One interesting point that this post speaks to is that fact that core electronics functionality is worth nothing if you can't interface it to the outside world. Here we read about the importance of connectors for photovoltaics, particularly robust connectors for the harsh environments in which PVs cells are typically used. But this also applies to the internal construction of the PVs themselves, in terms of the bus-bar foils and the adhesives used in assembling the different layers of the PV cell. Interesting stuff!
Connectors and cables are often one of those overlooked areas in a system design, or at least looked at last when there's no more budget left to do them right. In consumer electronics, it seems that the cheapest parts are spec'd in as the "afterthought" components. I agree, Alex, interconnects are vital, all the way from the chip's internal connections to the panel's external ones.
Isn't it ironic that it took so long for the PV market to reach the high volumes needed to drive down cost-per-watt, the solar power holy grail, and the next step is oversupply? But actually, that's the way of semiconductor-based technologies, and the majority of PV solar cells are based on polycrystalline wafers. It will be interesting to see how different the curves may be for thin-film or some of the more exotic competing technologies.
The overcapacity problem like in Lithium batteries too, means one needs to make their own market with added value as the price of PV, less than $1.50/wt now retail well shopped, means making money on just panels puts them in the commodity braket, also like lithium batteries.
So how does one stand out? By taking money from other pies. For instance installing PV it's no longer the panel price that is the big cost but instalation. So PV makers need to build 1-1.5kw modules that are plug and play, ie, fold out hinged or maybe bolt together panels prewired with a built in grid tie inverter. Then one can set it up in the front/back/side yard and plug it into any 120vac outlet.
These will be profitable at $3/wt now and cut installed costs for the customer by 40% or so. At these prices for homes, buildings in many places that pay retail power prices is already at parity in many places.
And if all the real costs of coal, oil were in them, not only wouldn't you need to subsidize RE but RE would cost less by a good amount.
Or build, own solar farms and sell the power for profit.
It's kind of like the homeowners now who can't sell their homes because no one can get a loan. But they could do the loan themselves and sell at a better price and faster.
The bottom line is if the market you are in is soft, get another market or steal market share by innovation!!
On the topic of “selling back” power for profit, I was astonished to learn from a close associate who retired from 35 years as an EE and launched a small State-Licensed Solar contracting company in South Florida, that selling power back into “The Grid” has been declared Illegal in Florida. (Really-?!) I have encouraged my associate to seek anti-trust counsel.Learn more at http://schroedersolarenergy.com
Jerry dycus, why so insulting? I am not EE but I do understand the physics of this. I think we both agree that the electrical code requires protecting the network from back-feeding ("islanding"):
You are right that under most circumstances 1kW would just short but one could easily come up with a scenario where it wouldn't, e.g. when all the other neighborhood's transfer switches turn off, and the feeder wires are down, and the Pepco crew shows up to repair it. Unlikely, but possible, which is why UL 1741 is there.
Standard gensets use electro-mechanical transfer switches to accomplish that. You point that new grid-tie systems have automatic transfer switches; the link above describes how they do it, with small 'hunting' around the feed V/f, which I didn't know about---quite clever, that. Still, using your 20A wall outlets seem like a wrong way to go; limited current, and just the sheer inconvenience--there are no outlets on my house anywhere near where I might put the solar panels up. The only sane way to wire them would be a dedicated circuit going up into the attic, which I would wire permanently with a disconnect in or near the distribution panel.
Transfers the control of a large number of motion axes from one numerical control kernel to another within a CNC system, using multiple NCKs, and enables implement control schemes for virtually any type of machine tool.
Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.