Powering accessories and amps off new 12v li battery

[nvesprini]

Has anyone run into issues powering accessories, tire inflators or audio amplifiers with the new 12 volt lithium battery? I've read that it's actually 15.5 volts so that's much higher than what a lead acid peak voltage would be and might be out of range for what most amps and accessories were designed for. Plus the voltage would likely go higher when the car charges up the 12v battery which I assume would be often since it's a low capacity. Don't want to buy an amp or inverter for the car only to find out itll get fried.

Tha is in advance.

 

[ATPMSD]

Not sure where you got that 15.5 voltage number from, normal charging voltage is 14 volts. Check out this chart from Ohmmu’s website

Better Performance | ohmmu

Ohmmu Lithium batteries out-perform all of the competition, upgrading to Lithium from Lead Acid is a no-brainer

www.ohmmu.com

 

[cgell]

Not sure where you got that 15.5 voltage number from, normal charging voltage is 14 volts. Check out this chart from Ohmmu’s website

Better Performance | ohmmu

Ohmmu Lithium batteries out-perform all of the competition, upgrading to Lithium from Lead Acid is a no-brainer

www.ohmmu.com

View attachment 768469

They are not asking about the ohmmu. They are talking about the new OEM lithium that Tesla has started to use (made by CATL). 6.9 Ah and 15.5 V nominal

 

[nvesprini]

Not sure where you got that 15.5 voltage number from, normal charging voltage is 14 volts. Check out this chart from Ohmmu’s website

Better Performance | ohmmu

Ohmmu Lithium batteries out-perform all of the competition, upgrading to Lithium from Lead Acid is a no-brainer

www.ohmmu.com

View attachment 768469

What you're showing is the charging of an aftermarket lithium 12v used to replace the stock lead acid 12v. The newer cars shipping with a stock 12v lithium battery are actually 15.5. this is why along with other updates the washer fluid pump needed to be updated to accept the higher voltage. Loads of posts on this site and elsewhere discussing the new battery and the 15.5v but couldn't find anything regarding aftermarket accessories.

 

[jcanoe]

Conventional automobile alternators operate at between 13 and 14.5 volts DC +/- a TBD amount. The unloaded voltage of the new lithium 12V battery may be 15.5V but under load the voltage will be lower. Any automobile 12V aftermarket accessory such as a tire inflator should be able to operate at up to ~15V without any issue. The Tesla washer fluid pump may a one off case where the pump motor is not able to operate at the slightly higher voltage. If every other 12V motor, actuator and electrical component in the Tesla vehicle was incompatible with the slightly higher voltage then Tesla would not have changed from the older lead-acid 12V battery.

 

[howardnj]

Conventional automobile alternators operate at between 13 and 14.5 volts DC +/- a TBD amount. The unloaded voltage of the new lithium 12V battery may be 15.5V but under load the voltage will be lower. Any automobile 12V aftermarket accessory such as a tire inflator should be able to operate at up to ~15V without any issue. The Tesla washer fluid pump may a one off case where the pump motor is not able to operate at the slightly higher voltage. If every other 12V motor, actuator and electrical component in the Tesla vehicle was incompatible with the slightly higher voltage then Tesla would not have changed from the older lead-acid 12V battery.

You can get one of these on Amazon to monitor voltage

 

[John in LB]

The Li-ion battery that is installed by Tesla is rated 12V, 6.9Ah

The attached photo is the battery nameplate taken off of a YKR with a build date of January 9, 2022.

The voltage should not be a problem for accessories, But Amperage draw could be.

 

[doubleshot]

The Li-ion battery that is installed by Tesla is rated 12V, 6.9Ah

The attached photo is the battery nameplate taken off of a YKR with a build date of January 9, 2022.

The voltage should not be a problem for accessories, But Amperage draw could be.

It's not. 12V system is what that's referring to. That system is never really 12V. On a Tesla w the new batteries, it's 15.4-6V

There's lots of things having a problem being over 15V. Load doesn't change the voltage much since it's a lithium battery. That being said. 12V in an ICE goes from 11V to 14.5ish depending on the alternator generation and load. 15V+ is unplanned for in automotive electronics. Chips need to have a tolerance of 16V minimum. Some of these accessories don't have that tolerance.

 

[Mrbrock]

There should be a label on the device stating the input voltage range it can accept. Make sure 15.5V is included in that range.

 

[ATPMSD]

From the 2021 MS manual

“Note A power inverter plugged into the low voltage power socket must support 16V DC input to function”

So it looks like you better be careful what you plug in! This is kind of dumb to me since this has always been a 12V port but hey, Elon clearly does not come down from mount Elon to the real world.

 

[Nordo]

Apologies for the dumb question, but does anyone know if theres a portable air compressor that works with the new li ion battery? I cant tell based on the description on Amazon if it supports 16V.

 

[Rocky_H]

From the 2021 MS manual

“Note A power inverter plugged into the low voltage power socket must support 16V DC input to function”

So it looks like you better be careful what you plug in! This is kind of dumb to me since this has always been a 12V port but hey, Elon clearly does not come down from mount Elon to the real world.

Remember a few years ago when Tesla was talking about how they wanted to move the systems in their cars toward a 24V system because it was more efficient, but they had decided they couldn't because common automotive equipment they needed to buy from suppliers and use just was not available that could use 24V? It sounds like they are slowly moving toward 24V anyway, little by little, like slowly boiling the frog.

 

[jcanoe]

Apologies for the dumb question, but does anyone know if theres a portable air compressor that works with the new li ion battery? I cant tell based on the description on Amazon if it supports 16V.

You would have to contact the manufacturer to confirm the operating voltage range of the compressor. The issue with accessories supporting 16V seems to be with 12V to 120V power inverters as these have a tightly regulated power supply.

 

[JohnB007]

So has anyone actually tried to convert this into 110v and charge laptops?

Or perhaps charging Jackery-type of batteries?

 

[e645824]

Another potential problem is the voltage port on the trailer connection. In a different thread, the washer pump AND the trailer connection 12V port were identified as problems which prevented Tesla from offering an upgrade kit for pre-2022 Model Y owners.

Scott

--

MYLR | Red ext | White int | 19" | 5 seats | tow | no FSD | made/delivered Oct 2021

 

[Unclepaul]

Not unusual for a 12V battery to put out 13 or more volts on a full charge.

Most 12v plug in devices can easily handle 16v source.

 

[Mrbrock]

Another potential problem is the voltage port on the trailer connection. In a different thread, the washer pump AND the trailer connection 12V port were identified as problems which prevented Tesla from offering an upgrade kit for pre-2022 Model Y owners.

Scott

--

MYLR | Red ext | White int | 19" | 5 seats | tow | no FSD | made/delivered Oct 2021

It is not necessarily the port. You can power normal trailer brakes and lights with the current connection. What you can't do is pass on auxiliary power to the trailer. Lights will be fine with 15V but the aux should not send over 14V or you might blow something in the trailer. This module was not included and is supposed to be retrofit at a later time.

 

[MindBlend]

Yep, I just got an adapter to power a laptop that's rated to support 12v Or 24v input. It does not work in my new Tesla

 

[e645824]

Yep, I just got an adapter to power a laptop that's rated to support 12v Or 24v input. It does not work in my new Tesla

You may find this thread helpful:

https://teslamotorsclub.com/tmc/threads/power-inverters-for-newer-16v-outlet-cars.265365/​

The OP there tried several inverters with the new lithium 16V battery. Good general discussion on the topic also.

Scott

--

MYLR | Red ext | White int | 19" | 5 seats | tow | no FSD | made/delivered Oct 2021

 

[MindBlend]

You may find this thread helpful:

https://teslamotorsclub.com/tmc/threads/power-inverters-for-newer-16v-outlet-cars.265365/​

The OP there tried several inverters with the new lithium 16V battery. Good general discussion on the topic also.

Scott

--

MYLR | Red ext | White int | 19" | 5 seats | tow | no FSD | made/delivered Oct 2021

Tried suggestion 1 and 3 neither worked on Model Y showing 15.5v on the adapter.