Sprinter-Forum    
 

Go Back   Sprinter-Forum > Sprinter-Based RV's & Conversions > Sprinter RV's & Conversions Talk

Sprinter RV's & Conversions Talk Common features found in Sprinter RV's and Conversions.


 
Thread Tools Display Modes
Old 07-13-2019, 08:37 PM   #1
gordstray
 
Join Date: Aug 2018
Location: NC
Posts: 59
Thanks: 27
Thanked 5 Times in 5 Posts
Default Tesla Model S Module Inverter/Charger

I'm interested in a Tesla Model S module (5.2kwh) for the house battery. @ 25.3 volts it is fully charged...@ 19.3v the battery still has about 20% left but most 24v inverters will cut off leaving that capacity unusable. I would also like to use any and all available power sources to charge...solar, shore, Honda 2000 gen set, possibly eventually a 2nd alternator, (I already have a small 500 watt inverter under the seat off the OEM aux battery) that could provide AC to the battery compartment. Anyone know of a good quality inverter/charger that can handle the full capacity of this battery and accept multiple charging sources?

Couple notes...could get by with 2000 watt inverter, probably prefer 3000. There's this one https://solargeni.com/online-store?olsPage=products%2F6000-watt-tesla-lithium-inverter-charger-252v-6s, but it seems overkill like it is for a power wall or such. A fully programmable unit where you can specify the top and bottom ends is what I am looking for.

Thanks in advance.

Last edited by gordstray; 07-13-2019 at 08:40 PM.
gordstray is online now   Reply With Quote
Old 07-13-2019, 08:46 PM   #2
Midwestdrifter
 
Join Date: Sep 2013
Location: Charlotte NC
Posts: 9,432
Thanks: 1,867
Thanked 6,271 Times in 3,947 Posts
Default Re: Tesla Model S Module Inverter/Charger

For this type of setup you really need a fully programmable inverter. The cheaper units are going to provide the control you need for something as sensitive and expensive as a telsa pack.
__________________
2004 T1N | Overland Conversion in Process Completed...For now... | 101,000 118,XXX 137,078 165,000 miles | 140" | High Roof | My Build Thread
Another Random Blog | http://VagariesAbound.blogspot.com
Midwestdrifter is online now   Reply With Quote
The Following User Says Thank You to Midwestdrifter For This Useful Post:
DesertAdventures (08-09-2019)
Old 07-13-2019, 08:51 PM   #3
gordstray
 
Join Date: Aug 2018
Location: NC
Posts: 59
Thanks: 27
Thanked 5 Times in 5 Posts
Default Re: Tesla Model S Module Inverter/Charger

So stay away from inverter/chargers and go with separate components? Any suggestions?
gordstray is online now   Reply With Quote
Old 07-13-2019, 08:51 PM   #4
john61ct
 
Join Date: Apr 2018
Posts: 1,327
Thanks: 25
Thanked 320 Times in 276 Posts
Default Re: Tesla Model S Module Inverter/Charger

And a standalone charger with just the right programmability.

Adjustable lab style PSU, ideally fed DCDC for the input flexibility, you would need to figure the charge endpoint.

Be aware risky chemistry away from its BMS and especially thermal management systems, many millions invested no longer protecting you.
john61ct is offline   Reply With Quote
The Following User Says Thank You to john61ct For This Useful Post:
gordstray (07-13-2019)
Old 07-13-2019, 08:57 PM   #5
gordstray
 
Join Date: Aug 2018
Location: NC
Posts: 59
Thanks: 27
Thanked 5 Times in 5 Posts
Default Re: Tesla Model S Module Inverter/Charger

Pretty confident I would not be discharging under load anywhere near the power needs of a Tesla, but you are correct in that these units should not be over charged or discharged nor get too hot or cold.
gordstray is online now   Reply With Quote
Old 07-13-2019, 08:58 PM   #6
Midwestdrifter
 
Join Date: Sep 2013
Location: Charlotte NC
Posts: 9,432
Thanks: 1,867
Thanked 6,271 Times in 3,947 Posts
Default Re: Tesla Model S Module Inverter/Charger

Have you looked at victrons inverter/chargers? They generally are fully programmable.
__________________
2004 T1N | Overland Conversion in Process Completed...For now... | 101,000 118,XXX 137,078 165,000 miles | 140" | High Roof | My Build Thread
Another Random Blog | http://VagariesAbound.blogspot.com
Midwestdrifter is online now   Reply With Quote
The Following 2 Users Say Thank You to Midwestdrifter For This Useful Post:
DesertAdventures (08-09-2019), gordstray (07-14-2019)
Old 07-13-2019, 08:59 PM   #7
OrioN
2008 2500 170" EXT
 
OrioN's Avatar
 
Join Date: Sep 2007
Location: Vancouver, BC
Posts: 9,765
Thanks: 549
Thanked 2,400 Times in 1,761 Posts
Default Re: Tesla Model S Module Inverter/Charger

Quote:
Originally Posted by gordstray View Post
Pretty confident I would not be discharging under load anywhere near the power needs of a Tesla, but you are correct in that these units should not be over charged or discharged nor get too hot or cold.
The unit you posted and linked to in your first post looks like an ideal solution and spec's and nice price too.
OrioN is online now   Reply With Quote
The Following User Says Thank You to OrioN For This Useful Post:
gordstray (07-13-2019)
Old 07-14-2019, 04:39 PM   #8
HarryN
 
Join Date: May 2010
Location: Pleasanton, CA
Posts: 2,328
Thanks: 526
Thanked 742 Times in 606 Posts
Default Re: Tesla Model S Module Inverter/Charger

My older son built a fully battery powered concession trailer using most of a model S pack a few years ago.

Most people focus on the capacity aspect, but less appreciated is that the Tesla pack very actively liquid cooled - as in the coolant flows through the modules to carry heat away from the cells.

The packing density is very high (a good thing) but without the coolant flow, heat transfer is very poor compared to a battery designed for air based cooling. We used C/20 as our design basis, but probably could have used C/10. I definitely would not use C/2 charge / discharge rates as a design basis without a vented fire proof steel container.
__________________
Auxiliary Power for conversion vans

Instagram WirlNet
HarryN is offline   Reply With Quote
The Following 2 Users Say Thank You to HarryN For This Useful Post:
DesertAdventures (08-09-2019), gordstray (07-14-2019)
Old 07-14-2019, 04:57 PM   #9
gordstray
 
Join Date: Aug 2018
Location: NC
Posts: 59
Thanks: 27
Thanked 5 Times in 5 Posts
Default Re: Tesla Model S Module Inverter/Charger

There's a guy on Youtube who actually uses coolant and aquarium heaters/pumps to keep his from getting too hot or cold. He has multiple modules. The design reminder is a good thought. I definitely would not design without a temperature probe cutoff for too hot/too cold. Anyone know of cabinets like Harry proposes?
gordstray is online now   Reply With Quote
Old 07-14-2019, 05:45 PM   #10
HarryN
 
Join Date: May 2010
Location: Pleasanton, CA
Posts: 2,328
Thanks: 526
Thanked 742 Times in 606 Posts
Default Re: Tesla Model S Module Inverter/Charger

Just as a point of interest, a C/10 rate for a 3 kW inverter is (3 kW) x (10 hrs) = 30 kW-hrs, so around 6 each of those 5 kW-hr modules.

Tesla makes very nice battery packs, but achieving fully automated charging control is not that easy. My son's implementation still required periodic module level balancing and charging. There are more products on the market to do this now then when he did it.

The complete lack of factory support makes re-sale very challenging, in spite of the performance potential.
__________________
Auxiliary Power for conversion vans

Instagram WirlNet

Last edited by HarryN; 07-14-2019 at 05:50 PM.
HarryN is offline   Reply With Quote
The Following 2 Users Say Thank You to HarryN For This Useful Post:
bconley (07-15-2019), DesertAdventures (08-09-2019)

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump



All times are GMT. The time now is 01:46 AM.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2019, vBulletin Solutions, Inc.