You’ll need to know how much power (in Watts) your UPS is delivering. Then you’ll need to know how many battery blocks and of what Ampere Hour capacity are in your UPS. Contact online >>
You’ll need to know how much power (in Watts) your UPS is delivering. Then you’ll need to know how many battery blocks and of what Ampere Hour capacity are in your UPS.
This calculator is based upon 12V blocks only and will only accept integer values. So, if you have one single 6V battery of 12Ah capacity, then you’ll need to say it’s a 12V 6Ah battery. If the spec of your battery is not in Ampere Hours but Watt Hours, then as a very rough guide divide the Wh rating by 4 to get the Ah. If you have 7.2Ah or 8.5Ah then if you round down this will give you a minimum, and round up will give you a maximum.
Note, the calculator is approximate. There are assumptions made on standby current consumption and inverter efficiency that will be different for different UPS and also different at different load levels. Please just use as a guide.
If your load varies over time, you’ll need to estimate the average power consumption. You’ll need to size a UPS to meet the maximum power draw expected, but calculate the runtime based upon the average power consumption.
If you like, I have a very old ex demo 300W sine wave inverter your club is welcome to. I’d attach two 12V 100Ah batteries in parallel to this and that will run the lights for over 6 hours. Higher capacity give you the benefit of increasing battery life by not discharging to end of discharge points (you get more cyclic life this way). You will need, however to have a separate system to recharge the batteries. If you give us a call or ping us an email and let us know when you can pop by I’ll make sure it is available for you to collect.
a battery pack comprising a +/-120V strings with 36Ah capacity did the job exactly with a calculated 102 mins of runtime. There’s the solution, now where’s it going to
Best ups calculator when you just need a tool to quickly estimate the runtime. You don’t need to fill out a wall of forms like on other sites. Thank you very much.
Well, the problem here is the UPS is rated at only 260W, so if your total load is 550W then this UPS isn’t powerful enough and will overload. Note though that the computer power supply rating is not an indicator of how much power the computer actually takes, but rather how much power the PSU can deliver. The UPS itself contains a 12V 2.9Ah battery. This is quite tiny and I wouldn’t expect the UPS to provide more than 1 – 2minutes at its full load rating.
This post was done in partnership with Wirecutter. When readers choose to buy Wirecutter's independently chosen editorial picks, Wirecutter and Engadget may earn affiliate commission. Read the full guide to uninterruptible power supplies (UPS).
Most people don't need an uninterruptible power supply (UPS), but it can be a worthwhile investment to keep a few key electronics running when a power outage occurs. After spending more than 20 hours considering nearly 100 models, interviewing experts, and testing our top candidates, we found that the Tripp Lite AVR750U is the best UPS for people who want to power a home Wi-Fi network and other small electronics during a blackout of an hour or less.
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