Re: Converting thermoelectric fridge to DC- bypassing power supply

Oh, that wasn't originally my thread. It wouldn't let me start a new thread when I first joined. But I do think I may have found what I was looking for.

Hi guys, so I'm new here and not very knowledgeable in electronics, so I am hoping someone could help me with this. I have a thermoelectric fridge with one of those Chinese power supply/temp control boards and I'm trying to bypass the 120vac side to tap a 12vdc input lead directly into where 12vdc is created on the board, and before the temperature control section, in order to preserve the temperature control function (I don't want it running full power all the time).

I believe I've determined where negative is (partially marked in orange in 1st pic, which is right under the big transformer...

Re: Thermo electric pcb power supply

Hmm...good point. I was assuming that since the fans and Peltier are getting 12vdc that the temperature control function also is controlled by 12v. The fridge, while in cooldown/full power mode, draws 68 watts so the Peltier module itself is probably a 60-watt (nominal) module, probably a TEC1-12706, so that large transformer is probably 5 amps.

Re: Thermo electric pcb power supply



I understand that, but isn't there a way to feed it 12v before the temp. control section, essentially bypassing the converter section? I definitely need the temp. control function because I don't want it running full-on all the time....

Re: Thermo electric pcb power supply

Alright...I think I'll just use an inverter when I want to use it on the road or off-grid, even though I lose some efficiency. I may be jumping in to the deep end too soon. There's obviously much more I need to learn before I mess with this.

Thanks anyway, guys.

Re: Thermo electric pcb power supply



Thanks. That's probably why my meter went kaput! Learning as I go...

I'm guessing the big transformer is where the stepdown takes place, so the diode(s) should be after that, right?...

Re: New Members - please post your introductions here

Hi everyone, new here. I built a custom thermoelectric fridge using a power supply/controller I saved from the landfill, which came out of an Avanti countertop water dispenser that someone left by the dumpster in my apartment complex. It's one of those Chinese boards (Hanny), similar to what you'd find in a Chefmate or Haier thermoelectric fridge or wine cooler. My electronics knowledge is fairly limited but I am attempting to figure out how to add a 12VDC input to my ~0.7 cu. ft. fridge to be able to use it on the road or with...

Re: Thermo electric pcb power supply

Hi, I know this is an old thread but I just joined because I'm trying to convert my thermoelectric fridge to be able to run on 12VDC input and this is the thread I found when searching for info. related to servicing the PSU boards that run these things.

I have one of those Chinese boards made by Hanny (part no. S126AM14-5), like the ones found in Haier, Avanti, and Chefmate thermoelectric refrigerators and wine coolers. This particular one was salvaged out of a countertop water dispenser and is being used in a custom 0.7 cf homebuilt...