Warning light

[schwankl]

@Philip here is a DYI version -

...looks to be <$30 in parts

 

[Philip]

Cool! So, basically, the guy made a housing for this thingie:

https://www.ebay.com/p/AC-100a-Power-Meters-Monitor-Volt-Amp-kWh-Watt-Digital-Combo-Meter-Ac110v-230v/1775376674

 

[schwankl]

that ebay seller ships from china - would probably take a few weeks. amazon has it for $13: https://www.amazon.com/dp/B079JNY5VD/?tag=sce0f-20
ebay us-sellers do have better prices on:
- box 2-Gang Gray Metal Interior New Work Standard Square Ceiling/Wall Electrical Box | eBay
- cover Electrical Box Cover,Square,GFCI,2Gang RACO 809C 50169999844 | eBay
- 10/3 4-wire cable 10/3 UF (25') (Underground Feeder / Direct Burial), Copper, 4 Wire/Cable | eBay
- receptacle and plug Plug Connector NEMA L14-30R L14-30P 30A 125/250V for Generator Cord Assembly 584 609792552652 | eBay