Question 1

How well will this power a raspberry pi 3?

Accepted Answer

This is not the best choice for raspberry pi 3. Raspberry pi 3 requires 5v. This regulator is intended to boost input voltage. For example you can input 12v and output 24v. A better solution for raspi 3 if you need a regulator for say battery operation the use a step down that is set for 5v output. If you are not using a battery and are using AC wall outlet then a standard wall wart that supplies USB power works great. USB power is 5v.

Question 2

I would like to use this for a project with a 0-30v input and a 5v, 2a output. is there a way to set the current? potential problems w/ the values?

Accepted Answer

If you look carefully at the image of the circuit board, you can see the two adjustable pots. The tall rectangular one adjusts the output voltage while the short square one is the current controlling one. My objection to this device is the current control pot. With less than one turn of the screw, you cover the entire range of control. Other similar boards have ten turn pots for both controls. When I just checked, for a couple of bucks more, you can get an similar board with two ten turn pots and a display showing the output current and voltage.

Question 3

How do I make this a 12v flood battery trickle charger running from 12 Solar batteries?

Accepted Answer

solar panels? I use a charge controler not the boost/buck converters. They have built in regulation and charge control and can also boost low or buck high panel outputs.. There are 5 and 10 amp units available for reasonable cost. Also there are 25 to 50 amp units that cost much more.

Question 4

Can I connect these parallel

Accepted Answer

The general answer is NO because it's impossible to set the output voltage of two of these to exactly the same voltage. Even 0.001V difference will cause the one with the higher voltage to supply all of the current, up to it's maximum output. If the current draw lowers the output voltage, something it shouldn't do, then the second one will start supplying some of the power..

That said, there is a way to use two (or more) of them in parallel. The trick is to place an identical small value resistor in series with each of the outputs with the load connected to both resistors. Now, when more current is drawn from one power supply, the voltage drop across the series resistor for that supply will decrease the output voltage after the resistor allowing the output voltages to match. You'll also want to match the output voltages as closely as possible, measured before the resistors. I'd recommend using a meter with three digits after the decimal at the output voltage. I'd also recommend using 1% resistors, in the 0.01 to 0.1 ohm value range. Don't forget that you will need to get resistors with enough power dissipation to prevent them overheating. If your load presents a varying current draw, the series resistors will also cause a small variance in the device's supply voltage, measured at the device.

ASIN	B06XG2KPTS
Brand	DROK
Brand Name	DROK
Current Rating	3 Amps, 4 Amps
Customer Reviews	4.2 out of 5 stars 56 Reviews
Item Weight	0.32 Ounces
Manufacturer	DROK
Model	200234
Part Number	200234
Power Source	Battery Powered

DROK Buck Boost Converter, DC-DC Buck Boost Converter Voltage Step Up Down Regulator CC CV 5-30V to 0.5-30V Adjustable Power Supply Transformer Module

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