Your questions about [solar power]

Robert Your questions about [solar power]

Robert asks…

What is a 45 WATT solar panel kit able to power?

kilowatts and watts. I look for the conversions and am unable to find them

Solarguy answers:

Not much. Might be just enough to charge a mobile phone.

For example my iphone charger is 240V and is capable of delivering 0.15A therefore 240Vx0.15A=36W
Of course in the US it would be 110Vx0.15A=16.5W

So yeah it would charge a mobile phone but thats about it.

Susan Your questions about [solar power]

Susan asks…

where can i find a solar kit to power a laptop 90 watt 19v 5 amp?

Solarguy answers:

that is a lot of power to expect a solar panel to supply!

you will need a large panel.

I would suggest eBay for the panels and batteries.

Then connect the PANELS to the battery and then regulate the output for the laptop. two 12V wired in series, then a 19v regulator.

Helen Your questions about [solar power]

Helen asks…

45 watt solar panel kit with a 300 watt power inverter? would this even run my toaster? thats 120v 60hrz 840w?

Solarguy answers:

The inverter is only designed to deliver 300 watts, so no.
There must be a battery in there, you didn’t mention it. If you work out the current that a suitable inverter would need to draw to drive a suitable inverter, and the battery is able to safely supply that current, you can cook your toast.
However you must then look at the solar panel, at 45 watts it will take some time to charge a suitable battery for the job. And it can only do this when there is sufficient sunlight. So the time it can charge at 45 watts is limited in a 24- hour cycle.
Ultimately, the 840 W for your toaster needs to be supplied from the 45 W panel.

Linda Your questions about [solar power]

Linda asks…

Does anyone know about solar power?

I really need to know what size battery I need to use with a 60 watt solar panel kit. Also how many batteries I will need. I will be using this kit with an old self contained camper. Thanks

Solarguy answers:

The 60 watts is probably overstated, but let’s assume it’s correct. At 12 volts, that’s 5 amps. Generally, we try to charge a lead-acid battery at 5% of capacity, or at least 3%. That means a 12 volt, 100 amp-hour battery.

You can find gel cells equivalent to this, or just use a single car battery (deep cycle marine battery is better).

John Your questions about [solar power]

John asks…

Solar Powered Air Conditioner? Is it enough power?

Here is a 100-Watt Solar Panel Kit ( ),
my MAIN QUESTION is, what does it mean to say that this is a 100 watt solar panel?
Does it mean that it can store 100 watts an hour/minute/second in a battery?
Can it store enough power into a battery to power a window A/C which requires 1900/1880 Watts to Condition Air?

Solarguy answers:

a 100 watt solar panel will make 100 watts for every second that it has perfect angle and sunlight. On the average, there are only 5 hours of equivalent perfect sunlight per day. That means your 100 watt panel will make 500 watt-hours or .5 kw-hrs per day.

Your AC needs 1900 watts per hour and say it runs 24 hours per day, that means it needs 45,600 watt hours or 45.6 kw-hours. You would need 45.6/.5 91.2 of them panels to make it work. In the summer you might need 70 and in the winter 110 of them. Plus you’d need batteries, lots of batteries so that the panels would make energy when the sun shines and return it when the sun goes down you’d need to store 45.6 kw-hr of energy. Thats about 4000 amp hours at 12 volts Large batteries are about 100 amp hours, so you’d need 40 batteries.

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