Solar Wiring Diagrams

How to join your solar panels & batteries together
& the different results (watts, volts, amps) created!


Solar pv panel and battery wiring diagrams.Now that you have reached the solar wiring diagrams section of this website, you are finally ready to learn how solar panels and batteries are wired together.

We are going to start with showing you some smaller solar systems (arranged in different ways to produce different results) and move on to bigger solar systems (arranged in different ways to produce different results). Each arrangement has it's own solar wiring diagram, so you can see exactly how it's done.

Remember, you don't need to start off by making all the energy you'll ever need, right away. You can get your feet wet by setting up your first solar system successfully, save a little bit of money at first, then do it over and over again as many times as you want!

Ok, let's look at some solar system arrangements YOU CAN COPY:



Solar Wiring Diagram #1:

A One Panel Solar System

The first solar power wiring diagram (arrangement) we'll look at consists of only one solar panel and a battery bank with one battery in it.

Solar Wiring Diagram

One Panel Solar System


Solar panel wiring diagram #1: One panel system

Although the system above wouldn't provide an awful lot of power, (certainly not enough to meets all your needs), it could be used to supplement some energy, save you a little bit of money and provide some limited convenience.

An arrangement like this would typically be used in a portable application powering appliances with low power ratings, like those often used in trailers and RVs.

For instance, if you have a certain appliance you would like to power like a laptop by the pool or a tv in your back yard shed or gazebo, then this type of solar application would provide a good affordable (but limited) energy solution.

Solar Panel Wiring Diagram #1
Usage and Limitations

Watts - The reason why this arrangement is limited is because with only one panel you can only produce up to 63 watts per hour maximum (under optimal sunlight conditions).

Battery - With only one battery, you can only store one battery worth of power. Since your battery can store 105 amp hours (105 amps total in the period of one hour) worth of energy, you'll have to spread those amp hours out according to the amp ratting of your appliance for as long as you can. If you stick to small appliances with small power loads you should be able to get some minimal energy savings with this system in optimal sunlight.

That might seem great but if you started adding more appliances and power loads, you would likely run out quick. Also for the health and life span of your battery, you should try to never discharge your batteries more than 30% empty. As a result, this limits your available power even more.

Amps - Furthermore, your system would only have 3.5 amps (of current speed) so you would be producing power or charging your battery kind of slow.

Volts - And with only 18 volts (panel) and 12 volts (battery bank), you would only be able to charge appliances with a lower voltage rating, like 12 volt but not 24 volt or higher.



But don't get too discouraged, this solar arrangement is still useful and practical, as long as you don't expect too much out of it.


Solar Wiring Diagram #2:

A Two Panel Solar System

The second solar power wiring diagram (arrangement) we'll look at consists of two solar panels and a battery bank with two batteries in it.

With a two panel solar arrangement, we have a few more options in terms of wiring. By this I mean that we now have the choice of wiring our two panels (and batteries) using series wiring or parallel wiring.

Series wiring 

Series wiring is when you connect your panels (or batteries) positive to negative, negative to positive, etc and it is used to increase the overall volts.

Parallel wiring

Parallel wiring is when you connect your panels (or batteries) positive to positive, negative to negative, etc and it is used to increase the overall amps.



Here is an example of the same two panels wired in both series and in parallel. If you're going to be using two solar panels / batteries in your system, you can follow one of the diagrams below, depending on what's more important to you: Volts (so you can power bigger appliances) or Amps (so you can charge your batteries faster). With this small amount of solar panels / batteries we can't do a combonation of both, so it's either one or the other.

Solar Wiring Diagram

Two Panel Solar System




Wiring diagram : 2 solar panels in series and in parallel.

Comparison between series and
parallel (2 panel / battery) wiring.

Although the two solar arrangements above don't offer the most power or storage capacity, (certainly not enough to meets all your needs), they do give you more to work with.

For instance: With the "series" arrangement above, you could now power a 24 volt appliance and wouldn't have to stick only to low voltage appliances commonly used outdoors in trailers or RVs. However if you are using appliances with low voltage ratings anyway (like if you're in a camper) then you might prefer the "parallel" arrangement because you'll be able to charge your batteries faster and store more energy per available daylight hours.

Solar Wiring Diagram #2
Usage and
 Limitations

Series Wiring - Two Panel Solar System

Watts - Since we are now working with two panels, this solar system will output 144w of power per hour maximum (under optimal sunlight conditions). Still not the most power, but much better than the one panel system in our first example. Watts remain the same with both series and parallel wiring.

Battery - With two solar panels and two batteries wired in series, your battery's storage capacity stays the same: 105 amp hours - so your battery can store 105 amps total in the period of one hour. This is a low storage capacity.

Amps - With two solar panels and two batteries wired in series, your amps remain the same at 3.5 amps so you won't increase your charging speed.

Volts - With two solar panels and two batteries wired in series, your panels' volts increase to 36 volts and your battery bank's volts go to 24 volts which means you'll be able to power up to 24 volt appliances.


Parallel Wiring - Two Panel Solar System

Watts - Since we're now working with two panels, this solar system will output  144w of power per hour maximum (under optimal sunlight conditions). Still not the most power, but much better than the one panel system in our first example. Watts remain the same with both series and parallel wiring.

Battery - With two solar panels and two batteries wired in parallel, your battery capacity increases to 210 amp hours - so your battery can store/spend 210 amps total in the period of one hour. This gives you better storage capacity, but the trade off is your battery bank's voltage remains small at 12 volts. If you stick to small appliances with small power loads, you should be ok.

Amps - With two solar panels and two batteries wired in parallel, your amps increase to 7 amps which means you'll be able to charge your battery bank faster and take better advantage of available daylight hours.

Volts - With two solar panels and two batteries wired in parallel, your volts remain the same at 18 volts (panels) and 12 volts (battery bank) so you will only be able to charge a 12 volt battery bank and thus power up to 12 volt appliances.



Although, there are obviously still many limitations with the two panel /battery arrangement (series & parallel) discussed above, as you can clearly see, there are also some advantages that you can benefit from. If you are only supplementing some of your home's power or using your system to power RV type appliances than this arrangement allows you to pick a balance that can be more practical to your needs.


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Solar Panel Wiring Diagram #3:

A Four Panel Solar System Wired in Series & Parallel

The next solar power wiring diagram (arrangement) we'll look at consists of four solar panels and a battery bank with four batteries in it.

With four panels we clearly have enough of them to arrange them using a combination of series and parallel wiring. We do this because it provides a better balance of volts and amps, instead of tipping the scales only to one side (like with just straight series or straight parallel wiring).

Here is an example of four panels wired in a combination of series and parallel. If you're going to be using four solar panels / batteries in your system, you can follow the diagram below for a good balance of volts, amps and watts.

Solar Wiring Diagram

Four Panel Solar System



Solar wiring diagram : 4 panels in series and parallel

Now this is a little better. Although the solar arrangement above isn't the biggest, it does provide reasonable amounts of power, load delivery and storage capacity.

With the series / parallel arrangement above, you can now power a 24 volt appliance, while charging your batteries faster (7 amps) thus storing more energy per available daylight hours, plus you get 210 amp hours of storage capacity.

Solar Wiring Diagram #3
Usage and
 Limitations

Series / Parallel Wiring - Four Panel Solar System

Watts - Since we connected two groups of two panels together in series and parallel, this solar system will output 252w of power per hour maximum (under optimal sunlight conditions). This is an ok amount of power and you should start to notice some better energy savings now, however this set up still has it's limitations.

Battery - With two groups of two panels / batteries wired in series and parallel, your battery capacity increases to 210 amp hours - so your battery can store/spend 210 amps total in the period of one hour. This is a better storage capacity.

Amps - With two groups of two panels / batteries wired in series and in parallel, your amps increase to 7 amps which means you'll be able to charge your battery bank faster and take better advantage of available daylight hours.

Volts - With two groups of two panels / batteries wired in series and in parallel, your panels' volts increase to 36 volts and your battery bank's volts go to 24 volts which means you'll be able to power up to 24 volt appliances.


While this four panel series / parallel arrangement helps to add some balance to our solar system by bringing the volts and amps up to an acceptable level, it's still not enough power to give us an awful lot of flexibility or freedom.

For instance we still can't power 48 volt appliances.

But let's see what happens if we wire four panels in series.




Solar Panel Wiring Diagram #4:

A Four Panel Solar System Wired in Series

Now we'll look at the same four panel solar arrangement as above, expect we will wire the panels and batteries together only in series.

Although this system is not necessarily one that many would use (most would likely prefer the previous more balanced system because more balance extends battery life), the main reason for somebody choosing this arrangement would be to increase the volts high enough to power 48 volt appliances. Of course, you will be sacrificing some amps (charging speed), and amp hours (storage capacity), but if powering up to 48 volt appliances is want you want, you will accomplish this.

Here is an example of four panels wired in series. If you're going to be using four solar panels / batteries in your system, it's better to use the more balanced previous example, but if you absolutely need to power 48 volt appliances on a tight budget, this is how to do it.

Solar Wiring Diagram

Four Panel Solar System



Solar power wiring diagram : 4 panels wired in series

Although the solar arrangement above isn't the best for the long term life of your battery because there is more stress on the system, it does provide a way to reach the capability of a bigger system without having to add more panels / batteries.

With the series arrangement above, you can now power a 48 volt appliance, but you'll charge your batteries slower (3.5 amps) thus make less energy per available daylight hours, plus you only get 105 amp hours of storage capacity.

Solar Wiring Diagram #4
Usage and
 Limitations

Series Wiring - Four Panel Solar System

Watts - Since we connected four panels together in series, this solar system will output 252w of power per hour maximum (under optimal sunlight conditions). This is the same wattage as the previous 4 panel system and has an ok amount of power. You should start to notice some better energy savings now, however this set up has it's limitations.

Battery - With four panels / batteries wired in series, your battery capacity stays at 105 amp hours - so your battery can store/spend 105 amps total in the period of one hour. This is a low storage capacity.

Amps - With four panels / batteries wired in series, your amps remain at 3.5 amps which means slower charging speeds and you won't be able to take full advantage of available daylight hours.

Volts - With four panels / batteries wired in series, your panels' volts increase to 72 volts and your battery bank's volts go to 48 volts which means you'll be able to power up to 48 volt appliances.


While this four panel series arrangement helps to tilt the scales in the voltage favor, it also decreases some other very important factors, that you may not want to give up. The choice is yours.


Solar Panel Wiring Diagram #5:

An Eight Panel Solar System Wired in Series & Parallel

The next solar power wiring diagram (arrangement) we'll look at consists of eight solar panels and a battery bank with eight batteries in it.

With eight panels we clearly have enough of them to arrange them using a combination of series and parallel wiring. We do this because it provides a better balance of volts and amps, instead of tipping the scales only to one side (like with just straight series or straight parallel wiring).

Here is an example of eight panels wired in a combination of series and parallel. If you're going to be using eight solar panels / batteries in your system, you can follow the diagram below for a good balance of volts, amps and watts.

Solar Wiring Diagram

Eight Panel Solar System



Solar panel diagram : 8 panels

Ok, now were making some better energy production. Our power is up, our load delivery is good and our storage capacity is good.

With the series / parallel arrangement above, you can now power a 48 volt appliance, while charging your batteries fast (7 amps) thus storing more energy per available daylight hours, plus you get 210 amp hours of storage capacity (which is better that 105 amp hours).

Solar Panel Wiring Diagram #5
Usage and
 Limitations

Series / Parallel Wiring - Eight Panel Solar System

Watts - Since we connected two groups of four panels together in series and parallel, this solar system will output 504w of power per hour maximum (under optimal sunlight conditions). This is a good amount of power.

Battery - With two groups of four panels and batteries wired in series and parallel, your battery capacity is at 210 amp hours - so your battery can store/spend 210 amps total in the period of one hour. This is a pretty good storage capacity.

Amps - With two groups of four panels / batteries wired in series and in parallel, your amps are at 7 amps which means you'll be able to charge your battery bank fast and take better advantage of available daylight hours.

Volts - With two groups of four panels / batteries wired in series and in parallel, your panels' volts increase to 72 volts and your battery bank volts go to 48 volts which means you'll be able to power up to 48 volt appliances.



The eight panel series / parallel arrangement helps to add some balance to your solar system by bringing the volts and amps up to a good level, while producing enough power for some moderate energy flexibility and freedom.


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Solar Panel Wiring Diagram #6:

A Sixteen Panel Solar System Wired in Series & Parallel

The next solar power wiring diagram (arrangement) we'll look at consists of sixteen solar panels and a battery bank with sixteen batteries in it.

With sixteen panels we clearly have enough of them to arrange them using a combination of series and parallel wiring. We do this because it provides a better balance of volts and amps, instead of tipping the scales only to one side (like with just straight series or straight parallel wiring).

Here is an example of sixteen panels wired in a combination of series and parallel. If you're going to be using sixteen solar panels / batteries in your system, you can follow the diagram below for a good balance of volts, amps and watts.

Solar Wiring Diagram

Sixteen Panel Solar System


Solar wiring diagram : 16 panels
Series and parallel wiring


This is more like it. Our power is up, our load delivery is up and our storage capacity is up.

With the series / parallel arrangement (in the solar panel wiring diagram above), you can power 48 volt appliances, while charging your batteries faster (14 amps) thus storing more energy per available daylight hours, plus you get 420 amp hours of storage capacity. The is a great power reserve.

Solar Panel Wiring Diagram #6
Usage and
 Limitations

Series / Parallel Wiring - Sixteen Panel Solar System

Watts - Since we connected four groups of four panels together in series and parallel, this solar system will output 1008w of power per hour maximum (under optimal sunlight conditions). This is a great amount of power.

Battery - With four groups of four panels and batteries wired in series and parallel, your battery capacity is at 420 amp hours - so your battery can store/spend 420 amps total in the period of one hour. This is a great storage capacity.

Amps - With four groups of four panels / batteries wired in series and in parallel, your amps are at 14 amps which means you'll be able to charge your battery bank faster and take better advantage of available daylight hours.

Volts - With four groups of four panels / batteries wired in series and in parallel, your panels' volts are at 72 volts and your battery bank's volts are at 48 volts which means you'll be able to power up to 48 volt appliances.


This sixteen panel series / parallel arrangement adds some balance to your solar system by bringing the volts and amps up to an acceptable level while providing enough power, charge speed and storage capacity to handle most energy needs. You can now begin to enjoy some real energy independence.

But what if you want to power 120 volt appliances?

Then you'll need to add some stress to your 16 panel /battery solar system by wiring it only in series (next).


Solar Panel Wiring Diagram #7:

A Sixteen Panel Solar System Wired in Series

Now we'll look at the same sixteen panel solar arrangement as above, expect we will wire the panels and batteries together only in series.

Although this system is not necessarily one that many would use (most would likely prefer the previous more balanced system because more balance extends battery life), the main reason for somebody choosing this arrangement would be to increase the volts high enough to power 120 volt appliances. Of course, you will be sacrificing amps (charging speed), and amp hours (storage capacity), but if powering up to 120 volt appliances is what you want, you will accomplish this.

Here is an example of sixteen panels wired in series. If you're going to be using sixteen solar panels / batteries in your system, it's better to use the more balanced previous example, but if you absolutely need to power 120 volt appliances on a tight budget, this is how to do it.

Solar Wiring Diagram

Sixteen Panel Solar System



Wiring solar panels diagram : 16 panel


Although the solar arrangement in the solar panel wiring diagram above isn't the best for the long term life of your battery because there is more stress on the system, it does provide a way to reach the capability of a bigger system without having to add more panels / batteries.

With the series arrangement above, you can now power 120 volt appliances, but you'll charge your batteries slower (3.5 amps) thus store less energy per available daylight hours, plus you only get 105 amp hours of storage capacity.

Solar Panel Wiring Diagram #7
Usage and
 Limitations

Series Wiring - Sixteen Panel Solar System

Watts - Since we connected 16 panels together in series, this solar system will output 1008w of power per hour maximum (under optimal sunlight conditions). This is the same wattage as the previous sixteen panel system and thus has a great amount of power.

Battery - With sixteen panels / batteries wired in series, your battery capacity stays at 105 amp hours - so your battery can store / spend 105 amps total in the period of one hour. This is a low storage capacity.

Amps - With sixteen panels / batteries wired in series, your amps remain at 3.5 amps which means slower charging speeds and you won't be able to take full advantage of available daylight hours.

Volts - With sixteen panels / batteries wired in series, your panels' volts increase to 288 volts and your battery bank's volts go to 192 volts which means you'll be able to power up to 120 volt appliances.



While this sixteen panel series arrangement helps to tilt the scales in the voltage favor, it also decreases some other very important factors, that you may not want to give up. The choice is yours.

 


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Solar Panel Wiring Diagram #8:

A Thirty Two Panel Solar System Wired in Series & Parallel (using four groups of eight).

The next solar power wiring diagram (arrangement) we'll look at consists of thirty two solar panels and a battery bank with thirty two batteries in it (using 4 groups of 8 panels / batteries).

Due to the fact that we now have more panels to work with, we can arrange our solar panels/batteries using a combination of series and parallel wiring. But that's not all, we can now try grouping them differently, so we'll start by using four groups of eight. This arrangement will provide a better balance of volts and amps, instead of tipping the scales only to one side (like with just straight series or straight parallel wiring).

Here is an example of thirty two panels wired in both series and in parallel. If you're going to be using thirty two solar panels / batteries in your system, you can follow the diagram below for a good balance of volts, amps and watts.

Solar Wiring Diagram

Thirty Two Panel Solar System


Using four groups of eight

32 panel solar system
Wired in series and parallel


Now were making some energy! Our power is good, our load delivery is up and our storage capacity is up.

With the series / parallel arrangement in the solar panel wiring diagram above, you can power a 48 volt appliance, while charging your batteries faster (14 amps) thus producing / storing more energy per available daylight hours, and you get 420 amp hours of storage capacity which is great.

Solar Panel Wiring Diagram #8
Usage and
 Limitations

Series / Parallel Wiring - Thirty Two Panel Solar System (4 groups of 8)

Watts - Since we connected thirty two panels together in series and parallel, this solar system will output 2016w of power per hour maximum (under optimal sunlight conditions). This is a pretty good amount of power and should be able to meet most of your energy needs.

Battery - With four groups of eight panels and batteries wired in series and parallel, your battery capacity is at 420 amp hours - so your battery can store/spend 420 amps total in the period of one hour. This is a great storage capacity.

Amps - With four groups of eight panels / batteries wired in series and in parallel, your amps are at 14 amps which means you'll be able to charge your battery bank faster and take better advantage of available daylight hours.

Volts - With four groups of eight panels / batteries wired in series and in parallel, your panels' volts are at 144 volts and your battery bank's volts are at 96 volts which means you'll be able to power up to 48 volt appliances.



This thirty two panel series / parallel arrangement adds some balance to a bigger sized solar system by bringing the watts and amps up to a great level which means you get great power and faster charging. The only drawback is that you can't power 120 volt appliances. If this is important to you, you'll have to use the next arrangement.


Solar Panel Wiring Diagram #9:

A Thirty Two Panel Solar System Wired in Series & Parallel (using two groups of sixteen).

The next solar power wiring diagram (arrangement) we'll look at consists of thirty two solar panels and a battery bank with thirty two batteries in it.

This time we'll be wiring our panels / batteries together in series and parallel using two groups of sixteen. We do this to raise the volts, this way we can power 120 volt appliances. Unfortunately, this will reduce our charging speed (amps) and storage capacity (amp hours).

Although this type of wiring may put a little more stress on your solar system, the benefit is often worth it. After all, you can't get anything without a little bit of sacrifice.

Here is an example of thirty two panels wired in series. If you're going to be using thirty two solar panels / batteries in your system, it's better to use the more balanced previous example, but if you absolutely need to power 120 volt appliances without adding more panels / batteries, this is how to do it.

Solar Wiring Diagram

Thirty Two Panel Solar System


Using two groups of sixteen

32 panel solar system
Wired in series and parallel


Ok, that brought our volts up. However it slowed down charging speed and decreased our storage capacity a little.

With the series / parallel arrangement in the solar panel wiring diagram above, you can now power a 120 volt appliance, while charging your batteries at an acceptable speed (7 amps) thus storing a pretty good amount of energy per available daylight hours, and you get 210 amp hours of storage capacity which is acceptable.

Solar Panel Wiring Diagram #9
Usage and
 Limitations

Series / Parallel Wiring - Thirty Two Panel Solar System (2 groups of 16)

Watts - Since we connected thirty two panels together in series and parallel, this solar system will output 2016w of power per hour maximum (under optimal sunlight conditions). This is a pretty good amount of power and should be able to meet most of your energy needs.

Battery - With two groups of sixteen panels and batteries wired in series and parallel, your battery capacity is at 210 amp hours - so your battery can store/spend 210 amps total in the period of one hour. This is an acceptable  storage capacity.

Amps - With two groups of sixteen panels / batteries wired in series and in parallel, your amps are at 7 amps which means you'll be able to charge your battery bank fast and take good advantage of available daylight hours.

Volts - With two groups of sixteen panels / batteries wired in series and in parallel, your panels' volts are at 288 volts and your battery bank's volts are at 192 volts which means you'll be able to power up to 120 volt appliances.



While this thirty two panel (2 group of 16) series / parallel arrangement helps to tilt the scales in the voltage favor, it also decreases some other factors. However due to the fact that we have a lot of panels to work with, the sacrifice is not that drastic.

As a result, you get great power, pretty good charge speed and acceptable storage capacity, along with some true measure of real energy independence. Now that wasn't that hard, what is?

Remember, if you use bigger solar cells to build your solar panels you can effectively raise most of the above values drastically and thus won't require such a big solar energy system to meet your specific power needs. This bigger your solar panels' output is, the less of them you have to join together. 


Here is a quick reference chart of all of the above info:

Solar Panel Wiring Diagrams (Quick Reference Chart)

SYSTEM

Watts
(Power)

Volts
(Panels)

Volts
(Batteries)

Amps
(Charge Speed)

Ah
(Storage Capacity)

1 Panel

63

18

12

3.5

105

2 Panel (Series)

126

36

24

3.5

105

2 Panel (Parallel)

126

18

12

7

210

4 Panel (Series/Parallel)

252

36

24

7

210

4 Panel (Series)

252

72

48

3.5

105

8 Panel (Series/Parallel)

504

72

48

7

210

16 Panel
(Series/Parallel)

1008

72

48

14

420

16 Panel (Series)

1008

288

192

3.5

105

32 Panel
(Series/Parallel)
4x8

2016

288

96

7

420

32 Panel
(Series/Parallel)
2x16

1008

288

192

3.5

105



Now that you have reviewed every solar arrangement above and have some idea of how to build the size of solar system you'll need, click here to go back to the Wiring Solar Panels section in the exact spot you left off (or just click your browser's back button).


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