I have a 2021 Transend 240 ML trailer with a factory installed 100 w Furrion panel, 25 A MPPT charge solar controller. Does this just charge the tongue battery? Can I use this to run 2 Capp machines while off grid
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Originally posted by zimdavid View PostI have a 2021 Transend 240 ML trailer with a factory installed 100 w Furrion panel, 25 A MPPT charge solar controller. Does this just charge the tongue battery? Can I use this to run 2 Capp machines while off grid
BrianBrian & Michelle
2018 Reflection 29RS
2022 Chevy 3500HD
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Originally posted by zimdavid View PostI have a 2021 Transend 240 ML trailer with a factory installed 100 w Furrion panel, 25 A MPPT charge solar controller. Does this just charge the tongue battery? Can I use this to run 2 Capp machines while off grid
To your question: yes, the solar panel's purpose is to charge the battery. That's the primary purpose for any solar setup! (There are minor exceptions but not important at this point.)
When it comes to running the CPAP machines, the answer is "it depends". How much power does the CPAP draw over the course of 8 hours? What type of battery (or batteries) is in your trailer?
Your 240ML has a 12V refrigerator, right? Keeping the battery bank at a sufficient charge to maintain the refrigerator is, IMHO, priority #1. I suspect that even with the solar panel you'll need a supplementary way to recharge the battery if off-grid for any length of time.
There's a ton more to discuss, but it depends on how deep you want to go with this topic. If you want more information, feel free to ask more questions.
HowardForum moderators are not GD employees--we are volunteers and owners presumably just like yourself. Unless specifically mentioned otherwise, we have nothing to gain should you choose to purchase a product or engage a service we discuss on this forum.
Howard & Francine
2017 Ford F-350 DRW, '19 315RLTSPlus
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Originally posted by zimdavid View PostI have a 2021 Transend 240 ML trailer with a factory installed 100 w Furrion panel, 25 A MPPT charge solar controller. Does this just charge the tongue battery? Can I use this to run 2 Capp machines while off grid
I did a write up on how I wired in my CPAP power. Use the search feature here.
Hope this helps2018 Reflection 150 Series 220RK 5th whee, Star White 2022 F350 King Ranch CC Long bed (HAL) (CCC 4062lbs), B&W 25K OEM Companion,. SteadyFast system, Trailer reverse lights, rear receiver spare tire holder, storage tube, sumo springs, Victron MultiPlus 12/120/3000, Solar, Custom 6K axles upgrade, and other modifications.
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Originally posted by zimdavid View PostCPAP is a Resmed Air Sense 10 24V 3.74 A
Trailer battery is a Interstate Marine 24M-XHD CCA 800, MCA 1000 RC 135
Even if your trailer had an inverter, the 53W typical consumption of each CPAP means that each one (if it could run off of 12v) would consume power at a rate of ~4.5 amps per hour (aH). (53W divided by 12v = 4.5 amps). Two of these machines = 9aH. I can't tell the aH capacity of your battery, but since you'll be consuming ~72aH over 8 hours with two machines running...there's no doubt more battery power is required. As a comparison, a top-of-the-line Battle Born LifePO4 battery has 100aH. 100% of it's charge is useable, so even one of those would be 3/4 consumed in 8 hours. We haven't even factored in the refrigerator or furnace yet!
Perhaps others here, like Yoda , can share their first-hand experience with trailer-friendly (12vDC) CPAP machines. And consider upgrading your batteries. TucsonJim has an excellent primer here: https://gdrvowners.com/forum/operati...ithium-battery
HowardForum moderators are not GD employees--we are volunteers and owners presumably just like yourself. Unless specifically mentioned otherwise, we have nothing to gain should you choose to purchase a product or engage a service we discuss on this forum.
Howard & Francine
2017 Ford F-350 DRW, '19 315RLTSPlus
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Originally posted by zimdavid View PostCPAP is a Resmed Air Sense 10 24V 3.74 A
Trailer battery is a Interstate Marine 24M-XHD CCA 800, MCA 1000 RC 135
https://www.1800cpap.com/resmed-s9-s...verter-24v-90w
https://www.amazon.com/Replacement-C...ag=googhydr-20
https://www.amazon.com/Resmed-37297-.../dp/B0721T72ML
https://www.directhomemedical.com/re...ower-cord.html
https://www.thecpapshop.com/dc-power...ense-10-series
https://www.cpapxchange.com/dc-power...ne-resmed.html
Give your supply house a call - they will have one, Ask for a DC to DC adapter power cord that plugs into a 12V power point - (think old cigarette lighter) 12V power port.
Hope this helps - Keith2018 Reflection 150 Series 220RK 5th whee, Star White 2022 F350 King Ranch CC Long bed (HAL) (CCC 4062lbs), B&W 25K OEM Companion,. SteadyFast system, Trailer reverse lights, rear receiver spare tire holder, storage tube, sumo springs, Victron MultiPlus 12/120/3000, Solar, Custom 6K axles upgrade, and other modifications.
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Originally posted by Yoda View PostEvery CPAP made can be operated off of a 12V power plug. You just needs the adapter
Forum moderators are not GD employees--we are volunteers and owners presumably just like yourself. Unless specifically mentioned otherwise, we have nothing to gain should you choose to purchase a product or engage a service we discuss on this forum.
Howard & Francine
2017 Ford F-350 DRW, '19 315RLTSPlus
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Originally posted by howson View Post
Thanks, Keith--obviously I'm not very knowledgeable about these CPAPs. The OP should be aware that regardless of the voltage source, according to the manual the typical consumption is 57 watts (which doesn't change just because a different adapter is used) so your input that more batteries are needed is accurate.
zimdavid There is another possible option. Some brands offer a separate portable battery bag. They are very pricey If I remember correctly. It has a Lithium battery, fast charger and cables - but for the price you could easily get 2 more battery's. There are some neat battery trays for the front of your trailer with from 2 to 4 battery capacity. With the pass through under your bed it would be simple to wire in a couple of power point plugs.
Here is my install on my 5th wheel - yours would be simpler. https://gdrvowners.com/forum/operati...wer-in-bedroom
Hope this helps2018 Reflection 150 Series 220RK 5th whee, Star White 2022 F350 King Ranch CC Long bed (HAL) (CCC 4062lbs), B&W 25K OEM Companion,. SteadyFast system, Trailer reverse lights, rear receiver spare tire holder, storage tube, sumo springs, Victron MultiPlus 12/120/3000, Solar, Custom 6K axles upgrade, and other modifications.
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I have an older ResMed S9 CPAP machine. The power cord contains a 120 volt to 24 volt power supply. I have plugged mine into a watt meter and it draws just under 20 watts even with the Humidifier on. I will be getting the newer AirSense 10 unit for this season, but ResMed is not able to give me any operating wattage on it. My plan is to change my current 12 volt deep cycle battery to two 6 volt golf cart batteries in series. I will also install a 1000 watt inverter in the front pass through and run a 120 volt outlet to the bedside. I am thinking the batteries should last at least the whole night, if not several depending on water pump and lights usage. If need be, I will get a portable 100 watt solar panel and charge controller for my batteries.
Any thoughts or ideas on this plan? Math is not my strong suit and I am trying to figure my total Ahr draw. The 6 volt batteries are 235 Ahr each, so i am assuming i will have about 115 to 117 Ahrs if i take them down to 50 %?
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Brian S
A constant 20W drain (20 watts per hour) will consume about ~2 amp hours (aH) from the batteries (20W/12V). Over a typical 10 hour period that's ~20aH. That does not account for power drawn from the batteries for the furnace, refrigerator, and any other 12v appliance that's going to drain power.
So it looks like (on paper) that the 6V golf cart battery setup will work just fine, but run those 6v batteries to depletion due to an oversight and their ability to hold and dispense a charge will rapidly decrease. If you're considering new batteries, give the lithium alternatives a hard look.
LifePO4 batteries (lithium) have a high initial price, but their long-term cost has been proven to be less. There are multiple YouTube videos and blog websites you can search for that spell out the benefits. Of course there's more usable power, too. Back-of-the-napkin configuration: a single100aH Battle Born (or equivalent), a compatible charger, battery monitor and a small generator is a setup that may meet your needs. Go with two 100aH Battle Borns and you'll almost double the usable available power available to use (versus the golf cart batteries).
If you go with the golf cart batteries, at minimum get a quality battery monitor: https://gdrvowners.com/forum/operati...-do-i-need-one
TucsonJim has an excellent primer on batteries in the Reference Material section if you haven't seen it: https://gdrvowners.com/forum/operati...ithium-battery
Guest (Jim) and Yoda (Keith)?
HowardForum moderators are not GD employees--we are volunteers and owners presumably just like yourself. Unless specifically mentioned otherwise, we have nothing to gain should you choose to purchase a product or engage a service we discuss on this forum.
Howard & Francine
2017 Ford F-350 DRW, '19 315RLTSPlus
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Originally posted by Brian S View PostI have an older ResMed S9 CPAP machine. The power cord contains a 120 volt to 24 volt power supply. I have plugged mine into a watt meter and it draws just under 20 watts even with the Humidifier on. I will be getting the newer AirSense 10 unit for this season, but ResMed is not able to give me any operating wattage on it. My plan is to change my current 12 volt deep cycle battery to two 6 volt golf cart batteries in series. I will also install a 1000 watt inverter in the front pass through and run a 120 volt outlet to the bedside. I am thinking the batteries should last at least the whole night, if not several depending on water pump and lights usage. If need be, I will get a portable 100 watt solar panel and charge controller for my batteries.
Any thoughts or ideas on this plan? Math is not my strong suit and I am trying to figure my total Ahr draw. The 6 volt batteries are 235 Ahr each, so i am assuming i will have about 115 to 117 Ahrs if i take them down to 50 %?
Hope this helps
Keith2018 Reflection 150 Series 220RK 5th whee, Star White 2022 F350 King Ranch CC Long bed (HAL) (CCC 4062lbs), B&W 25K OEM Companion,. SteadyFast system, Trailer reverse lights, rear receiver spare tire holder, storage tube, sumo springs, Victron MultiPlus 12/120/3000, Solar, Custom 6K axles upgrade, and other modifications.
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Originally posted by howson View PostBrian S
A constant 20W drain (20 watts per hour) will consume about ~2 amp hours (aH) from the batteries (20W/12V). Over a typical 10 hour period that's ~20aH. That does not account for power drawn from the batteries for the furnace, refrigerator, and any other 12v appliance that's going to drain power.
So it looks like (on paper) that the 6V golf cart battery setup will work just fine, but run those 6v batteries to depletion due to an oversight and their ability to hold and dispense a charge will rapidly decrease. If you're considering new batteries, give the lithium alternatives a hard look.
LifePO4 batteries (lithium) have a high initial price, but their long-term cost has been proven to be less. There are multiple YouTube videos and blog websites you can search for that spell out the benefits. Of course there's more usable power, too. Back-of-the-napkin configuration: a single100aH Battle Born (or equivalent), a compatible charger, battery monitor and a small generator is a setup that may meet your needs. Go with two 100aH Battle Borns and you'll almost double the usable available power available to use (versus the golf cart batteries).
If you go with the golf cart batteries, at minimum get a quality battery monitor: https://gdrvowners.com/forum/operati...-do-i-need-one
TucsonJim has an excellent primer on batteries in the Reference Material section if you haven't seen it: https://gdrvowners.com/forum/operati...ithium-battery
Guest (Jim) and Yoda (Keith)?
Howard
I agree that a lithium battery(s) is by far the best option. The issue I had with my OEM flooded lead acid battery was to listen to the generator 4 hours/day since this battery type will only accept 10amps. So discharging a FLA battery to 50% with heat on only during sleeping with the 75ah battery would give me around 37 ah to charge the next morning. As a result, the battery had to be charged every 9 hours for almost 4 hours. Painful! Charging at 10 amps while other items are running resulted in two two hour charge intervals daily while listening to chitty chitty bang bang.
Now take my 100ah lithium battery from AIMS. I can run my rig with heat on and use approximately 45% of its capacity in 24hrs. Since the dedicated lithium charger will put out 60 amps, the battery will fully charge while running the generator each morning to operate a coffee pot. So roughly 40 minutes or so later and the battery is fully charged. I cannot state what amperage two 6v batteries will accept but they will not come close to a lithium battery that can take up to 1C which is 100amps if you wished to push it this hard. Most of us us 0.5C to increase battery longevity.
Hope this helps.
Jim
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Thanks Guys for all the great information! I know the Lithium is probably the best route to go ultimately, but the batteries alone are going to be over $1200 each here in Canada! Then i need to change the charger and everything as well. I think the 1000 watt inverter will be overkill too, but I think using it at 100 watts or less at a time will prolong its life too. I am also going to install a 12 volt battery monitor to keep an eye on the battery levels.
Boondocking is something totally new to us! We have always used full hook-ups in the past. Our new 2600RB will be a whole new experience this year and since we don't really know how it will go, this is a first step for us.
As for the CPAP machine, the 20 watts was at 120 volts, not 12 volts. Won't that make a big difference? Also, my machine runs on 24 volts, not 12 volts, so i am not sure how a car charger would work? My power cord steps the 120 volts AC down to 24 volts DC.
I also have a 3000 watt inverter generator that is also new this year. I had a 1200 watt open frame generator in the past, but never used it for the RV. I was going to....until we got the 3000 watt unit.
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