How to choose the right MPPT Charge Controller for solar

The second rating of a charge controller is the maximum input voltage that it can accept from the solar array. This is by far the most important rating as under-sizing your charge controller&#;s input voltage could damage it and void its warranty. Typically this is given as a range i.e 20-150V or just a maximum voltage i.e 250V. There is no harm in inputting less than the maximum voltage that the charge controller can handle but going over can permanently damage the controller. A solar array of at least 18V is recommended for the proper operation of your charge controller

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One external factor that you must consider in calculating your input voltage is the weather as cold weather can increase the voltage of your array. Most panels are rated in Voc based on standard test weather conditions of 25°C (77°F). You must base your calculations on the coldest it may get during daylight hours.

For example, if the Voc of your solar panel is 26.1V, and there are three connected in series, and it is 4°C on the coldest day, you would use the equation 26.1Voc x 3 in series x 1.10= 86.13V temperature compensated. That is great for a 100V rated charge controller but too high for a 75V.

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rmaddy said:

The length and size of the wire helps calculate voltage drop. Definitely worry about that when you are getting ready to buy the wire but I wouldn't worry about that when deciding which SCC to buy.

Something to consider though. You seem to be buying one piece of equipment at a time and then asking about the next one. That's far from ideal. It could lead to components that don't play well together or don't meet your needs as well as they could. I suggest working out every detail of your electrical/solar system before buying anything else. Figure out every component, every wire, every fuse, etc. and triple check it all works correctly and will meet your needs. Work up a wiring schematic and post here for review. People can double-check your choice of wire sizes and fuse sizes and ensure everything plays well together. Then you can go and buy it all knowing that what you are getting is the right stuff the first time.

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The only way I can get my head around it is to follow the flow and fill in the blanks. as
As I followed the flow I was told that I need to know what system I was building (12V or 24V or even 48V) so I headed to the battery and with help from you guys arrived at the Roamer 24V 230Ah. This is in the basket until I finalise every else.

Cabling is there in the mix at the back of my mind right now and I will defo be taking advice on this as I feel it's easy to undersize and create dangers. I thought that this would all need to be arranged after the components until I went through the calculator.

The only way I can get my head around it is to follow the flow and fill in the blanks. as @cs says i'm converting a van to live in so panels on the roof was the first place to start. At that stage I just bought the most output and put on as many as I could fit. Hence the 3 x 320W panels were purchased before they disappeared. This is the only item I actually have already.As I followed the flow I was told that I need to know what system I was building (12V or 24V or even 48V) so I headed to the battery and with help from you guys arrived at the Roamer 24V 230Ah. This is in the basket until I finalise every else.Cabling is there in the mix at the back of my mind right now and I will defo be taking advice on this as I feel it's easy to undersize and create dangers. I thought that this would all need to be arranged after the components until I went through the calculator. @cs I will be travelling in the UK until I know everything is working as expected but then I will be heading for the continent and following "Goldilocks" weather. North in the summer and south in the winter. Nothing too hot or too cold. That controller was one I was looking at earlier but I was getting a bit confused with all teh options and needed some sort of confirmation before I add to the basket.

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