[RE-wrenches] wireless relays for load shedding?

[Dave Angelini Offgrid Solar]

You would be separating the heater load from the hot tub jets right? If
you do not then the jets will not run unless the power is on?
Seems like a problem if someone wants to use the tub when the gen set is
off.  --Dave


> Wireless - I have no clue but - Simplest thing that comes to mind is
> spring wound timers on the infrared lamps & clock timers.
>
> Spring wound timers come in lots of “length of time options”
>
> Could the hot tubs have a “Use schedule” to coincide with the clock
> settings?
>
>
>
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> Dana Orzel                              Great Solar Works, Inc.
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> From: RE-wrenches <re-wrenches-bounces at lists.re-wrenches.org> On Behalf Of
> Eric Youngren
> Sent: Wednesday, May 23, 2018 1:28 PM
> To: RE-wrenches <RE-wrenches at lists.re-wrenches.org>
> Subject: [RE-wrenches] wireless relays for load shedding?
>
>
>
> 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
>
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Dave Angelini Offgrid Solar
"we go where powerlines don't"
http://members.sti.net/offgridsolar/
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text 209 813 0060