# How to reduce peak consumption (hems)

**URL:** <https://discourse.nodered.org/t/how-to-reduce-peak-consumption-hems/35148>\
**Category:** General\
**Created:** [1 November 2020 08:13 UTC](https://discourse.nodered.org/t/how-to-reduce-peak-consumption-hems/35148 "2020-11-01T08:13:43Z")\
**Posts on this page:** 1\
**Showing post:** 50

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**Author:** ![dynamicdave](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/dynamicdave/32/96_2.png) [@dynamicdave](https://discourse.nodered.org/u/dynamicdave)\
**Post date:** [3 November 2020 11:12 UTC](https://discourse.nodered.org/t/how-to-reduce-peak-consumption-hems/35148/50 "2020-11-03T11:12:29Z")

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Sorry - this might be a little bit off topic...

I'm using a PZEM-004T to monitor and report voltage/current/wattage and power-factor. My sensor is located on the main consumer panel, but I don't see any problem (apart from the cost) in using a number of these sensors **[Edit] clamped around the live wire** of key appliances.

 ![Screen Shot 11-03-20 at 09.23 AM](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/c/a/ca8bf5bd836afd90be2ee02c49f945a205fa2599.jpeg)

> [@Need to write one function that will return 3 values](https://discourse.nodered.org/t/need-to-write-one-function-that-will-return-3-values/30931/10):
>
> Here's a screen-shot of my simple dashboard. I'm using a PZEM-04 module with a split-ring current transformer feeding into a Wemos D1 Mini flashed with Tasmota that transmits to Node-RED via MQTT (very similar to your system). Here's a screen-shot of the NR flow. And here's the flow-code that uses a dynamic band changer for the Power-gauge. [{"id":"47ec6f8.e8c9b9","type":"ui\_gauge","z":"f0f0fcca.cf3ac8","name":"","group":"900b126f.c721c8","order":2,"width"…

Since publishing the above posting, I've implemented a dynamic band changer for the 'current' gauge.

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