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 > Your search for posts made by 'S Davis' found 70 matches.

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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
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