Combining multiple OEM batteries = How best?  [SOLVED]

Topics concerning OEM and open source BMSes
Post Reply
User avatar
acollins22
Posts: 33
Joined: Thu May 16, 2019 11:12 am
Location: Leicestershire, UK
Has thanked: 9 times
Been thanked: 6 times

Combining multiple OEM batteries = How best?

Post by acollins22 »

Hi,

I was watching Damien Maguire latest video https://www.youtube.com/watch?v=qjh6rvFDR-U in which he talks about using low[ish] capacity packs from an OEM.

He talks about combining multiple packs if you need greater capacity.

Is it as simple as just joining them in parallel? In my mind, if there is any difference in voltage between the packs, things will get fruity so how should it be done?


Thanks,

Andy.
User avatar
Bigpie
Posts: 1585
Joined: Wed Apr 10, 2019 8:11 pm
Location: South Yorkshire, UK
Has thanked: 74 times
Been thanked: 299 times

Re: Combining multiple OEM batteries = How best?

Post by Bigpie »

Make sure they're the same voltage before paralleling. I keep my parallel connection off with contactors when not driving or charging.
VW Beetle 2003
Outlander front generator
Prius Gen 3 inverter (EVBMW logic board)
Outlander charger
3x Golf GTE batteries
Chademo Charging
Outlander water heater
User avatar
acollins22
Posts: 33
Joined: Thu May 16, 2019 11:12 am
Location: Leicestershire, UK
Has thanked: 9 times
Been thanked: 6 times

Re: Combining multiple OEM batteries = How best?

Post by acollins22 »

Thanks Bigpie.

Does your system do any voltage checks before closing the contactors?

Cheers,

Andy.
User avatar
Bigpie
Posts: 1585
Joined: Wed Apr 10, 2019 8:11 pm
Location: South Yorkshire, UK
Has thanked: 74 times
Been thanked: 299 times

Re: Combining multiple OEM batteries = How best?  [SOLVED]

Post by Bigpie »

Nope. Probably should for extra caution. I just manually checked first couple of times
VW Beetle 2003
Outlander front generator
Prius Gen 3 inverter (EVBMW logic board)
Outlander charger
3x Golf GTE batteries
Chademo Charging
Outlander water heater
User avatar
acollins22
Posts: 33
Joined: Thu May 16, 2019 11:12 am
Location: Leicestershire, UK
Has thanked: 9 times
Been thanked: 6 times

Re: Combining multiple OEM batteries = How best?

Post by acollins22 »

Thanks. That's great.
Post Reply