SRamakrishnan it is not stable for DC current especially for solar. measuring dc current in solar wire gives fluctuating results

SRamakrishnan i used 15v AC transformer I got upto 34 volts.

SRamakrishnan you might need to adjust the trimpot by setting the voltmeter pot to 0 turn left fully and turn trimpot to set. ref voltage of 0

SRamakrishnan yes, 0-12v will give output of 15 to 17v

SRamakrishnan optional formeasurement. good to have multimeter

SRamakrishnan depends on your country courier

SRamakrishnan no

SRamakrishnan should be 1 year but you can contact banggood. some manufacturers don't provide warranty for vendor purchase

SRamakrishnan whats is the input voltage. make sure it is 24v 3 to 5amp dc supply

SRamakrishnan it is to balance output to 0 when voltage is set to 0. post new build, just set the voltage and current to 0 and use voltmeter and keep the trimpot rolling until the output is 0

SRamakrishnan just use 12 0 12 or 0-24 AC transformer.. 12 0 12 worked forme. output is at 24v max and pot balanced and no load amp is 0. no red light

SRamakrishnan not sure. you can measure with scale

SRamakrishnan it is because of AC transformer winding. some transformers has few more winding and the AC input voltage will be slightly more which could give higher output voltages. no need to worry. 27 is normal. if you still want 30 or more voltage, you can I create the main filter capacitor or change transfer . you can use 15 -0-15, which gives you 34 voltage

SRamakrishnan ok. 0 -24v is good. not 24 -0-24v