Switch to plug-in solar? My advice after testing DIY energy technology at home

Follow ZDNET: Add us as a favorite source On Google.

ZDNET Highlights

• Plug-in solar uses microinverters to deliver electricity to a home system.
• So far, in the US, only Utah has passed legislation to allow such systems.
• These systems cost approximately $2,400 and will take years to pay off.

I’ve been fascinated by them ever since I owned my first small solar panel a few decades ago. The fact that a piece of glass had the ability to receive electricity from a massive nuclear sphere 93 million miles away boggled my mind at the time, and it still boggles my mind now. Since then, solar panels Size and efficiency have increased and costs have dropped to the point where it has become economically viable for you and me to buy panels and generate our own electricity.

But what do you do with that power?

Also: I’ve tested dozens of power stations — here’s how I’m preparing for summer blackouts

Till now, you had two options. You can have a standard rooftop solar system professionally wired to your home’s electrical system, or you can hook your panels up to a portable power stationAnd use it to power appliances in your home. The downside of the first option is cost, because installing solar panels on your roof and connecting them to your electrical system is a professional job. The downside of the second option is the limitation of all power flow through a power station.

But what if you could connect your solar panels directly to your home AC system, and do it yourself?

That’s what plug-in solar – also called balcony solar or portable solar – promises.

What Plug-in Solar Isn’t, and What It Really Is

Let me dispel the biggest myth right away – plug-in solar is not an AC plug connected to your solar panels. Household electricity is AC, while solar panels produce DC (direct current), so the two are not compatible. If you tried to plug the panels directly into a wall socket, a lot of things would go wrong.

Plug-in solar is a new technology that allows solar panels to be connected to a home’s electrical system. The idea is that the solar panels collect electricity during the day, feed it into the home system, and that electricity is used to cover the home’s base load for the day, and maybe a little more (more on base load in a moment).

What sits between the solar panels and your outlet is a microinverter. This is a box that converts DC power from solar panels into AC that your home appliances understand. It can then feed this AC power into your home’s electrical system through a standard plug and outlet (so your outlet becomes an inlet). Along with converting DC power to AC, the microinverter not only has to inject that power into your home’s electrical system, but it has to do it safely.

Also: I spent two years testing wind power at home – which is why solar is still my favorite source

It’s that simple. You do not need to take help from a professional as you can do it yourself. This also opens the door to solar power for people living in rental properties or apartments. For example, in Utah, landlords cannot object to tenants installing a plug-in solar system that plugs into an outlet and does not require any permanent modifications to the property.

What is base load?

Base load is the background load that a home draws during the day when no major appliances are actively in use. This represents the constant drawing of energy from essential and standby appliances such as Internet and Wi-Fi routers, chargers, refrigerators and freezers. As a ballpark figure, this is about 200 to 400 watts (or 4.8 to 9.6 kilowatts over 24 hours) for the average American home.

Also: This BlueAT power station with wheels has ruined the way I charge my tools and devices

How much power you can draw depends on factors like the size of your solar panel setup, watts, etc. How much sun do you get in your area (called Peak Sun Hours or PSH), and don’t forget to account for losses through inefficiencies, shading, and dust and dirt on the panels (called PSH). shoddy).

The drawdown figure may vary, but I’ve settled on 0.77 (equivalent to a 23% loss), which errs on the side of pessimism.

Harvested Energy (kW/day) = Panel Output (kW) × Maximum Sun Hours (PSH) × Derate Factor (0.77)

If you live in Alabama and get an average of 3.5 hours of sunshine per day, a 1-kilowatt (1,000-watt) solar panel array will collect:

1 x 3.5 x 0.77 = 2.7 kWh

Go to a place like Arizona, where there are about 6.5 hours of sun, and that figure increases greatly.

1 x 6.5 x 0.77 = 5 kW

How does this work?

You place your solar panels in the garden or on the balcony (balcony setup is great for people renting or living in apartments), connect them to a microinverter, plug them into an outlet, and voila, you’re harvesting solar energy while the sun shines. As long as you’re putting together 200 to 400 watts, you’ve covered the base load.

Also: I used the same power station to keep my off-grid cabin running – how it all works

OK, but what about the surplus?

Well, you have options. The surplus can go into the grid (you are unlikely to be paid for this, at least under current household electricity tariffs, but this may change), or you can send the surplus to the power station for later use. Adding a power station to the mix will increase costs.

So, what’s stopping us from using plug-in solar?

Bottom line: It’s mainly government red tape.

While plug-in solar is available in some countries like Spain and Germany, where you can go to a superstore and buy a plug-in solar setup, the US and UK lag behind. (Here in the UK, Anker has just unveiled SolarBank 4 E5000 Pro –What a mouthful! – Before the rules changed to allow these systems.)

based on data AvailableIt seems that Utah is the only US state so far that has legalized the use of plug-in solar units, with 29 other states enacting legislation to make them legal. Utah allows systems up to 1.2 kW without utility approval or fees. As far as legislation currently in the pipeline is concerned, most states are sticking to that 1.2 kilowatt limit.

Also: How I Boosted the Power of My Portable Solar Panels by 30% – 11 Expert-Approved Tips

there is an exception coloradoWho wants to increase that limit to 1.92 kilowatts. Compare this to the UK and Europe, which limit power to 800W.

costs and benefits

Cost is also undoubtedly deterring plug-in solar, as these systems are not cheap, especially compared to the cost of electricity (which is, on average, about 17 cents per kilowatt).

1,200 Watt Plug-in Solar Kit Currently you will set yourself back about $2,400. My guess is that as more states promote plug-in solar and more players enter the market, prices will go down.

If you live in Utah and you dropped $2,400 on the system, how much will this save you? The best case PSH for Utah is 7 hours, and plugging this into the above equation gives:

1.2 x 7 x 0.77 = 6.5 kWh

That’s a lot of electricity, costing about $0.86 per day (based on Utah electricity costing $0.1333 per kWh in February). government data), or some $315 per year. Assuming everything goes smoothly, you will recoup your initial investment in 7.5 years.

If you are using a plug-in solar system to cover base load during the day, this figure becomes quite disappointing. Assuming your base load is 400 watts, your plug-in solar will cover 2.8 kWh during daylight hours, but it only costs $0.37 per day, or $135 per year.

This means it has taken you 17 years to pay for the system.

Also: I spent two years testing wind power at home – which is why solar is still my favorite source

You either need to run much more during the day than base load – such as running heavy appliances like AC or heating, or charging an EV – or funnel the extra electricity into the power station (which, as I’ve already mentioned, significantly increases the cost of your setup).

Is plug-in solar safe?

One concern raised by legislators in some states is that plug-in solar installations may not be safe. Anything can be unsafe (lithium batteries are now A major cause of house fires), so there is a risk that plug-in solar can be misused or damaged to the point where it becomes unsafe. All plug-in solar systems must conform to National Electrical Code (NEC) regulations and require Underwriters Laboratories (UL) certification.

It’s just as safe as anything else we use.

i have one EcoFlow PowerStream Microinverter For over six months, running on an isolated test grid (plug-in solar isn’t even legal in the UK yet, so I’m limited to test systems), and I haven’t had any problems with the hardware.

Do you need plug-in solar?

Right now, plug-in solar is a niche product, which means prices are high and it will take a long time to pay off. But as more countries and states open up to plug-in solar, I expect competition to increase and prices to drop.

Also: American Airlines has new portable battery rules — here’s what travelers need to know

My advice right now is that if you live in a sunny place and use a lot of electricity during the day – perhaps you charge an EV or have a power tower, as I do – you can cover your costs in a few years. But if you live in Alaska, where you get a few hours of sunshine a day, and all your system is powered by an Internet router, it’s not worth it. at least for now.

But keep an eye on this space, as there’s going to be a lot of development in the coming months and years, and prices can change dramatically.