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 > Your search for posts made by 'S Davis' found 97 matches.

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RE: Lance TC - lithium - DC-DC charger question

I use a 50 amp Redarc dc/dc charger on my 2019 Chevy (this system is in the rear of the crew cab) charging a pair of 280ah LifeP04, I ran a set of 1/0 DLO cables from the fuse block on the secondary truck battery to a set of 600amp buss bars in the cab and from the buss bars to a lift gate plug in the bed. I can either power the plug from the truck alternator( I plan on another dc/dc charger in the camper) or the 560ah battery bank. My truck has a high output alternator, it has the snowplow prep option with a 220amp alternator.
S Davis 05/16/22 11:00am Truck Campers
RE: AC Quits Blowing Cold after a few minutes

Be careful venting refrigerant, you can get a hefty fine.
S Davis 05/02/22 11:02am Tech Issues
RE: GM buying back 6.6L Duramax

Well I just started having coolant issues with my 2019 with 40,000 miles , I need to change the coolant tank and see if the low coolant message goes away. All they mentioned was the L5P so about five years of production.
S Davis 04/17/22 11:06am Tow Vehicles
RE: Not the cells that fail it is the battery Management System!

The thing I like is they will take every amp I throw at them until fully charged unlike other chemistries that charge slower at the top Except that 100% state of charge is NOT a goal for li. I didn’t say 100% state of charge, i said fully charged. Maybe I consider mine fully charged at 90%. You may wish to consider 85% instead of 90% if you want maximum cycles. It doesn't matter to me as Li are not in my temperature zone. The manufacturer specs are 10% to 90% SOC for 3500 cycles, that is in a compression fixture.
S Davis 04/10/22 01:43pm Tech Issues
RE: Not the cells that fail it is the battery Management System!

The thing I like is they will take every amp I throw at them until fully charged unlike other chemistries that charge slower at the top Except that 100% state of charge is NOT a goal for li. I didn’t say 100% state of charge, i said fully charged. Maybe I consider mine fully charged at 90%.
S Davis 04/10/22 12:24am Tech Issues
RE: Not the cells that fail it is the battery Management System!

Every time I see a thread like this, I go give my 6 volt, wet cell, GC batteries a hug. No BMS. No DC to DC charge to protect my alternator. No worries about ambient temperature. The draw back is having to check the water levels twice a year. Sent from my flip phone............. Richard I have four lightly used Trojan T-105s I can’t find a home for.
S Davis 04/09/22 04:27pm Tech Issues
RE: Not the cells that fail it is the battery Management System!

The thing I like is they will take every amp I throw at them until fully charged unlike other chemistries that charge slower at the top, oh and the weight I have 500ah of usable capacity at a little over 110lbs.
S Davis 04/09/22 04:20pm Tech Issues
RE: Finding a 3500 series truck to test drive....

I test drove my 2019 Chevy on the 11.5 hour drive home, Idaho was the closest I could find a long bed diesel in white. Can’t imagine trying to find one now.
S Davis 04/09/22 01:35pm Tow Vehicles
RE: Parallel different brand lifepo4 batteries together?

I think it has more to do with internal resistance of the batteries, if different they will charge and discharge at different rates. You try it and check each battery with a amp meter and see if they charge and discharge at the same rate.
S Davis 04/09/22 01:26pm Tech Issues
RE: Not the cells that fail it is the battery Management System!

I ended up building my own but I am an HVAC/Electrical contractor with over 30 years in the trades. If buying off the shelf I would make sure the battery is serviceable, no welded buss bars and you could take all the connections apart to service/replace them or the BMS. The cells could last 15-20 years BMS and terminal connections not so much, if the warranty Is done or the company is out of business you at least have an option of repair.
S Davis 04/09/22 01:16pm Tech Issues
RE: Not the cells that fail it is the battery Management System!

This is very helpful Don, thanks for posting. I have been trying to decide whether to buy bats with built in BMS' or buy 4 cells and an external BMS. I have only seen a couple of assembled batterys that can be easily opened and they are much more expensive and have no other attributes - you're just paying for the case. I think this makes the decision for me. Another benefit of stand alone BMS' is they tend to more often have better temperature protection and blue tooth. I can also over-size the BMS to head off trouble. That is where I ended up to, I have put together four 12 volt 280ah batteries, I am using two for a 3000 watt inverter on my work truck each has a 250amp BMS. I think I have about $1100.00 into each battery. Battery bank
S Davis 04/08/22 11:43am Tech Issues
RE: Aquahot smokes after service

Smaller motor could make less air and make the unit run rich causing smoke and soot. Or he could have used the wrong fuel nozzle and cause the same issue. You need someone that knows that unit and has the correct parts.
S Davis 04/04/22 09:11pm Tech Issues
RE: Aluminum or Plastic aux fuel tank

I just got a ATI-TTR51, I wanted to take up as little space as possible. It is bolted in but not hooked up yet. It takes about 9.5” of bed length but is still 51 gallons. ATI TTR51
S Davis 03/21/22 10:57pm Tech Issues
RE: Lithium batteries and alternator protection.

I have monitored alternator voltage on all my trucks and they never have gone below 14.2, my 2013 used to run a little higher at about 14.4. Same voltage when I start the truck and the same voltage over a seven hour drive. I have a volt meter on the dash.Still not an issue for a truck charging a trailer LFP through the 7-pin connector. I agree, depending on the voltage drop in the 7-pin circuit. You could still over charge the LifeP04 if the 7- pin doesn’t have enough voltage drop. What I don’t agree on is the blanket statement that most all newer vehicles have smart alternators systems. If the Chevy diesels have it my last two trucks have been broken.
S Davis 03/20/22 05:38pm Tech Issues
RE: Lithium batteries and alternator protection.

Also 13.2V would not be a issue for me as it indicates a charged battery and the alternator is only supplying chassis and converter loads. A higher voltage indicates the chassis battery is drawing amps so at least the DC-DC converter has less conversion losses. Almost all vehicles for the past 15-20 years or so, use some kind of a smart charging system. The voltage from the alternator is controlled by the engine computer and can vary over a wide range. Not on 2009, 2013, 2019 GM 2500HD diesels, my last three trucks all have had steady voltage at about 14.2 no matter what. They must be in the almost none category. One of my Redarc 50 amp chargers pulls 50 amps from the alternator and output is about 46 amps to the batteries, so on Redarc it looks like the rating is what is pulled from the alternator. Im not sure when GM started doing it but your 2013 and 2019 should have smart altanators, but may not. you would have to look for the shunt as GM did it differently and it should be part of your negitive batery post atachment. GM uses a shunt system whil ford uses a two wire bus.. as well other things might be different as in the voltage setting and such but ventualy when your battery is full in your truck and if your not using a ton of other power hungry stuff it will go down to a maintance voltage. this is to both give longer life to the altanator and the batteries. as for dc to dc chargers a lot of the input output power descrepencies are from wire size also. I have monitored alternator voltage on all my trucks and they never have gone below 14.2, my 2013 used to run a little higher at about 14.4. Same voltage when I start the truck and the same voltage over a seven hour drive. I have a volt meter on the dash.
S Davis 03/20/22 11:10am Tech Issues
RE: Lithium batteries and alternator protection.

Also 13.2V would not be a issue for me as it indicates a charged battery and the alternator is only supplying chassis and converter loads. A higher voltage indicates the chassis battery is drawing amps so at least the DC-DC converter has less conversion losses. Almost all vehicles for the past 15-20 years or so, use some kind of a smart charging system. The voltage from the alternator is controlled by the engine computer and can vary over a wide range. Not on 2009, 2013, 2019 GM 2500HD diesels, my last three trucks all have had steady voltage at about 14.2 no matter what. They must be in the almost none category. One of my Redarc 50 amp chargers pulls 50 amps from the alternator and output is about 46 amps to the batteries, so on Redarc it looks like the rating is what is pulled from the alternator.
S Davis 03/13/22 11:55am Tech Issues
RE: Redarc 40 amp DC to DC Charger issue

Forgot to mention this previously. Something that needs to considered when electing to turn on a dc to dc charger based on ignition voltage (vs. alternator output voltage) is potentially reduced current to the starter while starting the engine. As soon as the ignition is turned on, a 40a dc to dc charger could be drawing as much as 60a from the battery. On some vehicles that 60a reduction could impact starter performance---especially in extreme cold/hot weather conditions. As I recall there is a delay from when the ignition is activated to when the charger passes current. Delay is about 30 seconds and then it ramps up the amps over about another 30 seconds.
S Davis 01/22/22 11:08am Tech Issues
RE: Redarc 40 amp DC to DC Charger issue

If it’s working no reason to change it I just wanted to relay my experience.
S Davis 01/21/22 03:08pm Tech Issues
RE: Redarc 40 amp DC to DC Charger issue

I would disconnect your blue trigger wire and see if it will work sensing the alternator voltage, less chance of drawing down your starting battery. Again that was the original configuration and it didn't work. The charger stayed active. I'm constantly monitoring my battery shunt and I have power pack to jump start the battery, generator, erc. It's fine. Ok no problem, I would check again. On mine it takes 30 sec to 60sec to turn off after the ignition is shut off. It freaked me out at first because I thought it was not turning off. I I think takes a little bit for it to sense the voltage drop.
S Davis 01/21/22 11:27am Tech Issues
RE: Redarc 40 amp DC to DC Charger issue

I would disconnect your blue trigger wire and see if it will work sensing the alternator voltage, less chance of drawing down your starting battery.
S Davis 01/21/22 10:52am Tech Issues
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