...@sti.net text 209 813 0060 _______________________________________________ List sponsored by Redwood Alliance 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 List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out or update participant bios: www.members.re-wrenches.org
