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Yeah, I couldn't find good info on that. However my main concern is you'd be constantly discharging the battery while the car is running and it'd...
My guess is that you should be fine. I'm pretty sure there is some circuit between the DC-DC bar and the standby battery and therefore you can't...
Fair point. I made sure the inverter ground was not connected to the negative. I was worried about the DC-DC positive shorting to the chassis...
There is indeed no right answer on the resistor. You want it as big as possible to slow down the current, but not too big that the relay won't...
err, isn't it exactly what I'm doing? :)
Inverters have a big capacitor on the 12V side. Capacitors can take mostly infinite current (1000A or more, whatever your wire will allow). This...
Ok, since I can't edit the first message, and my solution is now hidden in the middle of the thread, I'll post it here again: Marc's Blog:...
I feel ignored :) First, 10 messages to tell me that the DC system cannot be bidirectional when it's the AC system that isn't, and then I wrote...
Please don't get things mixed up. I am not talking about AC charging, please re-read what I wrote. I am talking about DC charging which can now be...
Ok, fair enough, thanks.
Just to be super clear, are you sure the diodes are on the 400A DC bar? You need some big ass diodes for 400A, and doesn't the video say that...
I understand the car cannot generate and output AC, but the DC can be run backwards, can it not? If so, as I wrote earlier, you could get DC from...
you don't need a two way inverter, as long as you can get DC out of it from the charge port, that's enough to plug into some battery-less...
Are you sure? Tesla poised to unlock vehicle-to-grid abilities with 'bi-directional' charging systems says "There's logic to allow DC to flow out...
You can easily run a 120/240V extension cord out of the door with the door closed. My car is in my garage though, so I don't care either way :)
You summarized correctly, you can only get 200A from under the seat, the frunk battery is definitely behind a low amp charge controller and should...
do you know what fuse it's connected to? how many amps? by connecting to the DC-DC under the rear seats, you get 200A :) Marc's Blog: electronics...
Nice build, you don't screw around :) Given that I may very well never actually use my build (i.e. a real half or multi day power outage), I...
Correct, that's why my system is overbuilt, but the question was about overheating over time. Transient load over a few seconds won't cause...
The tesla DC-DC does not have a fuse that blows, it's a self resetable circuit. I'm not sure how many times it will self reset, but I'm assuming a...
To answer your questions: 1) I imrproved the wiring to reduce the voltage drop 2) yes, there is a loss of efficiency 3) no, I didn't calculate it...
You should be fine as long as you have a fast blow fuse and the car is a slow blow fuse (which is likely true).
It shuts down at the same time than the 200A DC-DC system, so you have to keep the car awake with sentry mode or camper mode or something like htat.
I'm not sure you can even pull 6A full time from the model 3 battery, I didn't measure carefully, but I believe the battery recharging system...
OMG, no you cannot. Please read the thread, this has already been answered.
That's what I've read, and I've gotten 120A from it in a test, so I'm willing to believe it'll do around 200A
which fuse are you referring to? The DC-DC converter is supposed to output 200A (not sure if that's continuous) and definitely does not have a 50A...
A few years later, I repeated Matt's "excellent idea" of tracking a stock non performance model 3 with aero wheels (really it's not, it's stupid,...
Oh, thanks Oh, thanks for that warning. To be honest, I wasn't seriously considering backfeeding my house due to how many sharp edges there are...
it is not directly connected to the battery in one direction (it can feed it via a trickle charger), but battery cannot feed back to the points I...
If you are connected to the DC-DC system, you aren't connected to the battery (which is good). When the car goes to sleep, the DC-DC feed under...
i ended up doing a writeup of the work I did in case it's useful to others: Marc's Blog: electronics - Using a Tesla Model 3 as Emergency Power...
I wrote a summary of my work here: Marc's Blog: electronics - Using a Tesla Model 3 as Emergency Power Source In Case of Grid Failure
So, I have an half unsolved question: what is the most battery efficient way to keep the DC-DC converter running? Camper mode with AC off, a low...
I started this route for my project and I can confirm that on model3, the car only the charges the battery at a low rate. If you are using more...
Two other related threads: Aftermarket Sub-woofer Amplifier Installation using DC-DC +12v Power Source MASTER THREAD: Powering house or other...
Thanks for posting me on yet another thread on the same topic. What I learned while doing my project is that the DC-DC system is a bit finicky in...
Sorry, what I wrote was indeed wrong in the details. They do allow you to store solar and use it at night, but it's stupid to do price-wise (i.e....
To close off that discussion on this thread too, please go to How many amps can you get from the 12V system for emergency situations? for how I...
Here's what I did: I used this 2000W pure sine wave inverter:...
Did you disconnect the 12V from both sides? If you only disconnect the battery, the DC-DC will keep the car alive from the other side. If the...
Interesting, I didn't think about those, but I am dealing with 200A, I'm not sure a few of those, even in parallel, are going to do the trick....
Thanks. It's a long document, what part was what actually helped? I'd think that if you disconnect 12V from both sides (battery and DC-DC side),...
How is your battery? Did you keep driving around for months with the "replace battery" prompt? If you didn't replace it, try this: 1) unplug it...
You are talking about a Model S, not a Model 3, correct? As stated earlier, I tried an 85W load with a cheap small inverter, and is was just...
Kind of, read on :) Ok, so I hear and understand everything you're saying but it seems that model3 is clearly limiting the charge going to the...
Hi Jamie, thanks for your post on the 12V DC-DC use. I'm not sure if you get a notification on replies, but if not, could I ask you to look at...
Out of curiosity, how does the car decide the battery needs replacing? Is it possible it see this from a low voltage once even though the battery...
I'm not going to fork this thread on powerwalls since I specifically said I was not interested in them, and knew why I was not, but in a nutshell,...
