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 > Your search for posts made by 'mapguy' found 40 matches.

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  Subject Author Date Posted Forum
RE: RV Command center panel

Raspberry Pi seems the way to go. Haven't messed with it, but seems pretty easy to grasp from what I've read Raspberry Pi is the rage in single board computers right now but IMO the Beaglebone series of single board computers is a little more user friendly along with being full open source unlike the Raspbery Pi and the Arduino based products. yes, we are just starting to see system implementation in the RV world of a canbus system - it is called RV-C and has its unique standards with potential to use multiple canbus library's for custom implementations of all types.
mapguy 06/22/17 12:44pm Do It Yourself Modifications and Upgrades (DIY)
RE: RV Command center panel

Raspberry Pi seems the way to go. Haven't messed with it, but seems pretty easy to grasp from what I've read Raspberry Pi is the rage in single board computers right now but IMO the Beaglebone series of single board computers is a little more user friendly along with being full open source unlike the Raspbery Pi and the Arduino based products.
mapguy 06/22/17 12:40pm Do It Yourself Modifications and Upgrades (DIY)
RE: Sailun Tires ?

Mapguy where do we find the load & inflation guide for Sailun tires? Thanks From Sailun -request it through their website. http://www.gosailun.com/MRT/Contact
mapguy 06/21/17 10:16am Fifth-Wheels
RE: Sailun Tires ?

second chance - Thanks for sharing your results running at 105 psi. Nothing better than hearing what has actually worked long term in the real world (not just inflation tables and charts). I appreciate it. Load and inflation chart published by Sailun plus ideally the weights of the individual trailer wheel positions allows a real world starting point for reduced by load inflation level. Trailers usually need 5 to 10 psi above the table.
mapguy 06/20/17 07:55pm Fifth-Wheels
RE: Gut check lithium 4S6P battery connections

picture of 4p4s setup from https://www.entropypool.de/2015/05/15/designing-a-lifepo4-battery-system-part-1-lifepo4-cells/ https://image.jimcdn.com/app/cms/image/transf/dimension=495x1024:format=jpg/path/s4d03b84c5c68cdfd/image/i39e4811875dac5b6/version/1448213610/image.jpg width=640
mapguy 06/18/17 12:40pm Tech Issues
RE: AirSafe 25K hitch problem

Was it air line parts/fittings you replaced? If so, did you trim the ends of the air line square without crushing the tube? Air brake tube needs very square end cuts without crushing to seal reliably. This doubly important with push lok type fittings.
mapguy 06/13/17 03:47pm Toy Haulers
RE: That Fuel Station Issue Again

EZ-8 or EZ-8RV model pump? Just went through this issue on my 2008 Rage'n. Make sure on the model by checking the serial number tag on the pump. Parts for EZ-8 are easy to find and reasonably priced at multiple places. EZ-8RV parts are available from one retail source. Price seems high in comparison. That source is Affordable RV located in Hesperia, California.http://www.affordablervhd.com If you are a qualified reseller, parts maybe available thru ECI Fuel Systems. ECI is the sole distributor of the Great Plains Industries EZ-8RV model pump. http://www.ecifuelsystems.com BTW, this is the first pump problem since buying the trailer new. The gear problem showed up after a long period of the trailer sitting with a full tank of treated non ethanol fuel. Got the pump to work fine with a little gear sanding. Not sure how long the repair will last so ordered a kit from Affordable RV.
mapguy 06/12/17 07:12pm Toy Haulers
RE: Gut check lithium 4S6P battery connections

Sometimes the simplest communications on here become so confusing. Agree
mapguy 06/10/17 11:30am Tech Issues
RE: Gut check lithium 4S6P battery connections

Why not just make one 12 volt battery? 6 cells in parallel 4 times? That would be a lot more interconnects. Don't understand you comment when I view the following picture from this post: http://www.rv.net/forum/index.cfm/fuseaction/thread/tid/29165028/gotomsg/29302293.cfm#29302293 http://photos.imageevent.com/2oldman/rvnetlinks/websize/inside3.jpg width=640
mapguy 06/09/17 01:58pm Tech Issues
RE: Gut check lithium 4S6P battery connections

Think you want to do 6p4s. What cells and BMS are you considering? Remember RV usage is similar to house battery systems on boats. Not really similar to EV battery systems due to the constant loads and multiple charging sources. Take a look at the following web pages: http://www.pbase.com/mainecruising/lifepo4_on_boats https://www.entropypool.de/engineering/ http://nordkyndesign.com/category/marine-engineering/electrical/lithium-battery-systems/
mapguy 06/09/17 09:46am Tech Issues
RE: Li batteries at 48vdc

No not drop in, his is special order Not too many RVs use 48v system Sold as a drop in 48v battery pack comprised of cylindrical cells and battery monitor system.
mapguy 06/01/17 07:16pm Tech Issues
RE: Li batteries at 48vdc

Floating or storing LifePo4 cells -pouch, prismatic, cylindrical, at 90-100% is harmful to long term life.Yeah.. it's quite the problem when the mfr recommends a float voltage. That is why I asked about the data sheet for the cylindrical batteries used within your battery pack. It is these components that need the proper discharge and charge procedures. Pack level volts are secondary to individual cell volts in regard to knowing if you are properly charging/discharging within the knees of the voltage curve. Sometimes you have to read between the lines - if Relion said "no float", their battery pack is not truly a drop-in replacement for the RV market. There are white papers that quantify the capacity degradation done by floating at full or nearly full.
mapguy 06/01/17 05:32pm Tech Issues
RE: Li batteries at 48vdc

You might want to quiz your supplier as to the need to float..They say it's not necessary. I cannot set its duration. Sorry don't want to sound like a broken record on the float issue.... Floating or storing LifePo4 cells -pouch, prismatic, cylindrical, at 90-100% is harmful to long term life. Harmonizing charging sources is the great challenge "right now" to implementing a LFP system. Typical RV is going to have at least 2 charge sources and could have 4 or more. All these charge sources need to be controlled properly to ensure a long service life without severe capacity degradation. Look at this link for some info in layman's terms. This is a marine electrician that has been doing LFP on boats, including his own, for a while now. http://www.pbase.com/mainecruising/lifepo4_on_boats
mapguy 06/01/17 03:53pm Tech Issues
RE: Li batteries at 48vdc

Using less than max amperage then is a vital component of the charging protocol? A parallel would be to recharge a flooded battery with say 20 amps and when the 20 amperes on the ammeter sags then float is initiated? This then would be is a charging algorithm. Solar or AC, is this algorithm available in a charger or controller? Lithium advertisements seem to go really light on what is needed charger wise. The intercell management protects the battery cells. What protects the bank? 2OLDMAN's battery pack data sheet is here: http://cdn2.hubspot.net/hubfs/441554/lithium-spec-sheets/RB48V100_Spec_Sheet.pdf?t=1495820355718 Without more information on the actual cylindrical batteries used in the battery pack -analyzing charge needs is very difficult. Personally I would have great concerns over the high and low shut down points on the data sheet being effective to prevent damage to the individual cells based on my research-both of installs and white papers. Several clear messages I have extracted from the successful users in the marine house bank usage - is never float the battery with voltage, like a LA battery likes. No need to charge full every charge cycle. Yes, occasional top off with immediate use is needed to prevent the batteries from developing a memory of partial charge. Stay out of the dramatic curve on both ends(Knees) - charge or discharge. Be conservative in charge / discharge cycles for the needed long life for a positive cost benefit life cycle. The batteries themselves are simple but the control systems are not and must be set up to prevent over/under charging and prevent any real amount of float time. The control systems must harmonize all the charging sources to prevent inadvertent overcharge, plus warn/disconnect at the proper pack level voltages that the BMS does not protect for in this type of battery pack. Charge > Use - Charge > Use. Discharge to ~50% DOD for any storage time.
mapguy 05/31/17 10:16am Tech Issues
RE: Li batteries at 48vdc

As mentioned above What is the out put amps of the charger Vrs The output amps of solar approx 14amps?I'll pay more attention to that. What I don't understand is this: Why did the shore line charger need to be modified but the solar controller is fine? What is the difference? Not to sound to critical, but if you are still asking this question -your research before adoption of LIFEPO4 missed some real key points regarding the successful use in a fractional c usage application. All the important parts of house bank use of lifepo4 are detailed well in a monster thread on www.cruisersform.com.
mapguy 05/30/17 10:09am Tech Issues
RE: Li batteries at 48vdc

As mentioned above What is the out put amps of the charger Vrs The output amps of solar approx 14amps? IIRC you did not track amp hrs, only going by voltage, the AGMs May not have been reaching true full charge All I'm saying is there is more than one factor at play The new lithium battery is going to accept more amp hours than the old AGMs, Thereby appearing to take longer to reach full charge on solar Lifepo4 charging needs monitoring of the amps as much as the voltage. Full -even though you don't need to be full very often, is determined by the amp acceptance rate @ a specific voltage. Using voltage only will get into the "knees" of the charge/discharge voltage graph -causing slow but sure deterioration of your cells. Floating -in the Lead Acid sense of things is also a cell killer.... Best overall action with LifePo4 is >-charge>-discharge>-charge>-discharge. For LIFEPO4 to work and give long, stable service you need to forget the Lead Acid battery routines.....
mapguy 05/30/17 10:02am Tech Issues
RE: Solar/Inverter wiring

https://www.bluesea.com/products/category/18/BusBars Blue Sea products are good, but I like the VTE products better. https://www.vtewarehouse.com/content/electromech/busbar/terminal_busbars.php
mapguy 05/26/17 03:03pm Tech Issues
RE: To slide or not to slide, that is the question.

We've all been there!! ;) No , some of us are proactive with the purchase and use of an automatic sliding hitch.
mapguy 05/21/17 08:30am Fifth-Wheels
RE: TriMetric Serial Data

Got my first python script coded and running. This is on a raspberry pi and reading from the tm-2030. I tried to add the code to this message but it would not send. Anyone know to I can attach the code for some help in cleaning up the code. convert the text doc to an image format and post as a picture.
mapguy 05/19/17 03:18pm Tech Issues
RE: Other 12V Sources with a 24V-12V converter

IMO -the breakaway circuit is a life/safety device and redundancy to ensure it works when needed. Probably would maintain a separate 12v battery for breakaway and generator starting. Charge via truck and as needed with the dc-dc source you have. Another issue to consider is that taping the center cabling of the 24v bank for 12v creates a battery condition/soc monitoring nightmare as the in/out of energy is not so easy to capture. Battery balance could be affected by a 12v connection to the interior cabling. Yes, none of this is real simple, but you are already many levels beyond simple by the step up to use of a 24v battery system.
mapguy 05/04/17 09:38am Tech Issues
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