You’ll only need to change the fuse between the solar panels, the charge controller, the wire between the charge controller and busbar, and the fuse between the charge controller and busbar.

Wire size can decrease as voltage goes up, so…. Hey Sydnie! If we were to take 1000W, for example, then we simply need to divide this by its voltage input (supply voltage), which typically would be 240V. This would suggest, then, that a 4.16 Amp fuse would be acceptable.

However, if you have all of your power supplies and lights and are still unsure about calculating the correct fuse Amp then please see the below guide. For this example, we are going to wire the 12v distribution block to the bus bar then wire a string of lights to the 12v distribution block.All with appropriately fused with properly sized wires. Look at the green column and find the corresponding number. We have a blog post regarding how to size fuses here: However, we must also allow for an additional 20% higher Amperage fuse, much like we would add to our LED Strip calculation when determining the correct Drivers. How to calculate the correct fuse for your LED driver, Mains Dimmers vs DALI for LED strip brightness control, LED Driver Short Circuit and Over-current Protection, Calculating LED Strip controller current (Amps). Each device SHOULD have some kind of internal overcurrent protection in addition to the fuse protecting the wire. You can learn how to size all of that here:,, Work out how many LED lights you intend to wire. If you haven’t yet, check them out as they are a complete solution for a camper van electrical system. In the article you seem to use 1.5 and 1.25? Our installer hadn’t even marked the connections correctly! Make a note of the result. We’ll go into all the relevant details and what it … The top row refers to amperes the side column refers to wire distance.

Follow the amperes column down and the distance row across until they meet.,, LED circuit protection online at Littelfuse. A lot of components will tell you how big of wire and what kind of fuse to use. He has written various country profiles for inclusion in comprehensive market reports including Vision One Research and Investzoom Market Research. From what I can tell on the installation sheet, is that I need 2/0 wire, and it calls for a 240 amp T-fuse no more than 7″ from the battery. To see all of the individual guides, click here: There are 3 types of 12v fuses I recommend. Kinda lost right now. I prefer these on circuits that I know I may have to regularly ‘disconnect’ for maintenance and or troubleshooting. Are your LED Drivers suitable for mounting onto Combustible Surfaces? Thanks. As before, we need to multiply by an additional 1.2 to give 86.4W. If you haven’t seen it yet, I think the wiring diagrams found on would help you out immensely.

I’m planning to wire up 2 x 200W panels in series and for the future, I am counting on a max amperage of 10A coming from my panels. So, 1000/240 = 4.16. Also, would a Aims Power PICOGLF20W48V120VR Pure Sine Inverter Charger, 2000 Watt Low Frequency Inverter, 6000 Watt Surge work with my Victron MultiPlus Compact 12/2000/80-50 120V VE.Bus Inverter Charger? Please could you confirm if you multiply the amperage by 1.25 or 1.5? To get the amperes, divide the figure by 1,000, which will give you 5 amperes. Navigate to the wire gauge table at

I was just curious, I didn’t see you mention how you size the bus bars for the system. Step 1: Find the wire size for the 12v fuse block. There are a lot of steps to this and trust me, you’ll get faster at it with practice. We would then suggest that a 5A fuse will be perfectly suitable. Stevens holds a General Certificate of Education from Chelmsford College of Further Education. Most of the electricity an LED light consumes is converted into light, unlike regular light bulbs, where a lot of energy is lost as heat. If we start with a common household item, let's say a vacuum cleaner, this can be quite high in Watts. Spade fuses are the fuses that you’ll commonly find in your car’s fuse panel and are typically for items run out of your distribution block and less than 30 amps (in our case. As you can see, 5 amps is well within the 52.5 maximum fuse size threshold. I blew one recently using an air compressor on the vans 12v supply and it was a nightmare to fix. In addition to 120V LED lights, there are also various LED spots, spotlights and other light sources, which are operated with low-voltage.Usual operating voltages are 12V and 24V.An LED power supply is required to operate the low-voltage lamps on the 120V mains. I have 4 100watt renology solar panels and 3 100amp life po4 lithium batteries for my van conversion and don’t want to hook up getting energy from the motor or anything. They are Spade Fuses, ANL fuses, and Re-settable Breakers. If they blow/trip, they must be replaced. If there’s not an exact match, use the next highest number. I have one question, why is the resettable breaker in between the solar panel array and the charge controller rated at 15A? I cannot get RAKO to work with Mains Dimmable Drivers. For the “Distance from fuse block to appliance” we are going to go with the furthest light, which, let’s say, is 15 feet from the fuse block. Am I good with that? Your email address will not be published. Write down the result. Find the continuous amperage of the device you are trying to power and multiply that number by 1.5, then round up to the nearest fuse size you can find. Hey Nate, Very helpful site! Double the result: If the distance is 20 feet, you need 40 feet of wire. Refer to the wire distance you made a note of earlier. This is an in-depth fuse tutorial explaining everything you need to know about fuses and how to size a fuse. Most of the electricity an LED light consumes is converted into light, unlike regular light bulbs, where a lot of energy is lost as heat. Amperage = Power/Voltage. Now that you know how to size the fuses in your DIY Camper Van electrical system, it’s time to put everything you’ve learned to work. This is all great information as I’m starting my project. No such fuse exists, so go for 3A Next, we are going to determine how big of wire and fuse we need to wire a string of lights.  These 12v lights are the lights we are basing our example on.  We are going to install 2 packs of these 12v lights which will be a total of 8 lights.  The product page says these are 3 watts each.

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