Sujet : Re: Backup power supply
De : tnp (at) *nospam* invalid.invalid (The Natural Philosopher)
Groupes : comp.sys.raspberry-piDate : 14. Mar 2024, 10:17:21
Autres entêtes
Organisation : A little, after lunch
Message-ID : <usufb1$1h4j9$1@dont-email.me>
References : 1 2 3
User-Agent : Mozilla Thunderbird
On 14/03/2024 07:57, Andriy D wrote:
This is exactly my concern - I want this think up&running 24/7/365 and I don't want
it to burn my house down 🙂
I guess this is where you'd say 'risk' and 'price' are in a inverse relationship 😉
--
It is entirely possible to trickle charge a lithium cell at uber low risk, Essentially you want to current limit the supply at at one tenth of the hourly capacity so e,g a 2200mAh celll would need to be charged at no more than 220mA, and voltage limit the charge at 4.2V.That will give you a cell which, off charge in UPS mode will slowly decay to an end point of around 3.5V.You will need a step up converter to deliver a sane 5V to the pi and some way to power it all down in case of battery going too low.That's probably a case for a Pi Pico.Or buy a unit that's already done it all :-)
-- Those who want slavery should have the grace to name it by its proper name. They must face the full meaning of that which they are advocating or condoning; the full, exact, specific meaning of collectivism, of its logical implications, of the principles upon which it is based, and of the ultimate consequences to which these principles will lead. They must face it, then decide whether this is what they want or not.Ayn Rand.
Backup power supply
Re: Backup power supply