stanz wrote:These panels should do the trick for you: http://sunelec.com/index.php?main_page= ... ts_id=1246
$130 each, 110W at 110 vmp, minimum purchase of four would give you 440 watts peak.
neptronix wrote:https://www.bullfrogpower.com/home/onfaq1.cfm#ont3With Bullfrog Power, you continue to draw electricity from the regional electricity grid, or natural gas from the national natural gas pipeline systemâ€”just as you always haveâ€”and Bullfrog's generators inject renewable electricity or green natural gas onto the respective energy system to match the amount of electricity or natural gas your home or business uses. No special equipment or wiring is required.
So it's like buying carbon credits ... you hand someone money, they promise they'll do something, but you have no way of verifying that they're actually doing what they're doing.
Oh, they have audits through some 3rd party company.. that they picked..
I'll take the panels please.
Gordo wrote:I still like the simplicity of a panel on the bike.
liveforphysics wrote:AC power comes in, gets rectified to DC, filtered with a cap, then switched at 50-500khz, run through a step down transformer, rectified again, and then sent to a regulation stage (linear or switching), then filtered, and sent to the pack.
Just hook the cells to the battery if you wanted to do it that way. (and either select the right panel voltage, or use a simple $5 HVC circuit to open a relay when they are topped off) But again, cells on the bicycle itself in no way make any sense, likely the most wasteful application you could use the cells for.
dogman wrote:Going big with solar can depend a lot on the local tax incentives, and the deal you get with the electric company. Todays headline on the front page, 100kw PV installed and running on the cheese factory in NM. Plans to make it 300kw.
Meanwhile, the big news from Texas, dealing with the exact same El Paso Electric company, People who installed PV on their homes got electric bills that were up to 60% HIGER, than before. ????? It turns out they didn't read their contract too good, and texas state law didn't forbid EPE from sticking it to them. Turns out, the power produced does not go into their house directly. It got metered, and sold to EPE for .05 per kwh. Then they could buy the grid power they actually used for .15 per kwh. Hell of a deal eh? Add to that, they turned on stuff and left it on, thinking they had kwh to burn.
Better deal for New Mexico customers. A few years back, EPE had the same contract in place for NM. I read it, and said, no way no grid tie for me now.
jbond wrote:If you have a boring (!), standard 36v or 48v E-Bike with the typical Li-On battery and charger, then I think plumbing direct into a spare charger makes a certain amount of sense. Switch mode power supplies really don't care what input voltage they have as long as it's above the output voltage. And the charger already knows how to charge LiOn batteries and has suitable cut offs and charging strategies. So applying enough solar cell voltage just after the mains rectification stage should work fine. On the link I pointed to, they'd successfully linked 3 12v solar cells to a standard charger. They had a need to put cells on the bike and mounted them on a trailer but of course, the cells could be stationary on the garage. The point I was trying to make was that for a minimal setup you can do away with the intermediate batteries and inverter or the big cost setup of solar into the grid.
liveforphysics wrote:Linear regulators eat a bunch of power.
You just want an HVC. I think Gary even sells them for $10usd assembled or something on that order of cheap. Of with 4 resistors and a mosfets you can make your own for $2.
Then you've got the best possible charge efficiency from cells to battery. It also takes up hardly any space, you could have it inline with the wire rather than a separate box.
brisbanebikie wrote:One day the surface area of your helmet will be enough to charge your bike...
solbike wrote:2) Get a 12V 80-100W panel, a 5-10A solar regulator, a 80-120Ah deep cycle lead acid (AGM) battery, an ~300W inverter (modified or true sine wave, both seem to work).Connect all of these items together then connect your regular charger to the inverter. Approximately $1300. Advantages - can charge any time you like, system can be used for other applications, relatively small, can possibly be put in a trailer for cross county touring. Disadvantages - need an extra storage battery, losses through AC/DC conversions.
brisbanebikie wrote:"Imagine a world where sunlight can be captured to produce electricity anywhere, on any surface. The makers of thin-film flexible solar cells imagine that world too. But a big problem has been the amount of silicon needed to harvest a little sunshine.
Now, researchers [led by Harry A. Atwater] at Caltech say theyâ€™ve designed a device* that gets comparable solar absorption while using just one percent of the silicon per unit area that current solar cells need. The work was published in the journal Nature Materials..."
- http://www.scientificamerican.com/podca ... p-10-02-15
One day the surface area of your helmet will be enough to charge your bike...
How much power could I make with a 3" x 5" solar panel? Enough to charge up a 250Whr battery pack in two hours?
auraslip wrote:How much power could I make with a 3" x 5" solar panel? Enough to charge up a 250Whr battery pack in two hours?