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Results tagged with ups
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user 107170
15
votes
Are 6 volt fluctuations in a 120 volt home outlet harmful to equipment?
You are lucky to have variations that small.
Some variation in the grid voltage is inevitable because of how these things work. Wires have resistance, transformers are less than ideal, the load varies …
- 3,474
5
votes
Should a UPS be unplugged when working on the electrical circuit it is plugged in to?
Bad news are that the relays CAN stick and even if they are sane, a bug in the UPS firmware can engage them in a hard to predict moment. … If the UPS is one of those expensive full-conversion zero-switching time types that have a rectifier and an inverter at the input - the chance of it backfeeding something is minimal, comparable to the …
- 3,474
0
votes
Use a 24V LifePo battery in a UPS designed for lead acid batteries?
There are huge capacitors in the UPS, on the battery side. Be sure your BMS can handle them (hint: it is not trivial). Not sure of their exact value, but you will open the UPS anyway. … I have a similar setup in my motorhome (a rackmountable APC 1500VA + 8S 100Ah LiFePO4 battery), but I rarely use the charging mode of the UPS. The UPS is basically used as a foolproof inverter. …
- 3,474