Reddit reviews DIGITEN DC 12V LED Digital Thermometer -50-220F Fahrenheit Temperature + Temp Probe Red
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Ok let me start at the beginning.
I now own my RadRover eBike for almost 7 months. Great bike, I'm closing in at 4000km on it. The bike is great but comes standard with a 48v battery and while it's decent, it doesn't compare to the Luna Dolphin 52v I run through it mostly.
I bought my 52v dolphin pack from luna cycle, as well as the advance 300 watt charger, their top model.
I always leave all my chargers plugged in even when not charging. None of my chargers have a problem except this advance charger I bought from luna.
After just 4 weeks the LCD stopped working that gave out the voltage read out, I had it warrantied, they send me a new LCD. And the weird thing is they had me manually open up the charger and do the replacement myself, rather then sending in the unit for exchange.
4 Weeks later the same LCD blew. I kept using the charger for another 2 months, and then the charger stopped working all together. I contacted support again, and they told me that the chargers are not very durable and should not be moved around, I told them it was in the same spot in my garage but they refused to replace it. They send me a 2Amp 52v charger instead, ($35)
I got pretty fed up.
I went to youtube to look for other options and I came across this a video of a Swedish guy who build his own charger.
Components looked solid and I have my own printer so I can customize it so I thought why not.
The whole reason this and many other chargers like this are failing is due to poor cooling, they have a 1x1" fan to cool as 12" box thats loaded with crap, this is why I wanted to do my own design that would focus around cooling.
Here is what I ordered
$12 - 2 of Bgears b-Blaster 90mm 2 Ball Bearing High Speed Extreme Airflow Fan
getting returned * $45 - LETOUR Power Supply 12V 40A 500W AC 110V/220V Voltage Converter
$22 - DROK® Digital Multimeter DC 6.5-100V 20A Voltage Amperage Power Energy Meter
$45 - Yeeco Numerical Control DC DC Boost Voltage Converter, 6-60V to 6-90V 10A 600W
$36 - DROK DC-DC Numerical Control Step Down Voltage Converter, 6-65V to 0-60V 8A 400W
$13 - Yeeco DC Motor Speed Control Driver Board 3V-35V 5A PWM Controller
$11 - DIGITEN DC 12V LED Digital Thermometer -50-220F Fahrenheit Temperature + Temp Probe Red
$7 - Switch I had one already but something like this will work
$10 - Screws I also had to mount the controllers + power supply to the PLA
$3 - LED Lights
$8 - Header Set of raisers x 2
$25 - PLA Wasted about 1 roll
total 212 CAD or $165 US
I've been printing for a couple months now so still a noob, and learning how to create in fusion 360, but for a first project it turned out pretty good.
I first tried this with a 500 watt 12V 40AMP power supply, which i though would work great with the step up converter to bring it up to 58.8v for my 52v battery, but it didn't, it's actually kinda bullshit advertising.
the 600 Watt step up converter I bought can only step up to 600 watts at 60v, at 12v it can only output 120 watts, 10a x 12v. Basically this charger could only charge at 120 watts / 58.8v, roughly 2 amps, or what a basic shitty charger that comes with the bike can do. No point of going through all this to make a 2 amp charger.
So I opted to switch to a 48v power supply, so i can get close to 480 watts out of the charger.
The new power supply came in and I got it up and running, but for the hell of me could not charge at more then 4 amps, I tested with bigger wires, and I didn't know why it was dropping to 30v under load. Then as i was putting it away for return, I saw the stupid small side switch that was set on 220v instead of 110v. I swapped it over to 110v, and viola the charger was flying at just over 7 amps, 7 x 53v or almost 400 watts.
Now it was time to build a case for this thing.
I designed the case in fusion 360 with cooling in mind, so I put 2 high cfm fans in, one at the top blowing air out, and the one on the bottom sucking air in.
Since the power supply is almost the size of my 300mm print bed, I knew I had to print it in 2 pieces and assemble it after.
Final assembly is still in progress, I have everything mounted in, cables hidden as much as I could, waiting on more black PLA, so i can reprint the top and make the bottom translucent with the LEDs behind.
I'm also waiting on more raisers to come, so I can bring the adjustable LCD for the Step up converter above the front cover. This way I can switch between the pre-sets I programed in, 48V Slow / Fast / Preserve ( 85% ) & 52V Slow / Fast / Preserve ( 85% )
I have a temp gauge in and it's showing a good 10 degrees cooler with the fans on. The whole idea of the fans is just to make a wind tunnel through the whole case. The step up and step down converter fans have been removed as they are not needed anymore. I also added a variable DC-DC knob thingy so I can adjust the fan speed, depending how fast I charge.
Before you say You shouldn't charge at such high amps, I actually charge around 6 amps on my 52v which has the upgraded high discharge rate cells and can handle alot more then 6 amps. And for the 48v stock battery I just run it at 3 Amps all day and it's pretty happy.
Questions ?
video of Nexi and his project
https://www.youtube.com/watch?v=vGrBT_P9Xfc