SKE UPS Battery Backup 1500VA/900W -SK1500 review

The SK1500 is a 1500VA / 900W rated battery backup from SKE Smart Key Energy. The benchmark for this review is a NAS, router and switch drawing roughly 100-150W. On the rating alone, 900W leaves a wide margin over that load. The harder questions are about topology, connectivity and mains compatibility, because the manufacturer leaves several of them unstated.

The manufacturer lists runtime at several loads: 3 hours at 40W, 90 minutes at 80W, 35 minutes at 180W, 22 minutes at 260W and 8 minutes at 360W. A 100-150W load sits between the 80W and 180W entries. The manufacturer doesn't list a figure for that range, so the exact time is unknown. The 8 minutes at 360W shows how quickly runtime shortens as load rises.

The battery is two 12V 9Ah lead-acid cells, giving 24V. The research doesn't say whether the battery is user-replaceable. The warranty covers the battery for one year and the machine for two.

Owner feedback points the same way on heavy loads. One related SKE model is reported to run for about 10 minutes under full load. A single source puts 16% of ratings as saying capacity was insufficient for them. With a 900W rating and a runtime table that falls away at higher draws, this unit suits a light, steady load more than a loaded desk or rack.

SKE doesn't state the topology. Third-party sources conflict, describing it as line-interactive, standby or offline. The only waveform detail comes from a third-party page for the related GP1500 model, which lists a simulated sine wave in battery mode. The same source gives a transfer time of 4-8ms typical and 13ms maximum. Those figures belong to a related model, not confirmed for the SK1500.

Because the topology is unconfirmed, and the simulated sine wave is listed only for the related GP1500 model, anyone with equipment that is sensitive to battery-mode waveform should check the SK1500's output with SKE or the seller. Owners do mention automatic voltage regulation, with an LCD that shows input voltage, output voltage and load. In battery mode the unit emits a beeping alarm every 6-10 seconds.

The manufacturer names an LCD, an alarm and UPS management software. It doesn't name a USB HID interface or a network port. That leaves no stated basis for automatic shutdown with Synology, QNAP, TrueNAS or NUT. SKE doesn't list it, which is different from saying it is absent. Anyone who plans to rely on a clean shutdown signal should confirm the connection with SKE or the seller first.

The sources disagree on outlets. The manufacturer's product page for the 3.0 version shows 8 outlets: 6 battery-backed with surge protection and 2 surge-only. The 2.0 variant shows 4 battery-backed and 4 surge-only. Check which version is being sold before counting sockets. The research doesn't state the socket type.

Voltage needs the same care. The Amazon UK listing gives the input as 230V, while the manufacturer states 110/120Vac. These two statements can't both be right for a UK buyer, so confirm the rating on the exact unit before connecting anything to it.

Owners praise the automatic voltage regulation and the LCD readout. They also mention a lower price than APC and a durable build, with 89% liking it in an aggregator figure that is unverified. On the negative side, a tail of ratings from a single source reports reliability problems. The short runtime under full load and the capacity complaints appear too.

The SK1500 offers a large rated output and a helpful display, and the runtime table gives useful guidance at light loads. It leaves too much unstated for a buyer who wants an automated shutdown setup. Topology, USB connectivity, socket type and input voltage all need checking. For a small, light network stack where those points can be confirmed, it is a reasonable candidate. Without that confirmation, the gaps outweigh the headline wattage.