Output voltage on 200150 boost converter drops as soon as I connect a load

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Blake Ward
February 28, 2021 at 10:04 pm

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#62036 Reply |

I have the DROK Numerical Control Regulator DC 8-60V to 10-120V 15A Boost Converter Model 200150 that I want to use to charge an 84v battery.

I’m using a pair of 60v LI batteries in parallel as the input. I’ve set the output to 84v and max of 5a using the controls and that setting seems be stored correctly. When I check the output with a multi-meter, it’s 84v as expected. However, when I connect the battery to be charged to the output, the output voltage drops from 84v to about 74v and of course, no charging occurs. I would have expected that the output voltage stays constant at the value set.

Is there something that I have mis-configured that would cause the output voltage to drop as soon as there’s a load on it, or is my boost converter faulty?

Drok
Keymaster

March 1, 2021 at 9:58 am

Post count: 2971

#62098 Reply |

Hello Blake Ward，

Could you please tell us wheter it is in constant current now?

Constant voltage and constant current can’t work in the meantime. When current regulator is enable, voltage regulator compoent is disable. Only one mode is enable each time. In general, we charge battery in constant current mode firstly, when battery voltage reaches preset charing voltage, it will enter constant voltage mode.

For any more questins, please let us know.

Best regards.

Blake Ward
March 2, 2021 at 4:25 am

Post count: 0

#62181 Reply |

I didn’t even know there was a constant current mode. Can you tell me how I would be able to see that and what steps I should take to move it to constant voltage mode? Thanks!

Drok
Keymaster

March 2, 2021 at 7:37 am

Post count: 2971

#62205 Reply |

Hello Blake Ward，

Would you like to show us how it is by video?

When actual output current reaches the preset value, the CC indicator is on. Constant current mode is actually a current limit feature. Assume preset current is 2A, load will not draw more than 2A.

If you don’t want to limit load current, just increasse preset value.

Notice: For dead battery, charging current is high in the beginning, without current limit, it is easy to damage battery.

If you prefer constant voltage charging, please check if it is appropriate method for your battery.

Best regards.
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