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General Category => General Discussions => Topic started by: SherylinRM on September 30, 2020, 07:43:59 AM

Title: Didn't know where to put this so. Can you do 12 & 24 volt load on a battery bank
Post by: SherylinRM on September 30, 2020, 07:43:59 AM

OK so if I wire my 8 cells [4 per 12 volts] like the picture.
Can I run both a 24 volt load AND a 12 volt load off of it?
Possible? Impossible?
Thanks guys  :)

See attachment for the picture.

Title: Re: Didn't know where to put this so. Can you do 12 & 24 volt load on a battery bank
Post by: Bikemad on September 30, 2020, 02:10:03 PM

Definitely not as you've shown it, you cannot take a 12V and 24V supply from all of the cells, as your additional wiring is effectively short circuiting both groups of 4 cells.  :o

(https://goldenmotor.com/SMF/index.php?action=dlattach;topic=7058.0;attach=8776;image)

Taking a 12V supply from just half the pack would be possible, although not recommended, as it would discharge the pack very unevenly. This would also put a high load on your BMS and greatly increase your charging time as the BMS struggled to balance the unevenly discharged cells. :(

The best way to provide a 12V output from a 24V battery would be to use a 24V to 12V DC/DC converter (https://www.ebay.com/itm/Waterproof-DC-DC-Converter-Regulator-24V-12V-20A-MPN-ME-24S1220/122646121532) to drop the voltage down to 12V, but you will need to ensure that the maximum current rating of the DC/DC converter is sufficient for all of your 12V requirements.

Alan
 

Title: Re: Didn't know where to put this so. Can you do 12 & 24 volt load on a battery bank
Post by: SherylinRM on October 01, 2020, 12:01:09 AM

I thought so. It looked to good to be true LOL.
Thanks a lot yet again Alan  :)