Portable Laptop Computer Charger Plan

[ledsion]

you mind is so good!

LED lights make their own lighting tools is a good choice Oh, LED lights are bright enough, enough power

[ledsion]

Learn electronics

Learn electronics, I also like the landlord and yourself to do the LED lighting lamps

[inetdog]

I consider any unit that is to produce when it moves a total waste - 99% of the time that will be correct

The only practical mobile solar power system I have ever seen was used for a cross country trip using a custom recumbent bicycle with a 200lb. (loaded) trailer. The solar panel was mounted to the trailer and provided power to a battery pack which ran the computer(s) for the system while traveling and the Internet satellite connection when stopped to camp. (Before the days of cell phones with data access.)
It was only practical because of several uncommon system characteristics:
1. The saving grace was that the weight of the panel and battery was carried by the trailer.
2. The motivation was that it might be days between opportunities to connect to the grid to recharge, or a grid connection to recharge might be available at a mid-day or overnight stop.
3. The electronics was all designed for low power consumption, so the battery did not need to be too large.

This was part of the 1%.

[Sunny Solar]

I think its possible to buy roll up /fold up solar panels for less than $5k a sq ft. ??

[russ]

I think its possible to buy roll up /fold up solar panels for less than $5k a sq ft. ??

What does 5$ per sq ft have to do with anything?

[PNjunction]

Here is my plan, and I would like to get your feedback:

(1) PowerFilm F16-1800 30W Foldable Solar Panel Charger (Amazon) :
Operating voltage: 15.4V, Operating Current: 1.8A

(1) Energizer XP18000 Universal AC Adapter with External Battery for Laptops, Netbooks, and More : Rated Input: 19V, 3.5A

The PowerFilm folding panels are very high-quality. Yes, very expensive, but built like tanks. Takes 100F + temps on hot concrete well, although I don't recommend that. You won't regret it even if your wallet does. Accessory cables built to same standard. OCV's are typically 19-20 volts or so, and I feel that the 15.4v rating is a conservative VMP.

The Energizer XP18000 is another good quality product. I have the 8000. Also known as "XPAL". Note that the AH capacity rating is only at 5V. The problem is that the battery is not user-replaceable afaik, and by the time you get one off the shelf, it might already be 3 years old, so you are taking your chances there. I could not find a date-code on mine, so I'm playing on borrowed time not knowing how long it has been dying in transit/storage.

I never tried charging it via solar and have lent the unit to a friend. I think you'll have to be the mad scientist and take the risk. At the very least, if it does pop, the PowerFilm is a nice investment, although for the price one could obviously get MUCH more in a solid panel. Then again, a 60w rigid panel won't fit into the map-pocket of your car door.

[Sunny Solar]

Do you have any idea what a lightweight, fold up PV panel costs ? about $5K per sq foot, if you can find them for sale.[ATTACH=CONFIG]2128[/ATTACH]

Russ this might answer why I asked.Sunny Solar
I think its possible to buy roll up /fold up solar panels for less than $5k a sq ft. ??

[bkbatts]

How to insure adequate cells are facing the sun at any given time to get enough power to use - unless you somehow install a tracker system that rotates your head or you walk in circles to follow the sun

LOL

[SolarWatt]

Check this link:

http://www.ebay.com/itm/NEW-WIND-TUR...00739054519%26

Can it help ??

[russ]

Check this link:

http://www.ebay.com/itm/NEW-WIND-TUR...00739054519%26

Can it help ??

A useless piece of junk. The specifications are made up BS. The voltage increases linear with the wind speed which does not happen. There is no overspeed protection.

[inetdog]

A useless piece of junk. The specifications are made up BS. The voltage increases linear with the wind speed which does not happen. There is no overspeed protection.

Actually, the description shows the voltage (probably Voc, of course) increasing linearly with RPM. That is not BS. But there will not be a linear relationship between windspeed and either no-load or max power RPM. The Vmp for a given RPM will also probably not increase linearly as Voc does.

That table may be accurate but still either useless or misleading.

[russ]

in a 10 mph wind, a 10 square foot rotor would likely put out 17.5 watts. A perfect turbine would put out 29.5 watts. If the turbine you are looking at does better than that, there's something wrong with their data.

Power Curve (Watts)
Wind Speed mph -[m/s]	Betz Limit per m^2	Good Turbine per m^2	Betz Limit per ft^2	Good Turbine per ft^2
1 - [0.45]	0.031	0.019	0.00295	0.00175
2 - [0.89]	0.254	0.151	0.0236	0.0140
3 - [1.34]	0.857	0.508	0.0796	0.0472
4 - [1.79]	2.031	1.205	0.1887	0.1119
5 - [2.24]	3.966	2.353	0.3685	0.2186
6 - [2.68]	6.854	4.066	0.6367	0.3777
7 - [3.13]	10.88	6.457	1.01	0.5998
8 - [3.58]	16.25	9.638	1.51	0.8954
9 - [4.02]	23.13	13.72	2.15	1.28
10 - [4.47]	31.73	18.82	2.95	1.75
11 - [4.92]	42.23	25.05	3.92	2.33
12 - [5.36]	54.83	32.53	5.09	3.02
13 - [5.81]	69.71	41.36	6.48	3.84
14 - [6.26]	87.07	51.65	8.09	4.80
15 - [6.71]	107.1	63.53	9.95	5.90
16 - [7.15]	130.0	77.10	12.07	7.16
17 - [7.60]	155.9	92.48	14.48	8.59
18 - [8.05]	185.1	109.8	17.19	10.2
19 - [8.49]	217.6	129.1	20.22	12.0
20 - [8.94]	253.9	150.6	23.58	14.0
21 - [9.39]	293.9	174.3	27.30	16.2
22 - [9.83]	337.9	200.4	31.39	18.6
23 - [10.28]	386.1	229.0	35.87	21.3
24 - [10.73]	438.7	260.2	40.75	24.2
25 - [11.18]	495.8	294.1	46.06	27.3
26 - [11.62]	557.7	3330.8	51.81	30.7

[russ]

From Betzs law - The key concept that this formula shows is that when the wind speed doubles, the power available increases by a factor of 8.

[SolarWatt]

Okay Okay......
I just read about Betz law in wikipedia - very interesting.....

[russ]

Actually, the description shows the voltage (probably Voc, of course) increasing linearly with RPM. That is not BS. But there will not be a linear relationship between windspeed and either no-load or max power RPM. The Vmp for a given RPM will also probably not increase linearly as Voc does.

That table may be accurate but still either useless or misleading.

Sorry Dave but the spec is BS as best I can tell -