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mobile battery for pi and monitor help

Former Member over 11 years ago

i been working on my own mobile pi. i got the pi side of things done but i have 2 problems left. 1st one is the poweing the monitor.

Amazon.com : 7 Inch Tft Color Lcd Car Rear View Camera Monitor Support Rotating The Screen And 2 Av Inputs : Vehicle Ove…

i been told it can runs 12V 500mA, the battery i want is Tenergy Li-Ion 18650 11.1V 7800mAh. i also like to have a solar charger for it

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Former Member over 11 years ago

ok let see if i understand, its easyer to step down so if i went 11.1v battery to a 14.8 and use a step down that would be better? cuase how i read it is that if i use a step-down 12v its would have a dropoff at 13volt wear a step up/down could use a wider range voltage and has a dropoff at 2.9volts?
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Robert Peter Oakes over 11 years ago in reply to Former Member

there is a mode of regulator called a buck/boost that automatically will switch from one to the other

look at the booster pack for the TI launch pad as an example, very few components involved.

You can also simply chain a boost then a buck one after the other, it will still be close to 80% efficient and there cheap to buy from Ebay

see this as an example.. problem solved DC 4 5 32V to 1 25 32V Auto Step Up Down Adjustable Converter Voltage Regulator | eBay

regards

peter
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Robert Peter Oakes over 11 years ago in reply to Former Member

there is a mode of regulator called a buck/boost that automatically will switch from one to the other

look at the booster pack for the TI launch pad as an example, very few components involved.

You can also simply chain a boost then a buck one after the other, it will still be close to 80% efficient and there cheap to buy from Ebay

see this as an example.. problem solved DC 4 5 32V to 1 25 32V Auto Step Up Down Adjustable Converter Voltage Regulator | eBay

regards

peter
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Former Member over 11 years ago in reply to Robert Peter Oakes

wow, so its auto adjustment to voltage needed?
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Robert Peter Oakes over 11 years ago in reply to Former Member

yup, the TI booster pack uses two of a similar chip for its Lipo Booster Pack I reviewed here http://www.element14.com/community/roadTestReviews/1712
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