<div dir="ltr"><a href="https://shop.yosmart.com/products/ys7106?variant=42759198474491&country=US¤cy=USD&utm_medium=product_sync&utm_source=google&utm_content=sag_organic&utm_campaign=sag_organic&gad_source=1&gclid=CjwKCAiAt4C-BhBcEiwA8Kp0CZ4PovkNPisfISXMrIVukd795AgmTr7mS5ks6rw1vqD6LP-Ni2vO1BoC9PcQAvD_BwE">This is a smart IoT device</a> 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! <a href="https://shop.yosmart.com/"> https://shop.yosmart.com/</a><div><br></div><div>Eric </div><div><br></div><div><br></div></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Thu, Feb 27, 2025 at 11:10 AM Richard Scott via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org">re-wrenches@lists.re-wrenches.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div>How about a relay powered by the AC grid with SPDT contact configuration. </div><div>Use normally closed contacts to close a circuit turning on a lamp or other device powered off the backup AC power.</div><div>When the AC grid goes down, the relay de-energizes and closes the normally closed contacts thereby turning on the indicator device.</div><div><br></div><div>Richard</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Feb 27, 2025 at 9:18 AM Nicholas Ponzio via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">re-wrenches@lists.re-wrenches.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div dir="ltr"><div>Dear Esteemed Wrenches,</div><div><br></div><div>This issue arises periodically, and I'm hopeful someone in the group has devised a cost-effective, low-power solution.</div><div><br></div><div>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. </div><div><br></div><div>Thank you in advance for your insights.</div><div><br></div><div>Sincerely,</div><div>Nicholas Ponzio </div><div>Building Energy<br><br></div></div><img width="0" height="0" alt="" style="display: flex;" src="https://mailtrack.io/trace/mail/04c67dec7316e93ed444eeb925742dbf63d1c29e.png?u=6273276"></div>
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