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 > Your search for posts made by 'S Davis' found 67 matches.

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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
RE: Redarc 40 amp DC to DC Charger issue

Oh ok mine is not triggered by the ignition, it is sensing voltage to trigger it on and then after about 30 seconds slowly ramps up the amps. I wonder if you got a mislabeled 50 amp unit?
S Davis 01/20/22 01:50pm Tech Issues
RE: Redarc 40 amp DC to DC Charger issue

Maybe it is wire size, I use 1/0 DLO cable rated at 270amps so I don’t have much voltage drop.
S Davis 01/20/22 11:02am Tech Issues
RE: Redarc 40 amp DC to DC Charger issue

Something sounds off, I have the 50amp Redarc and it draws exactly 50amps from the alternator/truck battery and output is about 47amps to the batteries.
S Davis 01/19/22 08:23am Tech Issues
RE: Alternator and LiFePo battery question

The Redarc also has an MPPT controller. I'm planning to add 600 watts of solar. I upgraded to LiFePo to charge the big batteries on our E-mtbs. Between the driving and solar I think we'll be fine. I am going to add a second dedicated alternator and plan to have three of the 50 amp Redarc, two on the truck for two 280ah LifeP04 and one in the truck camper to charge one 280ah LifeP04. I talked to Redarc and they said you could parallel up to four. why would use 2 280ah for the truck portion? Installing a 2800 watt inverter for work tools on remote job sites.
S Davis 01/10/22 12:17am Tech Issues
RE: Alternator and LiFePo battery question

The Redarc also has an MPPT controller. I'm planning to add 600 watts of solar. I upgraded to LiFePo to charge the big batteries on our E-mtbs. Between the driving and solar I think we'll be fine. I am going to add a second dedicated alternator and plan to have three of the 50 amp Redarc, two on the truck for two 280ah LifeP04 and one in the truck camper to charge one 280ah LifeP04. I talked to Redarc and they said you could parallel up to four.
S Davis 01/09/22 11:39am Tech Issues
RE: Alternator and LiFePo battery question

@ortfun What size wiring from your alternator? I have about 10’ of 1/0 DLO cable that might make a difference. The Redarc does boost the voltage to 14.5 so I think that is the 3amp difference.
S Davis 01/08/22 01:06pm Tech Issues
RE: Alternator and LiFePo battery question

One thing with the DC-DC is you can set its output voltage and do the same with your solar controller's to get them about the same so they add their amps while you are driving. With ordinary alternator charging in newer vehicles, the alternator voltage gets lower than the solar's, and you mostly only see what the solar is doing. On my 2019 Chevrolet 2500HD the charging voltage stays at a constant 14.4 it never changes, so newer vehicles are not all the same.
S Davis 12/31/21 12:23pm Tech Issues
RE: Alternator and LiFePo battery question

I have a Redarc 40 amp DC to DC charger but apparently there is a solenoid that sends current from my alternator to the house battery when the ignition is on. I was unaware of this when my mechanic installed the charger. I just finished a 1500 mile road trip and was seeing a lot more than 40 amps on my shunt while driving. Fortunately I have a very robust alternator. I just found out about this solenoid so I will try and straighten it out so only the DC to DC charger is charging the battery. Not clear how it was done from that. If part of the plan was to isolate the LFP from the alternator in case of way high draw from low SOC LFP (which is in dispute how much of a threat that is, but let's say it is valid for now) then leaving the OEM charging in place was wrong. Next, the DC-DC itself will draw more than its 40 amps output as its input. Depending on the wiring from engine batt to DC-DC, if long and thin, could be 60 amps. If short and fat could be 45 amps. So you need to pick the DC-DC output amps size to go with what your alternator can do, which depends on the input amps that you can only guess at. If the amps are too high you could perhaps fatten that wiring to bring it within spec, or else before buying the DC-DC just assume 50% higher input over the output amps and match that to the alternator amps The draw on my 50amp Redarc is 50 amps from the truck and around 47 amps charging to the batteries, so at least on the Redarc the rating is the draw on the alternator. This is charging a 280ah LifeP04, I have two but charge them separately.
S Davis 12/31/21 12:17pm Tech Issues
RE: Inverter AGM questions

A nice clean install. Thanks been planning for a while, got one of the battery heaters installed. Battery Heater
S Davis 12/04/21 07:27pm Tech Issues
RE: Inverter AGM questions

Made some more progress, buss bars, one of the dc/dc chargers. Buss bars/ charger
S Davis 11/29/21 07:23pm Tech Issues
RE: Lifepo4 cold temp cut off 23F or 32F?

I am heating my two 12v 280ah batteries, will be using a separate small agm charged by the trucks alt. I don’t plan on letting them get below 40 under normal conditions but will probably test after they cold soak once for a idea just Incase. Twin 280ah LifeP04
S Davis 11/22/21 09:34pm Tech Issues
RE: Fraserway RV Abbotsford - Massive fire, 100's of RVs

We saw the smoke plume from 60 miles south of the border, pretty crazy with all the water we have everywhere.
S Davis 11/18/21 08:38pm General RVing Issues
RE: Inverter AGM questions

Ok got batteries, I have spent the last two months putting together two 280ah LifeP04 batteries, I just got them mounted in the truck today. I have temporarily hooked up my compressor frig and 300 watt inverter for small loads. I removed all the buss bars/ breakers and switches from the enclosure I had in the bed of the truck and can now put the system together in the cab. And now I can get the four Trojan T-105 out of the bed of the truck and find them a new home. Twin 280ah LifeP04 cells.
S Davis 11/14/21 06:33pm Tech Issues
RE: lithium question

EVE LifeP04 cells are 10% to 90% for 3500 cycles, they should still have 80% capacity at that point. If so these should outlast me. I think your missreading that a bit.. the industry standard is that the cycles they list are based off a 100% usage. they recomend 10-90% use range and that will extend your cycle life possibly up to 5000-7000 cycles, before you reach that 80% threshhold. then that 80% could be maintained for another 10 years or longer, if you treat them good. Steve Yes you are correct, that is their recommendation for max cycles. Pulled this from the spec sheet, they consider a cycle from fully charged to 2.5 volt cut off. A fte r sta nda rd char ged and 30 mins res t, discharge to 2.5V cutoff with the current of 1.0C(A) at (25±2) °C, and then start the next cycle, end with the capacity decrease to 80% of the initial capacity. The number of cycles is defined as the cycle life of the battery.
S Davis 11/07/21 10:23am Tech Issues
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