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General Category => System Design and Layout => Topic started by: sirmoiu on July 09, 2019, 10:53:24 PM

Title: 6 12 volt batteries connected in series/parallel to make 48 volts.
Post by: sirmoiu on July 09, 2019, 10:53:24 PM
Hi,
    my battery bank is 48 volts, 4, 12 volts batteries connected in series, i  want to add 2 more to increase my amp/hr
    i would like to know if it is possible to connect the 6 batteries in series/parallel to make 48 volts. My system consists of 10, 150 watts  panels connected in series /parallel, 2- 2kw  inverters, 4, 200 amp/hr, 12 volts batteries. the other 2 batteries are 12 volts 200 amp/hr and the midnite solar controller 150.
Thanks.
Title: Re: 6 12 volt batteries connected in series/parallel to make 48 volts.
Post by: bee88man on July 10, 2019, 06:36:39 AM
If it took 4 batteries the first time to even get the 48 volts, then that's what it will take to do it over again...
Title: Re: 6 12 volt batteries connected in series/parallel to make 48 volts.
Post by: Doug on July 10, 2019, 09:54:28 AM
Hi,

If you have parallel strings of batteries each string must be the same voltage. So, 8 batteries minimum for series parallel.
Also, it is not good to mix old and new batteries.

Doug
Title: Re: 6 12 volt batteries connected in series/parallel to make 48 volts.
Post by: boB on July 10, 2019, 01:21:25 PM

Yeah, You won't want to add Amp-Hours to only 2 out of the 4 series 12V batteries.

They will become out of balance quickly and ruined.

Use 8 like Doug mentioned and you should be good.
Title: Re: 6 12 volt batteries connected in series/parallel to make 48 volts.
Post by: sirmoiu on July 10, 2019, 04:23:10 PM
ok thanks guys for the help.