Help! Deeply discharged Tesla Battery

[scifisanta]

Hello all,

I'm new to the forum but I have followed Will for a bit and gave the DIY Tesla solar set up a shot in my van. I had everything all set up and working smoothly until I lost a solar panel in some bad weather. The broken circuit resulted in the battery being drained over the next couple of days while I was away from the van at work and now I have the predicament of not being able to charge the Tesla battery externally.

I have the battery running through a 220 Amp Victron Battery Protect and charge the battery with 320 Watts of 24v solar via a Victron 20 Amp MPPT charge controller.

I have looked for 24-volt lithium-ion battery chargers here in the PNW and haven't found any or even online. Any help or advice that can be offered would be greatly appreciated.

 

[gnubie]

Is the the battery not accepting power from the Victron SCC or is Victron not outputting any volts on its terminals?

 

[Newenough]

Progressive Dynamics make an excellent lifepo4 charger that may work for you. It charges from a 120v source (outlet or generator). The have 25 and 40amp output models.

Link

I rarely need a secondary source for charging, and dont need to hit the top end SOC for lofepo4. I just need to get to the next sunny day, so I went with standard lead acid model as it is a cc/cv 27.2 at 25amp and can also use it for the few legacy batteries I still have. But for your setup, would recommend the lifepo4 unit I linked to. But verify your required charge profile to the output of this unit first.

 

[Geriakt]

I highly recommend you purchase a charger that allows for a custom charge profile since over charging a Tesla module can result in a thermal run away. Do not use a charger for LiFe as the charge profile is too high.

Either use a power supply that you can adjust the charge between 24 to 25 volts. You should not go higher than 25.2 volts.
Another option you may like is purchase a Victron Orion TR smart 12/24 DC to DC charger and install in your van for a secondary charge source.

By the way how did you under charge your tesla since you have a BP220 in line? It should have switched off at 19 volts to save your battery?

 

[Geriakt]

By the way. I employ a Tesla battery system. I charge by solar and a Victron Multiplus 24/3000.

 

[SolarRat]

Does the battery have any voltage on it's external leads? If not, you'll probably have to open it up and charge up the cells a bit manually.