How do I know if I need a battery isolator?

General Discussion about electric vehicles.
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jimbo69ny
100 mW
100 mW
Posts: 44
Joined: Feb 10, 2018 12:53 am

How do I know if I need a battery isolator?

Post by jimbo69ny » Feb 13, 2018 10:46 am

Hey guys!

I am working on a project to add a battery pack to my 2014 Rav4 EV to extend range. The OEM battery is made by Tesla and uses 2600 mah 18650 cells in a 92s48p configuration.

My plan is to add 3400 mah 18650 cells in a second battery pack. My pack will be 92s31p.

I thought I could simply run them in parallel but someone told me that I would have issues because the amp hour rating is different. He told me I should use an isolator. Is there truth to this? I was worried about the difference in amp hour ratings but I havent read anywhere that it would matter.

I've never used or researched isolators. Do I need one and do they make them that can handle 386 volts and 325 amps?

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