24 volt to 12 volt converter
Looking to run 600 watts of solar to my 40 amp MTTP controller at 36 volts. I have 4-6 volt batteries. So I need to get my 24 volt battery bank down to 12 volts to my Magnum 2012 inverter charger. ...
Forum Discussion
2oldman wrote:BFL13 wrote:With 24v he can pump more watts through the controller.
"now, your 40 A controller is too small for a 12 V system unless you intend to throw those watts away.. 40A*12V=480W and you waste 120W ! not an ideal situation"
I am not understanding this at all.
Yes, but with the 40 amp controller at "12v" he is only a tad over-panelled as seen in my earlier post calculation when he is getting full sun on his 600w array. He does not have a crisis situation where he needs a bigger controller at all.
In fact, as Morningstar keeps saying, some amount of over-panelling is a good thing with an MPPT controller, since it does have the self limiter feature (unlike a PWM controller that will fry if heated up by over amping it)
IMO he is well within the window for doing a bit of over-panelling and he would be crazy to buy a new controller or inverter or anything.
( I was over-panelled a little this summer with my MPPT set-up and it worked out just fine , just like Morningstar suggests. I was using a Tracer--same brand as the OP's from EP Solar and not a Morningstar but I think the same rule applies to all MPPT controllers--they all self-limit AFAIK. )
