SUPERNIGHT DC 12V Step Up to 24V Boost Converter 72W DC Voltage Regulator Power Converter Waterproof Module Transformer for Golf Cart Club Car

Golf cart super

I'm reviewing the 12V -> 19V 5a converterI have a bench power supply and a load tester to test it out.My final use case is powering a portable mini-projector (which has a laughable "up to 2 hours" internal battery, which in reality doesn't last through a 1.5 hour movie) from some 12v batteries. The projector uses about 60w when charging/running.The bad:I wish this had a voltage range input. The 12v batteries can be anywhere between 11v - 14v. That's probably OK ... but who knows? A spec would be nice.Apparently their "smart chip" doesn't prevent low output voltage if the input can't handle the load. I limited the power supply current to see what would happen -- rather than shutting down, the converter just put out lower and lower voltage (and made a buzzing noise as it tried to keep up). In reality, this is probably fine. The sources I plan on using will have no problems with my 60w use case.The decent:Voltage output was 19.2v with no load, but dropped to about 18.3v with any load applied. It would be nicer if it kept the output to 19v.The good:Measured efficiency was between 92% - 96%. Nice to see it can at least reach the advertised numbers, and 96% is a great result!I didn't measure output ripple, but the output stayed pretty consistent across the range I tested: input (11v - 14v) and load (0.5a - 4a). The load tester I have isn't designed to test ripple, and I didn't really try. Eyeballing the voltage meter looked like the ripple might be fairly high (maybe 0.3v) -- but that's a terrible way to measure ripple.

I didn't actually trust it would convert the entire range of 8V-40V to 13.8V. I hooked it up to a benchtop power supply, and to my surprise it actually functions as advertised. It boosts a low voltage up to 13.8V, and drops a high voltage down to 13.8V. It's not EXACTLY on 13.8V across the entire range, but it only varies by about 0.2V at most. My power supply can only go up to 32V, but I would presume it works all the way up to the advertised 40V. I don't have a way to apply a 10A load, but it handles a 4A load without issue.

I have a golf cart with six 8 volt batteries for 48 volts. The previous owner installed lights and tapped into the first two batteries, 16 volts for 12 volt lights, instead of installing a buck. After burning through 4 batteries I discovered this "workaround", causing uneven battery drain and over charging. This resulted in the first two batteries going bad over the coarse of a year, two years in a row. I installed this buck to step down the 48 volts to 12 volts resulting in even battery drain. My batteries now all test the same after the first year, which will save me a lot of money in not having to replace batteries every year. Paid for itself in one season.

Bought 3 of these for ebikes and scooter. 2 of the 36v to 12v stopped working in less than a couple weeks of light usage. Only used like 30-50watt to them hooked to 36v 12.5ah ebike battery. Still have the 48v to 12v still working so far, will see how long that last. Please note even though 48v to 12v advertises 40-60v range, will also work fine at 12v, 24v or 36v as well with no issues.