| |
Subject |
Author |
Date Posted |
Forum
|
 |
RE: Lifepo4 cold temp cut off 23F or 32F?
Some battery makers are now building self heating LiFeO4 batteries.
No they don’t use their own amp hours to heat. The batteries can deliver energy down to -20C battery temp.
They use energy from the charging source to warm the cells. Then they begin to charge.
Lithium batteries can accept charge at very high rates.
This is why a small generator or engine alternator charging is probably step one in a lithium system then do the solar spend to round out the system, especially if you camp in winter, forest, shade, or rainy lands.
I wonder how long the heater would take to warm the battery bank at -37 c?
Best possible charge rate for best cycle life is 0.2 c. A 0.5c works well, too. Yes, you can charge faster--but with a trade off in cycle life.
Battleborn batteries have a heated version--and it DOES draw from the battery to keep warm unless there is external power available.
|
pianotuna
|
11/22/21 12:15pm |
Tech Issues
|
 |
RE: Contradictions with EV’s
time2roll,
Well said. My brother's system in the north is only doing 12 watts today. But 12 watts is better than no watts. This is his first winter with them in place.
|
pianotuna
|
11/22/21 12:09pm |
Tech Issues
|
|
RE: Solar Rv awning -- does it pencil out?
noteven,
Recommended charging rate for Li is 0.2 C Maximum may be listed as 0.5 C. Slower charging works well with LI--just stop at 90% state of charge. Li can be charged faster--but cycle life is impacted adversely. The big plus is not having to charge to 100%. Once a month it is good to take them to 100%, to reset the battery management system. Li has too many hoops to jump through for me. I've boondocked at -37 c (-34 f), which makes LI undesirable.
At 80% state of charge, lead acid self limits to 12.5 amps per 100 amp-hours. As a C rate that is 0.125, of course it goes down hill from there as it gets closer to 100%. But lead acid WANTS to be taken to 100% state of charge.
I prefer SiO2 to Li as they enjoy 100% but do not require it except once ever 30 cycles. Their recommended charging rate is 0.25 C
|
pianotuna
|
11/22/21 12:05pm |
Tech Issues
|
|
RE: Contradictions with EV’s
I love how folks think their EV is pollution free. Everyone in Co. Springs, CO is getting their electricity from a coal fire plant! Yes, that's clean! I love nuclear energy as well (zero emissions) but that creates it's on can of worms on disposal issues. Maybe we could load that nuclear fuel on one of Elon's rockets and send it crashing into the Sun for disposal!
Even with coal fired, the BEV is less polluting.
|
pianotuna
|
11/22/21 10:44am |
Tech Issues
|
|
RE: Lifepo4 cold temp cut off 23F or 32F?
It depends in the individual maker.
|
pianotuna
|
11/22/21 10:23am |
Tech Issues
|
|
RE: Solar Rv awning -- does it pencil out?
profdant139,
With modern batteries such as SiO2 that are not "destroyed" by partial charging nor deep discharges, a generator becomes even less needful.
I went 5 years with zero generator use. Then I made a mistake and got a generator. In hind sight, I would have been far better off to redo the solar.
|
pianotuna
|
11/22/21 10:16am |
Tech Issues
|
|
RE: Contradictions with EV’s
3 tons,
I worry not for myself, but for future generations, including my child.
|
pianotuna
|
11/22/21 09:57am |
Tech Issues
|
|
RE: Contradictions with EV’s
https://www.reuters.com/business/autos-transportation/when-do-electric-vehicles-become-cleaner-than-gasoline-cars-2021-06-29/
"DETROIT, June 29{2021} (Reuters) - You glide silently out of the Tesla (TSLA.O) showroom in your sleek new electric Model 3, satisfied you're looking great and doing your bit for the planet.
But keep going - you'll have to drive another 13,500 miles (21,725 km) before you're doing less harm to the environment than a gas-guzzling saloon."
https://graphics.reuters.com/ELECTRIC-VEHICLES/EMISSIONS/rlgpdrmjmpo/chart.png width=395
|
pianotuna
|
11/22/21 09:50am |
Tech Issues
|
|
RE: Generator to run three RV's?
Yes, a grid connection would be far more convenient and likely cheaper but...
30,000.00 buys a heck of a lot of solar.
|
pianotuna
|
11/22/21 08:36am |
Tech Issues
|
|
RE: Converting Honda generator to propane
The bigger challenge is obtaining and carrying enough propane if you will be using the generator for any length of time.
Is that really any worse than carrying enough gasoline to do the same thing?
If the RV is a diesel with propane cooking/heating, then carrying a gasoline generator is "one more stop" to make.
|
pianotuna
|
11/22/21 08:32am |
Tech Issues
|
|
RE: Contradictions with EV’s
Of course, you are wildly below typical usage (ie: no one is marketing based on your mileage). Average is around 12-15k miles per year.
That's good news. It means that in slightly more than 15 months a BEV reaches parity in co2 emissions--and from then on is less carbon intensive than an ice.
I do drive my RV (other than the last 2 years) far more than my car. I wish I could get a BEV RV, but sadly such an item is beyond my beer budget.
|
pianotuna
|
11/22/21 08:28am |
Tech Issues
|
|
RE: Contradictions with EV’s
My brother lives in the far north (Iqaluit). His price for electricity is 58.56 per kwh. He has wisely installed solar panels.
The United Kingdom has some days in the last year had 100% of their electrical demand produced by wind power. They sell the excess.
|
pianotuna
|
11/22/21 08:23am |
Tech Issues
|
|
RE: Converting Honda generator to propane
cons propane is more expensive than gasoline.
generator is some what thirsty for propane
output wattage is some what lowered.
pros
no worries about varnish build up in carburetor
oil changes less frequently
spark plugs last a lot longer.
I'd get a trifuel one--so that natural gas could be used.
Just have fun!
|
pianotuna
|
11/21/21 03:43pm |
Tech Issues
|
|
RE: MI to FL
https://www.google.com/maps/dir/Lake+City,+FL/Belleville,+MI+48111/@36.2225132,-85.9337662,6z/data=!4m15!4m14!1m5!1m1!1s0x88ef39657e70e3b3:0x50d84c97a6dc663a!2m2!1d-82.6392899!2d30.1896756!1m5!1m1!1s0x883b5095d7624ccf:0xb4a6f19a2c45da86!2m2!1d-83.4852133!2d42.2047619!3e0!5i2
|
pianotuna
|
11/21/21 03:36pm |
Roads and Routes
|
|
RE: bypassing the battery
time2roll,
The old Magnatec converts used the battery to stabilize the voltage. That's why they were so low in charge capability. Without the battery the voltage went pretty high. Not so bad in the old days--but with modern chip based controls--not so good for the devices.
|
pianotuna
|
11/21/21 03:32pm |
Travel Trailers
|
|
RE: Contradictions with EV’s
3 tons,
An apologist for the fossil and nuclear industry? Funded by the Nuclear Energy Institute.
It is always interesting to follow the money.
10000 sections of photovoltaic could power all of USA. In the past I knew some one who farmed 7 sections.
But-back to EV's.
https://youtu.be/pff085WDs_k
|
pianotuna
|
11/21/21 02:04pm |
Tech Issues
|
|
RE: Contradictions with EV’s
Getting back more or less "on topic"
Ford CEO Jim Farley outlined Thursday, with a series of tweets, that the automaker is now expecting to make 600,000 electric vehicles per year globally by the end of 2023. That’s double the previous plan, and enough to potentially be considered the number-two EV maker in the U.S. by then—if other automakers keep to their current plans, that is.
|
pianotuna
|
11/21/21 10:58am |
Tech Issues
|
|
RE: Contradictions with EV’s
3 tons,
How many years is the half life?
How many SNR's exist in North America? (none at the moment)
How many SNR's are there in the world (2 in Russia but with only one completed with a cost over run of 100%)
How small is an SNR (about 2 football fields).
Where is the permanent storage facility in the world? (none at the moment)
What was the cost on the last 2 nuclear reactors in North America (2016) 27 billion dollars.
How much solar could be installed for 27 billion--with RETAIL pricing being as low as $0.26 cents per watt?
And you like the nuclear option? Go buy a Prevost!
|
pianotuna
|
11/21/21 10:43am |
Tech Issues
|
|
RE: bypassing the battery
Turn off the breaker for the converter
Disconnect the positive cable. Wrap it with red electricians tape.
The electronic devices don't seem to work too well. I think the rodent's get used to the noise. They also draw very little power--so they are not very loud.
Put some poison in a tall (24 inch) pail. The rodents will be attracted to it and then are unable to climb out. This works with food items as well. DAMHIK
|
pianotuna
|
11/21/21 10:24am |
Travel Trailers
|
|
RE: MI to FL
I guess it depends where you are starting from.
27 is a picnic compared to Atlanta. I went through on my first trip south. HOURS of sitting almost still--and on a Sunday morning. I wanted to see the relief carvings, which were lovely.
Starting from Minneapolis, I go through St. Louis, MO then Montgomery, Alabama. Destination is Orlando.
|
pianotuna
|
11/21/21 09:57am |
Roads and Routes
|
