Puzzeling thru a 12v to 24v solar upgrade
Currently have 400w of 12v panels feeding four 6v US Battery 2200's in series/parallel.The 12V battery output goes to a 1000w inverter dedicated to a single plug output for computers. There is a Blue ...
Forum Discussion
glennts wrote:
@BFL13 "You don't get twice as much out of them when they are at 24."
Is the 24v at 40a going to put more into a 24v bank than 12v at 40a will put into a 12v bank? I understand that my usage is a constant but I what understand your comment to mean that there is no practical difference between the two when it comes to charging capacity. Is that correct?
If you try to charge two 100AH batteries as a 12v bank at 40 amps, you can get the same result by wiring them as a 24v bank and charging them at 20 amps. (but you need a "24v" charger)
If you use 40 amps at 24v, you would have the same charging time with four 100AH batts as with two at 12v, and now you would have twice as much you could use.
The controller is a "12/24" so it can do 12-12 or 24-24 or 24-12.
If you do 12-12 or 24-24, the output current will be in the same order as input current. If you do 24-12, output current is almost twice input current.
So if the bank is 12v it will use about twice the current output, but the same bank as a 24 will use the lower current to get to the same amount you can use from the bank.
To get the use of the 40 amps out at 24v you would want to double the size of the battery bank. But you don't need that much for your daily usage---unless you want to start using more with a bigger inverter and MW lots of food and watch longer movies. :)
