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KONNER-SOHNEN
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The KS 48DC-S CO direct-current generator from the German brand Könner & Söhnen® is designed as a backup battery charger for charging 48-54 V batteries. The generator is ideal for charging batteries used to power private households, off-grid, solar, wind, telecommunication systems, boats, campsites, etc.
The Könner & Söhnen DC battery charging voltage range should match the battery rating. With the integrated controller, the generator constantly monitors the battery voltage in AUTO mode and automatically starts charging the battery when its voltage drops to 48 V or lower. The Könner & Söhnen generator has a response time of only 5 seconds. When the battery voltage reaches 53.5-54 V or a charging current of 20 A, the generator shuts down within 30 seconds. In addition to the AUTO mode, the generator has an EXTERNAL mode (or the so-called “dry contact”) for seasoned users, enabling the generator start to be controlled via an additional relay.
The KS 48DC-S CO direct-current generator is equipped with transport wheels and a carrying handle for easy handling, making it a much more versatile model. The battery can be charged in places where there is no mains power supply.
This extremely user-friendly Könner & Söhnen generator comes with exclusively designed soundproof housing and a minimum noise level (LpA 62 dB, 23 ft).
The reliable Könner & Söhnen engine meets all American quality standards. The Könner & Söhnen engine meets modern emission standards and has a reduced level of harmful substances in exhaust gases, which protects the environment and your health. The high-end alternator with copper winding and a powerful proprietary engine ensure trouble-free and long-term use.
Model KS 48DC-S CO has the following features:

I live off grid and have a 48v DC system with an inverter for 120AC. This gen works flawlessly. It will start when the batteries drop below 48v and stops at 54v. Really fuel efficient and quiet. I’m buying another for backup.