Oh No ! I bought a Mppt Solar Controller

Just a question. What is the conversion EFFICIENCY PERCENTAGE with various MPPT controllers. Are they all the same? The same efficiency?

Hmmm
Never did any test aside from plugging the system in and watching the amps go up. Next time I will check it and the ISC direct if I can get a amp meter.

What happens with Voc? That youtube guy mentioned how the cheap fake MPPT didn't have the voltage allowance to handle bigger 24v panels? Not clear on the specs for the $13 job.

BFL13 wrote:
I think all you can get with PWM is the Isc of the panel, whatever its voltage is. So to get that 13-14a from your 230w "24v" panel, you still need your MPPT controller AFAIK.

However, I don't have a clue about it getting over Isc (of 8a) when it is "in PWM mode" if it can. Perhaps it is still in MPPT, and not really in PWM when it is "in PWM" but the MPPT isn't doing much? Not a clue.

BFL
You have to remember the altitude I camp at. 10.000 ft has the opposite effect on my panels as it does on my generator. Even in Denver with the smog, I could see above the rated output of either of my panels in a short circuit test, then again that rating comes from sea level. Up in the clear air at 9-10,000 ft the ISC jumped 50%.

Looking forward to the review! I use the sunsaver mppt 15 amp charge controller (about $200) and if I could replace it with a $10 unit next time around I'd be happy to do so.

I think all you can get with PWM is the Isc of the panel, whatever its voltage is. So to get that 13-14a from your 230w "24v" panel, you still need your MPPT controller AFAIK.

However, I don't have a clue about it getting over Isc (of 8a) when it is "in PWM mode" if it can. Perhaps it is still in MPPT, and not really in PWM when it is "in PWM" but the MPPT isn't doing much? Not a clue.

Well I will still be interested in seeing how it does. Why, well because there are times when a PWM controller would have a advantage over a MPPT controller even with with my high volt panels. When it's cloudy early on and the battery is low, the MPPT controller will go into bulk. When it is cloudy the panels voltage drops and the controllers ability to use MPPT will drop to 1.78 for my 230w poly. I noticed this in testing last year and figured I was SOL if we had a cloudy week.
When we were camping it was cloudy every afternoon, yet since the controller was in float/PWM, I was getting 4-8a depending on the cloud cover and our loads. (even 5a in the rain)
It seems the lower voltage has the ability to push the PWM fine but not the MPPT function. For $13 I can have a usable solution to a cloudy week. Actually in full sunlight I was getting 13-14a in PWM anyways, I really wouldn't need MPPT at all.

Mex,

Well said.

O&S

Naw, I got LAAAAAZY and stuck a 20 amp Shottky Diode inline. At sundown, I got up, grabbed the towels and went and took a shower. Tough life, stripping mangoes off of trees, skinnin' 'em sticking the meat in a blender, sloshing in some Ron Castillo, some ice cubes, then leaning on the Pulse button for several seconds. By then the grandkids would come swinging through the trees demanding "Abuelito queremos dulce (Grandfather we want dessert)" and that was the end of that. I fixed the invasions. Load 'em up with chocolate (caffeine) with lots of artificial colors and turn them loose on their folks. I could hear the screams all the way across the arroyo.

The issue I have with my panels is there isn't total all-the-time sun. Where there is sun, you can fry two eggs, so sure as shootin' the top of the rig, the patio and computer room is shaded. I put the panels atop the chicken coop, the batteries and inverter, plus generator inside and send 600 volt power Via a transformer to the casa. A rodent but through the 600 volt wire a couple of years ago. SNAP! SIZZLE! The Trace 4024 sure can make that 5KW transformer hum!

The CFE power is only for the A/C. I put a 100 watt metal halide lamp 50 feet outside the patio. Wonderful light. All the critters, including scorpions and gechkos go there not onto the patio.

Going to make a 10 red LED porch light and test the theory that bugs are blind to red light. Of course that means taking the chance I'll have drunken campesinos knocking on my door all night.

This guy calls the WellSee a fake MPPT too. He talks about its "inductor" No idea what he is saying, not being a tech.

He says way down in the chat that MPPT has buck or boost or both. ISTR on here guys mentioning the buck transformer as what an MPPT has onto the PWM. So what is this (air?) inductor and is that what makes it fake?

http://www.youtube.com/watch?v=iUbYAZ4eCHw