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 > Your search for posts made by 'S Davis' found 95 matches.

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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
RE: lithium question

pianotuna it really seems you have a vendetta against LifeP04 batteries, I see people limiting their max charge Voltage. I have not tried that yet as I am still building my system.
S Davis 11/07/21 10:15am Tech Issues
RE: lithium question

You can. But you won't get the same number of cycles. There are a whole bunch of hoops to jump through if that is the goal.I am not sure I understand this statement. Charging to maybe 95% with 13.6 volts should yield more longevity in a lithium battery. For MAXIMUM cycles charge starting at 40% and stop charging at 90%. How do you manage that with a wfco? 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.
S Davis 11/05/21 07:34pm Tech Issues
RE: Camping 3 months with single 100Ah Lithium

How much lithium battery weight? They sure are technological future, but at present cost -not much economical. I am not young anymore (regardless how I feel mentalny) but I can still lift the battery from my sedan and put it into camper when going on vacation. Making it free power storage and less worry about battery sitting in my sedan for months without checking. The 280ah battery pack I just put together is a little over 50lbs. 280 ah battery pack.
S Davis 10/31/21 01:36pm Tech Issues
RE: Lithium cost keep dropping!

Just finishing up my first 280ah pack, still need to torque all the connections, trim the all thread and add acorn nuts. Eve 280ah 12volt cellNice job on those interconnects! We so wanted to go with 280ah cells for our truck camper. We reluctantly went with 200ah cells so we could fit everything in a group 24 battery box. Thanks, I am building three to start with two mounted in my truck where the inverter will be installed and one spare.
S Davis 10/23/21 11:17am Tech Issues
RE: Lithium cost keep dropping!

Just finishing up my first 280ah pack, still need to torque all the connections, trim the all thread and add acorn nuts. Eve 280ah 12volt cell
S Davis 10/22/21 06:54pm Tech Issues
RE: Lithium cost keep dropping!

Just got 12 EVE 280ah cells, had them in six working days from order. Building three 280ah packs. EVE 280ah cells
S Davis 10/08/21 01:12pm Tech Issues
RE: How to build a LiFePo4 battery bank.

My 12 EVE 280ah cells showed up today, building three 12v 280ah packs. I am going to run two in the truck with a spare on the shelf. EVE 280ah
S Davis 10/04/21 09:46pm Do It Yourself Modifications and Upgrades (DIY)
RE: Battle Born BB8D

Anyone have a reliable source for good cells and BMS? https://docantech.en.alibaba.com Ask for Jenny Wu. Shipping top quality EVE280 from Houston TX. I use this BMS. Limited to 120 amps but very solid reliability. https://overkillsolar.com/product/bms-120a-4s-lifepo4/ Ordered 12 cells yesterday, should have them in a week or two.
S Davis 09/26/21 07:55pm Tech Issues
RE: Battle Born BB8D

I will be using the 4/0 DLO cable they sent by mistake rated at 405amps for each 280ah battery.
S Davis 09/26/21 03:27pm Tech Issues
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