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Open Roads Forum  >  Tech Issues

 > Modified/pure sine wave

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pianotuna

Regina, SK, Canada

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Posted: 12/18/19 06:36am Link  |  Quote  |  Print  |  Notify Moderator

Hi tarnold,

If that 2 amps is at 120 volts AC, then the demand at 12 volts DC may be 20 amps. That would be 40 amps in total.

Since batteries should not be taken below 50%, there are only 115 amp-hours available. So the 230 amp hour battery bank may not last more than 3 hours with both units running.

tarnold wrote:

Op, both units have large bricks. The reperonics ASV and the O2 each require 2amp. So 7 hrs at night. Installed 2 new 230amp 6volts yesterday.



Regards, Don
My ride is a 28 foot Class C, 256 watts solar, 556 amp hours of AGM in two battery banks 12 volt batteries, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

RayJayco

Tampa

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Posted: 12/18/19 06:58am Link  |  Quote  |  Print  |  Notify Moderator

O2 concentrators are noisy, 2 hours battery for the units that I have seen and most of the portables cannot exceed 2 lpm.

Talk to the doctor about liquid oxygen... Doesn't need electricity, can deliver as much as needed and the tanks weight is about equal to a concentrator...


Inquiring minds want to know...

BFL13

Victoria, BC

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Posted: 12/18/19 07:12am Link  |  Quote  |  Print  |  Notify Moderator

Example only. Your rig's layout will determine how to fit it all.

In 2012 our 5er had a 2000w MSW (Vector--the red one) and a 1000w PSW on the same battery bank (four 6s), with a 100a converter/charger (the PowerMax shown below the inverters). Had a 3000w Honda gen to run the charger.

You will need six 6s IMO to run those two medical equipments all night. EDIT--plus the rest of your 12v needs. Some solar would help with AHs too.

">][image]

Here is a good quality 1000w PSW inverter for a decent price. We have the 2000w version in the sig rig. (There are other brands of course, but I know this one works based on how ours does)

https://powermaxconverters.com/product/pmx-1000w-psw/

* This post was edited 12/18/19 07:56am by BFL13 *


1. 1991 Oakland 28DB Class C
on Ford E350-460-7.5 Gas EFI
See Profile for House electronics set-up.
2. 1991 Bighorn 9.5ft Truck Camper on 2003 Chev 2500HD 6.0 Gas

2oldman

New Mexico

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Posted: 12/18/19 09:14am Link  |  Quote  |  Print  |  Notify Moderator

BFL13 wrote:

Example only. Your rig's layout will determine how to fit it all.
Are those power bricks in the lower left corner? hahahahaha

BFL13

Victoria, BC

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Posted: 12/18/19 09:47am Link  |  Quote  |  Print  |  Notify Moderator

2oldman wrote:

BFL13 wrote:

Example only. Your rig's layout will determine how to fit it all.
Are those power bricks in the lower left corner? hahahahaha


Low voltage gate bricks, still in use in this rig. (Sorry, OP, will get back on track ASAP)

">][image]

* This post was edited 12/18/19 10:03am by BFL13 *

2oldman

New Mexico

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Posted: 12/18/19 10:09am Link  |  Quote  |  Print  |  Notify Moderator

BFL13 wrote:

Low voltage gate bricks,
[emoticon]

tarnold

georgia

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Posted: 12/18/19 10:16am Link  |  Quote  |  Print  |  Notify Moderator

Op. The O2 respironics is mostly Chinese writing but 100-240 2 amp or 19v 7.9amp. This machine is nice to have but not critical. However the ASV on the other hand is a got to have. It’s also a respironics with 120v 2amp or 12v 6.67amp

* This post was edited 12/18/19 03:42pm by tarnold *

BFL13

Victoria, BC

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Posted: 12/18/19 10:24am Link  |  Quote  |  Print  |  Notify Moderator

tarnold wrote:

Op. The O2 respironics is mostly Chinese but 100-240 2 amp or 19v 7.9amp. This machine is nice to have but not critical. However the ASV on the other hand is a got to have. It’s also a respironics with 120v 2amp or 12v 6.67amp


12.5v (say) x 6.67 = 83.4w
120 x 2 = 240w

Seems strange.

I have no info on the ASV, but info on CPAPs on here before says that you can save power by not using the ? humidity? part, if not needed.

tarnold

georgia

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Posted: 12/18/19 03:44pm Link  |  Quote  |  Print  |  Notify Moderator

The humidifier is the power hog, but we don’t use it when on the road.

BFL13

Victoria, BC

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Posted: 12/18/19 04:38pm Link  |  Quote  |  Print  |  Notify Moderator

tarnold wrote:

The humidifier is the power hog, but we don’t use it when on the road.


If you had a Kill-A-Watt, you could measure the 120v draw of those things on shore power when using them the same way you would use them when off-grid using an inverter.

That would tell you what the actual wattage draw would be from the inverter, which is what is missing here.

https://www.homedepot.com/p/Kill-A-Watt-Electricity-Monitor-P4400/202196386

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