08-08-2021, 07:30 AM (This post was last modified: 08-08-2021, 07:31 AM by tx2sturgis.)
(08-08-2021, 12:29 AM)Scott7022 Wrote: I get the unicorn and rainbows element of my point. We’re very unlikely to ever have grade A cells manufactured in the west. Lack of raw materials and an environmental protection agency.
I'm glad you mention this...so many Americans think (and are told) manufacturing in the west is lacking only because of cheap labor in the east.
That's only part of the story.
Strip mining raw materials from the land, and the toxin-laden manufacturing process of all the ores, metals, chemicals, etc used to actually MAKE high tech devices is extremely detrimental to the air, the land and the water. Its called NIMBY. Not in my back yard.
We Americans want that UnME-Phone 45 or sweet little 3900 amp ZingZong MPPT controller but we sure don't want the un-breathable air, un-drinkable water, and un-farmable land.
So..offshore it goes. When you have a nice shiny new blingy gee-gaw with the doo-dad options, I'LL BUY IT!
But please dump the remaining toxic sludge in the Indian ocean or the back alleys in Wuhan.
08-09-2021, 06:23 AM (This post was last modified: 08-09-2021, 06:42 AM by Gr8ful.)
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"If a law is unjust, a man is not only right to disobey it, he is obligated to do so." - Thomas Jefferson
Oh Little Willie...with the cutie-pie eye-make-up......he's a joke. First he says he can't recommend it, then he says he does recommend it, and oh yeah...buy it with his affiliate link and he makes a comish!
Sounds like he loved it to me, the only thing it didn't have was a low temp sensor which you can add if you'd have looked Amazon has them. As far as a guys eye make up to be honest I've never looked & don't care as I'm not turned that way but to each his own.
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"If a law is unjust, a man is not only right to disobey it, he is obligated to do so." - Thomas Jefferson
Can we talk about the utility value of a heat pad at an extra $100 per, when the batteries will be in a winter climate that is never below 32F when sufficient solar power is available to charge.
The lowest temp while dispersed this year to date was 37.9F, and if I hadn't been traveling to the southern border for dental work, I wouldn't have been there.
I don't winter in the RV that I want to upgrade. Charging during that time period would be only be to maintain the batteries, maybe LiFePo4 don't care about that when not under a load?
Maybe I should just go cheap for my first LiFePo4 bank, and find out the different ways that they can be not fit for purpose and/or ruined. Worked out with Lead Acid.
The AGMs are doing okay, but I need more AH on warmer days when the fridge cycles more. The bank area's footprint is what keeps me from adding another 100AH AGM, no room at the inn for the third AGM to lay its head down, and that would only gain 50AH. That is the reason for the sudden push towards LiFePo4.
Life Blue is temporarily sold out on all batteries.
as far as utube wanna be elctro folks will prowse is one of the more honest ones and my kinda of asshole
if you look you can find actual phd elctro folks on the tube but they talk in elctro maths
sure i'll take a couple lithiums if someone want to give them to me,just dont care about or use much electricity,waste not want not,still rolling with $150 100ah napa fake deep cycle,not enough but getting by
be carful with battery ah's,the more you have the more you can use the more you have to charge
$449 isn;t bad for a cold weather one. I was just ketting everyone know about the name brands on sale & the cheap ones too but I tend to get someones bloomers in a bunch everytime. It's getting as bad as the other forum.
"If a law is unjust, a man is not only right to disobey it, he is obligated to do so." - Thomas Jefferson
How much solar do I need? Enough to replace the power that you use. This goes even for lithium that does not have to be charged back to 100% all of the time. Do not cover your needs and eventually you will simply run out of power without a alternate source of charging.
First you figure it out on a daily basis and then consider how many days that you may be without sunshine within the limitations of your roof. Then you consider the resistance of your battery bank. A small array on a big bank drawn down will get hung up around 13.1 volts because it can't overcome the resistance of the batteries being charged. I can't speak for lithium but it is true for marine, AGM and especially 6 volt banks which have the most resistance of all.
A member on another forum was the first I heard mention the 1 watt per Ah of battery rule of thumb. It's become a given except the rest of the formula is that is what you need to equalize a battery at 77 degrees. The formula should be 2 watts per Ah or 1 watt per usable Ah at the least.
(08-09-2021, 04:38 PM)Wayne49 Wrote: Can we talk about the utility value of a heat pad at an extra $100 per, when the batteries will be in a winter climate that is never below 32F when sufficient solar power is available to charge.
The lowest temp while dispersed this year to date was 37.9F, and if I hadn't been traveling to the southern border for dental work, I wouldn't have been there.
I don't winter in the RV that I want to upgrade. Charging during that time period would be only be to maintain the batteries, maybe LiFePo4 don't care about that when not under a load?
Maybe I should just go cheap for my first LiFePo4 bank, and find out the different ways that they can be not fit for purpose and/or ruined. Worked out with Lead Acid.
The AGMs are doing okay, but I need more AH on warmer days when the fridge cycles more. The bank area's footprint is what keeps me from adding another 100AH AGM, no room at the inn for the third AGM to lay its head down, and that would only gain 50AH. That is the reason for the sudden push towards LiFePo4.
Life Blue is temporarily sold out on all batteries.
The problem is that Lithium can't be charged when the battery is at freezing or below. You can discharge them at a lower temperature, just not charge them. There is a low temperature cut off for discharge but you need to refer to your battery. So if you are not going to be in the rig, charge them up and turn off the solar.
For those that are going to be in colder climates or just want to be prepared for the possibility the easiest way to deal with it is with batteries that have their own heat pads. I have also added heat pads controlled by a thermocube if it doesn't have its own thermostat.
Having the batteries inside when you are keeping yourself warm works too as long as you make sure that the warm air can get to the batteries. I do it with a small vent fan on a thermocube.
As Will said in one of his videos you can get away without the low temperature cut off in the BMS as long as you are using a controller like Victron with the temperature and voltage sensor that will stop charging if the batteries are too cold. I use it as a fail safe even with lithium batteries with a low temp BMS.
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