Agree, LFP is the way to go. I did that in many types of UPS, different models & capacity, such as EATON and APC, but many others as well. There are many suppliers, even in Amazon, Alibaba, Aliexpress, etc. that already have LFP cells that internally have the BMS and work in a transparent way to replace lead-acid, using same connectors and dimensions (but much lower weight). They are more expensive (3-4 times the price of the lead-acid ones), but they will last for 15-20 year, and they can be discharged up to 90% instead of 50%. They often provide a bit “extra" real power/capacity as well. Regards, Jordi @jordipalet
El 7 abr 2025, a las 8:30, Vasilenko Eduard via NANOG <nanog@lists.nanog.org> escribió:
lithium is a)expensive, b)dangerous (it could quickly burn your house), c)would be dead in 4 years. We're talking about stationery; it's not wearable, right? Then there are many LiFePO batteries on the market. Many propositions are with a special controller that emulates lead batteries for the respective voltage (it permits connecting it to the old staff). LiFePO is much-much better on a), b), c). But has bigger weight.
Probably, UPS in the future will be based only on LiFePO. Then additional controller to emulate lead batteries would not be needed. It is potentially possible to upgrade any UPS (makes sense for old lead batteries): 1) cut lead batteries (sell them to any battery store, it is not about money - such garbage must be recycled), 2)connect the LiFePO with a controller that emulates lead batteries for the respective voltage. Eduard -----Original Message----- From: TJ Trout via NANOG <nanog@lists.nanog.org> Sent: Monday, April 7, 2025 00:27 To: North American Network Operators Group <nanog@lists.nanog.org> Cc: TJ Trout <tj@pcguys.us> Subject: [NANOG] Re: Small Capacity UPS
5/12/24v lithium DC ups that powers all the devices
On Sun, Apr 6, 2025, 11:56 AM Mike Hammett via NANOG <nanog@lists.nanog.org> wrote:
I'm trying to find something that keeps my customer's network gear online for a meaningful amount of time. The challenge is that an ONT, firewall, switch, AP, and some IP phones doesn't add up to be very much load. Most normal UPSes get terribly inefficient at lower load ratings. Add up all of the network devices a customer may have and we rarely break 50 watts of load. Normal, small UPSes are lucky to break 50% efficiency at those loads whereas they may be 95% efficient at say 100 or 200 watts. Get a bigger unit with a bigger battery and now you're even less efficient. Get a big enough unit to have extendable batteries and now you're spending thousands of dollars for such a small request.
I've gone asking, but haven't really gotten anywhere. The best technical solution was from some electronics parts nerds that was basically to build my own small rectifier and battery system. Great. I can achieve high efficiencies with small loads, letting me have say 4 or 8 hours of battery. However, I've got a science project, not something I can deploy at a customer.
I'm hoping one of you has the magic bullet in what product a service provider should use in this scenario.
Oh, and of course, being able to centrally manage them from my own iron would be great too. :-)
----- Mike Hammett Intelligent Computing Solutions http://www.ics-il.com
Midwest-IX http://www.midwest-ix.com
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