Könner & Söhnen KS 48V-DC DC generator

TheKönner & Söhnen KS 48V-DC is a specialised DC generator designed not for the standard power supply of domestic appliances, but specifically for charging battery systems as part of backup and off-grid power solutions. This model is well suited to systems based on 48 V batteries, where it is important to have a separate source of stable charging voltage to maintain equipment operation in the event of a mains power failure. :contentReference[oaicite:1]{index=1}

The generator operates in the 50–55 V DC range and has a rated power of 3.3 kW at a current of up to 60 A. This is why it is suitable for charging batteries with an operating voltage range of 50–55 V. The manual explicitly states that the generator is recommended, in particular, for 51.2 V LiFePO4 batteries, as well as other batteries that can be charged within this range. :contentReference[oaicite:2]{index=2}

Unlike conventional AC generators, the KS 48V-DC is specifically designed as a backup charger for battery systems. The document states that it operates according to the IUo charging characteristic: it initially charges the battery with a constant current of 60–63 A until an output voltage of 54.5–55 V is reached, and then switches to constant output voltage mode. If the charging current is initially lower than 60 A, the generator operates immediately at 54.5–55 V. This operating principle makes it particularly suitable for integration into energy storage systems. :contentReference[oaicite:3]{index=3}

One of the model’s key advantages is its multiple start-up and control modes. The generator supports manual, automatic and external start-up. In automatic mode, it independently monitors the battery voltage and starts up when it drops to approximately 49.5–50 V. Once charged to 54.5–55 V and the current drops below 20 A, the generator switches off automatically. In EXTERNAL CONTROL mode, start-up and shutdown are controlled via external dry contacts, allowing the generator to be flexibly integrated into various backup power systems. :contentReference[oaicite:4]{index=4}

It is precisely the external control mode that significantly expands the scope of application for this model. The manual specifically states that numerous devices — inverters, uninterruptible power supplies, batteries with BMS controllers, voltage control relays and other systems — can use potential-free dry contacts to control the generator. This makes the KS 48V-DC a highly practical solution for building well-designed backup systems, where the generator must be started not manually, but in accordance with the operational logic of the entire power system. :contentReference[oaicite:5]{index=5}

The model is equipped with a convenient control panel featuring voltage, overload and oil level indicators, as well as a voltmeter and ammeter. This allows for visual monitoring of the generator’s key operating parameters and the condition of the connected battery. The manual also states that the green power indicator lights up or flashes depending on the current draw, and the red overload indicator may briefly illuminate after start-up; this is not a sign of a fault. :contentReference[oaicite:6]{index=6}

Another important advantage is the protection of the engine and the system. The generator has a low oil level indicator; when this is triggered, the engine stops, helping to prevent serious damage. The model also features overload protection. Separate terminals are used for the positive and negative wires to connect the battery, and the cable from the generator to the battery must, according to the instructions, be protected by an 80–100 A fuse. :contentReference[oaicite:7]{index=7}

The KS 48V-DC is equipped with a KS 240 4-stroke petrol engine with a displacement of 223 cm³ and a power output of 7.5 hp. The fuel tank capacity is 12.5 litres, and the stated running time at 50% load is up to 7 hours. The oil sump capacity is 0.6 litres. It is recommended to use unleaded petrol with an octane rating of 90–95, containing no more than 10% ethanol, as well as SAE 10W-30 or SAE 10W-40 engine oil. :contentReference[oaicite:8]{index=8}

Despite its specialised purpose, the model remains practical for everyday use. It features a carrying handle and wheels, and its dimensions are 665×435×450 mm with a weight of 36.5 kg. This makes it relatively easy to move the generator around a site or use it as a mobile backup power unit where access to a mains supply is limited. :contentReference[oaicite:9]{index=9}

TheKönner & Söhnen KS 48V-DC is a truly specialised solution for those who use 48 V battery systems and are looking not for a standard petrol generator, but specifically for a DC generator with operating logic designed for convenient battery charging, automatic start-up and integration into modern backup power systems. :contentReference[oaicite:10]{index=10}