Thank you for the interest in our DC Generators and please feel free to use this forum with any questions you may have or, don't hesitate to contact us directly for your specific application. We look at each individual installation to recommend the best fit to match voltage, amps required and depth of discharge.
We do not have a single product for every application and our Diesel Battery Chargers have different features than the simple gasoline powered units. There is not any need for a charge controller for any of our units. They simply connect directly to the battery or, bank of batteries with the appropriate sized cable set. The alternators we have directly coupled to our engines (gas, diesel and soon to be released propane) are automotive type that are internally rectified and self regulating. We modify the regulators of our gasoline and propane powered units where we add the two features to control the DC energy of turning the power on/off and making the high/low voltage selection.
We can provide these simple features with a diesel powered Battery Charger, but typically they are provided with an under voltage relay and autostart function where in a 24 volt system where the UV set-point (configurable) is set at <26 volts. We set the runtime for one hour (configurable) where typically this is plenty of time to recharge the batteries to 85-90% of their capacity. The Charger constantly monitors the batteries voltage and if it needs to restart after this hour it will run for up to another hour. When the units are installed and a typical load is introduced, you can idle the diesel engine back to an RPM where to engine is working at its peak performance.
This is a simple procedure and easy to tell where the optimal RPM is by listening to the engine and feeling the vibration produced. It most instances, it is between 1800 and 2200 RPM. The 24 Volt Diesel unit produces 28.8 volts of straight DC energy and as the batteries absorb the power, the amps slowly drops to a trickle as the batteries become charged.
We offer our Duke Diesel Battery Chargers with various features including on-board fuel tanks, cold climate kits, mufflers, full enclosures, cyclone filtration as well as our popular Remote Monitoring System (RMS). The RMS adds the capability to monitor you DC Charger from anywhere you have an Internet connection.
We recommend utilizing our DC Chargers as backup for your primary charging systems whether it is solar, wind, thermal or hydro. Our units do not include "multi stage" charging for finish charging as we find this wastes fuel and takes a long time where the engines run with minimal loads. With the introduction of a backup DC battery charger you can size you primary charging system and battery bank to a more affordable size knowing you will always have a backup in times where the primary system can't keep up and/or, your DC loads are higher.