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<div id="signature">There is already a single LED in most utility meters that tells you the grid is on. I have marked it with a sharpie for a client.</div>
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<div>I suppose you want something for clipping on to the Grid input that can give an alarm in the house.</div>
<div>Amazon had something that I used once. Will try and look it up.</div>
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<pre><strong><span style="font-size: small;">Dave Angelini Offgrid Solar
"we go where powerlines don't"
<a href="http://members.sti.net/offgridsolar/" rel="noopener"> </a><a style="color: blue; font-size: 11px; font-family: 'Lucida Grande', Verdana, Arial, Helvetica, sans-serif; font-weight: 400; background-color: #ffffff;" href="https://offgridsolar1.com/" rel="noopener noreferrer"><span style="font-size: 12pt;">https://offgridsolar1.com/</span></a><a href="http://members.sti.net/offgridsolar/" rel="noopener"> </a>
e-mail <a href="mailto:offgridsolar@sti.net">offgridsolar@sti.net</a>
text 209 813 0060</span></strong></pre>
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<p id="reply-intro">On 2025-02-27 9:16 am, Nicholas Ponzio via RE-wrenches wrote:</p>
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<div>Dear Esteemed Wrenches,</div>
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<div>This issue arises periodically, and I'm hopeful someone in the group has devised a cost-effective, low-power solution.</div>
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<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>
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<div>Thank you in advance for your insights.</div>
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<div>Sincerely,</div>
<div>Nicholas Ponzio</div>
<div>Building Energy<br /><br /></div>
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