Short thread: Dan installs an energy monitor

I wanna get some solar panels eventually, and I figure Step Zero of that is gonna be figuring out in detail what kind of loads I'm powering and when, so I can then figure out some nuts-and-bolts stuff about a DIY solar system.

I got one by a company called Emporia, it was a couple hundred bucks. Which is a lot, but I kinda expect that like with the wee bluetooth OBDII reader and Torque on my phone, having a visible Shame Number telling me QUIT BURNING SO MUCH COAL DAN will, well, stop me burning so much coal

How this thing works is you get a box to stuff inside your electrical panel, and you get a bunch of little clamp-on current transformers that go on all your hot wires.

You also get a BIG pair that are supposed to go over the mains, but my panel's from 1990 and they lay it out better these days, I couldn't fit the main CT's on in any way. The company confirmed that I could omit these and the software would Math It for now.

Once you have all your current-sensing clamps installed in the panel, it's time to have a frank, open and nonjudgmental conversation with the people who share your space

Once it's settled that you can not in fact "just live like this babe" it's time to trim some wires.

You know those screw-on terminals that are useful when breadboarding electronics? Well this is like that but in a connector.

Just cut,
Strip,

and reinsert.

"The white goes to the right and everyone gets screwed" is easy to remember right now for some reason

With half the panel neat and tidy and the other half left absolutely feral, it's time to take a break for a week or two
Just kidding, the other half can have a little tidy too, as a treat
Reinstall the front of the panel, get the box connected to the wifi, get on the app, and recoil in horror as you come to understand the full extent of your house's wiring shambles.

The app is, to be fair, very good. It gives you a second-by-second graph of current draw, accurate enough that I just watched when my spouse's computer was updating and I could see how hard it was working at any given moment.

But it relies on a connection to Emporia's servers, so one day it might not be very good, but fortunately you can flash ESPHome onto these and fiddle around with Home Assistant. I didn't do that just yet, that'll be a project for another time.

Oh and apparently my fridge is on the same circuit as my furnace, woo

(I'm joking of course, I would never let my spouse see that horror, much less ask her to Just Live With It Babe)

((I wasn't joking about my furnace being on the same circuit as my fridge. See, it's already providing me with valuable anxiety))

Anyway the hardware is pretty neat. It senses and processes and updates quick enough that it can detect those big inductive kicks when a stopped motor starts or a big filter cap charges up. Thing'll draw kilowatts for a split second and then settle down to double or triple digit watts, and this sensor can notice it.

That's good, that's relevant, because when you're shopping for solar panels, physics is all "You wanna run a fridge? Eh, couple hundred bucks, NBD. Oh, you wanna START a fridge? Five grand, hand it over."

I've posted before and I still maintain that fridges should have kick-starters

Well it's been a day, what've I learned?

* I should probably run at least one 'nother circuit 'cause yikes I've got a big inductive load in the water pressurizer sharing a circuit with stuff like my projector and games consoles etc
* My main monitor, a glorious 1600x1200 from the past that's Just Right, draws like 50 watts, which is about what my computer draws, which seems like A Lot
* Growing up in the 80's and 90's we were taught all about the perils of Standby Mode, ooh ENERGY VAMPIRES, wanna know how much that same power-gobbling monitor draws when it's doing the orange light? Absolutely bloody nothing

A handy thing that this energy monitor has taught me is that the dehumidifier uses WAAAAAY more electricity than I thought it did, like whoa

It's much cheaper/less polluting to run the whole-house air conditioning for like ten minutes than to let that tiny lil dehumidifier struggle for an hour

Saw a massive spike in the graph a couple weeks ago, I used thrice my usual electricity usage and it's because I was trying to dry out the leak sensor at the bottom of my water heater, because while I was rerouting its condensate line I allowed one (1) drop of water to fall into the pan and the water heater went 😳 AAAAAH I'M LEAKING and clenched its intake valve shut, and then wouldn't shut up about it for FOUR DAYS

Maybe I'll post a thing on my secret blog about all the secret low-power ways to stay cool in the summer and toasty in the winter that don't involve much electricity

Gotta put more stuff in it to justify it not being secret anymore

Update on this btw, I had some questions during installation and they were answered promptly by a guy at the company called Jack and another guy called Jack and another guy called Jacques for amusing "No sorry, you were speaking to a different Jack" just like twenty years ago when I did call centre tech support with five other Dans.

Also the thing I bought went on sale like a week after I installed it so I sent a cheeky email to the company which I will replicate here for transparency, subject line "Being cheeky and asking for free smart plugs and also an app suggestion":

-----

Hey folks, Jack, Jacques, whoever else works there who I haven't talked to yet, on the 8th of this month I blew two hundred bucks on one of your Vue energy monitors (very nice by the way) and then eleven brief days later I get an email telling me that if I'd shown even a sniff of restraint I could've gotten the bundle deal and had the monitor and four smart plugs for the same money.

If left unchecked, the lesson I'll take from this is "Always wait to buy a thing," and as a seller of Things this might understandably give you the heebiejeebies, because who knows how long I'll wait? You can remedy this situation by sending me some smart plugs as a goodwill gesture, that I will happily post about on social media (on Mastodon, so it'll be an audience of freaks and weirdos, but at least freaks and weirdos who enjoy energy monitoring). Here's the thread so far, if you're curious and/or nosy: https://retro.social/@ifixcoinops/113478639382007122

(speaking of freaks and weirdos, I'm aware that some folks have been asking for official Home Assistant / ESPHome firmware support, so please do me a favour and yell across the office to your boss that there's another one)

By the by, the main CT clamps wouldn't fit around the cables in my 1990-era panel so I left them off. The monitor continues to work fine with the smaller coils clamped onto each circuit, and I get a readout at the top of the app's home screen for my total energy use as the sum of all the individual circuit CT's - but if I tap on that total-use readout, I don't get the daily/weekly/monthly etc graphs I would expect. An option within the app to graph out the sum of all circuit CT's would be really handy for folk like me who don't have room for the Big Clamps.

Thanks!

~Dan

-----

In response to this email they sent me four smart plugs AND the expensive flexible rubbercoated mains loops for free. I told them in November 2024 that I'd post about them on this thread and then I never did because I'm lazy.

Companies: give me free stuff so I can post about it over a year later

Dan Fixes Coin-Ops (@[email protected])

Short thread: Dan installs an energy monitor I wanna get some solar panels eventually, and I figure Step Zero of that is gonna be figuring out in detail what kind of loads I'm powering and when, so I can then figure out some nuts-and-bolts stuff about a DIY solar system. I got one by a company called Emporia, it was a couple hundred bucks. Which is a lot, but I kinda expect that like with the wee bluetooth OBDII reader and Torque on my phone, having a visible Shame Number telling me QUIT BURNING SO MUCH COAL DAN will, well, stop me burning so much coal

Retro Social

@ifixcoinops to start with, I’d like to know the (easy) ways to do an audit.

From a smart home perspective, we’re pretty above average (but not advanced), but focused on HomeKit (with homebridge)

What energy meters do you recommend. What steps and process to use to audit the home (both once and ongoing)

@jasonkarns single biggest one bang-for-the-buck-wise was a $15 infrared thermometer and $10 of caulk

Second-biggest was some rolls of insulation batts, several podcasts and a new staplegun

@ifixcoinops do you use any electric monitors? What did you use to discover the humidifier was a hog?
@ifixcoinops I would definitely read this. I went through four tubes of caulk last fall and I think I made my money back.
@ifixcoinops I would like to read that blog post

@ifixcoinops

The asshole part of my mind wishes I knew enough to package it in a useful "WW2 sabotage manual" style of way and get it to people being fucked over by their landlords in areas with absolutely skyrocketing rent.

@ifixcoinops unsolicited edge case I've undoubtedly posted about before:

we have a weird problem in our house

we're on the first floor, so all the coldness from the upstairs central air floats down to us

we end up cool and humid for free

can't really run the central air without making it colder

so that's why the dehumidifier

you're damn right tho, and you should say it

that temperature/humidity phase diagram is a FORCE

pretty sure we should have more ERV — energy recovery ventilation — which is hard to optimize for all seasons

@rey @ifixcoinops

@ifixcoinops what energy monitor are you running?

(asking you specifically because iirc you have the same aversion to Just Putting Everything In The Cloud that I do, and have been using this thing for long enough to not get mad and rip it out)
@emily an Emporia Vue, it's cloudy but not a dick about it, at some point I'll esphome it but it's innocuous enough that I'm not in a hurry to do so
@ifixcoinops wow, I run a three-node proxmox cluster (admittedly very low power n100 nodes, but running like 20 containers - including this mastodon server) on less power than your monitor draws.
@iMeddles to be fair to it, it's a really good monitor

@ifixcoinops The standby mode panic was always a bit inflated, but I also think the situation was worse in the 80’s and 90’s. Early set top cable boxes went to sleep at something like 80% of peak power draw.

Ironically, those didn’t have “off lights”, so people didn’t complain nearly as much about them.