Struggling/Seeking AC-DC (24V) Adapter for Cold Plunge Tub

Power Power Supplies (off-board)
1

Background:
I built a professional grade therapeutic cold plunge about 2 years ago and have struggled to find the appropriate AC-DC power adapter to power the water pump. The water pump is 24V 150 watt and runs 24/7. The Chinese company I bought the pump from supplied me with the power adapter with specs seen in uploaded photos. It produced too much heat being locked inside an electrical enclosure on the side of the tub. It only lasted about 1.5 years - it struggled to supply the water pump with its necessary wattage or amperage to pump sufficient water through the tubs plumbing system. I decided to purchase the VGS-350D-24 (350W) by CUI power adapter from Digikey thinking if I go up in quality and wattage, maybe it will last longer. Turns out the adapter generated so much heat it caused this adapter to be defective only supplying about 25-50% of the necessary power for the water pump. It seemed to work fine at first. The adapter only lasted a few days and I currently have a pending return to digikey.

Assessment:
Currently, I have been researching numerous power adapters to hopefully find a permanent solution. My belief if that I need an adapter with a built-in fan considering I have no fan inside the electrical enclosure. I have my eye on part # GHA500F-24-SNF (500W) by Cosel. I’d be increasing wattage from 350 to 500, built-in fan, and higher heat tolerance. The size of the adapter is also appropriate to fit inside my small electrical enclosure.

Recommendation:
Please review and advise if this GHA adapter is the most appropriate or better options.

Notice:
I am not an electrician or an engineer but my dad (engineer) taught me a lot growing up.

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B6C25646-B5A8-495F-92E1-0EA59FD4F6AB_1_201_a4032×3024 3.46 MB

95F92F19-789D-4CD3-84D9-AF68183016C8
95F92F19-789D-4CD3-84D9-AF68183016C83024×4032 2.77 MB

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DC954EB6-475D-4369-BEB8-7F40CC197A24_1_105_c769×1024 158 KB

2

mbdiotte

Thank you for contacting DigiKey , The biggest issue I am seeing is that the enclosure does not have any ventilation to help with cooling the power supply so the fan on the power supply will not do much good , here is a link for the instruction guide with derating curves , https://en.cosel.co.jp/tool/tag/pdf/CME_GHA.pdf

Thanks Craig

3

I agree with @Craig_2048. The most likely problem is that the air-tight enclosure is creating an oven. You need to do one of the following:

  • Remotely mount the power supply away from moisture outside the enclosure and run the power in via a sufficiently long cable
  • Get an IP rated (Ingress Protection) air convection-cooled power supply such as the ABS400-1024 and mount it just outside your enclosure
  • Get a suitable ventilated enclosure which still minimizes water ingress (perhaps vents on the bottom side?) This is probably not a viable solution
  • Get a sealed metal enclosure and use a conduction-cooled power supply (conducts heat via the base plate to a metal enclosure which acts as heat sink) such as the LCC600-28U-9P24