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INDI Library v1.7.9 Released (23 Jun 2019)

INDI Library v1.7.9 is mostly a maintenance release to fix a few bugs in several drivers.

Powering the Raspberry Pi

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Powering the Raspberry Pi was created by kamisan

I am sure the topic of RPi power has been exhausted but I just discovered a new warning/something-to-gripe-about:

Recently I purchased a 12V battery power distribution panel from a reputable firm. The panel has the usual 12V fused PowerPole connector outputs. Also it has two 5V regulated USB-A outputs. How nice is that? Now I can power my two Raspberry Pi's. I tested the no-load voltage out of one of the ports and it was a cool 5.02V. Wow, I thought, they must be using one helluva good regulator. Well, it turned out that the stinking thing drops to 4.6V at 0.5A load. The Pi will actually complain about under-voltage when you hook up a monitor. I didn't do that. I ran it headless. After just a couple nights of imaging the VAP dropped out. I tried a proper PSU to no avail. I tired re-flashing the SD card -- nope.

I recommend getting something like a "Charge Doctor" from Adafruit:
www.adafruit.com/product/1852

Test your power supply before harming your Pi. Under no load it should read 5.2V +/- 0.05V. If it doesn't then keep it away from your Pi.
1 month 1 week ago #39203

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Replied by AstroNerd on topic Powering the Raspberry Pi

I use one of these 12v to 5v regulators, connected to my Pegasus Ultimate power hub, works like a charm...
Stellarmate OS on Raspberry pi3b+ controlled with Kubuntu laptop
Skywatcher EQ8 pro
Meade series 5000 80mm triplet Apo & Meade 8” SCT (de-forked)
Starlight Xpress SXVR H18, SXVR M25c, Lodestar Guide Camera
Pegasus Ultimate Hub for all USB & Power
Pegasus focus motors on both scopes
1 month 1 week ago #39218
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Replied by kamisan on topic Powering the Raspberry Pi

Yes, got two of those but was hoping that West Mountain Radio of Waukesha, WI could do equally well -- apparently not. No word yet on how they are going to remedy the problem.
1 month 1 week ago #39220

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Replied by Highkamp on topic Powering the Raspberry Pi

Kamisan, I recall reading a post about someone powering their two Rpi with Li battery pack. Was that you and if so which ones do you use?

Thanks
1 month 5 days ago #39287

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Replied by kamisan on topic Powering the Raspberry Pi

Highkamp, it wasn't me but it seems easy to do. You need a buck converter, like this one I use:
www.adafruit.com/product/1385
and a 11.1V 5000mAh LIPO battery. Off the top of my head you should be able to get 2.5 hours out of a full charge assuming you draw down to 50% then stop, the Pi + USB devices draw 2A continuously, and the efficiency of the converter is 90%.
The challenge is what to do about the real energy hogs: dew heaters and TEC coolers. I use two 12V 35Ah deep-cycle batteries. They are light weight and won't break your back carrying around. I can go 6 hours powering a cooled camera, two Pi's, a RA stepper motor running continuously, dew heater, Flip Flat, Filter Wheel, and a 12V-to-19V boost converter to charge the laptop.
1 month 5 days ago #39290

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