Eric: Any reason not putting these loads on a gen-fed panel?
William > On May 23, 2018, at 12:28 PM, Eric Youngren <[email protected]> wrote: > > Howdy Wrenches, > > I'm working on a generator powered mini-grid for an island fishing resort in > Alaska. They have 3 XW6048 inverter/chargers to charge batteries while the > diesel runs and power the loads from the batteries when the diesel shuts > down. > > They have several high power heating loads not typically seen in > battery-based off-grid electrical systems. Two 4kW hot tub heaters and six > 1kW infrared space heaters. We have the 46 kW generator run-times set so > that the infrared heaters are (in theory) powered only while the generator is > running, but the hot tubs are thermostatically controlled and cycle on and > off every 4-5 hours or so. > > I want to make it so that these big heating loads can never be powered from > the batteries, and will only come on while the generator is running. The > current plan is to use the Auxillary output 12V terminals from one of the XWs > to control power relays to switch the hot tub circuits, based on battery > voltage triggers. One of those hot tub circuits is fed from the main panel > right next to the inverters so that is easy enough. But the other hot tub is > fed from a sub-panel located in a different building around 200 feet away > from the inverters. Pulling a pair of wires to control the second relay at > that sub-panel is not practical. So, I'm looking for wireless options that > could control a power relay for the hot tub circuit in the remote sub-panel. > Ideally, the control signal would come from the same AUX terminal so both hot > tubs will not receive power when the battery voltage is below 50 volts or so, > which would indicate that the generator is not running. > > I would also like to put the infrared heaters on a similar control system so > that we are not dependent on people remembering to switch off the heaters > before the generator shuts down. > > Has any of you done this kind of thing? Any suggestions on equipment or best > practices? THANKS! > > Eric Youngren > _______________________________________________ > 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
