March 21, 201610 yr I'm giving my old unraid server to my cousin. He lives in area with unstable electricity current. (rural area) sometimes voltage can drop 20-30v (often during heavy rain + wind) for few seconds then back to normal How to select/pick decent UPS to protect the server ? or any UPS with AVR will do ?
March 21, 201610 yr I'm giving my old unraid server to my cousin. He lives in area with unstable electricity current. (rural area) sometimes voltage can drop 20-30v (often during heavy rain + wind) for few seconds then back to normal How to select/pick decent UPS to protect the server ? or any UPS with AVR will do ? As I understand it the AVR capability stabilises the AC signal and maintains a safe voltage so in theory I imagine this would be enough to deal with the situation you describe. Generally this function allows the UPS to maintain safe power levels for the connected equipment without resorting to battery power. AFAIK though AVR has two components to it, Boost and Trim. With Boost AVR the UPS is able to compensate for a low voltage condition. With Trim AVR the UPS will be able to compensate for a high voltage condition. Be mindful that some cheaper units will only have Boost AVR. A UPS with both AVR Boost and AVR Trim is usually advised. Be sure to check, as they can be / usually are specified separately. For instance, the statement "AVR supported" or similar would not be enough for me. Into the specification sheet I would go.
March 21, 201610 yr ... He lives in area with unstable electricity current. (rural area) sometimes voltage can drop 20-30v (often during heavy rain + wind) for few seconds then back to normal .... WOW! Is this a 120v or a 220v supply that we are talking about? In either case, I would be looking at an UPS that has a rating of at least twice the excepted power requirement of the server. This reasoning is simple. You want to be sure that the battery has enough reserve to be able to handle several brownouts in a short period of time and then a complete server shutdown in case of a complete power cut. Remember that the charging time for the battery is 10++ hours and the maximum run time for most UPS's at full load is less than 10 minutes! Be sure that you get the manual from the manufacturer's website and study it. Many of the cheaper UPS's use the same battery for several units in the same product series. The difference is the beefed-up electronics for the increased capacity and a decrease in run time at maximum load. These type of units have approximately the same run time at a fixed load.
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