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Powerboost 1000c & Inductive Charging
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Powerboost 1000c & Inductive Charging

by gregpronko on Mon Apr 29, 2019 3:40 pm

I have a technical sales question. We are using a Powerboost 1000c to run a RPI device at 5volts. I am plugging in your 6600mAh battery pack to run the device and currently am charging it all with a powered USB connection to the 1000c. However we now want to enclose the whole device in a waterproof housing and use one of the two inductive chargers you sell. We currently have the 3.2volt version of the inductive charger. So my first question would be is this ok to use OR do I need to use the 5v version in my project given that its a RPi? Second question would be trying to figure out which pins I would wire the inductive charger into. Looking at the 1000c pinout page it is not clear where you would put the 5v wire from the inductor??? Would this go to USB pin? Or the BAT pin? Third Question would have to do with a deeper description of the difference between VS vs 5V out to the RPi.... which should I use to power the RPi? They both seem to work.

Thanks,

Greg

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Re: Powerboost 1000c & Inductive Charging

by adafruit_support_bill on Mon Apr 29, 2019 6:20 pm

Will the inductive charger be used on the input side or the output side of the PowerBoost? In any case, you would need the 5v version, since both the PowerBoost and the Pi require 5v.

Please note that the inductive chargers are only designed for 500mA max output. And, since it is only about 40% efficient, if using it on the output of the PowerBoost, the maximum continuous output would be more like 400mA.

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Re: Powerboost 1000c & Inductive Charging

by gregpronko on Mon Apr 29, 2019 7:06 pm

Thanks for the info on this. We will order a 5v version. As for where we are using the inductive coils I should have been more clear. I would like to first create a base charging station that uses a 12v wall wort with the powered coil in the base station. (That base station would be like the base of an electric tooth brush stand.) Then the RPi will be inside a waterproof tube along with the other coil, the battery and the 1000c. The red and black wires from that coil would then need to go into the 1000c in a way that it is providing power to charge the battery. It will not be required to run the RPi but just charge the battery. We would only operate the device once lifted from the base station. Although if we figure out that our system can also run at 400mA then we would like it to do both.... trickle charge the battery as well as run the RPi. BUt the bare requirement is to just trickle charge the battery much like you would a toothbrush. Pick it up to turn it on and brush your teeth, otherwise it is off and trickle charging.

Based on that information can you tell me what pin I would solder the Red wire to from the Induction coil to the 1000c.

Thanks so much,

Greg

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Re: Powerboost 1000c & Inductive Charging

by adafruit_support_bill on Mon Apr 29, 2019 7:11 pm

That sounds like a workable configuration. You can solder the red wire from the inductive charger to the USB pin which is the input power to the PowerBoost.

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