Range Extender - Any Updates? (MAR 2025)

[mongo]

The interesting thing is that if I recall correctly the Extender was supposed to be 50kWh or so, which makes me curious how that would work with the overall battery topology. Seems like if the main pack was two parallel strings of 61.5kWh, then it would be easy to parallel the Extender to them if it was also 61.5kWh.

As long as they keep the same chemistry and number of series groups per string, it's easy(ier) to link. Then capacity is then determined by the number of cells in each group.
Main pack is four 200V 58s7p modules
Extender could be four 200V 58s3p modules for 43% the capacity.

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[cybercricket]

As long as they keep the same chemistry and number of series groups per string, it's easy(ier) to link. Then capacity is then determined by the number of cells in each group.
Main pack is four 200V 58s7p modules
Extender could be four 200V 58s3p modules for 43% the capacity.

There could be some side effects due to the difference in internal resistance between the 7p groups and 3p groups.

 

[mongo]

There could be some side effects due to the difference in internal resistance between the 7p groups and 3p groups.

Nah, it all self equalizes. The main pack supplies more current and the extender less. On a per cell basis, everything looks the same.

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