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Well, it was pretty easy to test if I can do charge/discharge at the same time with this particular power pack. I'm sure different power packs have different characteristics. I just plugged the little power pack I had in to see what would happen. Initially, the power pack wasn't charged, and as a result the PI didn't start due to low voltage, or so I thought. I put it on charge for an hour and then plugged in the PI, and it appears that too much current is being drawn, the main voltage goes down to 2.9V and the PI still doesn't start. I tried another power pack with two batteries and the voltage only reached 4.6V. I suspect if a buck converter were introduced this problem could be resolved - clearly this little cheap power packs don't have this sort of thing.
So, I guess the take-away from this is that whatever is applied as a UPS needs to be capable of 2 amps or so at a steady 5V, even if it is for a short period. I still believe this may be the start of something that could work. While I know that others have done this with capacitors, I'm concerned that full shutdown might not be complete before the capacitors were fully discharged. This would be particularly an issue in my case, as I'm using an SSD for storage, which takes a good deal of current.
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You got me wrong. I'm not using an ne555. Besides I want to keep the power consumption as low as possible. I would safe a mosfet and a 50uF capacitor and get a micro controller instead. I don't see the benefit in that.
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I like to mention that Adam did make an update video. I follow his and his friends videos since a long time. So was not surprise I did ask him for a 3,0 Amp solution. I prefer for shutdown in the moment a solution with capacitors and the method of Spies the man with the swizz accent
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Can you please give us some details tocan. I know Andreas's video but I have some concerns regarding the super capacitor solution.
I hook up different stuff to my Pi and won't know which capacity to choose. What capacitors are you using?
Are there any problems regarding the balancing of the capacitors or are you using a single one?
How much current sucks the capacitor in the beginning? I'm concerned whether my power supply (2.2 A) can handle it.
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I did exact how Andreas did describe. And I bought the same. I like this super capacitors stuff in general. It's in parts useful if you run solar as well. For my 30 years old engel fridge what have 24 Volts I use up step converter and I support with super capacitors the start. Most knowledge was from Adam and from Iulian and I did start also with some stupid unpacking videos as you mentioned before. Super caps take what they need and get but raspi keep it. Did not got failure. But it's only for save shutdown. And supercool are wonderful to help starting a diesel engine. Here I did test with a small battery agb type 20 Ah but in general a 30 watt panel and a 6 pack 500 F super caps is enough to guaranty a smooth start. Can also be done with some Lipos. And if all runs dirty with batteries and solar in general you can start by hand with dynamo and a simple handweel...
Anyways with the diy power walls we do at the moment with raspi and influx and grafana a raspberry build. So also the epever will be included. And from China I got for inverters the modus protocol will soon be translate in next week's. And for final I will not care much failures of the raspi because plan b is the discussion of today to use in such case complete android as server. With opencpn I can not something back because of Kap files so I have to focus to pure tiles of openseamap or use navionics.
Just look how it works Julian did just did a postbag video with supercaps. They are to big for the raspi but Andreas did explain what is good to use. Read just the coments and look the postbag videos.
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Yes, I did misunderstand your setup for shutdown. The reason I was thinking that a microcontroller might be good is when I was thinking through the logic of when a clean shutdown might be required. For example, I might want my pi to ride through a momentary power loss of a few seconds, and then if the power loss persists, send a shutdown signal via GPIO. Also, it might be useful in extreme cases to have a power switch that would allow me to initiate a clean shutdown with a single momentary press, and a forced power off when the button is held for 10 seconds, like on a PC.
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