nissan leaf cell information and query.

[glyndwr]

Hi all,
I have built a 14s battery pack pack using 7 nissan leaf batteries (2s2p), to get the full use out of the battery i need to charge the pack to 57.4v which equates to 4.1v per cell, still well within the full charge capacity for this type of battery.

BUT....... my Solis inverter for some unknown reason will not charge above 56.4v, although the data sheet states the max charge to be 58v.

Im not sure if the inverter has an issue or not.

Ive thought of reducing the string to 13 in series, but that would mean on cell1, the neg battery terminal instead of being fitted to the battery end 6mm terminal post it would move to the middle 4mm terminal post, taking out completely the end cell from the string.
Can this be done without causing an issue with high current draw of around 100 amps.

Has anyone had any experience in just using one half of the nissan pair of cells.

Thank you,
Anthony.

 

[floydr]

My guess is that the charger is set to charge to 56.4V.
ie voltage of 4 12V lead acid batteries. 14.1V x 4
The battery will last longer only charging to 56.4V provided it is set to one of the 3.7V lithium chemistries charge profiles.
later floyd

 

[glyndwr]

hi Floydr, the Solis hybrid inverter charger menu has option to set and to charge to 58v, but it never gets there, also its my understanding that to properly absorb a lead acid battery the absorbtion voltage on a 48v pack is 57.4v, and absorbtion is very necessary for a lead acid battery.
The inverter has a lead acid option setting, and in that setting you can select what voltage you want to charge and discharge to, i think either the inverter cannot get to 58v due to hardware limitations or it has a software / firmware issue not allowing charge above 56.4v.
Thanks