Camping with the cub scouts? resmed airsense and power tool batteries?

palerider · Post by **palerider** » Thu Mar 12, 2020 2:02 pm

Lifeisabeach wrote: ↑
Thu Mar 12, 2020 1:48 pm

palerider wrote: ↑
Thu Mar 12, 2020 12:29 pm

arhdc wrote: ↑
Wed Mar 11, 2020 8:21 pm
Ok, I am not sure where to start.

....
If I was going to try to do this, I would tear that Milwaukee battery to USB adaptor apart ...
This, however, is good advice.
Great advice... assuming he knows how to do this safely and doesn't need those batteries anymore for use with his tools.

Reading is fundamental.

palerider · Post by **palerider** » Thu Mar 12, 2020 2:12 pm

Lifeisabeach wrote: ↑
Thu Mar 12, 2020 2:02 pm

palerider wrote: ↑
Thu Mar 12, 2020 12:36 pm

Lifeisabeach wrote: ↑
Wed Mar 11, 2020 9:34 pm
So your 5 Ah batteries should last you 8 hours,
Not even close.
I'll remember that the next time my 4 Ah battery gets close to that.
Lifeisabeach wrote: ↑
Wed Mar 11, 2020 9:34 pm
The inverter WILL warm up as it's running.
palerider wrote: ↑
Thu Mar 12, 2020 12:36 pm
Battery life wasted as heat.
Thus why I mentioned it.

Lifeisabeach wrote: ↑
Wed Mar 11, 2020 9:34 pm
I'm not sure that running it for 8 hours is a safe usage scenario for these batteries.
palerider wrote: ↑
Thu Mar 12, 2020 12:36 pm
Literally your best contribution to the thread.
He asked a question, I directly answered it, even with qualifiers. It really kills you that I actually gave him the answer he was looking for, doesn't it?

You have him a *bad* answer that would waste his money and give, at best, poor results.

The question had already been answered much better by someone else, that evidences superior knowledge.

This forum exists to provide *good* information and refute *bad* information. Yours was bad.

I'm sorry it "really kills you".

Lifeisabeach · Post by **Lifeisabeach** » Thu Mar 12, 2020 2:16 pm

palerider wrote: ↑
Thu Mar 12, 2020 2:02 pm
Reading is fundamental.

Hey pot! Meet kettle:

palerider wrote: ↑
Thu Mar 12, 2020 8:24 am

Lifeisabeach wrote: ↑
Wed Mar 11, 2020 11:40 pm

palerider wrote: ↑
Wed Mar 11, 2020 10:54 pm

Lifeisabeach wrote: ↑
Wed Mar 11, 2020 9:34 pm
Now, Milwaukee doesn't appear to make an equivalent to this, but someone makes an adapter that lets you use the Ryobi inverter with Milwaukee's batteries.
Given that he *does not even have that brand*, it doesn't even come close to "getting the job done with what's "on hand".

Pugsy · Post by **Pugsy** » Thu Mar 12, 2020 2:20 pm

Enough already with the bickering.
Talk to the OP and answer his questions if you can. If you can't, how about just sitting on your fingers???
This dead horse has been whipped to death several times.

Fair warning...and everyone knows there is only one.

ChicagoGranny · Post by **ChicagoGranny** » Thu Mar 12, 2020 2:37 pm

Lifeisabeach wrote: ↑
Thu Mar 12, 2020 2:02 pm

He asked a question, I directly answered it, even with qualifiers.

I'm not skilled in helping with electrical questions (Shocking isn't it?). But, it's clear that people come here regularly asking the wrong questions. Direct answers don't do people any good when they are asking the wrong questions.

Maybe my lack of electrical knowledge misleads me, but it seems like the OP is headed down the wrong road.

Dog Slobber · Post by **Dog Slobber** » Thu Mar 12, 2020 3:21 pm

ResMed Battery Guide:
https://www.resmed.com/us/dam/documents ... lo_eng.pdf

Under ideal conditions:

DC-DC Converter
Fixed pressure of only 6 CM
Slimline tubing
No heated humidifier

Resmed documents a battery capacity of 9AH to last 8 hours.

There is no way a 5 AH (let alone 4 AH) battery, *with an inverter* is going to last 6 hours. Using it a few times, for a few hours which you might get you a few hours, but the complete discharge is going to damage or severely reduce the life of the battery.

Dog Slobber · Post by **Dog Slobber** » Thu Mar 12, 2020 3:22 pm

ChicagoGranny wrote: ↑
Thu Mar 12, 2020 2:37 pm

I'm not skilled in helping with electrical questions (Shocking isn't it?).

I got a charge out of that.

Lifeisabeach · Post by **Lifeisabeach** » Thu Mar 12, 2020 3:27 pm

ChicagoGranny wrote: ↑
Thu Mar 12, 2020 2:37 pm

Lifeisabeach wrote: ↑
Thu Mar 12, 2020 2:02 pm

He asked a question, I directly answered it, even with qualifiers.
I'm not skilled in helping with electrical questions (Shocking isn't it?). But, it's clear that people come here regularly asking the wrong questions. Direct answers don't do people any good when they are asking the wrong questions.

Maybe my lack of electrical knowledge misleads me, but it seems like the OP is headed down the wrong road.

Oh I don't disagree. But consider this: he could have found the adapters on his own and jumped right in and picked them up on his own. At least by bringing them up as an option, I was also able to lay out the downsides to using them from my own perspective in having used them in this capacity (heat generation; more batteries to tote; questionable safety for using all night). I laid this all out up front.

Goofproof · Post by **Goofproof** » Thu Mar 12, 2020 3:33 pm

Dog Slobber wrote: ↑
Thu Mar 12, 2020 3:22 pm

ChicagoGranny wrote: ↑
Thu Mar 12, 2020 2:37 pm

I'm not skilled in helping with electrical questions (Shocking isn't it?).
I got a charge out of that.

AC or DC, I do both, with a little RF, Thrown in!

Jim

Lifeisabeach · Post by **Lifeisabeach** » Thu Mar 12, 2020 3:54 pm

Dog Slobber wrote: ↑
Thu Mar 12, 2020 3:21 pm
ResMed Battery Guide:
https://www.resmed.com/us/dam/documents ... lo_eng.pdf

Under ideal conditions:
DC-DC Converter

Fixed pressure of only 6 CM

Slimline tubing

No heated humidifier

Resmed documents a battery capacity of 9AH to last 8 hours.

There is no way a 5 AH (let alone 4 AH) battery, *with an inverter* is going to last 6 hours. Using it a few times, for a few hours which you might get you a few hours, but the complete discharge is going to damage or severely reduce the life of the battery.

I really don't think I'm mis-remembering the hours I've used this for, but I can't rule it out entirely. I've only used it 4 or 5 times in the past year or so since they came out with these, but once was for nearly an entire evening, I'm fairly certain. I've mainly used this when losing power unexpectedly during the day when working overnights, but those would have been 3-5 hour usage sessions since it's happened partway into the morning. I keep it on hand to quickly dock so I can jump right back to sleep if it happens. The one time I used a 2 Ah battery, it did discharge completely, but I've not discharged a 4 Ah battery yet.

EDIT: I'm looking over Home Depot's Q&A for the inverter and there's one for using it with a CPAP. There are a handful of replies, and one person says they got 6.5 hours on a 4 Ah battery on their "ResMed 9" with the humidifier off. Another person says 5 hours on a 6 Ah battery, but no indication of what machine or if a humidifier is in use.
https://www.homedepot.com/p/RYOBI-150-W ... /308460871

Lifeisabeach · Post by **Lifeisabeach** » Thu Mar 12, 2020 4:15 pm

Hmmm... you know what? After reading a comment on Home Depot's Q&A regarding the Ryobi inverter about pure sine wave vs modified sine wave, I have to completely retract any suggestion of using this as an option. According to ResMed's documentation:

We recommend using a pure sine wave inverter with a continuous power rating of 300 watts and a peak/surge rating of 500 watts.

That Ryobi inverter uses a modified sine wave and is rated for 150 watts continuous. So I stand corrected (edit: not so much... see below). And it's a good thing for my own self that I got involved in this discussion or I'd still be blissfully and incorrectly using it in a pinch.

EDIT: BTW, that also explains why it was running longer on that battery than it should have.

2nd Edit: Ok, I knew I had looked into this before. Ryobi actually does say a modified sine wave inverter at 150 watts can be used with the S9 series, which is what I had been using this thing with before. I had completely forgotten about the limited supported models though, and it's definitely NOT an option for the Air10 line.

3rd edit: ResMed's website has a travel FAQ that elaborates more on this than the battery guide does. The Air10 series will run on this inverter.
https://www.resmed.com/au/en/consumer/s ... -faqs.html

Mr. Snorestoomuch · Post by **Mr. Snorestoomuch** » Thu Mar 12, 2020 4:44 pm

I'm glad for it. Working inefficiently off a marine battery is okay when you're in a pop up camper, but off the shelf (or toolbench) batteries are a much better solution than the medical branded batteries... once you know enough to do them properly.

arhdc · Post by **arhdc** » Thu Mar 12, 2020 7:20 pm

Sooooooo, not to stir up the fight but we need to talk about electricity and how it is measured.

There are three common measurements here in the USA and they are Amps, Volts, and Watts.

Amps are related to load and Ah to load over a period of time, thus the term Amp Hour or Ah. This is the number hours that, in this case a battery, can meet a 1 amp draw.

Volts are the amount of pressure that the power flows at.

Watts is a calculated value and is the actual amount of power that is available (in the case of a battery) and can be expressed by the equation (Amps) x (Volts) = Watts or (A)(V)=W

Still with me? Probably not but what the heck, I am a narcissist

Sooooo, in the case of a 12v 4Ah battery, we can calculate the Watts as so: (12v)(4Ah)=48 Watts for 1 hour or 48Wh

An 18v battery that is 4Ah would be: (18v)(4Ah)=72 Watts for 1 hour or 72Wh

When discussing the relative capacity of batteries we must not only look at the Amp Hours but also the Voltage as it factors into the Watt-Hours, the actual amount of power that is available.

I am now eagerly awaiting the inevitable banishment for being a smart a$$.

Peace, Love and Good Health to you all

Goofproof · Post by **Goofproof** » Thu Mar 12, 2020 8:50 pm

arhdc wrote: ↑
Thu Mar 12, 2020 7:20 pm
Sooooooo, not to stir up the fight but we need to talk about electricity and how it is measured.

There are three common measurements here in the USA and they are Amps, Volts, and Watts.

Amps are related to load and Ah to load over a period of time, thus the term Amp Hour or Ah. This is the number hours that, in this case a battery, can meet a 1 amp draw.

Volts are the amount of pressure that the power flows at.

Watts is a calculated value and is the actual amount of power that is available (in the case of a battery) and can be expressed by the equation (Amps) x (Volts) = Watts or (A)(V)=W

Still with me? Probably not but what the heck, I am a narcissist

Sooooo, in the case of a 12v 4Ah battery, we can calculate the Watts as so: (12v)(4Ah)=48 Watts for 1 hour or 48Wh

An 18v battery that is 4Ah would be: (18v)(4Ah)=72 Watts for 1 hour or 72Wh

When discussing the relative capacity of batteries we must not only look at the Amp Hours but also the Voltage as it factors into the Watt-Hours, the actual amount of power that is available.

I am now eagerly awaiting the inevitable banishment for being a smart a$$.

Peace, Love and Good Health to you all

You seem to be a little short on the Smart Part, but you are overcompensating on the a$$ part. Just string some words together and try to get lucky,,,

Jim

Jake00 · Post by **Jake00** » Fri Mar 13, 2020 6:25 am

I'm using the jack on both the M18 and m12 power sources, which I've verified puts out 12V.
I guess i'm stuck buying the resmed dc convertor since the Cpap needs to "recognize" the power source

Camping with the cub scouts? resmed airsense and power tool batteries?

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