I need a 5kW DC generator with -48v output.

The "undercharge" code on a Kipor KDE6700TA diesel generator typically indicates that the battery is not receiving enough charge from the generator's alternator. Here are some steps you can take to address the issue:

1. Check the battery: First, check the battery to make sure it is in good condition and fully charged. If the battery is old or damaged, it may not be able to hold a charge even if the alternator is working properly.
2. Check the alternator: Use a multimeter to check the alternator's output voltage. The alternator should be producing around 14 volts. If the voltage is lower than this, the alternator may be faulty and in need of repair or replacement.
3. Check the wiring: Make sure all wiring connections between the alternator, battery, and generator control unit are clean and tight. Loose or corroded connections can prevent the battery from receiving a full charge.
4. Check the voltage regulator: The voltage regulator is responsible for controlling the alternator's output voltage. If the regulator is faulty, it may be allowing too little voltage to reach the battery. Check the voltage regulator with a multimeter and replace it if necessary.
5. Check the fuses: Make sure all fuses in the generator's electrical system are in good condition and not blown. A blown fuse can prevent the alternator from charging the battery.

If you are not comfortable performing these steps yourself, it may be best to consult a professional technician to diagnose and repair the issue with your Kipor KDE6700TA diesel generator.

Question edited for clarity.
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Easy way is to phone their Service Department.

https://www.google.com/search?q=kde+kipor+6700ta+dip+switch+settings

Kipor KDE6700TA Diesel Generator - 5,5 kVA

https://www.kipor-power.eu > Diesel Generators

Strong power. All diesel generator sets are equipped with KIPOR four-stroke engines, also the Kipor KDE6700TA Diesel Generator. · Advanced alternator winding.

KDE 6700TA - Diesel Generator »

https://www.kiporuk.co.uk > kde-6700ta-400-64-67

A new AVR(Automatic Voltage Regulator)delivers non-fluctuating power. Powerful KM186FAGET diesel engine. Optional electric starter.

The DC output for battery charging is from the engine alternator and is completely independent from the generator inverter.

As this is an inverter unit the typical polarization techniques for standard generators will not apply.

The ouput indicator being lit means the inverter input output should be good. This further implies a circuit disconnect state at the outlets. Try pressing the overload reset switch to make sure it is not in an odd state.

You need to run these tests in the video to see the state of the alternator. How to test your Electricity Generator AVR Brushes and Alternator on... With this info we can assist you further. :)

The Generator Guru Team

Hello there.
I'm assuming that engine runs fine. if there's no power output then the AVR or carbon brushes are dead. remove the back cover of the alternator very carefully and look at the center to find the rotor rings and check if the plastic brush holder hasn't melt or heat deformed and make sure the brushes make good contact against the rotor rings. if everything's fine then the AVR is dead. The AVR is a crescent shaped plastic container similar to this one.
http://www.ebay.com/itm/Automatic-Voltage-Regulator-AVR-For-5KW-5-5KW-Single-Phase-Gasoline-Generator-/221461125389
replace it with any similar found on Ebay, just make sure that connectors and cables are similar in shape and number. Regards

Possible dirty contact or defective.

if it isn't an invertor then check the condition of the brushes if its an avr type, if not avr then capacitor may have failed

Around 75 volts DC

If you need further help, I’m available over the phone at https://www.6ya.com/expert/craig_3fa289bf857b1a3c

I would say, yes (given everything bolts up okay), but I wouldn't connect a full 5000-watt load to it.

you need an inverter generator. checkout the honda line.