Photowhit wrote: »
In a discussion of "MPPT vs PWM" if your leaving out that the last 10% of charging is the same, What some(I) would call "...nears full charge ..." ...
And, as a group, we typically recommend not discharging more than 20%...
It is important in the understanding of the advantages of MPPT charge controllers.
..... Not the overall advantage which this fact is very important in the comparison of MPPT vs PWM.
westbranch wrote: »
You lost me Photowhit... I am assuming that you are saying that the last 10% of charging is NOT the same..
BUT how can this be? The absorb and float V settings 'should' be the same regardless of type of CC, Absorb is fixed V, decreasing A and Float is a fixed lower V as well, with a lower and tapering Amps.
I do not see any 'advantage MPPT' over PWM....??
niel wrote: »
do understand in general that i have nothing against pwm controllers and have had a few of them myself. also, understand that mppt does not create a power gain as i would better describe it as a power recovery from that which would've been normally lost just using a pwm style of cc. the controller is not creating anything, but rather is working with what it is presented with to be better utilized in charging the batteries through more current available from said power.
as to how you describe mppt is not quite accurate as you make it sound as if it is an addon to a pwm controller and that's just not quite right. it is, at the risk of oversimplifying, a dc to dc converter that has provision to self adjust for the changing input conditions it's presented with during the bulk stage. now during absorb or float it may act more like a pwm.
in operation the mppt wins hands down, but in the real world it may not always be cost effective for a small system as mppt costs quite a bit more than pwm. this cost aspect was not the aspect of the discussion i was addressing, however, it is worth considering. there are always factors that may sway one individual over another under the same general system setup. things like future expansion and long wire runs can be 2 of the influencing factors that i believe were mentioned already by bb, but often it will boil down to an individual's personal preferences and decision on what is good for them to go with.
niel wrote: »
we have been waiting for you to back up your claims for you to show us how it is i am wrong (on more than one issue too i might add) and all you do is call me a liar in so many words while you give an arrogant tight lip to my inquiries as to how i am wrong. others have told you repeatedly to stop the attitude and now i'm telling you to put up or shut up. i do not mind being told somebody feels that i am wrong and they need to state their case why they think this as others here have done. sometimes it is a misunderstanding of what is being said, but you say nothing in defense of your claims for anybody to even properly address by clarifying why you believe anybody is wrong.