How to connect your batteries to make up a 24V or 48V system

25 CommentsThursday, 4 August 2016  |  Admin

How to connect your batteries to make up a 24V or 48V system

For larger systems with more than a couple of panels there are some advantages in running at a higher voltage:

  • DC cable losses are reduced
  • At higher voltage many charge controllers can run more panels

Most batteries are rated at 2V, 6V or 12V so you will need to connect them in series in order to reach the voltage you require.

Connecting batteries in series means connecting the (+) terminal of the first battery to the (-) terminal of the next battery. Each battery you connect in series increases the voltage of the battery bank.

Here are a few examples:

Two 12V batteries connected in series, the total voltage is 24V

Four 12V batteries connected in series, the total voltage is 48V

Four 6V batteries connected in series, the total voltage is 24V

What voltage should I run my system?

The voltage of your panel must be higher than the voltage of your battery bank. This is because most charge controllers are only able to step down the voltage from the panels to match the battery, and they can’t step it up.

  • Small panels (100W, 150W) are usually rated at 12V or 18V so in this case you would require a 12V battery bank.
  • Larger panels are often rated 24V or 30V (such as the 250W Ulica) and in this case you will do better with a 24V battery bank.
  • If you are installing several panels you can connect them in a string in order to achieve a higher voltage. Larger systems are best designed to run at 24V or 48V.

Advanced setup: connecting batteries in series and parallel

Suppose you have four 12V batteries but you want to put together a 24V battery bank. You could connect a pair of batteries in series, and then another pair of batteries in parallel.


Seyha
Sunday, 25 December 2016  |  13:25

Am have battery 12v two 6v two and 24v want to battery 48v


Percy
Thursday, 9 November 2017  |  1:36

easiest 2 diagram iv seen to describe it but still im stuck when i need to add more batteries.
i have 21 x 12v 55Ah deep cycle batteries.
how would i configure them for a 24v using 6500AH or 48v system at 1625AH.
if u could solve these problems i have i will paypal you 20.
:)


Admin
Thursday, 9 November 2017  |  10:46

Hi Percy,

Please can you email me your email address to info@newenergyco-op.co.uk and I hopefully be able to answer your question!

Best regards

Cliff


Shana
Tuesday, 14 November 2017  |  15:23

I have four 12v soler sels how much valtege battary i need


John
Tuesday, 20 February 2018  |  12:39

what will be th kva? and A/h of a 48v system if u built it with 24 2v 770a/h batteries


Admin
Tuesday, 20 February 2018  |  13:25

You would get a battery at 48Volts with 770AH but you would normally only run these at 50% depth of discharge if being discharged on a regular basis and if lead acid so this would be 335AH
You can discharge to a lower depth and the 2 volt cells are more resilient than 12 batteries. but this would shorted the life of the battery if done on a regular basis

The KVA figure would really depend on the inverter that you have driving the AC system as these are limited to the transformer size, however the 335AH is available whether you draw this in 5 minutes or 5 hours depending on the load.


Uli
Sunday, 8 April 2018  |  9:46

Hi there.
I need an advice i have 6 12v 130AH batteries which is the best way to connect them to my 24v 2500w inverter? And what size of cable and fuse do i need.

Thanks
Uli


Admin
Monday, 9 April 2018  |  11:05

Hi Uli,

You would need to connect 2 in series and 2 in parallel you will get a total storage of 260AH.
The Fuse would need to be 120A or possibly 130A depending on the load and the tolerance of the inverter.

Best regards


Uli
Monday, 9 April 2018  |  16:55

Hi there thanks with your advice the connections 2 in series and 2 in paralel make them 4 battery i have 6 in total so i just add them paralel and in series with the others?? And i have a 16mm rigid cable do you think is ok or its too small to connect the batteries and the inverter? And what size of fuse do i need to use between my 40A MPPT and the batteies?
Thanks again
Uli


Kapil Joshi
Thursday, 12 April 2018  |  6:06

How can I make connection of 24v from 9 v batteries


Luke A.
Saturday, 7 July 2018  |  17:46

Hi,

want to run my setup in 24Volts. I have 2 x 120Ah and 2 x 220 Ah Batteries.
How do I have to wire them ? 120Ah+220Ah in series and then both parallel ?

Luke


Praveen Kumar
Thursday, 27 September 2018  |  14:33

I have 60nos batteries each 12V 150Ah ,how to connect batteries for 48V with minimum power loss.


Peter Williams
Saturday, 29 September 2018  |  15:21

I have a disability scooter which is powered by 4 x12v x20ah batteries. How do set them up to make 48volts.


Admin
Tuesday, 2 October 2018  |  11:29

Hi Peter,

You will need to wire these up in Series to make up the voltage to 48v as per the diagram above.

MARKED
Four 12V batteries connected in series, the total voltage is 48V

Best Regards


Wayne Watson
Friday, 26 October 2018  |  16:22

Also have E-V wheels36 scooter, powered by 4ea. L.A. batteries =48volt output. 500watt. Can 4ea. of these batteries work to deliver the 21m.p.h speed with 50miles range. The L.A. batteries work to deliver the speed, but not the range, it being 11miles use needing total recharge. Your opinion??


Onesmus
Wednesday, 3 October 2018  |  18:27

what determines the size of charge controller??


Wayne Watson
Friday, 26 October 2018  |  16:37

Do not have much data on electric system or charger. The data I do have, if correct is 48volt charger.


Admin
Monday, 29 October 2018  |  11:31

Good morning and thank you for your post, if you can email us direct at info@newenergyco-op.co.uk we will be able to help you further. Best regards GG4U


Francisco Lopez
Sunday, 28 October 2018  |  13:06

I'm fitting a off grid solar system to my static caravan I have 4x 6v 235ah battery with a 24v mppt 2000w inverter what would be the best wattage panels for this system and would I have to 24v panels and what fuse is best to use thanks


Admin
Monday, 29 October 2018  |  11:31

Good morning and thank you for your post, if you can email us direct at info@newenergyco-op.co.uk we will be able to help you further. Best regards GG4U


Sulaimon
Wednesday, 7 November 2018  |  11:10

any help plsss i need to get a 48 volts from eight 12volts cells and d connection should be both in parralel and in series


Okwalinga Ivan
Sunday, 11 November 2018  |  13:55

you are provided with 16 solar pannels to be connected on a 48 solar inverter. if the solar panels are rated 12v and 75w .Calculate the power input.
Estimate the rate voltage output for the load if that system is connected to 36 batteries of 20ah.Draw the circuit diagram that shows the wiring arrangement on the solar grid


George Casados
Sunday, 25 November 2018  |  2:33

I'm beginner using solar systems and I have a 6000 what inverter and 24 - 48 controller. I'm wondering if someone can help me with that how to connect 8 batteries 6 volt each with 235 Ah. I need a diagram of 24 volts battery Bank and how to calculate the fuse I need between the inverter and the Bank. Please can you help me out?. Thanks in advance


Naveen
Thursday, 29 November 2018  |  18:12

if total four bateries are there, single battery capacity is 12 v 150ah, connect in series,what is output?

and if same all connect in parallel,what is output?

and if combination of 2 in series, connected in parrel with other 2 in series, what is output?

please reply fast. thanks


Naveen
Thursday, 29 November 2018  |  18:16

sorry i have forgot to mention,

output load is 400W. same for all combination

 
 
 
 
 
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