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USB, DC & Solar Lipoly charger
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Please be positive and constructive with your questions and comments.

USB, DC & Solar Lipoly charger

by kje on Sat Apr 07, 2012 8:07 pm

I want to use this USB, DC & Solar Lipoly charger and charge things like smartphones. Do I have to use mintyboost as well, or can I do it without?
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Re: USB, DC & Solar Lipoly charger

by ransomhall on Sat Apr 07, 2012 8:29 pm

You need the mintyboost to step up and regulate the power available for a USB device (5V, 500mA). See this post: viewtopic.php?f=15&t=21942&p=119928&hilit=ransomhall#p119675

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Re: USB, DC & Solar Lipoly charger

by kje on Sat Apr 07, 2012 9:20 pm

So the mintyboost is a regulator? Why does it need step up? The solar panel have more voltage than 5v... Why don`t the battery connected to the Lipo charger need the regulator from mintyboost?

I have a 5 and 6 voltage regulator (LM7805/LM7806), can I use one of these instead of the mintyboost? (http://www.jayconsystems.com/product_detail.php?prod_id=74)
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Re: USB, DC & Solar Lipoly charger

by adafruit_support_bill on Sun Apr 08, 2012 6:30 am

You need the battery in the circuit because the power from the solar panel is not steady enough to charge a phone unless you have near-perfect conditions. The mintyboost is needed to get the battery voltage back up to the 5v expected by the phone.

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Re: USB, DC & Solar Lipoly charger

by kje on Sun Apr 08, 2012 4:18 pm

adafruit_support wrote:You need the battery in the circuit because the power from the solar panel is not steady enough to charge a phone unless you have near-perfect conditions.


So the solar panel are charging the battery, and the battery are charging the phone?

adafruit_support wrote:The mintyboost is needed to get the battery voltage back up to the 5v expected by the phone.


But the battery have 5v, hasn`t it?

Is there a voltage regulator in the Lipo charger?

How can I make it automatically stop charging when the lipo battery reach full charge and protect it from overcharging?
kje
 
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Re: USB, DC & Solar Lipoly charger

by adafruit_support_bill on Sun Apr 08, 2012 6:25 pm

So the solar panel are charging the battery, and the battery are charging the phone?

Yes.
But the battery have 5v, hasn`t it?

No. LiPo's are 3.7v.
Is there a voltage regulator in the Lipo charger?

There is a charge regulation circuit. It monitors the charge on the LiPo battery and regulates the output voltage accordingly.

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Re: USB, DC & Solar Lipoly charger

by kje on Sun Apr 08, 2012 9:50 pm

Thank you. :) Does it automatically stop charging when the lipo battery reach full charge?

Can I use this one http://www.adafruit.com/products/280 with a 9v solar panel I have? Or will it be more efficient with a 6v solar panel?

What`s the difference on these two batteries?
1) http://www.chinabuye.com/ultrafire-ax-18650-3800mah-3-7v-rechargeable-lithium-battery-gray-2-battery-pack

2) http://www.adafruit.com/products/328

Do I get longer power with the first one?
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Re: USB, DC & Solar Lipoly charger

by adafruit_support_bill on Mon Apr 09, 2012 6:02 am

Yes, all our chargers stop when the battery is fully charged. The USB/DC Lithium Polymer battery charger will handle any input up to 12v.

If you believe the specs, those 18650 cells should last about 30% longer. But there is no mention of protection circuitry. All the cells in our store have protection circuits to prevent damage to the cell from over-discharge.

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Re: USB, DC & Solar Lipoly charger

by kje on Mon Apr 09, 2012 8:07 pm

If I buy the USB/DC Lithium Polymer battery charger 5-12V, I want to change mA by soldering in a through-hole resistor on. Can I buy this resistor?

Should I solder in a 10K thermistor? Can I buy this as well?
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Re: USB, DC & Solar Lipoly charger

by adafruit on Mon Apr 09, 2012 8:28 pm

we do not sell resistors
we do sell 10K thermistors. see the tutorial on how to use our 10K thermistor

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Re: USB, DC & Solar Lipoly charger

by kje on Mon Apr 09, 2012 11:49 pm

Thanks for all help! :D I ordered one USB/DC Lithium Polymer battery charger 5-12V now. Is it important with the 10K thermistor?

Where can I buy a through-hole resistor?
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Re: USB, DC & Solar Lipoly charger

by adafruit_support_bill on Tue Apr 10, 2012 5:55 am

A thermistor is not required when using the charger as shipped. The default charge rate is very safe. A Thermistor is recommended to protect against battery overheating when charging at higher rates. http://ladyada.net/learn/lipoly/index.html

Through-hole resistors are available at RadioShack.

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Re: USB, DC & Solar Lipoly charger

by kje on Tue Apr 10, 2012 2:01 pm

Thank you, I`m looking forward to the Lithium Polymer battery charger. :D I have this: http://www.ebay.com/itm/220648409360?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649 do you think it can do the same work as "mintyboost"?
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Re: USB, DC & Solar Lipoly charger

by kje on Mon Apr 30, 2012 4:28 pm

What is the difference on the "battery in" and "battery out" on the USB, DC & Solar Lipoly charger?

I put my solar panel into the DC connection, but where should I connect the battery I want to charge? Is there a tutorial on this?
kje
 
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Re: USB, DC & Solar Lipoly charger

by kje on Mon Apr 30, 2012 4:29 pm

What is the difference on the "battery in" and "battery out" on the USB, DC & Solar Lipoly charger?

I put my solar panel into the DC connection, but where should I connect the battery I want to charge? Is there a tutorial on this?
kje
 
Posts: 18
Joined: Sat Apr 07, 2012 8:02 pm

Please be positive and constructive with your questions and comments.