Your Questions About Solar Powered Fan

Charles asks…

Does this solar panel/battery configuration make sense?

I know nothing about electricity but am willing to spend a good amount of money. Below is the setup I am thinking of (please let me know if I'm forgetting something or doing something retarded).

Purpose: To power a 50 Watt laptop, 90 Watt table lamp, 100 Watt fan, and a 2 Watt cell phone for 6 hours a day

Solar Panel: Sunforce 37130 130W monocrystalline solar panel (ideally designed for 12V batteries)
+
Charge Controller: Sunforce 60032 30 Amp digital charge controller (intended for use with 12V solar panels, handling up to 450 Watts of solar power)
+
Battery: 12V Concorde Sun Xtender (Absorbent Glass Mat, ideally designed for solar systems)
+
Xantrex 851-0700 XPower Plus 700-Watt Inverter (DC to AC)

The solar panel would be mounted flat on a roof in Washington, D.C. and exposed to the standard weather conditions 24 hours a day. Everything else would be inside. I am choosing to run the appliances on AC power because I'm not interested in buying DC adapters for every appliance I might potentially use. I know this is not cheaper than just getting electricity from the utility company but that's okay with me.

ssadmin answers:

A) Your solar panel outputs max 130 W and without any losses you need 242 W total, that's a problem…

B) What if it rains? Do you get power from the grid, or do you want to be self-sufficient.?

You need to know mAh rating of your battery. A 12V 1Ah (1000mAh) battery can provide 1A for one hr (12 W). So, if you know your Ah rating, you can figure how long you can last with no sun.

Ruth asks…

Does this solar panel/battery configuration make sense?

I know nothing about electricity but am willing to spend a good amount of money. Below is the setup I am thinking of (please let me know if I'm forgetting something or doing something retarded).

Purpose: To power a 50 Watt laptop, 90 Watt table lamp, 100 Watt fan, and a 2 Watt cell phone for 6 hours a day

Solar Panel: Sunforce 37130 130W monocrystalline solar panel (ideally designed for 12V batteries)
+
Charge Controller: Sunforce 60032 30 Amp digital charge controller (intended for use with 12V solar panels, handling up to 450 Watts of solar power)
+
Battery: 12V Concorde Sun Xtender (Absorbent Glass Mat, ideally designed for solar systems)
+
Xantrex 851-0700 XPower Plus 700-Watt Inverter (DC to AC)

The solar panel would be mounted flat on a roof in Washington, D.C. and exposed to the standard weather conditions 24 hours a day. Everything else would be inside. I am choosing to run the appliances on AC power because I'm not interested in buying DC adapters for every appliance I might potentially use. I know this is not cheaper than just getting electricity from the utility company but that's okay with me.

ssadmin answers:

Let's start with the most simplistic calculation. The panel can produce under ideal sun conditions 130 Watts x 5 hours of sunlight = 650 Watts-hour DC. Let's assume that charging the battery + converting DC to AC will waste 20% of that power (the waste will be converted into heat). This leaves you with 650X0.8=510 Watts-Hours.

Your consumption is (50+90+100+2)X6=1452 Watts-hour. Unfortunately, the law of energy conservation tells you it is impossible to spend more energy than the energy available.

You must have at least 1452/650=2.25 solar panels (130 Watts each) to have enough energy.(Let's round it to 3 panels). The charge controller is the right size, the inverter is a bit over sized. I can not establish an opinion about the battery size because I don't know it Amp-hour capacity

Look into this reference to see how to properly size an off grid system

http://www.solar-energy-for-home.com/off-grid-solar-power.html

Linda asks…

solar panels-advice regarding pricing and safety?

purchasing batteries again and again for powering a room, with five energy savers, a laptop, DSL, fans, mobile chargers is becoming very expensive.

have heard about alternate energy sources,

the best for an individual with limited space and budget sounds like solar power.

please help with the following queries

1) is it safe?
2)will it ever explode due to heat?
3)how much will it cost?
note: i have to make it from scratch, so how much will one solar panel cost,
4)what power does one panel deliver?
5)whats the current?

can you please give a link to a resource which has complete step by step instructions for making a room powered by solar energy.

thanking all in advance, best gets 10 points…

ssadmin answers:

Using solar system is very safe , use a sealed batteries which could last for five years, we have been installing these batteries outside and exposed to excessive heat from sun and never exploded, for your use the cost could be around US$ 6000 to 8000, the power depends on the size of panel and number, however you can add to the solar panels a wind mill that could compensate power and reliability in case there is no sun.

John asks…

electric motor to suit 18v solar panel?

is there any other types of fans capable of running 18v of power from a solar panel? other than radiator fan motors. i am trying to build a homemade air conditioner so i need one that's fast. would two 12v (14cm diameter) CPU fans able to survive 18 volts? thanks in advance

ssadmin answers:

Http://reviews.homedepot.com/1999/100485407/18v-personal-fan-reviews/reviews.htm
http://www.ryobitools.com/catalog/18v_oneplus/specialty_tools/P3300

Ryobi makes a great unit that runs on an 18v battery. It has 2 speeds, is highly reliable, and can take a real beating. You can easily solder in a home unit, through the battery pack terminals, to accomplish exactly what you are looking for.

Nancy asks…

Looking for Solar Home system details and estimation…?

Living in Chennai, India… Thinking to install alternative solar power system for my home to reduce the state EB power consumption.. Pls.. through some lime light for the following..

1. System generating power need to support minimum requirement of a middle class home in city…
(Tubelight, Fan, A/C, Refrigerator….)

2. The system must be automatic for selecting both solar power and state EB power depends upon their availability.

3. Some good manufacturers in and around chennai..

4. Estimated cost..

Rgds,
Rathish.G

ssadmin answers:

For some planning ideas, and sizing, you can try http://www.builditsolar.com While the site is US oriented, much of the information is universal.

As a guess for size assuming a 5KW/2 Ton AC system, Likely you would be in the range of 6 Kilowatts for panels assuming minimal battery charging. If the AC runs all night as well, 10 Kilowatts of panels would not be out of line. But you would need probably 20 to 30 batteries as well.

As for the switching capability, a simple transfer switch system is avaialable in the US from several manufacturers for US standard power of 120 VAC @ 60Hertz, I an sure Philips or Siemens make them too for European standard 250 VAC @ 50Hertz.

Cost estimates are going to vary, and being in the US, what I could estimate for US prices would likely be way off from what you would find.

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