If you have ever considered a backup battery for your cpap

lynninnj wrote: ↑

Fri Jul 19, 2024 12:22 pm

I recall that conversation. I was thinking more specifically that there was something about the differences between having your device computer CPAP, whatever plugged into one of the power outlets versus the AC outlet. I could be completely mistaken. It’s been a while.

Yes, part of the conversation was also about advantages/disadvantages of plugging into AC or DC.

I have both options available to me:

But I prefer to use the AC outlet, when using it as a UPS/EPS. This way I'm plugged into the the grid, and not using the battery at all.

However should there be an anticipated power outage, I would use my DC-DC converter as it is more efficient.

For our Delta 2 units:

AC:

• Unit acts as a UPS/EPS doesn't draw from battery therefore extending life of batteries
• When on battery not as efficient as on DC

DC:

• More efficient battery usage, than AC, the unit's charge will last longer
• Does line conditioning, protects against Spikes, voltage overage/under, brownouts
• Draws from battery, therefore there is a continuous draw/recharge which reduces lifetime of battery

Dog Slobber wrote: ↑

Fri Jul 19, 2024 2:18 pm

lynninnj wrote: ↑

Fri Jul 19, 2024 12:22 pm

I recall that conversation. I was thinking more specifically that there was something about the differences between having your device computer CPAP, whatever plugged into one of the power outlets versus the AC outlet. I could be completely mistaken. It’s been a while.

Yes, part of the conversation was also about advantages/disadvantages of plugging into AC or DC.

I have both options available to me:

But I prefer to use the AC outlet, when using it as a UPS/EPS. This way I'm plugged into the the grid, and not using the battery at all.

However should there be an anticipated power outage, I would use my DC-DC converter as it is more efficient.

For our Delta 2 units:

AC:

• Unit acts as a UPS/EPS doesn't draw from battery therefore extending life of batteries
• When on battery not as efficient as on DC

DC:

• More efficient battery usage, than AC, the unit's charge will last longer
• Does line conditioning, protects against Spikes, voltage overage/under, brownouts
• Draws from battery, therefore there is a continuous draw/recharge which reduces lifetime of battery

In the last two bullets I am left with questions. Do you use a surge protector for your delta 2? Are you also saying the dc/dc acts a bit like a surge protector or does it just balance current out a bit?

Did you experiment for a night yet to see the energy efficiency differences of ac vs dc? obviously if using as a backup during outage this would be a priority.

lynninnj wrote: ↑

Sat Jul 20, 2024 5:17 am

In the last two bullets I am left with questions. Do you use a surge protector for your delta 2? Are you also saying the dc/dc acts a bit like a surge protector or does it just balance current out a bit?

Did you experiment for a night yet to see the energy efficiency differences of ac vs dc? obviously if using as a backup during outage this would be a priority.

I don't use a surge protector.

Whenever one is using a power station, and drawing from the batteries, then line-conditioning (surge protection) naturally happens.

Haven't experimented with AC vs DC efficiency yet.

Dog Slobber wrote: ↑

Thu Jul 18, 2024 9:09 am

ResMed still does not have a Air11 branded DC-DC converter, but the AirMini DC-DC Converter numbers are 24v at 65w, which is the same output as the Air11 power brick. The port is compatible and it would be a huge mistake for ResMed to produce a form-factor compatible port that isn't pin compatible.

Supposedly it does now: I just bought this: https://www.respshop.com/cpap-supplies/ ... -1902.html
It's branded as ResMed. Maybe it's actually the Mini converter, or maybe it's a fake, but it's branded as ResMed.

Another link: https://www.apriadirect.com/resmed-air11-dc-converter

Dog Slobber wrote: ↑

Sat Jul 20, 2024 7:48 am

lynninnj wrote: ↑

Sat Jul 20, 2024 5:17 am

In the last two bullets I am left with questions. Do you use a surge protector for your delta 2? Are you also saying the dc/dc acts a bit like a surge protector or does it just balance current out a bit?

Did you experiment for a night yet to see the energy efficiency differences of ac vs dc? obviously if using as a backup during outage this would be a priority.

I don't use a surge protector.

Whenever one is using a power station, and drawing from the batteries, then line-conditioning (surge protection) naturally happens.

Haven't experimented with AC vs DC efficiency yet.

Please let me know. Would be helpful to determine if it’s worth the extra money for adapter by giving a noticeable boost in battery efficiency.

Someone below posted the link to it and it remains on my radar.

This is a great thread!

I am definitely in need of one of these backup batteries. Was looking at both the Ecoflow River 2 499Wh for $300 and the larger Delta 2 1024WH for $500. These larger & more capable batteries have come down to much more affordable levels from even just a year or two ago.

I'm glad to see Resmed finally released the DC converted for the Airsense 11. It's not yet listed on Resmed's corporate website but I've found Resmed Part #39231 on the online sites for multiple cpap resellers, but not yet here at cpap.com.

I'm running out of excuses keeping me from investing in a battery backup solution now. In the one power outage we had this summer the, I camped out on a recliner not wanting to go lie down to sleep without the cpap. Thankfully the power came back by 1am.

I've really been getting into solar backups recently. I have an Ecoflow 2. And I love it But I think it's overkill for CPAP. I use an Ecoflow River 2 (1 quarter the size), and it works great.
Always make sure the Ecoflow product you buy has a 2 or 3 in it's name or you are likely not getting an LFP battery.

You want LFP for a variety of reasons, but mostly because it lasts 10 times longer !!

JaxTom wrote: ↑

Tue Sep 03, 2024 6:44 am

I've really been getting into solar backups recently. I have an Ecoflow 2. And I love it But I think it's overkill for CPAP. I use an Ecoflow River 2 (1 quarter the size), and it works great.
Always make sure the Ecoflow product you buy has a 2 or 3 in it's name or you are likely not getting an LFP battery.

You want LFP for a variety of reasons, but mostly because it lasts 10 times longer !!

I totally agree with you about the lithium, iron phosphate batteries! I wouldn’t buy the lead or lithium ion batteries.

I got the adapter at cpapsupplies.com. I think I signed up for some sort of newsletter and got a 15% discount. I also use retailmenot.com and I believe I’m getting another 3% back from them and 3% back from my credit card for online orders. With the 15%? discount I think it was I got the adapter for around $64? much better than $100. (might have used other discount codes or first time order special code?)

I experimented for a few nights using the heat and humidity settings that I normally use. This dropped the delta two down approximately 31% per night. Without turning the settings down, I should get three full nights of CPAP use if the power went out. The smaller batteries would give you one possibly two nights. If you didn’t have any of these extras turned on you would get many more nights out of it.

A poster here did a deeper dive on this that suggested almost 10 nights at 8hr nights with no heat and humidity turned on. (He can soeak up if he has more to add and deserves credit but I leave it to him. )

I bought my delta two on sale, but the price is gone up since then. They will probably go on sale again on the next prime day. I can’t remember if they have one in October or if it’s just a cyber Monday after Thanksgiving but there you go.

I also have a nice solar panel for mine. I don’t feel like it’s overkill because it is powerful enough that if I needed to share my kwh with my fridge to let it cool down until compressor turns off, I can.

jmho