Hi Mac, There are a few questions like is it Al or Cu wire, What makes it unusable? for Voltage drop, I use Vd=2KIL/CMA for your case the unknown is the current. The installation of an inverter with grid support. Many inverters have this, you want a multimode inverter such as a Schneider, Outback, SolArk and I could name at least 4 more. A normal house will run on 30 amps. So assume 30 amps, Vd=2x21.6x30x1100/211600 =6.7 volts So if the main house is at 240 Volts the remote house is at 233 Volts. The multimode inverter could be set at grid support beyond 30 Amps. For higher house loads the inverter can support up to 30 to 50 amps additional. (SolArk is 50 amp) I would add a balancing transformer at the end of the line to make the 120 loads balance. (an Autotransformer) such that 120 volts loads are balanced and the load is shared between 240-Volt conductors. Based on my customers' experiences I would use AGM LA batteries, as I expect low usage of the battery and quick recharge, but that is the customer's choice. I had one customer that had 10 years on the float-AGM battery set.
On Fri, Apr 17, 2020 at 8:15 AM Mac Lewis <[email protected]> wrote: > Hi wrenches, > > I've got a architect client with a sub-optimal power situation on one of > the projects he is working on. I'm running through a couple of scenarios > that may work. Its a ADU (accessory dwelling unit) that is about 1100' > from power. The farmer had taken it upon himself to bury some 4/0 a few > years ago to run power out there. Voltage drop is the big issue and its > not going to pass the AHJ inspection. We could just ditch the grid and go > off-grid, but it seems like a shame to not tap into the grid resource. > Instead of dealing with the voltage drop, I was thinking it may make sense > to rectify that low AC voltage input and parallel a smallish battery bank > (size is yet to be determined), then use an off-grid inverter to serve the > loads at good voltage. > > I am looking for feedback on this concept. What do you think? > > Also, are there any recommendations for good quality rectifiers with wide > input voltage window? > > Thanks in advance for your help > > -- > > > > Mac Lewis > > *"Yo solo sé que no sé nada." -Sócrates* > _______________________________________________ > 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 > >
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