[RE-wrenches] Backup Mode Indicator for Whole Home Battery?

[Eric Youngren]

This is a smart IoT device
<https://shop.yosmart.com/products/ys7106?variant=42759198474491&country=US&currency=USD&utm_medium=product_sync&utm_source=google&utm_content=sag_organic&utm_campaign=sag_organic&gad_source=1&gclid=CjwKCAiAt4C-BhBcEiwA8Kp0CZ4PovkNPisfISXMrIVukd795AgmTr7mS5ks6rw1vqD6LP-Ni2vO1BoC9PcQAvD_BwE>
that you can plug into a utility grid-only outlet and it will alert you
(through the separately purchased hub) in a variety of ways when the power
goes out.  You could even program it to turn on a light or an alarm buzzer
using a smart relay and program the logic on the phone app.      Once you
have the hub and phone app installed there are a ton of other "smart"
sensors and devices that work with the system.    My off-grid home has
gotten a lot smarter in the past couple of years!
 https://shop.yosmart.com/ <https://shop.yosmart.com/>

Eric



On Thu, Feb 27, 2025 at 11:10 AM Richard Scott via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> How about a relay powered by the AC grid with SPDT contact configuration.
> Use normally closed contacts to close a circuit turning on a lamp or other
> device powered off the backup AC power.
> When the AC grid goes down, the relay de-energizes and closes the normally
> closed contacts thereby turning on the indicator device.
>
> Richard
>
> On Thu, Feb 27, 2025 at 9:18 AM Nicholas Ponzio via RE-wrenches <
> re-wrenches at lists.re-wrenches.org> wrote:
>
>> Dear Esteemed Wrenches,
>>
>> This issue arises periodically, and I'm hopeful someone in the group has
>> devised a cost-effective, low-power solution.
>>
>> For a whole-home backup system, how can we best alert homeowners that
>> they are operating on battery power? These homeowners do not use
>> smartphones and won't receive push notifications. Is there a simple
>> solution to activate a single light or audible alarm exclusively when the
>> grid is down? This particular instance involves a FranklinWH system, but
>> the same challenge applies to any battery with a whole-home backup and
>> "instant-on" transfer switch.
>>
>> Thank you in advance for your insights.
>>
>> Sincerely,
>> Nicholas Ponzio
>> Building Energy
>>
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