โNov-03-2021 03:56 PM
โNov-10-2021 08:40 PM
BFL13 wrote:
I saw this while Googling about the 12v battery--some confusion and also Tesla might be changing to AGM in newer model cars--anyway if this is correct, the 12v battery is a 45AH sealed FLA that is charged by the car somehow using an algorithm set in firmware at 14.4, but outputs to the 12v things at 13.4. The 12 battery gets recharged when it reaches some lower SOC at some set-point I think ???? Not a clue.
Looks like you want to get at that 14.4 the 12v battery gets and not the 13.4 from the camping outlets and 7-pin?
Easy to measure the voltage in the cig lighter with your digital meter.
"The Hanhook 12V batteries in the Model Y/3 may not be AGM but it appears Tesla is charging them as if they were. I monitor the 12V post voltage with a Bluetooth voltage monitor. Anytime the car is awake the voltage is either 14.4V (actively charging via DC-to-DC converter) or 13.4V (DC-to-DC supplying power to 12V operational loads). Dropping to 13.4V did not happen until a fairly recent firmware update, prior to that it was always 14.4V when not sleeping. I purchased a NOCO Genius G7200 to maintain charge level, with the negative cable not connected, so the battery is not connected to the car while using the charger. The charge mode I use (or should I say the charger automatically selects) is 12V Cold/AGM. According to the NOCO manual the charge voltage in this mode is 14.8V (which is what my BT device measures). Neither Tesla nor the Smart Charger charge at 16V. If I am using the wrong charging mode, what mode should I be using? Note the BT monitor might be off by +/- 0.1V
From Hankook web page:
Charge for 24 hours as following voltage upon battery type.
- 12V MF Battery: 16V
- 12V AGM Battery: 14.4V
See this Hankook webpage for more info.
Battery Maintenance - Hankook AtlasBX Technical Information"
โNov-10-2021 08:20 PM
โNov-10-2021 03:35 PM
BFL13 wrote:
Having an EV for a TV is a whole new thing! Very interesting.
โNov-10-2021 03:26 PM
โNov-10-2021 03:15 PM
BFL13 wrote:
Interesting about the Tesla, thanks. What about voltage to the 7-pin and the camping 12v sockets? You can run things at 12v, but actual battery charging requires more like 14v or so.
With a gasser, you use the DC-DC to boost the engine battery voltage from 13.8ish to 14.6ish. Charging at 13.8 is lame. The Tesla might only be giving you 12.6ish or whatever to run your camping things and the 7-pin for trailer signal lights?
Sounds like the portable gen is going to get a lot of work!
โNov-10-2021 01:52 PM
โNov-10-2021 12:47 PM
pianotuna wrote:Reisender wrote:
You are from BC so you know we are kinda blessed with charge infrastructure here and itโs growing super fast as well.
three years ago there were 37 charge points in Regina. Over 1/2 were free to use.
โNov-10-2021 12:42 PM
BFL13 wrote:
No clue about EVs. Can you use a DC-DC charger instead of the 7-pin like you can with a gasser? The limit with those is the alternator amps vs the DC-DC input so not to over-task the alternator. What happens with an EV?
โNov-10-2021 09:28 AM
โNov-10-2021 07:20 AM
โNov-10-2021 07:06 AM
pianotuna wrote:
BFL13,
Given that SiO2 can do 4C continuously, and can be taken to 0% state of charge, why would you suggest that it takes 2 SiO2 to equal 1 LiFePo4?
โNov-10-2021 06:51 AM
Reisender wrote:
You are from BC so you know we are kinda blessed with charge infrastructure here and itโs growing super fast as well.
โNov-10-2021 06:10 AM
BFL13 wrote:
More idle thoughts:
You could stash the LFP and its inverter in the tow vehicle. Run the extension cord from it to the trailer shore power cord.
Note the 45 minutes won't put many AH back in even doing 50-80s.
Say you have a 60 amp charger and you are down 100AH /50%. 45 minutes will get you 45AH (minus a few for heat) so you are now at 145AH and you used 100 the first day, so by next day you are down another 100 to 45AH remaining.
Conserving to 50AH a day means you are down to 150/ 75% and where Bulk ends so your 60 amps will taper from the start doing the 75-90 so it will take longer. ( You don't do past 90 on generator on low amps and waste a lot of gen fuel for little return.) So you only are back to 180AH- restored 30AH of that 50. Next day you are down another 50 to 130AH and so on.
You could splurge the first day to get down to 50% and then do 50-90s. but in any case you will be running the gen for a couple hours a day or even longer depending, so you will need lots of propane or gasoline for it. Doesn't help if they are LFP--an AH is an AH no matter where it came from.
Having an EV for a TV you can plug into is very interesting--IMO that is the way to go if available. Nobody cares about efficiency while camping. You just want to get to tomorrow without freezing in the dark.
โNov-10-2021 05:27 AM