Plug and play solar energy storage system for the home

Bosch-BPT-S5-Hybrid3Bosch is selling a near plug and play energy storage system for home use, the BPT-S 5 Hybrid, a refrigerator-sized cabinet that houses a large battery, charge controller and inverter, to simplify integration with a house’s existing solar and grid lines.  Installation is estimated at a mere two hours!  It’ll charge up when your solar panels are producing excess energy, and discharge that into your house as needed at night.  Unfortunately…it’s only available in Germany at this point. 🙁

Making fuel from air

A company in England, Air Fuel Synthesis, has demonstrated a method of making a liquid hydrocarbon fuel from nothing more than air.  Well, more specifically, they say the process:

“captures carbon dioxide and water from the air, electrolyzes the water to make hydrogen, and reacts the carbon dioxide and hydrogen together to make hydrocarbon fuels”

Naturally, they believe it is a scalable process but is so far confined to laboratory volumes – they’ve produced five liters since August, which is fantastic but they have a ways to go.  What’s key here, too, is how much energy is consumed in this process, something that so far I can’t find details of.  If powered by solar or wind, though, a process like this could theoretically be nearly carbon neutral, yet still provide fuel to power cars and trucks.  Or, if coupled with a utility-scale solar panel installation, some excess solar energy could be funneled to this process during the day, producing fuel which can power generators during the night when the panels aren’t producing.
Read more over at Wired, Inhabit, or Jalopnik.

Peak Biofuel?

I’d often considered biofuel to be an interesting development, one that could hopefully replace fossil fuels, with no real downside (though not exactly carbon neutral).  However, I came across an interesting article talking about how biofuels, at least as currently envisioned, require phosphorus for growth.  Meaning, we now face a ‘peak biofuel’ situation, or rather, ‘peak phosphorus’, where biofuel production capacity can be tied to limits on phosphorus production!  Thus, while still worth pursuing, we need to be a bit more realistic in our expectations of how widely adopted biofuels can ever become.  You can read the whole article here.

Catalytic-driven hydrogen generation

I’m seeing more and more reports of studies involving the use of catalysts to generate hydrogen.  This is a fascinating development, so I’ll be posting more of those here (follow this link for a description of the work CalTech is doing on this).  The basic premise is to heat water to a point where an added catalysts splits the water molecules into their oxygen and hydrogen components, the hydrogen is then used as fuel.  More importantly, the hydrogen can then be stored for later use.  For example, imagine a solar thermal collector used to generate the heat to drive this reaction, with excess hydrogen being stored for use during night.  It’s a sort of hydrogen battery, if you will.

This research is still in the laboratory stage, but is an interesting path to sustainable energy solutions which address the energy storage concerns.

NREL energy analysis

The National Renewable Energy Laboratory (NREL) has published a study that looks at the extent to which renewable energy can meet the demands of this country over the next few decades.  What they found was that existing technologies, that are commercially available today, are more than sufficient to provide 80% of total electricity generation by 2050.

No one wants to pay higher prices for electricity to fund this, but the reality is that the course we’re on is unsustainable and change is inevitable.  The sooner we begin that change, the smoother it will go.  So what are we waiting for?

Deaths by energy source

Forbes has an interesting article looking at the health effects of different energy sources, more specifically, the number of (human) deaths per unit of energy produced.  For all the publicity nuclear energy accidents get, it’s worth noting that the mortality rate from nuclear energy is about 90 deaths per tkWhr (trillion kilowatt hour of energy produced), while coal is 170,000 deaths per tkWhr!  To be fair, that coal rate is the global average and the US is much better than that (mainly because of existing pollution controls)…but even then, it’s a whopping 15,000 deaths per tkWhr.  The complete list:

Energy Source               Mortality Rate (deaths/trillionkWhr)

Coal – global average         170,000    (50% global electricity)

Coal – China                         280,000   (75% China’s electricity)

Coal – U.S.                               15,000    (44% U.S. electricity)

Oil                                               36,000    (36% of energy, 8% of electricity)

Natural Gas                                4,000    (20% global electricity)

Biofuel/Biomass                    24,000    (21% global energy)

Solar (rooftop)                              440    (< 1% global electricity)

Wind                                                 150    (~ 1% global electricity)

Hydro – global average          1,400    (15% global electricity)

Nuclear – global average            90    (17%  global electricity w/Chern&Fukush)

You can read more over at

Solar powered boat completes round the world journey

I have mixed feelings about this one.  PlanetSolar is less than one day from completing a circumnavigation using a boat powered only by the sun; it’s taken them about 600 days to do this.  I’m not quite sure what they’re trying to prove here.  If you want to go ‘green’ on your trip around the world, solar just can’t compete with wind.  Sailboats are a proven ‘green’ technology that are faster and can go more places in the world’s oceans (PlanetSolar is limited more to the equatorial regions where the sun’s more direct rays result in more powered gathered by the solar panels).  Likewise, storms pose little challenge for sailboats but the cloud cover hurts the performance of PlanetSolar.  Yes, solar is useful even on sailboats for powering shipboard electronics, but when it comes to propulsion, the abundant wind on the oceans is a fantastic, proven resource.

A solar boat?  I don’t get it.  Hoist the mainsail, matey.

Advances in Solar Panel Technology

Solar energy technology is advancing fast enough that I’ve decide to lump together several updates into single posts now and then.

To start with, the Frauenhofer Institute has showed off some highly flexible solar panels, placing them on a ski helmet.  This may not sound like a big deal, flexible panels have been around for a while, right? Well, not really.  Typically, when you see a flexible panel, it can only bend in one direction – around a cylinder, for example.  This new technology allows the panel to conform to compound surfaces, like a sphere or, in this case, a ski helmet.  For now, testing this on ski helmets is a good, extreme use environment (the solar cells become more efficient with cold, but batteries become less efficient).  Just about ever helmet design could benefit the user with this – motorcyclists, construction workers, bicyclists, you name it.  The first product, a ski helmet, is targeted for sale at the end of 2012.

Solar cell comparisons invariably come down to one key metric, the efficiency.  Going along with this is measuring reflectance, or how much solar energy is reflected and thus unable to be converted into electric energy.  Scientists at Natcore Technology have set a new record for this, producing wafers that absorb an incredible 99.7%!  This promises to increase solar panel efficiency, which in turn will lower cost and increase adoption of solar energy worldwide.

There are two main types of solar energy devices on the market today – photovoltaic panels that covert visible wavelengths into electric power, and solar thermal that takes the abundant infrared radiation emitted by the sun and uses that heat energy to do the same (via turbines or other methods, or just using the heat directly to heat a house or water heater).  Now, Naked Energy has designed a hybrid solar energy system which has solar panels to make electricity, but also pumps water through the tubes to make that heat available for other energy uses (heating a house being the most feasible).  It’s not a utility-scale sort of system, but great for home or business users.

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