Articles tagged sizing guide
Related backup power guides grouped under this topic.
How Long Will a UPS Run? Runtime by Load, Not VA
UPS runtime can range from minutes to hours depending on the load. Use measured watts and the exact model's runtime curve, not its VA label.
What Size UPS Do I Need for a Router and Modem?
A 1500VA UPS holds about 170Wh, which runs a router and modem for roughly 3 hours, not 12. The VA rating sets the load a UPS can carry, never how long it lasts.
Will a 1000W Inverter Power a Fridge?
A 1000W inverter can power many fridges, but only if its surge rating can handle the compressor startup spike.
Can a UPS Run a Gaming Laptop?
Yes, and more easily than a desktop gaming PC. Size by output watts first, then verify runtime on the exact UPS model's load curve.
Can a UPS Run a Gaming PC?
A UPS can run a gaming PC if its watt output clears the measured load. See what a 600W PC needs, real runtime examples, and how to size it.
Can a UPS Run an Office Laptop?
Yes. An office laptop is a light UPS load, but runtime must come from the exact model's load curve rather than its VA rating.
How Long Will a 1000Wh Power Station Run a Fridge?
A 1000Wh power station can run a typical fridge for 8 to 16 hours. Here's how to estimate runtime for your specific setup, with real-world scenarios and calculator links.
How Our Calculator Picks Your Recommendation
A transparent look at the exact steps PowerLasts uses to size your backup power, so you can trust the recommendation or double-check the maths yourself.
A Bigger Battery Isn't Always Better
Oversizing your backup power wastes money, adds weight, and can even cause problems. Here's how to find the sweet spot.
How Long Will a Power Station Last?
Learn how to calculate portable power station runtime based on capacity, device wattage, and real-world efficiency losses.
How to Size a Power Station for Camping
Figure out exactly what size portable power station you need for car camping, from phone charging to running a mini fridge.
What Size UPS Do I Need for a Home Office?
Size a home-office UPS from measured watts, 20 to 25% output headroom and the exact runtime curve. Includes laptop, desktop and network examples.
What Is Startup Surge? Why Your Power Station Needs Extra Watts
Some devices need a burst of extra power to start up. Here's what startup surge means, which devices have it, and why it matters for backup power sizing.