Why can't UPS units be connected in series?

Why Isn't UPS Series Connection Recommended? Let Me Break It Down.

From a power distribution perspective, each UPS is designed to handle its own dedicated load—like workers assigned to specific tasks. Connecting them in series is like forcing multiple people to do the same job, making fair workload distribution impossible. For example, if you daisy-chain two HiDear UPS units, one might end up running at full capacity while the other barely spins its fan. This not only wastes resources but also causes the overworked UPS to wear out prematurely, defeating the whole purpose.

Even worse, ‌if one UPS in the series fails‌—due to overheating, component damage, or any other issue—the problem can cascade down the line, potentially crashing the entire UPS system and leaving all connected devices unprotected.

So, what’s the solution if you need ‌more power‌ or ‌longer backup time‌? Simple: ‌Just get a single, higher-capacity UPS‌ with extended battery life. HiDear’s ‌lithium battery UPS systems‌ are a great choice—they offer ‌longer runtime‌ and ‌durable performance‌ without the risks of series connections.