Reference
Surge Protectors Are Not Backup Power
A surge protector turns one outlet into several and is supposed to absorb a voltage spike on the way through. Neither of those jobs has anything to do with keeping equipment running when the utility drops. It is worth owning one; it is worth knowing what it does not do.
It does nothing during an outage
A surge protector is a passive device sitting in the path between the wall and your equipment. When the wall goes dead, so does everything downstream of it, immediately and completely. There is no stored energy in a surge protector.
The reason it belongs in this sequence anyway is the other end of the outage. Power coming back is not always graceful, and equipment that survived the dark can meet a rough restoration. A protector is cheap insurance for that moment, and it also solves the practical problem of having one power station outlet and four things to plug in.
The joule number is a seller claim
Listings quote a joule rating, and this catalog reports those figures the same way: 2700 J, 2100 J, 1680 J, 1080 J, 1050 J, 900 J, as stated on each listing. The site has not measured any of them and does not treat the number as verified.
Treated as a rough ordering, higher is generally more absorption capacity. Treated as a precise comparison between brands it is not reliable, because the test conditions behind the figure are not standardized across sellers in any way you can check from a product page. Look instead for a safety certification mark on the listing, and for a protection indicator light that tells you the unit is still doing its job.
- Joule ratings on this site are reported as the listing states them, not as measurements.
- Absorption capacity is consumed over time. A protector that has taken hits is not the protector you bought, and its indicator light is the only cheap way to know.
- A certification mark from a recognized testing laboratory on the listing is worth more than a large joule number without one.
- No surge protector stops a direct lightning strike. Unplugging is the only thing that does.
Never chain them together
Plugging one power strip into another, or into an extension cord, or into a wall extender, is the single most common misuse of this product category. It defeats the protection circuitry, it hides how much load is actually sitting on one outlet, and it is a recognized fire cause.
One strip, plugged directly into a wall outlet. That is the whole rule.
Hard limits
- Do not plug a power strip or surge protector into another power strip, surge protector, extension cord, or outlet extender.
- Do not plug a wall outlet extender into a power strip, or a power strip into a wall outlet extender.
- Plug each strip directly into a wall receptacle, and never behind furniture where you cannot see it or feel the heat.
- Do not run a strip under a rug, through a doorway, or anywhere the cord gets pinched or walked on.
High-wattage appliances do not go on a strip
Anything that makes heat or moves air with a compressor pulls a large, sustained current, and a power strip is not the right thing between it and the wall. These belong in their own wall receptacle.
Hard limits
- Do not plug space heaters, air fryers, microwaves, air conditioners, toaster ovens, hot plates, or kettles into a power strip or extension cord.
- Do not plug a refrigerator or freezer into a power strip as a permanent arrangement.
- A strip that is warm to the touch, discolored, or smells of hot plastic goes out of service immediately.
- Do not exceed the strip's stated amperage or wattage rating, and count everything plugged into it, not just the big item.
On a power station outlet, the strip does not raise the ceiling
It is tempting to plug a strip into the AC outlet of a power station so that four things fit where there was one socket. That is acceptable for small loads, with one condition that people forget.
The strip has no idea what it is plugged into. It will happily pass more current than the power station can supply, and the inverter will fault or shut down. The limit is the power station's continuous rating, not the strip's. Add up what is on the strip and keep the total under what the unit states it can supply continuously, with room left over.
Hard limits
- Do not exceed the power station's stated continuous output by loading up a strip plugged into it. The strip does not enforce that limit.
- Do not put a heat-producing appliance on a strip on a power station. It was the wrong load on a wall outlet and it is a worse one here.
- Do not chain a strip to another strip on a power station outlet either. The rule does not change because the source is a battery.