Prisma 20A

[pilotxxl]

Hello, I am looking for a powerbank or battery for travel for my Weiman Prisma 20A. Do you have information where I can find them.

[rfburns]

Hello, welcome to the board.

It seems like Weinmann Prisma 20A uses a 37v 2.5A DC power input. (Part# WM24133)



That's quite an unusual power requirement - my Resmed AirSense 10 requires a 24v 3.75A input with a 7.4mm x 6.0mm DC barrel connector that it shares with many Dell/HP laptops. The connector for your machine also seems quite unusual, and not readily available as a spare part, as is present in the manual:



The manual (pg. 21) recommends using the provided AC/DC power supply with a DC/AC inverter for mobile use, specifying the use of the WM24616 for 12v DC input, or WM24617 for 24v DC input. However, I'm sure you can use any quality DC/AC inverter with a pure sine wave (not modified sine wave, corrected sine wave, square wave, etc.) AC output for your machine, provided it can sustain the requirements of your provided AC/DC power supply.

That should suffice as a ready-made solution that you can hook up to a lead-acid/lithium battery, at the relative expense of portability and weight.

You could also go the route of putting together a custom power solution that meets your runtime and weight requirements, but that would require sacrificing an AC/DC power brick for the power supply cable (and taking care to fulfill any odd signaling requirements à la ResMed) and a bit of DIY electrical work, but would make for an interesting weekend project if you're so inclined. Remember that AC/DC conversion incurs significant losses compared to DC/DC conversion, and having purely DC/DC conversion in a custom battery pack would allow you to extract the maximum power from your battery.

So, easy plug-and-play solution:

• Prisma 20A
  

• connected to Included AC Power Supply
  

• connected to AC/DC Pure Sine Wave Inverter (12v) capable of a sustained (not peak) load of 360W or greater
  

• connected to 12v SLA (preferably deep-cycle capable) battery or lithium battery pack capable of outputting ~12v, or a 12v automobile/airplane outlet.
  

You will also need a charger to charge the battery, and the battery capacity should be selected based on how many hours you are planning to use the device between charges, and whether you have any power-consuming features (humidifier, heated hose) set to on, or at higher levels.

You can also simply buy a portable power station, such as the Jackery Explorer 240 or Explorer 500, and plug in your power supply directly into that for an even easier solution. Amazon Germany has these available for sale.

[pilotxxl]

Hello @rfburns, thanks for your info. I will consider the solution with the power station.

[JamesD0079]

Hi there, thanks for this, it is very helpful as I'm also looking for a battery solution for my Prisma 20A. I'm having trouble working out the power consumption of my 20A and what size battery I'll need for say a 3 night camping trip. Say I use the my 20A at humidity level 4 (out of 7) but rarely go above 8.0 in pressure, and mostly sit around 6.5, are you able to advise roughly how much power I'm using? Thanks!!