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 > Your search for posts made by 'otrfun' found 243 matches.

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  Subject Author Date Posted Forum
RE: Lithium battery alternator charging.

Nice overkill on the wiring. Well done.Thanks!
otrfun 04/10/21 04:24pm Do It Yourself Modifications and Upgrades (DIY)
RE: Lithium battery alternator charging.

We just installed a Renogy 40a dc to dc charger in our truck camper. Ran ~25 feet of 2 gauge cable (along with several 175a Anderson-type connectors) from the our Ram 3500's battery (used a 60a Zcase fuse) to the charger mounted inside the truck camper. Used the truck's frame for most of the neg run. With 2 GC2's discharged to 12.2v, get 40a of charge current with a 43a load on the alternator (.3v drop from alternator to charger). Pretty pleased with how this Renogy performs. For the heck of it we also turned on the 45a converter in our truck camper at the same time and managed almost 75a of total charge current. There's always lots of discussion about the potential dangers of overloading an alternator by direct-charging house batteries. Interesting to note that Larry at Lifeblue Batteries (and Starlight Solar??) said he's installed hundreds of alternator/house battery charging systems through the years using only a battery isolator. In all these installs he said he's never witnessed or had anyone report an alternator failure. Who knows, maybe this whole overloading an alternator thing is akin to many discussions about payload. Yes, with any given scenario the sky can fall, but how often does it?
otrfun 04/10/21 11:01am Do It Yourself Modifications and Upgrades (DIY)
RE: LFP on Shore Power with Inverter/charger?

When I called Battleborn a few months ago, they said it was ok to float their batteries for weeks/months at a time between 13.2 - 13.8v. They do not recommend floating their batteries at 14.4-14.6v for more than a few weeks. Interesting to note that Progressive Dynamic Lithium/LifePo4 converters are single stage 14.6v converters. Not a good match for BB for long periods of storage/non-use. We'll be upgrading to LifePo4 soon. Our plan is to just keep our OEM lead acid 3-stage Progressive Dynamic converter in our truck camper and use the Charge Wizard to manually select the appropriate charging stage (13.2v, 13.6v and 14.4v) for our LifePo4's.
otrfun 04/10/21 08:19am Tech Issues
RE: Roadmaster or Hellwig

We chose the Roadmaster over the Hellwig for our Ram 3500 SRW because it mounted to the axle housing in a more outboard, OEM fashion, at the bottom of the shock mounts. The Hellwig mounts more inboard with a clamp around the axle making it less effective IMO. We also installed lower Stable Loads (stainless steel versions). They offered some improvement in sag, handling, and even reduced sway slightly (at highway speeds)—-nothing dramatic. They work especially well when used in conjunction with slightly pressurized airbags.
otrfun 04/10/21 07:08am Truck Campers
RE: How to build a LiFePo4 battery bank.

Even if you used the same BMS and cell configuration for =>two parallel battery packs (to increase overall current), wouldn't you potentially run into charge/discharge balance issues between battery packs after a certain number of cycles? Talking about the same balance issues the BMS's are supposed to help prevent from occurring between the individual cells in each battery pack. If this did happen, one should be able to resolve it by top balancing the battery packs themselves, right?No. The two packs are in parallel, so they will always see the same voltages and will be inherently balanced (just like the 30 or so cells in parallel inside a battleborn stay in balance). Within the packs, the cells are in series and could get out of balance, but the balancer in each BMS will keep them in balance.Thx for clarifying. Makes sense.
otrfun 04/08/21 10:12am Do It Yourself Modifications and Upgrades (DIY)
RE: How to build a LiFePo4 battery bank.

Even if you used the same BMS and cell configuration for =>two parallel battery packs (to increase overall current), wouldn't you potentially run into charge/discharge balance issues between battery packs after a certain number of cycles? Talking about the same balance issues the BMS's are supposed to help prevent from occurring between the individual cells in each battery pack. If this did happen, one should be able to resolve it by top balancing the battery packs themselves, right?
otrfun 04/08/21 06:45am Do It Yourself Modifications and Upgrades (DIY)
RE: 2022 F350 on order

Almost ordered a 2021-2022 7.3 Lariat. Decided to hold out another year for the 2023. Odds are Ford will release their next gen HD's in 2023. Hoping the next gen HD's have substantially different front-end sheet metal vs. the new 2021-2022 F150. Not fond of the new F150 front-end.
otrfun 04/07/21 10:00am Tow Vehicles
RE: How to build a LiFePo4 battery bank.

. . . There is well supported and easy to use bluetooth enabled BMS available from Overkill Solar: Overkill 120A BMS Also available for much less from the manufacturer: LLT Power the OEM for Overkill Solar BMSOverkill BMS's seem to have a very good rep; however, to my knowledge they don't make BMS's larger than 120a. For those who have 2000-3000w inverters with 200-300a current requirements what options do they have? Daly makes a few 150-250a models, but they have a somewhat sketchy rep. I suppose one could parallel multiple Overkill 100-120a BMS's and LifePo4 battery packs.
otrfun 04/07/21 09:24am Do It Yourself Modifications and Upgrades (DIY)
RE: LifePo4 Voltage at .5C - .6C Discharge

. . . EDIT-- beware of the polarity with those kind of wire sets. They can reverse in the middle depending. (eg try to join two 12v plugs end to end and get the polarities right :( )Once these Anderson-type connectors (shown in Intinerant1's pic) are properly terminated/installed, it's impossible to get the polarity reversed after the fact. They only plug-in one way. We used 3 or 4 of the 175a versions for our dc2dc charger install. They're *very* rugged, well-built connectors.
otrfun 04/02/21 04:30pm Tech Issues
RE: Light weight 5th wheel hitch

This 5th wheel hitch only weighs about 80-90 lbs., disassembles easily, and costs less than $300. The top part of the hitch can easily be removed from the lower part. Just requires the removal of two pins. The top and bottom halves only weigh about 40-45 lbs. each. 40-45 lbs. is very manageable. We towed a 12k (loaded) 5th wheel cross-country several times with one with zero issues.
otrfun 03/31/21 07:04pm General RVing Issues
RE: Why do you Cummins guys want more gears

Our '16 Ram Cummins "performs" fine with a 6-speed. It rarely downshifts, even while towing. No real complaints. However, I recently drove a Ford PS and Chevy DM with the new 10-speeds. Hard not to notice how smooth and seamless the new trannys were. There may be more gears, but it seems like less. Is smooth and seamless necessary from a raw performance perspective, no. But, hard to argue with improved NVH. It's something even the average Joe would notice on a test drive.
otrfun 03/31/21 10:05am Tow Vehicles
RE: LifePo4 Voltage at .5C - .6C Discharge

Appreciate everybody's inputs. Always learning something new. Called LifeBlue (lifebluebattery.com) on Mon and inquired about the voltage drop with their 100ah LifePo4 battery while under heavy load. Surprisingly, he offered to test one and get back with me. Received an email yesterday with the results. With a fully charged battery, battery voltage was 12.8v at 80a, and 12.7v at 100a. Pretty impressive. Based on the graph FWC posted, I'd guess-estimate battery voltage while would drop to approx. 12.0v at 15% SOC with a 100a load.
otrfun 03/31/21 07:46am Tech Issues
RE: LifePo4 Voltage at .5C - .6C Discharge

Any idea what the under-load voltage during this flat period would be? I would hope LifePo4's could easily maintain at least 12.0v while under .5C - .6C discharge down to 20% SOC. I hear lots of discussion about LifePo4 high charge rates at a given charge voltage, but very little discussion about discharge voltage while under heavy load. Got to have both to make the battery productive.To answer this question - yes they should be able to maintain 12V under a < 1C load down ~10% SOC. Here is a typical discharge curve (multiply by 4 for a 12V battery): https://www.electriccarpartscompany.com/assets/images/c-ratedischargecurves-lifepo420ah32vpouchbattery.jpgOur two Costco GC2's are rated at approx. 200+ ah. However, I'd guess-estimate only about 30-35% (60-70ah) of that is accessible with a 125a load (true since new). The *battery* voltage drop while under this much load is just too high. Our inverter goes into low-voltage shutdown around 10.9v. FWIW, we only have a .15v - .20v voltage drop at 125a (battery terminal to inverter terminal). It would appear to be a very different story with the LifePo4's. For folks like us, who need access to 125a on a regular basis, we should be able to easily access 160ah (or 80% of the rated 200ah) of two paralleled 100 ah LifePo4 batteries while easily maintaining at least 12.0v while under a 125a load. If the graph that you posted is to be believed, it would seem two 100ah LifePo4's (i.e., Battleborn or Lifeblue) offer a huge performance advantage over our two GC2's.
otrfun 03/29/21 09:05am Tech Issues
RE: LifePo4 Voltage at .5C - .6C Discharge

Thank you, FWC! Very helpful. Been looking for a chart like this but couldn't find one.
otrfun 03/29/21 08:10am Tech Issues
RE: LifePo4 Voltage at .5C - .6C Discharge

Any idea what the under-load voltage during this flat period would be? I would hope LifePo4's could easily maintain at least 12.0v while under .5C - .6C discharge down to 20% SOC. I hear lots of discussion about LifePo4 high charge rates at a given charge voltage, but very little discussion about discharge voltage while under heavy load. Got to have both to make the battery productive.
otrfun 03/29/21 07:59am Tech Issues
LifePo4 Voltage at .5C - .6C Discharge

Our two GC2's (with 100% charge) drop below 12v while under a 100a - 125a load. When they reach 50% (at 100a - 125a), voltage drops into the low 11's while under-load. What kind of under-load voltage can I expect with two 100ah LifePo4's (paralleled) with a 100a - 125a load? At 100% charge? At 10-20% charge?
otrfun 03/29/21 06:54am Tech Issues
RE: Which E rated ties have the most weight capacity?

I will need to be replacing the tires on my 1 ton. I have noticed there is a bit of a difference in tire weight capacity ratings. I currently have Firestone Transforce that has 3680 lbs per tire. While looking at other tires, I have noticed some have as little as 3200 lbs per tire. Just curious if there is a tire that has a higher rating than the 3680 lbs??I'm guessing you have a 1-ton SRW with 18" or 20" tires. If you want a higher load capacity (>3680 lbs.) you'll probably need to upgrade to a slightly larger 295/70/18 tire. That'll net you a 4080 lb. load rating (129 load index). If you have 20" tires, you'll need to upgrade to a 295/65/20 tire (load index 129; 4080 lbs.). 18"/20" E-rated LT tires with load capacities/ratings above 3680 are very limited.
otrfun 03/27/21 11:11pm Tow Vehicles
RE: Adhesive for Securing Flexible Solar Panels

I used this to secure a flexible panel over the top of a deceased regular panel.Northern Lite uses 3M 4000 to seal a lot of their exterior seams at the factory. I've used it to reseal a few spots. Good stuff! Thanks.
otrfun 03/26/21 05:39pm Tech Issues
RE: Adhesive for Securing Flexible Solar Panels

VHB tape works well. Even if you just put it around the edge, there is a ton of surface area to work with, so it is relatively easy to get a good bond. The flexible panels are less durable than the rigid ones, but there are still good reasons to use them. If the panels you are looking at have grommets in the them you can also consider using glue on studs for the mounting with some Sika: https://duckworks.com/glue-on-studs/ http://www.weldmountsystems.com/products-fasteners-stainless-studs.php That way it is dead easy to replace the panel. Even if you just VHB around the edge of the panel, it will be a chore to remove them.Thanks! Appreciate the links for the glue-on studs.
otrfun 03/26/21 10:22am Tech Issues
RE: Adhesive for Securing Flexible Solar Panels

You might want to check this out ClickyThanks! Very helpful. I like the way he used those T-tracks. Allows for easy removal/replacement of the flex panels after the fact. He used Sikaflex and double-sided eternabond tape to attach the T-tracks to the roof. He also mentioned 3M VHB as another option. All 3 seem to be excellent adhesive solutions. The only question I would have is how well that polycarbonate corrugated material holds up to the heat.
otrfun 03/26/21 07:32am Tech Issues
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