Cadillac Jack wrote:
NinerBikes wrote:
Cadillac Jack wrote:
UGH! In my first post I said that I just bought a state of the art MPPT charge controller. So now I am supposed to trade it in on a 50 dollar PWM Chinese knockoff? ? ? ? ?
I have also mentioned numerous times that I cannot match my two 120 watt panels for multiple reasons!
A prior poster questioned why I would run my panels in series when My batteries are in parallel. DOUBLE UGH!
Of course my batteries are in parallel, I said so in my first post when I said I was running dual group 27 Trojans! Triple UGH!
Completely obvious and totally irrelevant.
Its a camper for crying out loud not a cabin.
So you bought a top of the line MPPT charge controller for $250, for a camper, when you have two mismatched 120W panels no longer made, and a 50W panel. A PWM would have handled all of that, no problem, with no ill effects... run them all the panels parallel, tie them in whereever,either at the input side of the controller, or at another junction box. 10 ga wire panels to controller will handle all the amps.
You sir quite obviously cannot read. Which is of course why you should not post replies to threads that YOU DO NOT READ! ! ! ! !
MY TWO 120 WATT PANELS ARE PERFECTLY MATCHED! What don't you understand about that? I then said on numerous occasions that I cannot put up another matching 120 watt panel because
A they are 72 cells and no longer made &
B I don't have the room
READ AND COMPREHEND!
You are the one that brought in the pablum of why I would run two panels in series while my batteries are in parallel. WTH ? ? ? ?
You brought a completely irrelevant argument to the table and then try to make me look stupid ???
If you had read the very first post in the thread, then you wouldn't be saying silly******about how my batteries are wired or why I don't buy a 50 dollar Chinese piece of crap!
For the love of God!
Title of thread "How to wire 2 controllers to my battery supply?" And now you have a MPPT. and $250 plus shipping missing from your account. And 72 cells for 120 w panels, but 36 cells and 18V for the 50 w panel
I'd sell the 72 cell panels, and for anything under 360 watts, I'd go to all 36 cell solar panels at 18V.
What a mix and match mess. Time for a complete overhaul. Same as needing a new 200 amp main panel at home. Remodel time.
I bought a brand new 150w 18V panel for $120, just the other day, I may pick up another... 300 watts, $240, out the door, brand new solar panels. 30 amp charge controller... $29, brand new. $269 for 300 watts. What am I missing here in the math? I am certain that at mid day, I'm good for 16.4 Amps at 15.0V with that set up.
As has been said before, the price per watt for 36 cell solar panels now is so low that it makes MPPT controllers no longer economically viable for much under 30 amps input at 17 or 18V on a 12V system.
