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I know I'm not the target market for their UPS addon, but is 91.00€ for a UPS board [1] that does not include the required lead-acid battery sound reasonable? I
by berbec 8y ago
I know I'm not the target market for their UPS addon, but is 91.00€ for a UPS board [1] that does not include the required lead-acid battery sound reasonable? I know they have gone through the certification process for everything, but doesn't this seem fairly high?
The battery is not lithium, but lead-acid. For an application using a Raspberry Pi, I generally assume size is a fairly major consideration. Considering a lead acid battery will need to be three times the size for similar charge capacity, doesn't this battery chemistry choice seem very strange?
A quick google brought me to the PiJuice HAT [2], a $54 piHAT, with an included 1820mAH LiPo. This device also doesn't massively increase the size of the Pi. PiJuice claims "~4 to 6 hours in constant use". Let us assume this is a vastly inflated figure designed by the marketing department. Isn't 2 hours run time more than enough for a UPS? If the power failure is longer, I want my UPS to allow me to safely shut down my gear.
1: https://www.sferalabs.cc/product/strato-pi-ups-board/ https://www.sferalabs.cc/product/strato-pi-ups-board/
2: https://ameridroid.com/products/pijuice-hat-1 https://ameridroid.com/products/pijuice-hat-1
- FullyFunctional 8y agoLiPo is a really terrible choice for a UPS; it'll wear out quite quickly. LiFo is way better, like this: https://www.crowdsupply.com/silicognition/lifepo4wered-pi-plus https://www.crowdsupply.com/silicognition/lifepo4wered-pi-pl...
- snovv_crash 8y agoLiFePO4 is also much more fire resistant due to punctures, shocks and overcharging, which is also good for an industrial setting.
- pavs 8y agoLitium battery backup and UPS is two different things.
- gsich 8y agoLead batteries are cheap.
- falcolas 8y agoAnd reliable, and they're OK with being cycled frequently. Their failure mode also doesn't include the words "chemical fire".
- snovv_crash 8y agoThey actually aren't good at being cycled if you go further than about 50% discharge, less than 10. Otherwise it gets 500 cycles. Lithium Ion also gets 500 cycles, but can go up to 2000 cycles if you stay between 10% and 90%.
- gsich 8y agoTrue. But you usually don't cycle UPS batteries that much. If you do you probably have bigger problems with your power supply. There are some cycle lead batteries though, sometimes called "solar batteries".