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 > Your search for posts made by 'Rbertalotto' found 18 matches.

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  Subject Author Date Posted Forum
RE: DIY Li Battery Heater...A REAL TEST!

I'd have to measure it. But about 5" X 9".....
Rbertalotto 12/24/22 03:10pm Tech Issues
RE: DIY Li Battery Heater...A REAL TEST!

Great job! Very clean, well organized. For those planning on doing something similar, they'll find your pictures and videos very helpful. With all this cold weather we've had lately, it's a perfect time to test everything. One observation. Got to wonder if such a high wattage heating pad is necessary. 78w (6.5ah) is quite a high draw---especially if you're boondocking and trying to conserve. Realize you're trying to heat your 100ah lifepo4 cells indirectly, by heating the exterior plastic case. No doubt there's some inefficiencies at play here. We've found 4, 24w 80x100mm silicone heating pads (wired parallel/series) have the capability to heat our 200ah lifepo4 battery pack to 60f with an ambient of 0f. I'd guess they could probably maintain the cells at 35f with an ambient of -15f. Since the 4 pads are wired parallel/series they only consume 24w total (2a at 12vdc). This is a portable, completely self-contained battery with everything located inside an uninsulated Group 24 battery box. In cold weather we typically keep our lifepo4 cells at a constant 50f 24/7 so we can safely do .4c charges and .6c discharges at any time. We've found at 15f ambient, the heating pads (thermostat controlled) only draw approx. .75ah while keeping the cells at 50f. That's approx. the same overall draw as our inverter's parasitic, no-load draw. Agree on the pad size. I bought a smaller, 2amp pad to try in the truck with the one battery to see how it works. Stay tuned!
Rbertalotto 12/24/22 01:06pm Tech Issues
DIY Li Battery Heater...A REAL TEST!

DIY Battery Heaters...A REAL TEST!...got down to 7F degrees last night. At 7am the battery compartment is at 35 degrees. Controller is set to turn on at 35F and off at 38F........The batteries are at 90% on the monitor.....Working GREAT!... http://rvbprecision.com/rv-projects/lithium-battery-heating-project.html http://rvbprecision.com/rv-projects/lithium-battery-heating-project.html
Rbertalotto 12/24/22 05:51am Tech Issues
DIY Battery Heating Project...Update

A while ago I posted about my DIY Lithium Battery Heating system. So far, with temperatures at night reaching into the 20s (F), it has been working great. The batteries in the trailer have BMS with Bluetooth and it records the batteries average internal temperature. Staying around 40 degrees day and night. I wanted to know how often during the night the heating pad turned on. I installed a small LED on the outside of the trailer that illuminates when the heater is on. My "RING" camera security system records through the day and night and I can go back and review the video with a time stamp. I can see the light turning on and off. Last night it got down to 20F. The battery heater turned on for 7 minutes every hour +/-.....200ah batteries this morning are at 93%.....I'm very pleased with this performance... http://rvbprecision.com/rv-projects/lithium-battery-heating-project.html https://media.fotki.com/2v2eENKT5xeRUw.jpg
Rbertalotto 12/13/22 05:16am Do It Yourself Modifications and Upgrades (DIY)
RE: hot spots

We just got back from our trip and were up in Michigan UP and had plenty of areas with zero phone reception so no hot spot would work there. My advice is to see where you will be going a lot and if they have cell coverage, then you can go with what some of the other posters had mentioned. If there is no coverage then Starlink is about your only choice With the proper support devices, cell booster, mimo antenna or yagi antenna on a 16' painters pole, I've never not had cell reception. Even out in the desert or miles from civilization in a forest. There is always a cell tower somewhere. You just need to reach out to it.
Rbertalotto 08/26/22 06:53am Technology Corner
RE: hot spots

I have two Netgear Unite Explore hotspots. One on unlimited AT&T Mobley and one on T-Mobile 20g . these are vintage hotspots but have all the features I need and are still working 100% where ever I travel. They have great battery life, dual antenna input and excellent WiFi distance reception. Until Star link gets 100% up and running, ill keep using these devices.
Rbertalotto 08/25/22 05:16am Technology Corner
RE: Sumo Springs on my Toy Hauler

Have them on my truck & trailer, never a problem in 4/years As we sometimes say in the world of engineering...."PFM"!
Rbertalotto 08/22/22 06:35am Travel Trailers
RE: Ramp Trim

Can you post a picture of what you are talking about?
Rbertalotto 08/22/22 06:21am Toy Haulers
RE: My AGM to Lithium conversion

I used to say itinerant1 could have done equally well with 500 AH of AGMs by swapping them out as required. Now it is not so clear. The difference now is that he is taking advantage of the LFP high draw ability to run his air conditioner. It may be that the AGM option would only do that at higher SOCs while the LFP will at lower SOCs That and the shifting money side where replacement AGMs are going up in price is tilting the balance for his scenario IMO. How it plays out for recent RV LFPers will not be known for several years yet whether their LFPs were worth it vs another five years or so with another set of FLAs. considering a 80AH agm is over 450.00 bucks up here, and have been for over 4 yers now, I wouldnt say there was much of a cost risk. two of thoes in my camper would give me 160AH total for about 1K including taxes.. for 900 I did 300AH of LFP, droped from 130 to 49lbs, and was able to put it in the original battery space for the old camper freeing up my outside storage space which was taken up by the GC2's Steve The quicker recharge is well worth the investment for how I use the trailer. Now that Li price s have dropped dramatically, it might just be a "no brainer"....
Rbertalotto 08/22/22 06:12am Tech Issues
RE: My AGM to Lithium conversion

Itinerant1, A bit off topic, but how often does the generator get used? Once a month? more? less? My travel trailer is 99% used as a means c to an end. We almost never "camp"... we use it to attend events c where we are usually in a field or a parking lot with no shade. Having such great sun exposure I have not used a generator in four years! And we would be considered energy pigs. TVs on all the time. Computers running constantly. Charging cameras. Radios. Phones etc. Toast and Kureg coffee .....
Rbertalotto 08/22/22 06:07am Tech Issues
RE: My AGM to Lithium conversion

Rbertalotto, Very nice install. How did you decide on 13.5 for absorb charging? I called Renogy
Rbertalotto 08/22/22 06:00am Tech Issues
RE: Sumo Springs on my Toy Hauler

Two hundred mile trip yesterday ....and in a word..."FANTASTIC". Hard to believe how four urethane cylinders could improve the ride of the Tow Vehicle. No more jerky jerky when going over bridge expansions. No more bucking on washboard roads. This trailer is a toy hauler. Designer to carry a 1000 pound toy. When unloaded the suspension is very stiff. These Sumo springs smooth the suspension right out. I bought them from Amazon so I could return them if they did not work as advertised. But I'm starting to believe they might be the best $500 I've spent bon the trailer. All the internet engineers on this thread might be disappointed that they actually work. Sorry about that. As far as the post about them not contracting the chassis. Watch the video again. That picture was with the chassis jacked up and the whole spring system hanging. When you install them. You add spacers to maintain about 1/2" of compression. And as far as the comment about the Sumo springs bending or otherwise damaging the frame rails..... Totally ridiculous..... And I AM an engineer!:)
Rbertalotto 08/22/22 05:48am Travel Trailers
Sumo Springs on my Toy Hauler

I bit the bullet and spend $500 on four small rubber type things to augment the suspension on my Forest River RR19 toy hauler. Check out my you tube video here...https://youtu.be/xSDd5Se4z2E
Rbertalotto 08/21/22 07:03am Travel Trailers
RE: Poop Tote Carrier

Yes, the wheels simply pop off on this tote. Takes all of 15 seconds to put them on or off. As far as ground clearance. I relocated axles below the springs lastbyear. I have plenty not ground clearance.
Rbertalotto 08/14/22 05:14pm Do It Yourself Modifications and Upgrades (DIY)
Poop Tote Carrier

How do you transport your portable waste tank (Poop Tote). I really didn't want it tied on the back of the trailer and I certainly didn't want that nasty thing anywhere near living quarters. So I built a Poop Tote holder under the trailer....(sorry for the out of focus ) A video describes it best: https://youtu.be/gmVUOAVuKyA https://youtu.be/gmVUOAVuKyA
Rbertalotto 08/13/22 12:26pm Do It Yourself Modifications and Upgrades (DIY)
RE: My AGM to Lithium conversion

You say the recharge went from 60%-100% in 2.5 hrs at 30 amps. That is 2.5 x 30 = 75AH NOT 40AH. So again that 60% SOC must be wrong. You were down to about 25% SOC it seems from that. You might be right with this observation because I wasn't sure the Aili monitor was reading correctly at first. The only other variable that would affect this test was ambient temperature. The ICECO refrigerator was in a 55 degree garage only looking for 40 degrees. While with the AGM battery we were in summer outdoor heat of 80-85 degrees. I'm going to modify the article so there is no confusion. Thanks for your input....
Rbertalotto 04/15/22 11:14am Tech Issues
My AGM to Lithium conversion

Here is a quick article I wrote on my adventure going from AGM batteries to Lithium. http://rvbprecision.com/rv-projects/rv-lead-acid-agm-to-lithium.html http://rvbprecision.com/rv-projects/rv-lead-acid-agm-to-lithium.html
Rbertalotto 04/15/22 08:30am Tech Issues
Mobely / 3G shut down????

Any recent word on whether our AT&T Mobely units will work? I did a search but couldn't find any info. Mobely SIM in a Netgear hotspot......Will it still work. The little Icon shows 4G when I'm using it. Any info to share?
Rbertalotto 02/17/22 06:07am Technology Corner
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