LiPoly Charger and solar panel

Hi. I’m thinking of using it (SparkFun USB LiPoly Charger - Single Cell https://www.sparkfun.com/products/12711) as a solar charger/batterypack. The battery is LiPo 6000mAh / 3.7V

Can I connect a 8v 310mA solar panel via the 5v input?

Thanks.

You could, but as to whether it will work is another question. Solar Panels make very poor voltage sources, and that circuit is designed to run off a USB port. USB ports provide 5V regulated at up to 500 ma , and that circuit can charge at either 100 ma of 500 ma. Unless the Solar Panel is in very bright sunlight where the Solar intensity is close to 1000 W/ SQ M it wont produce enough power for the charging circuit to work properly.

"Can I connect a 8v 310mA solar panel via the 5v input? "

NO.

A solar panel voltage rating is not to be taken as absolute. That panel rated at 8Volts, can vary down to 0volts, and go up to around 14Volts. You need a regulator between the solar panel and the 5V input. It will keep it from over voltage, but will not help when the solar panel goes to 0v.

The Adafruit version of the MCP73831 LiPo charger is optimized for using a solar cell to charge a single cell, however the charger input voltage cannot be allowed to go above 6V.

I have one and it works well, using a couple of these much cheaper 6V panels in parallel.

Hi. Thanks for the replies.

javilez:
Hi. I’m thinking of using it (SparkFun USB LiPoly Charger - Single Cell SparkFun USB LiPoly Charger - Single Cell - PRT-12711 - SparkFun Electronics) as a solar charger/batterypack. The battery is LiPo 6000mAh / 3.7V

Can I connect a 8v 310mA solar panel via the 5v input?

Thanks.

Yes.

If you add a Buck-Boost Converter between the Solar Panel and your LiPo Charger.
Like this one …
http://www.ebay.com/itm/Practical-DC-DC-Boost-Buck-Step-Down-Up-Converter-XL6009-Solar-Voltage-Module-/251917672698?_trksid=p2141725.m3641.l6368
for $1.88 free Shipping.
Set the output to 5.0 Volts