跟讀練習: The Hidden Problem With Home Batteries - 通過影片學習英語口語

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This is my electric bill from January.

I have solar on the roof and 20 kWh of battery bolted to my garage wall.

Even with all of that, the Eversource bill came out to $336.

And Banked Sunshine from last summer paid $166 of it.

Then the credit bank hit zero and my next bill came entirely out of my pocket.

So here's the part that took me two years and a spreadsheet to work out.

Every dollar of that rescue came from the panels on my roof, and the battery didn't help.

12 months of my own utility bills

and ran them against 12 months of data from the panel that meters every single circuit in my house.

Then I ran those same 12 months again with the battery deleted.

My battery costs me about $270 a year in electricity and has never saved me a dollar.

Not once.

And I'd buy it all again tomorrow.

I know exactly how that sounds, but stick with me here, because by the end of this you'll know why

and then you'll be able to decide whether my reasons align with your reasons.

There's also something I realized I got wrong about my electric bill that I stated in a previous video two years ago.

So what did I learn about home batteries after living with them across two homes over six years?

And are they worth it?

I'm Matt Farrell.

Welcome to Undecided.

This video is brought to you by Surfshark.

A quick bit of history because it matters more than it looks like it does.

In my old house, I had one Tesla Powerwall.

Tesla's referral program gave me the hardware for free, but I paid for the installation costs.

previous video.

That meant I had to estimate the total overall costs whenever

I talked about the calculation of payback numbers for my previous house.

It was also a ballpark estimate because of the referral program.

But this time I paid for the whole thing.

Four Enphase IQ5P batteries, which means 20 kWh of storage and 15.4 kW of output. $33,407 all in before any rebates.

The federal tax credit took 30% off and Massachusetts kicked in $1,000, so the net cost was $22,385.

That's $1,119 for every single kilowatt hour hanging on that wall.

I financed it with a MassSave 0% heat loan.

It's a great program that Massachusetts runs to offer low

or no interest loans for home energy upgrades on things like HVAC heat pumps to home batteries.

Again, nobody sent me these batteries, so there's no sponsor.

That's my money on the wall.

And here's what I thought I was buying.

Keeping those electrons generated on my roof, in my house, to help keep my electric bill low.

Also the ability to shrug at a power outage.

There's more to that, but only one of those turned out to be real.

Before we get into the money, return on investment, and all the other reasons you might want to get a home battery, here's what this thing does on an ordinary Tuesday.

Taking the last 18 months of data off my Span Smart Electric panel gives some really interesting insights.

On a median day, the battery discharges 11.3 kWh.

Over the last complete year, it moved 3,673 kWh into the house.

And here's the key thing to keep in mind.

The season decides everything.

In January, my solar panels generate about 20 kWh a day, while my house eats 52.

And yes, that's a lot, but remember that my house is all electric with an EV, heat pumps for heating and hot water.

Like everything.

There's no excess electricity generation to store, so the battery only moves about 6 kilowatt hours or so a day.

However, in July I make 61 kilowatt hours a day and use 58, which results in the battery moving about 14 kilowatt hours.

One quick clarification on my setup is that I keep my battery system set to 20% battery reserve, which means my total usable capacity isn't 20 kilowatt hours, it's more like 16.

Now let's do some division, because who doesn't like some math?

3,673 kilowatt hours a year over 16 usable kilowatt hours is 230 full battery cycles a year.

My warranty covers 6,000 cycles or 15 years, but at my rate, I won't hit 6,000 cycles until year 26.

It's kind of like a car warranty.

Your car may come with a 150,000 mile warranty, but if you only drive 4,000 miles a year, the warranty will expire by its time limit first.

I'm like that little old lady who only drives to church and back once a week.

So this battery is going to age out long before it wears out.

I wish I could say the same thing about my knees.

That sounds like good news, right?

It's actually the whole monetary problem because every dollar I spent has to spread across a very small pile of kilowatt hours.

And that pile is smaller than I told you it was.

Two years ago I sat here and explained how my electric bill works and I got part of it wrong.

I didn't find out until I pulled the last 12 months of statements for researching this video.

But hang tight because I'll show you the exact line item that proves it.

But the reason I got it wrong was that something changed quietly and nobody told me.

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OK, let's pull up my bill.

Let's go slowly here.

More for me than for you.

My meter keeps a tab.

One counter for kWh coming in from the grid and one for kWh going out.

Eversource subtracts one from the other once a month and everything on my bill is computed on the difference.

The bill makes it pretty clear.

Consumption of 1,181 kWh, minus 143 for generation, nets 1,038.

Then watch what happens to that 1,038 kWh.

Both the supply and delivery chargers are computed on 1,038.

The kWh I exported canceled the kWh I imported, delivery charge included.

In Massachusetts that means about $0.32 of value for each one.

That's a real one for one trade.

And it's always worked that way here.

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So what does the battery have to do with any of that?

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Take July of last year, a month where I sent out far more than I took in.

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With the battery I imported 853 kWh and exported 1,420.

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Without it, I'd have imported 1,361kWh and exported 1,999kWh.

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The battery cut both sides by roughly the same amount.

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So my net barely budged and I came out $18 worse off.

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Now let's look at the month where I owed money.

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December of 2024.

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With the battery I paid $231.07, which is exactly what Eversource billed me.

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Without it, it would have cost $192.62, which means the battery cost me $38.

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This type of thing is happening every single month.

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Across the last 12 months, the battery cost me $207.

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The reason is almost embarrassingly simple.

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With every kWh I run through the battery, I lose about 16% as heat.

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714 kWh a year, gone.

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The cars in my garage might be slightly cozier because of that, but my wallet is not.

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Under a flat electricity rate like mine, along with basically 1 to 1 net metering, the grid is a better battery than my battery.

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It's virtually 100% efficient.

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But two years ago, I told you Massachusetts credits your exports at the generation rate only.

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So you eat the delivery charge on everything you send back.

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And I said the battery helps you dodge that.

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Many states in the country operate that way, so in those locations, that's 100% true.

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But my specific case, only half of what I said was true.

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In early 2024, my credit really was about 54% of retail, which certainly looks generation only.

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In February of 2025 it jumped to 85% and today it matches supply plus distribution plus transmission almost to the penny.

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My export terms improved by more than half and nobody told me.

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Not sure why.

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I only found it because I keep a spreadsheet.

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In case you couldn't tell, kind of a nerd.

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But the conclusion I drew was wrong back then.

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There is a haircut happening on the net metering credit for me.

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It's about 4.8 cents and it only touches the surplus

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that spills into the credit amount that builds up over the summer months.

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My battery couldn't capture it either way.

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And here's the number that nobody who's selling you a battery will put on a slide.

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So let's put a price tag on a stored kWh.

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Start with the net cost of $22,385.

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Spread it out over everything the battery will deliver in 20 years at my usage level, which is about 64,000 kWh.

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That number assumes the battery loses about 1.5% of capacity every single year, which is what the published data on this battery chemistry actually shows.

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That's $0.35 a kWh just for the hardware.

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This is not accounting for my solar panel setup, just the battery by itself.

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But when we do account for the solar I'm generating, we have to account for the cost of charging the battery.

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Every excess kWh I put into the battery is one I could have sold back to the grid for $0.28.

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Because I lose 16% in round trip efficiency, that works out to another $0.33 for every kilowatt hour I get back out. $0.68.

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That's what one kilowatt hour of my battery costs me.

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The one it replaces is worth $0.28 and I can buy one off the grid for $0.32.

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I'm paying more than double the grid price to store electricity I already own, and longer battery life doesn't rescue it.

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Stretch it to 25 years and it only falls to $0.62, because the cost of filling it never changes.

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And before you jump into the comments and try to dunk on home batteries in general, or especially on my setup, there is money in this system and it comes from exactly one place.

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My utility rents my battery.

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It's called Connected Solutions.

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Every summer between June and September, there's 40 or so afternoons that Eversource sends a signal to my battery to dump its power back into the grid.

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The sessions last for about 2-3 hours right around the 5pm crunch.

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Enphase pays $275 per average kilowatt delivered and passes 100% of that money from my utility to me.

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Some companies don't because they take a cut.

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But how's it work out?

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In 2024 I earned $1,881.38.

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In 2025 I earned $1,634.35.

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So why was one year 13% less?

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Both years my battery dumped essentially the same energy per event, about 14.5 kWh.

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What changed is how long the utility stretched it out.

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The program pays on average kW, not kWh.

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Basically, you get paid for how fast you can empty your bucket instead of how much water is in it.

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Same energy over 2 hours scores 7.3 kW.

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Over 3 hours, 4.8 kW.

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In 2024, 82% of my events were 2 hours.

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In 2025, only 55%.

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Same battery, same job, but a third less money.

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And I have zero say in it.

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Which brings us to the real question, does a home battery make financial sense?

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If you take the $207 a year my battery costs to run out of the Connected Solutions income, I'm netting about $1,550 a year if I average the first two two years.

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My enrollment runs for five years, but my understanding is that I might be able to re-enroll.

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If participation does end after five years, this battery will only recover about 20% of its cost over 25 years, and then it bleeds $200 a year forever.

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If it renews beyond the five-year period, it might pay for itself in year 15.

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The whole answer is kind of fuzzy on what's going to happen down the road.

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So when looking at the finances and ROI of a home battery, the math is saying no, it's not worth it.

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So here's the question I've been dodging for the past 10 minutes.

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Why don't I regret this?

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Why on earth would I do it all over again?

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That's because this isn't an investment decision.

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I'm not deciding what stocks to buy or where to invest my money for a financial return.

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Ask yourself, what does a battery do?

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What's its function and purpose for what you want it for?

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Do you buy a lawnmower because it's an investment or because it serves a task?

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For instance, look at my emergency backup history.

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For the past 26 months, I've had 10 outages for a total of 51 minutes.

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Out of those, the longest one lasted 11 minutes.

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On his face, it sounds like I'm spending over $22,000 for 51 minutes of backup is an insane decision.

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But here's what actually happened during those 10 outages.

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Nothing.

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We didn't notice.

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There were times we were running on backup and had no clue.

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No flicker, no beeping, no clocks blinking at us the next morning.

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I found out afterward from a log or phone notification that I missed.

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And that's the thing the spreadsheet can't see.

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Every number in this video is a money calculation, and money is not why most people buy a battery.

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So let's talk about my actual reasons for wanting a home battery.

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Contradictions included because I think the contradictions are the interesting part.

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I wanted energy independence.

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Meanwhile my utility takes the wheel 40 or so afternoons during the summer, and that's the only part of this that pays.

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My money and motivation are pointing in opposite directions.

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I wanted to use my own clean solar power power being generated on my roof.

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And To do it, I throw away 714 kWh a year as heat.

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Storing my own sunshine is less efficient than shipping it to the grid and buying it back.

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But I wanted resilience.

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I didn't size it for the worst case scenario.

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20 kWh runs my whole house about 8 hours in January, if I didn't do any kind of curtailment.

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A genuine multi-day nor'easter needs 3 or 4 times that.

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I made a rational call about how much backup I'd most likely need.

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Going off-grid was never my motivation.

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If I shut things down to just the critical loads like the fridge, the HVAC, a few lights, and with any January sun at all, I can run it indefinitely.

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That's the span panel helping me to shape my energy usage during an outage.

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Most people just install a hard-wired critical loads panel to do the same thing, but I'm able to adjust my critical loads in software.

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I can be more flexible with it depending on what's actually happening.

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The last rationale for getting a home battery tends to trip up everybody.

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Independence and resilience are two different things.

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Independence means leaving the grid.

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Resilience means the grid can stay.

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It just stops mattering when it fails.

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And I want the second one.

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Those two get mashed together constantly and they buy you completely different systems.

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EnergySage asked homeowners and installers the same question in the same survey.

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67% of installers said people buy batteries for resilience, only 11% for savings. To homeowners?

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30% said rate savings.

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A lot of people are being sold one story while telling themselves another and nobody's numbers get checked.

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And there's one benefit that the whole spreadsheet misses.

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When my battery discharges at 5pm on a 90 degree Fahrenheit day, it's shoving aside the dirtiest power on the grid.

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Peaker plants are what's running at that hour.

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Last year my battery pushed 611 kWh into the grid across 43 events.

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Every one of them timed to the filthiest moment of the day.

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My solar can't do that on its own.

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So here's where I land.

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I can't tell you this pays for itself, because in my situation, it doesn't.

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What I can tell you is what $22,000 actually bought for a nerdy homeowner in Massachusetts.

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It bought 10 power outages that I slept or worked through.

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It bought about $1,550 a year for as long as Eversource keeps renting it.

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It bought a house that holds its fridge

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and HVAC through a storm as long as the sun shows up from now and then.

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And it bought me the ability to stop thinking about winter nor'easters, which… knock on wood, hasn't impacted me in this house yet.

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It definitely did in my previous house.

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I've experienced much longer outages and it's not fun.

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Which is why I'd much rather be prepared with my energy storage backup.

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It costs me $207 a year in electricity and it will very likely never pay itself back.

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But it depends on where you live and how your electricity rates are structured.

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And this was my favorite part of digging into this topic.

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While I was pulling bills for this video, I found this.

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Eversource swapped my meter in February.

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Western Massachusetts is first in line for their smart meter rollout.

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A million and a half of them will be installed by the end of 2027.

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And the entire point of that program is time of use rates.

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Now, time of use would flip my energy math from negative $200 a year to somewhere between $170 and $800 positive,

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depending on how Massachusetts structures the rates.

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It definitely helps, but it still doesn't make it a crystal clear investment.

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The program renting my battery still does that.

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But here's the part I'm fixated on.

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A better peak rate wouldn't help my battery.

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But my utility paying me less for excess solar power I send back would.

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Right now, the grid is a perfect virtual battery for anyone that lives in my area with solar.

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It's free and never loses a thing.

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That's exactly why my battery can't win.

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The policy change I'd normally be complaining about is the one

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that would actually vindicate the purchase and honestly be more fair to all the non-solar homeowners and renters in my area.

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And yes, I'm advocating for not having a 1 to 1 net metering.

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I think it's more fair to have generation only credits for solar homeowners.

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Come at me in the comments if you disagree.

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And if you've got a battery of your own, I'd genuinely like to see your numbers and hear about your motivations on getting one.

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And for those of you that don't have home batteries, do you want them?

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Do they make sense in your area?

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Jump in the comments and let me know.

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You can also check Check out extended cuts of many of my videos over on Patreon.

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If human-written and researched videos matter to you, Patreon support helps a ton.

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The link's in the description if you'd like to join, but just watching, subscribing, and turning on notifications is awesome.

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Check out my follow-up podcast, Still to be Determined, where we'll keep this conversation going.

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Keep your mind open, stay curious, and I'll see you in the next one.

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本課的詞彙與口語要點

這節 B2 級別的口語課以影片“The Hidden Problem With Home Batteries”為素材。影片中反覆出現的詞有：battery, kwh, hour, grid, cost。這段影片共有 273 個句子、3307 個單詞可供跟讀。講話部分時長為 17:54。說話人語速較快，每分鐘約 185 個詞，會出現較多連讀和弱讀。只有 81% 的單詞屬於英語最常用的 3,000 詞，詞彙難度較高。

影片中的重點詞彙

影片中最難的 15 個單詞，附發音和釋義：

單詞	發音	釋義
grid 名詞	/ɡɹɪd/	網格 /網格, 格子
kilowatt 名詞	/ˈkɪ.ləˌwɒt/	千瓦
homeowner 名詞		屋主
spreadsheet 名詞	/ˈspɹɛd.ʃit/	試算表 /試算表, 電子表格 /電子表格
resilience 名詞	/ɹɪˈzɪl.ɪ.əns/	彈性, 韌性
meter 名詞	/ˈmitəɹ/	計量表 /計量表
metre 名詞	/ˈmiːtəɹ/	米, 公尺
import 名詞	/ˈɪm.pɔɹt/	進口貨 /進口貨, 舶來品 /舶來品
mathematics 名詞	/mæθ(.ə)ˈmæt.ɪks/	數學 /數學, 算學 /算學
compute 動詞	/kəmˈpjuːt/	計算 /計算
contradiction 名詞	/ˌkɑːntɹəˈdɪkʃən/	反對, 反駁
usable 形容詞	/ˈjuː.zə.bəl/	可用
referral 名詞	/ɹɪˈfɜː.ɹəl/	轉介, 轉診
calculation 名詞	/ˌkælkjuˈleɪʃn̩/	計算 /計算
notification 名詞	/ˌnoʊtɪfɪˈkeɪʃn̩/	通知

影片中出現的短語動詞

單詞	發音	釋義
check out 動詞		退房
find out 動詞		找出, 查明
work out 動詞	/ˌwɝk ˈaʊt/	計算 /計算, 算出
come out 動詞	/ˌkʌm ˈaʊt/	出, 出來 /出來
follow up 動詞		跟進 /跟進
go out 動詞		出, 出口
take off 動詞		脫 /脫
throw away 動詞		棄置 /棄置, 扔

值得反覆跟讀的句子

影片中簡短而完整的句子，可以直接用在日常對話裡：

That's my money on the wall.
In case you couldn't tell, kind of a nerd.
Why don't I regret this?
What's its function and purpose for what you want it for?
Do they make sense in your area?

影片中的語法

說話人最常用的結構，並附上影片中的原話：

結構	影片中的用法
現在完成進行時 have/has been + -ing — 以前開始、現在仍在繼續的動作	I've been using · I've been dodging
被動語態 be + 過去分詞 — 強調發生了什麼，而不是誰做的	is brought · is computed · are computed
現在完成時 have/has + 過去分詞 — 過去發生但與現在仍有關聯的事	has never saved · I've had · hasn't impacted
定語從句 who / which + 從句 — 補充說明人或事物	batteries, which means · reserve, which means · level, which is

需要注意的發音

說話人用了 52 次縮略和弱讀形式，例如 I'm, I'd, can't。請按聽到的簡短形式來說。

“sh” 和 “zh” 音: spreadsheet /ˈspɹɛd.ʃit/, contradiction /ˌkɑːntɹəˈdɪkʃən/, calculation /ˌkælkjuˈleɪʃn̩/, notification /ˌnoʊtɪfɪˈkeɪʃn̩/, sunshine /ˈsʌnʃaɪn/
長單詞——注意重音位置: resilience /ɹɪˈzɪl.ɪ.əns/, undecided /ˌʌndɪˈsaɪ̯.dɪd/, mathematics /mæθ(.ə)ˈmæt.ɪks/, contradiction /ˌkɑːntɹəˈdɪkʃən/, notification /ˌnoʊtɪfɪˈkeɪʃn̩/

中文母語者容易讀錯的音：

詞尾子音 — 要讀清楚，後面不要加母音: grid /ɡɹɪd/, kilowatt /ˈkɪ.ləˌwɒt/, outage /ˈaʊ.tɪd͡ʒ/, spreadsheet /ˈspɹɛd.ʃit/, resilience /ɹɪˈzɪl.ɪ.əns/
/r/ 和 /l/ 的區別: resilience /ɹɪˈzɪl.ɪ.əns/, referral /ɹɪˈfɜː.ɹəl/, rationale /ˌɹæʃ.əˈnæl/, clarification /ˌklæɹɪfɪˈkeɪʃən/, enrollment /ənˈɹəʊl.mənt/
/æ/ — 嘴張大，不要讀成 /e/: mathematics /mæθ(.ə)ˈmæt.ɪks/, calculation /ˌkælkjuˈleɪʃn̩/, rationale /ˌɹæʃ.əˈnæl/, clarification /ˌklæɹɪfɪˈkeɪʃən/, scam /ˈskæm/

如何用這段影片練習

先完整聽一遍影片，不要開口，記下不認識的單詞。
先用 0.75 倍速逐句跟讀，熟練之後再回到正常速度。
錄下自己的聲音並與原聲對比，特別注意 grid, kilowatt, homeowner 這類單詞。

什麼是跟讀法？

跟讀法 (Shadowing) 是一種有科學依據的語言學習技巧，最初開發用於專業口譯員的培訓，並由多語言者Alexander Arguelles博士普及。這個方法簡單而強大：您在聽英語母語原聲的同時立即大聲重複——就像是一個延遲1-2秒緊跟說話者的影子。與被動聽力或語法練習不同，跟讀法強迫您的大腦和口腔肌肉同時處理並模模擬實的講話模式。研究表明它能顯著提高發音準確性，語調，節奏，連讀，聽力理解和口語流利度——使其成為雅思口語備考和真實英語交流最有效的方法之一。

影子跟讀法: 閱讀完整分步指南 →

跟讀練習: The Hidden Problem With Home Batteries - 通過影片學習英語口語

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