Went solar

[forgeblast]

How about the newer leds, with the heat sinks built into them. I was looking at gettting a bunch of them.

 

[eepete]

It's really hard to tell if there is enough heat sinking in a LED light, but if you can see signs that an effort was made that's a good sign. The manufacturers of the LEDs are making packages for the chips themselves that have both better thermal characteristics and make it easier to make a fixture for the LED that can get rid of the heat.
It would still take a tear-down, look at the parts, and a measurement of the LED surface itself to know for sure, hard stuff to do. And it's hard to tell by measuring the outside temperature of the device. A device with good heat sinking might be hotter on the outside than one with poor heat sinking. This would be because good heat sinking would move more of the heat to the outside of the device whereas poor heat sinking bottles up the heat and the rest of the device is like insulation, keeping you from feeling how hot it is.

I'd try one or two and see how they hold up. Until such time as a group like Consumer Reports starts measuring the LED die temperature and looking at the temperature rating of the capacitors in the device, it's very hard to tell what you have. It's kinda like some tractors- you have to run them for a couple hundred hours to get a feel for how well they will hold up.

Sorry I don't have a better answer...

Pete

 

[RobertN]

I have been eyeing panels for my 5th wheel. Have an acquaintance with health issues. They have medical equipment they need to run at night. They boondock/dry camp. He runs a couple extra batteries, and has solar. He can run primarily battery/solar. He only uses the generator fo big items, and occasionally on cloudy days to boost the battery charge. AC is not an issue; he camps mainly on the N. Calif coast where the temps are very mild.

For a long time, we have been more energy concious, mainly because of the bills... And, living on a well after growing up on city water too. I am amazed at how much water my parents and brother waste down in town...

I would agree with that... having recently bought an RV that we take camping/dirtbike riding. We are always 'boondocking' which is camping without a grid hookup, just what was in the battery when we started and what we can produce with a generator. Kind of an eye opening experience as to what you take for granted at a house where you just 'flip the switch'. Goes for water usage to

 

[clemsonfor]

CFLs tend to not work from an economic point of view if they are on for less than 5 minutes. Like a well pump, they may run forever but only turn on so many times. Incandescence have the same problem, but with a lower price they don't have to turn on as many times to be cost effective. There is a lot of manufacturer variation in quality and how much heat CFLs can take, and some of the problem here has been a rush to market with poor/cheap designs.
Pete

If you do an economic analysis of a CFL for say 10000 hours or something with a common incandesant that will burn out in x hours vs the CFL in y hours it will be cheaper considering the fewer bulbs used (even though at a higher price) and the cheaper perhour useage cost.

Also mythbusters did a turn on turn off test and the CFL lasted longer i think than the incandesant and the LED lasted longer. Get on the Discovery website and search for the energy efficient episode or lightbulb episode or something. I dont miss an episode so i remember seeing the test. They had some set up that would cycle on off every so many seconds, there theory was the same that this would kill the CFL sonner than it should. I think i remember the results right?

 

[eepete]

Clemsonfor, as far as CFL life goes it all comes down to temperature. If you compare a CFL vs. incandescent in a table lamp where the bulb is upright, the CFL is a big win. Put a 23W CFL in a ceiling can with no ventilation and it gets so hot that the electronics doesn't last and even with the energy savings it's a loose.

Had not seen the mythbusters episode on on/off tests, and it would be great if there was a brand that did better. Like the old florescent with the starter modules vs. newer electronic balast there are different schemes for starting the bulbs. Good ones (long life) cost more than bad ones, nothing new there :laughing:. I'd love to see the episode. What would be interesting is to compare the number of on/off cycles the bulbs can take, then look at the cost of the bulbs and see what's cheaper. If the CFL cost 4 times as much as the incandescent, than it needs to have at least 4 times the turn on/turn off life to be a wash. If the lifetime of the CFL is determined by on off cycles, then the energy savings is much less important. So a bulb in a pantry closeset that gets cycled a lot but is rarely on for more than a minute or two is the test case here.

I have some high sconces in the TV room that I run 5W CFLs in (so they are roughly equivalent to a 20 watt incandescent). So they are on for many hours each day. They are horizontal in an open top fixture. Between the low wattage of the device and all the air, they run super cool and should last a very long time.

Even if you blow the temperature of a LED a bit, you'll still get OK light out of it at 25,000 hours and the limiting factor might be the electronics.

Finally, just for grins, here's a circuit board I did so I could play with LED light. The right side has two 1 watt LEDs. LEDs want a constant current, so the little circuit on the right is a switching power supply that makes constant current. There are now chips that do this explicitly designed for LEDs, this is a modified power supply chip. The driver is about 85% efficient, the new chips are closer to 95% efficient. You can see the .090 tick aluminum heat sink. It's about 2" long. After the LEDs have been on for 5 minutes, the heat sink is about 40 degrees above ambient, a bit hotter than I'd like. The dies (actual leds) are about 15 degrees hotter than the heat sink. On the left there are low power LEDs for colors- they don't need much heat sinking so the extra foil on the board is enough. I did that so I could have the top of the room light up in Red, Green, and White during the holidays :thumbsup:.

The 2nd picture is how I installed 27 of these in catwalk of our great room. They were covered with a strip of white plexiglass. The whole system runs on 10 to 20 volts DC. The circuit boards all fit in a channel that is the width of a 2x4. The aluminum foil helps reflect light back up in the room- these are pointing towards the ceiling for indirect light.

The system is no where near commercially feasible now, but everything that makes it expensive is electronics stuff that keeps getting cheaper as seen by the LED driving chips available now. The LEDs I paid $10 for are now in the $5 range. The effect of the distributed, diffuse light is very nice. I have three clusters of 9 boards. I have one of those as part of the emergency light system for the house. The problem gets harder/more expensive when you have to take 120V AC and make a .3 or .5 amp current source at about 6 to 24 volts vs. having a DC power source to begin with.

Hope this isn't a thread hijack...

Pete

 

[MossRoad]

Storm, all energy sources get some form of government subsidies. But I also realize that the argument "well, everyone else is getting money from the government" is a pretty weak argument. An interesting question is this:

If none of the energy sources we used received government assistance, tax breaks or preferential regulatory laws, then would the price of electricity be high enough that solar would be finically feasible with no tax credits? Wish I new the answer...

Moss Road, As for the CFLs, I put a lot of ceiling can lights in my house only to find out that the CFLs have much lower life in them. They are best when used in the upright or sideways position in an open air environment. In a can light, the electronics is taking the brunt of the heat from the bulb and it runs very hot. Often the plastic in the base turns brown from the heat. The capacitors and semiconductors have much shorter lifetimes than if they are kept cooler. Parts that can withstand the heat are much more expensive to use. Googling CFL problems has more on all this.
Fortunately, I also put a number of sconce type lights in my house for hallways and bathrooms and those work very well with the CFLs. I also used dimmers on incandescent bulbs for the bedroom and my office. With incandescents the combination of a slow ramp up when turned on and running at partial brightness means long life and lower energy use.

CFLs tend to not work from an economic point of view if they are on for less than 5 minutes. Like a well pump, they may run forever but only turn on so many times. Incandescence have the same problem, but with a lower price they don't have to turn on as many times to be cost effective. There is a lot of manufacturer variation in quality and how much heat CFLs can take, and some of the problem here has been a rush to market with poor/cheap designs. Another problem is that since the bulbs rectify the AC and make DC for the electronic ballast, they do not draw current like a resistive incandescent bulb. They draw a peak current near the top of the AC wave form, and they draw current out of phase due to the capacitor in the bulb (in other words, bad power factor). So the 13W CFL that replaces the 60W incandescent really requires generation capacity of close to 30 watts from the power plant, adds a lot of harmonic distortion, and has bad power factor. The power bill is good for the owner since there is no charge for harmonic distortion or power factor problems but the reduction of power plant resources and pollution is half of what it might seem. Bottom line, they have a place in the house, cut generation requirements in half, are great for the light you might leave on for an hour or two, but can't replace every incandescent bulb.

Note that LED lights will have the same sorts of problems. If you look at efficiencies (lumens per watt kind of stuff), and the incandescent bulb is a '1', then florescent is a '4' and LED is a '5'. But the LED still has electronics in it, still has the harmonic distortion and power factor problem, and still has the problem of getting rid of heat in a standard fixture where the electronics and bulb are in the same screw in device. The life of the LED is proportional to how cool you keep it, so there will be problems with companies cheaping out on heat sinking the parts as well as problems with the lifetime of the electronics driving the LEDs.

soapbox:
It's sad that the world can't agree on a form factor and connector style/pinout for external electronics to drive fluorescent bulbs and LED lights (different boxes for each type). When you remove the heat from the electronics, the life of the systems makes the economics work. But that means new fixtures and a means to access the electronics. Perhaps even sadder is that if the world can't agree on this sort of thing, how do we solve the really big problems?
/soapbox

If done right, both bulb types are economically viable in terms of high initial cost of the bulb vs. savings from low energy use. The two problems are getting the designs right and getting consumers who will pay now and save later.

Hope this wasn't a TMI post...

Pete

Heck, that was an elegant post I ever read one. It makes complete sense. I have CFLs in an outdoor fixture hanging down. It lasted over a year being on continuous. I have some in my basement can lights hanging down. Not so good. They lasted less than half a year. I have one in a floodlight fixture over my kitchen sink. Looks awful but there is an air gap around it and heat escapes the fixture. It has also lasted well over a year. I have noticed the browning of the bases in the ones in the cans. I still have mostly incandescents in the house because they are all dimmable. I like my soft, yellow glows at dinner or during a movie. I also have them come on at 30% in the morning so my wife can walk around the house when she gets up without being blinded. They gradually brighten over the course of a half an hour. Can't do that with cheap CFLs.

 

[RobertN]

The one thing I have noticed with LED is it is not as "natural" of light. I know my headlamp is very blue. The thing lasted two duck hunting season before needing batteries which is nice.

Most other lighting gives a wider spectrum. LED's will emit depending on the junction makeup; different dopants yield different ranges in the light spectrum. Guess I ned multi-junction LED's with multi dopant gates for a wider portion of the white light spectrum

Even if you blow the temperature of a LED a bit, you'll still get OK light out of it at 25,000 hours and the limiting factor might be the electronics.

 

[sodamo]

I haven't read the whole thread so sorry if I'm repeating something. I believe that one of the ways that money is saved when the decision is made to go solar is that you become much more aware of your power usage. This helps you to conserve and become more efficient. In the long run much less energy is used and wasted. More efficient use does not mean a lower quality of life. My family (now just wife and me) has been off the grid for 28 years.

Loren

Totally agree

 

[eepete]

On the topic of the color of CFL and LED lights: CFLs use mercury gas that's ionized and emits ultra violet light. Then a phosphorous coating on the bulb converts the ultra violet into visible light. A "white LED" also produces ultra violet light and also uses a phosphorous coating to shift that to visible light.

So the composition of the phosphorous coating determine the color temperature of the light. You see this in regular long-tube florescent as a "cool white" or "warm white" type of bulb. The "cool white" phosphorous is cheaper to make and has a higher efficiency as far as the conversion process is concerned. A lot of LED flashlights use "cool white" (higher color temperatures) to get more light out of them.

There are CFLs now that have an incandescent coloring, once that match the sun, and ones that are the "cool white". LEDs are also being produced in different color temperatures. The ones I used match the sunlight color spectrum. It's weird to have all that diffuse lighting in the room and have it be the same color as daytime when the room is lit by diffuse sunlight, but it's dark out. Incandescents also set our perception of what a "light should look like". Who knows, for the next generation all light might be considered perfect when it has the same color balance as the sun, which looks decidedly blue next to an incandescent bulb. If anyone remembers Ecktachrome slide film, it was available in "daylight" and "inside" versions (if I remember that correctly...)

Moss, tnx for the feed back. If/when I drone on too much just send me a PM...

Pete

 

[Phils]

When you run your generator are you powering the house or charging the batteries, or both?

Both, Mr. Lichen Lane.

The inverter for the water pressure converts to a charger when the generator is on (I have it limited to 100 amps 12VDC). If the water pump comes on, it is powered by the gen.

The appliance inverter does the same but I have it limited to 80 amps 12VDC and anything on is then running off of the generator while the inverter is charging the battery bank.

The entertainment+ lighting+ A/C inverter doesn't charge (it could, but the generator input isn't hooked up). I prefer electronics not get the "hand-off" when an inverter switches from inverting to charging and back, plus generator frequency and voltage can vary a little so this supplies cleaner power.

Our Maytag Neptune washer (on the appliance circuit) doesn't like this "hand-off". Too much electronics in it. We can't start or stop the generator when washing. If the washer starts while on generator, we don't shut off the gen until the wash is done. If the washer starts on inverter, we don't start the gen until the wash is done (or we can shut off the washer, start the gen, the restart the washer). The "hand-off" (either way) causes the washer to 'lock up' and never go into spin (when that happens we unplug it for 1/2 hour and then it's ok).

I just installed my first LED light last week. It's 80 lumens and uses 2 1/2 watts. I installed it in the range hood (yeah, I considered the heat, but it really doesn't ever get very hot where the light sits... I'm definitely NOT going to try an LED for the light in the oven). The light output is about the same as the bulb it replaced after going through the plastic diffuser. This is a light we leave on all evening until bedtime, and the little 40W incandescent was just too much power to waste for a "night light" in the kitchen.
That little bulb used as much power as each of the two big fluorescents in the kitchen and almost as much as the CFL there too (it's 27w for "60w of light").

Phil

Off-grid since 1977