How to Choose Between a 12V and 24V Solar Panel?

It is awesome that you have decided to go solar. Your decision will not only result in savings for you but is also a good option for the environment. But there are many different parameters to screen before deciding upon your final solar panel and being a common man, it becomes difficult to decide. It becomes difficult to choose between the tons of choices available in the market today.


You first screen through hundreds of brands available in the market and then come to a final decision, based on the manufacturer’s credibility, warranty, services, etc. Then you need to decide the rating of your panel. A solar panel is available in a wide range of wattages and volts. We also receive many queries from our readers and potential buyers who are confused about the rating of the solar panel they wish to buy.


This blog is for those audience. It tries to differentiate between a 12V solar panel and a 24V solar panel. A 12V solar panel is generally suitable for small residences or projects of smaller size in contrast to a 24V solar panel. Other than this basic thumb rule, there are different technicalities to consider when deciding between the two. We have tried to differentiate between them basis five points:


  1. Compatibility with Battery
  2. Compatibility with Inverter
  3. Compatibility with Charge Controller
  4. Real Use Case (Applications)
  5. Range & Pricing

1. Compatibility with Battery

solar panel for single and double battery


The choice of the rating of a solar panel depends on the rating of the battery used. Generally, a 12V solar panel should be paired with a 12V battery and a 24V solar panel should be used with a 24V Battery. An important point to be noted here is that a 24V rating battery is not available in the market, but you can create one by joining two 12V batteries in a series connection.


  • 24V panel - 24V (2* 12V batteries in series connection)
  • 12V panel - 12V battery 
  • 6V Panel – 2/6V battery

2. Compatibility with Inverter

solar panel for 12v solar inverter

solar panel for 24v solar inverter

    Like the battery, solar panel should also be compatible with the rating of the inverter. For example, a 12V solar panel should be paired with a 12V inverter and a 24V solar panel should be used with a 24V inverter. Inverters are available in different ratings like 12V, 24V, 48V, etc. 


    • 12V battery - 12 V inverter - 12 V solar panel will be connected
    • 24V battery (connected in series) - 24V inverter - 24V solar panel will be connected

    3. Compatibility with Charge Controller

    solar panel for 12v and 24vsolar charge controller

    The rating of a charge controller should match with the ratings of the inverter and the battery. If a 12V battery and a 12V inverter is there, a 12V Charge controller should be used. Similarly, for 24V. One important thing to keep in mind here is that the solar panel’s rating should not be higher than that of the charge controllers. For instance, a 9 Ampere solar panel cannot be paired with a 6 Ampere charge controller.


    A Charge controller is available in a wide range of ratings from 6 Ampere to 53 Ampere. Solar panels are also available in different ratings e.g.


    • 10W Panel - 1 Amp
    • 20W Panel - 2.5 Amp
    • 180W Panel - 9 Amp
    • 350W Panel - 8-9 Amp

    4. Application

    solar panel 12v applications

       application of 24v solar panels

      A 12V solar panel can be used for different applications like street lights, tourist van, shops, small homes, home lighting, mobile charging, solar bag, science project, solar water pump, office, fishing boats, etc.


      A 24V solar panel can be used in big homes, hospitals, banks, offices, on grid applications like factories, apartments, parking, parks, government building, solar parks, etc. To see our case studies.

      5. Range & Pricing

      solar panel price range

      12V solar panel is available in 10W, 20W, 40W, 50W, 125W, 160W and 180W, whereas 24V is available in 330W and 350W.


      Price of a 12V solar panel can vary in between Rs. 2,400 and Rs. 15,000. Price of a 24V solar panel can vary in between Rs. 11,000 and Rs. 24,000.

      Solar Panel Buying Guide

      solar panel buying guide

      Customers are often confused as to how much load can be supported by solar panels. One important point to highlight here is that the function of a solar panel is to charge the battery and not to make appliances work. Let’s talk more about this in detail.


      Home load depends on inverter load capacity and back up power and time depends on the battery’s range. A panel’s range should be double that of the battery.


      Must read this example, a small home needs a minimum of 300 W to run a fridge, fan, and light which can be easily supported by a 1 kVa inverter. Let’s calculate and see what is the load of the house in use in case of a Power failure. Now, the time for which appliances will work on back up depends on the battery’s capacity. Typically a 150Ah battery with 12V rating can store upto 1800 W of power.


      Simple Calculation is 150 AH battery * 12V = 1800 W 


      Taking a lead acid battery with 70% efficiency only 1400 W load should be available and will work for 4-5 hours. Considering a small home needs a minimum of 300 W.

      Thumb Rule:

      solar panel calculation

      **Now let’s calculate in how much time will a battery be charged and how many solar panels are required to be installed, which are other common questions in the minds of the buyers.


      This depends on the sunlight’s availability. On an average, sunlight is there for 10 hours. So a battery will take:


      150/15 = 10 hrs 


      Assuming 150 Ah battery and 15 Amp of power, i.e. if the battery receives 15 Amp it will take 10 hours to charge.


      A Solar panel is typically 9 Amp, so typically 2-3 solar panels will be required.

      Watch Video


      Know how to charge battery from solar panel and how to know battery backup time


      This blog is dedicated for readers to decide as to how many solar panels they should buy to support the normal functioning of their house, in case of a power cut, what voltage of solar panel - 12V or 24V is suitable for you, and for how many hours my fan and lights will work on solar in case of a load shedding. A lot of this depends upon the ratings of the battery, inverter and charge controller. We hope we were able to help you to some extent. You can keep writing to us for more such queries in comment section.

      Previous article Loom Solar Introducing Mini Home Lighting System for Rural Areas


      Arun Babu K - April 18, 2021

      What will be the average units generated per day from a (2*440 =880 ) 880 watts mono perc panel in MPPT system given temperature is 35degree with 10 hours cloud free sun.

      Arun Babu K - April 18, 2021

      What will be the average units generated per day from a (2*375 =750 ) 750 watts mono perc panel in MPPT system given temperature is 35degree with 10 hours cloud free sun.

      Arun Babu K - April 18, 2021

      What will be the average units generated per day from a (4*180 =720 ) 720 watts mono perc panel in MPPT system given temperature is 35degree with 10 hours cloud free sun.

      Arun Babu K - April 18, 2021

      What is the difference if we connect two 180 watts mono perc panel 12volts to make a 24 volt system – vs purchasing a 375 watts mono perc single panel 24 volts . Kindly explain if any difference in efficiency – & units generated per day .

      Arun Babu K - April 18, 2021

      I have purchased two numbers loom solar 24 volts – 375 watts mono crystalline panel – But i have an existing 1000 va capacity inverter 12v system. I also bought 1600 VA MPPT charge controller which is automatic with both 12 volt and 24 volt compactable.
      Kindly help me to understand if i can connect both my 24 volt solar panel 375 watts to the 1000va 12 volt (150Ah one battery ) inverter system via the MPPT charge controller.

      Why i have asked this question is that – when i connected as i have mentioned above my system is only producing 1.6 watts from my 750 watts panel a day with good sunlight at temperature around 35 degree.

      Ted - March 23, 2021

      There’ll have been extra interest in solar power because of all those vehicles that had flat batteries from lack of use during lockdown – one of mine was affected.

      I’d gone out to one of mine last July and turned the ignition key and heard “click, click, click” etc. A totallly flat battery. I had one of those small 12v mini panels (with the optional cigarette lighter connector) and left it in the sunlight (it was a period of relatively cloudless days) having connected it directly to the battery on the sunday. I went out to the car on tuesday and the car fired up first time without effort. That “trickle charger that won’t charge up a flat battery” did exactly that in two days. I didn’t have a regulator connected and was lucky it didn’t cook the battery.

      It’s now March and I have the same problem with another car. I’d bought a flexible panel with a top output of I think 19v. On 15 March in direct sunlight at the azimuth it reached 12.5v and on 22 March 12.9v. Clearly, that panel isn’t going to charge that battery in direct sunlight until about the beginning of April (the output in cloudy overcast conditions is 7v). It will also stop charging about 15 September? as the sun will be too low. So, that’s about 6 months of there being not enough light for charging to be effective with a 12v panel. There’s no pount in me connecting that panel for another couple of weeks.

      My advice to anyone with the same issues about keeping a car battery charged is to get a panel that’s flexible and is rated 24v. You WILL need a controller/regulator to avoid the risks of frying the battery during the summer but it will put some charge into it on a cloudy day and will extend the “charging year” by quite a margin.

      So the question is – why doesn’t anyone sell a package that will keep a car battery trickle charged in a UK winter?

      Ajay Singh - January 27, 2021

      For 60 amp how many solar panel of 24 volt will be required

      Manoj.A.P - January 23, 2021

      I have a 1250va solar UPS with 12v battery, can I connect a 24v solar panel with it?

      thomas - October 3, 2020

      I have the Lg 335w solar panel
      The open circus voltage is 41.0
      Voltage at pmax 34.5
      So what is my solar voltage? 24v or 36v or 48v
      How can I choose the mppt and the inverter?

      Raju sonnad - September 15, 2020

      I have300 Watt voc46 vmp36 voltage solar panel how much capacity charge controller do I buy to charge 150Ah 12volt battery

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