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Uninterruptible power supply (UPS / inverter) kit for heating systems with a 12 V 30 Ah battery – a reliable solution for any heating boiler and heating system. The kit protects boiler electronics and the circulation pump from voltage fluctuations and surges that may cause electronic damage, and ensures continuous operation of the heating system during power outages. It is a practical and silent alternative to a generator. The inverter is designed for loads up to 500 W. In the event of a power failure, the device automatically switches to operating mode in less than 0.01 seconds. The inverter generates 230 V AC pure sine wave power from any 12 V battery (up to 200 Ah). When mains power is restored, the battery is automatically recharged, and the entire system operates fully automatically without user intervention. Operating time (at 60–70 W load): – with a 20 Ah battery – up to ~2 hours – with a 100 Ah battery – up to ~10–12 hours