Hi,

I have ASUS UL30VT laptop. The text on the battery says 15V, 5600 mAh, 84Wh. The adapter (black box on the cord) is:
Output: 19 V DC, 3.42 A, 65W
Input100~240 V AC, 50/60 Hz universal

I went to ebay and found different solar panels but I am not sure which parameters I need to look for. For example this one

http://cgi.ebay.com/5W-18V-mono-solar-panel-car-12v-battery-laptop-charger-/120746170292

It has a number of specs. Will it work for my laptop? And if not, which parameters indicate that? If yes, how long will it approximately take to charge the battery?

Also I found several other ones

http://cgi.ebay.com/Portable-Solar-Power-Panel-Kit-40-W-Laptop-Batt-Charger-/170514447329

http://cgi.ebay.com/NEW-Solar-Panel-Battery-Charger-LAPTOP-19V-US-/390325758943

which are way more expensive than the first charger. Why is that? Is it because they seem to provide not only the charger but also the battery? Or is it because the panel is more powerful which leads to faster charge times? Will it work with my laptop?

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Looking for a solar panel volt stabilizer that does not require battery. A controller that will keep 12 volts regulated instead of 12v at times 17v or 21v….. Not looking for a battery regulator charger although if the device has the load option to be powered by solar and not just battery that would do.

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I have 4 20 watt Monocrystalline solar panels and 1 50 watt panel. Today before I installed the 50 watt solar panel I checked my voltage. I found that I get 173.9 volts and from the solar control it goes down to 27.6. My solar control is a PWM type. So how does this work. I was told that the batteries work best of they are charged at a slow rate but what about that loss of energy that is not used? Is it possible to connect a separate cable to use to charge the batteries and another one for powering up things? or should I invest in a MPPT solar controller?

This is my solar control.

http://hqrp.com/hqrp-12v-24v-10a-solar-charge-controller-regulator-10amp-with-battery-charger-monitor.html

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I have 4 20 watt Monocrystalline solar panels and 1 50 watt panel. Today before I installed the 50 watt solar panel I checked my voltage. I found that I get 173.9 volts and from the solar control it goes down to 27.6. My solar control is a PWM type. So how does this work. I was told that the batteries work best of they are charged at a slow rate but what about that loss of energy that is not used? Is it possible to connect a separate cable to use to charge the batteries and another one for powering up things? or should I invest in a MPPT solar controller?

This is my solar control.

http://hqrp.com/hqrp-12v-24v-10a-solar-charge-controller-regulator-10amp-with-battery-charger-monitor.html

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Here is what I have going on in my mind. I have a cabin in the woods that my friends and I stay at. It has no running water or electricity. I Have a large supply of LED’s that I just bought. The specs that I have received on them are as followed.((( Emitted Colour : White, Size: 5mm, Lens Color : Water Clear, Forward Voltage (V) : 3.2-3.4V, Current: 20MA, Luminous Intensity: 1300~1500mcd. What I am trying to figure out is how many LED’s i can use to run off of a 12 Volt car batt aprox 500 cranking amps. I need the light to run for about 8 hours before needing recharged. I have a Solar 12V charger to charge it during the day. The light will be used at night so it will have to run completely off of the battery. Also i would like the Formula that you used so that I can figure out more lights on my own. Thanks For the help,ya’ll.

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I’m making a solar trickle charger for a power pack of four AA batteries. I’ve got a 6v 250ma solar panel with a 5v voltage regulator,a rectifier diode to prevent back power to the panel and I’d like to add a charged LED to the circuit.

I’ve found this article to make a basic 12v http://www.reuk.co.uk/Make-a-Simple-Battery-Status-Monitor.htm
But cannot for the life of me understand the circuit design. I’m not sure what zener diode I should have or resistor. I just want an LED to light up when the power gets at or about 4.8v.

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I have a solar panel hooked up to a charger which is connected to a battery which is connected to an inverter which powers a R/O filter.

The solar panel produces 12v, the the battery is 12v and 12 amp hours, and the inverter is 400w and 24 volts dc to 120volts ac. The charge controller is 7amps.

I’m getting an overload error on the inverter. What’s going on here? What type of inverter do I need?

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Hi i am curious to know how and how long can i charge a 12 v batter on solar charger, and what is the voltage, amperage and power needed from solar cells to charge this battery as soon as it can.
thanx
adding some other details,
lets say i have a 12v and 60AH deep cycle battery, what is the solar battery charger i should buy so that i use it over night and charge it next day without harming the battery. i have seen some solar charger on ebay but they don’t seem so convenient to me (12v 1.5w charger).
thank you and i appreciate your help!

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I had a 5w inverter that I was using with my 5w solar panel to power some low-wattage devices. For example, charging my cellphone. And it’s been working just great without any problems.

Now I have a 50w solar panel and got myself a 100w inverter so I can power and charge some other devices, such as my razor. But here’s my problem. The panel works just fine with my 5w inverter, even on very cloudy days. The light is constantly lit and the cellphone charger works just fine, charging and powering my cell.

But when I connect the panel to the new inverter, the power light on the inverter is either out or blinking. Periodically it will be fully lit. So I’m having trouble getting the new inverter to power even a low-wattage device like my cell charger.

The over and under voltages for both inverters are exactly the same. But when I connect the panel to the lower inverter, it works perfectly all the time, bright and cloudy days. But when I connect it to the higher inverter, it’s barely working, even on very sunny days. So I"m trying to troubleshoot what is causing my problem.

I realize that it’s common to hook the panel to a battery and then the inverter. But since I only need it during the day, I’m connecting things directly between the panel and inverter. And I do realize the output will vary with weather conditions.

But I’m stumped as to why the panel is powering the 5w inverter no problem. But when I disconnect that inverter and connect the 100w one, it’s not working. My three guesses are that the 100w inverter needs a minimum current, however I have no idea what that would be. Or there’s something wrong with the inverter itself. Or the over voltage shutdown (15-16 vdc) is causing it. However, since both inverters have the same over and under voltage shutdowns, I doubt that would be the cause.

FYI, I did connect the new inverter to a 12v battery and it worked ok with the power light constantly on and devices working just fine. However, the inverter is having trouble working directly off the panel when the 5w inverter doesn’t have that trouble. So my best guess is that the larger inverter needs a higher level of current to actually power the device. But since there’s nothing to indicate this on the specs, I could be wrong.

So any help you can provide would be great! I still have time to return the new inverter, which is why I’m asking the question to you. Thanks.
I did use my multimeter to check the panel’s voltage and current. Voltage was anywhere between 16 to 20v. And the current ranged from about 120ma to 2.7A.

According to the specs on both inverters, input voltage = 11 to 15v. Over voltage shutdown = 15 to 16v. and Under voltage shutdown was 10 to 10.5v.

So my 1st thought was my panel’s voltage of over 16 was the cause. And that I may need to limit the voltage to 12 to 15.

But since the 5w inverter was working with the same panel voltage range and has the same specs, except for the no load current, I began to think this wasn’t the problem.

The specs don’t say anything about min current. Just min input voltage. So that’s why I wasn’t sure if it was the voltage and/or the current causing my problem.

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I tied in a few of my devices that run on 12v into my solar panel batteries and can get as much as 10 hours of free power a day off my solar panels. In the night I have a backup DC charger that kicks on automatically about 2-3 times an hour for about 20 seconds to keep my batteries charged. Will it make a difference on my electric bill each month?
I guess I’m not saving very much on my bill then LOL!

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