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!
First you post that you have two 120 watt panels hooked up to an old PWM controller. Hooked up to 12v electrical system. That's telling me that you have 36 cell panels putting out 18V. Not 72 cell panels putting out 36V. You can't put 36V into a PWM charge controller and get 14.4V or a bit more going to your batteries.
Then you post you can't match them.
Then you post they are perfectly matched.
A few years back, folks were posting that adding watts with solar panels at a dollar a watt was making adding panels more cost effective than adding MPPT to small systems under 30 amps for 12V panels.
MPPT now only makes economic sense where large 225 to 250 watt panels at higher voltages can be bought for $.70 to .80 a watt, with multiple large panels, 3, 4, 5 or a bit more.
Google and Search function are your friend... it's already all in here. Posting conflicting nonsense will not make you popular around here.
