Soho notes conversion3/30/2023 While both fans have three wire connections, they differ in how they use the third (yellow) lead. Nonetheless, I am confident that it will suffice. As a result, it’s rated for 50.4 m³/h air flow vs 55 m³/h for the original fan. Spinning at 2000 RPM, it’s markedly slower than the original fan. It’s rated for 16.1 dB A noise level, which is much quieter. Rather than accept this disturbance in my otherwise blissfully silent home office, I ordered an 80mm Noctua Ultra Quiet fan to upgrade the UPS. The original fan, a 12 vdc model from Sanyo Denki, is rated for 24 dBA. As Karl Fife had warned me, the cooling fan made quite a roar. With the new battery pack installed I fired the unit up on my bench. So, for around $350 I have a proper, online UPS, new-to-me, for my network core. It was easier to buy the EBP-1605 Compatible Replacement Battery Pack via Amazon for $199. In truth, the devices requires three batteries that can be found for just $30 each!īut I needed the wiring harness, too. Given its age, even new-in-box, the original batteries would have been badly degraded. It was just $100 + shipping, without batteries. The one I thought a particular bargain is a 9130 2RU model rated for 1KVA. I found used Eaton 9xxx series available from electronics recyclers on E-bay. My Belkin is over around 14 years old, having seen seen several sets of batteries over the years. They are largely cosmetically different, their internals only slightly updated. So, Eaton replaced the old 9xxx series with the newer 9SX Series. I’m told this is because some of the parts used in its manufacture are no longer available. This device is technically new-in-box, unsold inventory, even though the 9130 is officially past end-of-life. Instead, I’ve opted to replace it with a new Eaton 9130 online UPS. This made me reconsider another round of batteries for the elderly Belkin UPS. Nor did our American Standard gas furnace. In the Great Texas Freeze of February 2021 I learned that our UPSs did not like generator power. Online UPSs are standard fare in data centers, but more costly than a typical home office dweller could justify. The load never sees any change in delivered power. When utility power fails the invertor keeps merrily chugging along using DC from the batteries. The switching is all done at the DC layer. The utility power is turned into DC, which feeds the batteries and the invertor, which makes brand new, pristine, stable AC power for the load. More sensitive gear is better served using a more sophisticated design known as “online” or “dual-conversion.” An online UPS puts its active circuitry between the utility power and the load. Any UPS under $500 new is almost certainly a line-interactive design. When utility power falters the local circuitry tries to make up the slack. In such a design the power provided by the batteries and invertor is connected in parallel to the utility power. However, as with most low-cost UPSs, it was “line-interactive” design. Being fanless, it was silent…which I deeply admire. It did the job, sustaining the network core through many a minor outage. Our reliance on power-over-ethernet means that there are actually quite a lot of gear that’s on the UPSs.įor many years the UPS in my office was made by Belkin. In both cases, they run the network core Ethernet switches, Wi-Fi access points, IoT hubs and the like. We have a pair of UPSs here one in the office and another in the house.
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