[RE-wrenches] Strategies for staged startup of appliances

[Jay]

You’ve got to plan on them all starting at once anyway. You can’t expect that it’ll never happen. 

And really how do you prevent it. The refrigerators and AC’s are on all the time waiting for the thermostat to activate.  And it’s not good to turn a working fridge on/off especially is the compressor is running. 

Bigger loads, bigger inverters, bigger dollars. 

Jay



> On Sep 11, 2019, at 4:24 PM, Jason Szumlanski <jason at floridasolardesigngroup.com> wrote:
> 
> That is what I was thinking, but how will the contactor coils "know" when the ATS switches to inverter power. I'm thinking I need to use an AUX relay or a series of relays to produce the desired result. I don't think it will be necessary when going from solar to generator in this case, but maybe. I guess the question is how to activate the time delay any time the ATS switches over. That would be the easiest solution maybe.
> 
> I'm probably looking at a quad Conext XW+ system here. Even at over 100A @ 240V continuous rating I'm anticipating some startup issues with all those motors (I forgot to mention well and pressure pumps also!)
> 
> Jason
> 
> 
> 
>> On Wed, Sep 11, 2019 at 5:50 PM Michael Morningstar <mjmorningstar at gmail.com> wrote:
>> Put the loads on contractors, control the contractors with adjustable time delay relays. Stagger the timing.
>> 
>>> On Sep 11, 2019, at 2:41 PM, Jason Szumlanski <jason at floridasolardesigngroup.com> wrote:
>>> 
>>> In an off-grid situation I'm looking for a strategy to manage transfer from generator power to inverter power because I have a lot of high startup load appliances planned for a system. Think 8 mini-refrigerators, one sub-z large refrigerator, and an under-cabinet ice maker, not to mention air conditioning. I would like to start these loads in stages if they all call to start up immediately upon system startup or during ATS switch over. Any ideas?
>>> 
>>> I guess while I'm on the subject I should ask about my eye-roll, keep-me-up-a-night, giving-me-heartburn problem with this ice maker. It's going to be outdoors in Florida and they expect it to make 25-50 pounds of ice per day. I am finding it really hard to estimate energy use for this appliance. Any ideas (other than the obvious "don't do it" answer)?
>>> 
>>> 
>>> Jason Szumlanski
>>> Florida Solar Design Group
>>> 
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