AllSpark Battery Tray - 100ah ABS
$49.00
Need help?
(08) 6205 6868
Date Posted: 0000-00-00 00:00:00
So you've bought yourself a panel. You've done the research and made sure it is actually the number of watts stated and not some fabrication by the manufacturer. That's it right?
Well...unfortunately not. There is more to solar performance than just the panel.
Have you ever tried to drink a thick shake through a skinny straw? Doesn't work very well does it? No matter how much you try you can only get a certain amount through the straw at a time. Put in a large diameter and away you go! You get the flow you expect. This is a great analogy for explaining B&S/AWG cable sizing and voltage drop.
Put simply, the B&S/AWG is the standard gauge or size of a cable. The lower the number, however, the thicker the cable.
Trying to run a panel with an undersized cable can result in significant voltage drop. The amps produced won't really change, but the longer the cable to more the voltage drops. As you increase cable length, you need to increase the cross sectional area of the cable (mm2). If the cables are too small, you will get significant voltage drop. Whilst amps will stay mostly the same in a DC application, the more the voltage drops away, the lower the watts you get going into your battery.
It is very important to have your cables sized correctly.
Unfortunately, cables can be expensive (as anyone who has hooked up an inverter can attest, a longer cable can often work out to be the same, or more, than the cost of the unit itself!). Because of this, there is a huge problem with the cheaper panels on the market. Even if they are honest about the size of their panels (which so many budget brand sellers aren't), they more often than not will have undersized/flimsy cables which means you won't be getting the maximum power out of the panel. There are some brands/panels out there that have 17% voltage drop due to such a small cable. You therefore waste 17%-20% of your panel output with the wrong size cable.
Cable makers produce "4mm, 5mm & 6mm - Industry equivalent sizes". They neither describe the diameter, gauge or cross sectional surface area of the cable and are just an indicative number applied by cable makers rather than an accurate descriptor of the cable size as you can see from the table below. 6mm cable is where cable sizes become the most confusing for most people, as it's the most common size called for or used by 12v accessory installers for running sockets for fridges and power sockets from front to rear of vehicles.
Here's a table showing each of the different cable sizes commonly used in 12v applications in Australia:
How do you know what guage is correct for what size panel?
When sizing cables there is two requirements to take into account - current carrying capacity (amps it can handle) and length of cable in relation to voltage drop. This is relevent not just to solar but for any cables for any electrical load.
Take an example of a 200w solar panel that has a 5m cable. 10AWG cable is sufficient for this application as it can handle up to a maximum of 55 Amps and with only 4% voltage drop. This is what we used in our 2019 AllSpark ETFE 200w folding solar blankets. If you wanted to power the same blanket but with a 10m cable, if you still use 10AWG cable you would be getting 7-8% voltage drop. To avoid this voltage drop, you need to increase to the size of the whole cable to 8AWG which simply has more copper inside and can handle the power being transmitted down the cable.
Many panels on the market use 12AWG or even 14AWG which they have sized because it can handle the current, but given no thought to voltage drop. A 14AWG cable can still handle 30A (way more than the panel produces), but over 10m produce 17-18% voltage drop. That's the equivalent of a panel that produces 18v at the junction box, but only 14.9v getting out the other end or a loss of 33+ watts.
So if you have a panel already, and are wondering why it isn't producing enough power to keep you running, first check that it is the number of watts stated, then have a look at the cable. Same goes for if you are looking at purchasing one, ask the question of the seller, what is the AWG or B&S size, not the mm. If you can't tell, or aren't sure what to look for, send through a message to us directly to [email protected].
Welcome to our website. If you continue to browse and use this website, you are agreeing to comply with and be bound by the following terms and conditions of use, which together with our privacy policy govern Offroad Living’s relationship with you in relation to this website. If you disagree with any part of these terms and conditions, please do not use our website.
The term ‘Offroad Living’ or ‘us’ or ‘we’ refers to the owner of the website whose registered office is Unit 2/29 Prestige Parade, Wangara WA 6065. Our ABN is 61 161 507 106. The term ‘you’ refers to the user or viewer of our website.
The use of this website is subject to the following terms of use:
This privacy policy sets out how we uses and protects any information that you give us when you use this website. We are committed to ensuring that your privacy is protected. Should we ask you to provide certain information by which you can be identified when using this website, then you can be assured that it will only be used in accordance with this privacy statement. We may change this policy from time to time by updating this page. You should check this page from time to time to ensure that you are happy with any changes.
What we collect
We may collect the following information:
What we do with the information we gather
We require this information to understand your needs and provide you with a better service, and in particular for the following reasons:
Security
We are committed to ensuring that your information is secure. In order to prevent unauthorised access or disclosure, we have put in place suitable physical, electronic and managerial procedures to safeguard and secure the information we collect online.
How we use cookies
A cookie is a small file which asks permission to be placed on your computer's hard drive. Once you agree, the file is added and the cookie helps analyse web traffic or lets you know when you visit a particular site. Cookies allow web applications to respond to you as an individual. The web application can tailor its operations to your needs, likes and dislikes by gathering and remembering information about your preferences.
We use traffic log cookies to identify which pages are being used. This helps us analyse data about webpage traffic and improve our website in order to tailor it to customer needs. We only use this information for statistical analysis purposes and then the data is removed from the system. Overall, cookies help us provide you with a better website by enabling us to monitor which pages you find useful and which you do not. A cookie in no way gives us access to your computer or any information about you, other than the data you choose to share with us. You can choose to accept or decline cookies. Most web browsers automatically accept cookies, but you can usually modify your browser setting to decline cookies if you prefer. This may prevent you from taking full advantage of the website.
Links to other websites
Our website may contain links to other websites of interest. However, once you have used these links to leave our site, you should note that we do not have any control over that other website. Therefore, we cannot be responsible for the protection and privacy of any information which you provide whilst visiting such sites and such sites are not governed by this privacy statement. You should exercise caution and look at the privacy statement applicable to the website in question.
Controlling your personal information
You may choose to restrict the collection or use of your personal information in the following ways:
We will not sell, distribute or lease your personal information to third parties unless we have your permission or are required by law to do so. We may use your personal information to send you promotional information about third parties which we think you may find interesting if you tell us that you wish this to happen. If you believe that any information we are holding on you is incorrect or incomplete, please write to or email us as soon as possible at the above address. We will promptly correct any information found to be incorrect.