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mikedeluco

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Posts: 3
Reply with quote  #11 
Thanks for all your help guys. I do have an MPPT Charge controller i bought on ebay for 35 bucks. But the price makes me suspicious. http://www.ebay.com/itm/20-30A-12V-24V-MPPT-Solar-Panel-Regulator-Charge-Controller-LED-Indicator-for-PV/311822392732?ssPageName=STRK%3AMEBIDX%3AIT&var=610687169803&_trksid=p2057872.m2749.l2649

Rsbhunter

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Posts: 8
Reply with quote  #12 
Mike,you might hook up the panel to the charge controller, and check the out put to the battery,with a battery hooked to it....especially the voltage......I recommend investing in "The Kid" MPPT charge controller, messing with this stuff becomes addictive! rsbhunter
stmbtwle

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Reply with quote  #13 
I would try the one you have. Max output is probably in the range of 260 watts, so it MAY overheat. Make sure it's well ventilated and watch it closely.

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Willie, Tampa Bay
Rick H Parker

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Reply with quote  #14 
"I do have an MPPT Charge controller i bought on ebay for 35 bucks."

The eBay seller did not spec out the MPPT charge controller very well, I would not of bought from him. Unless the charge controller came with a spec sheet there is no way to tell in advance if the panels and charge controller with play well together.

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Rick H Parker
Kansas, USA
Electronics Engineering Technologist
stmbtwle

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Reply with quote  #15 
One of the "pleasures" of shopping on Ebay...

Another thought: Pumping that kind of power into a single battery isn't likely to do it any good. I'd connect a second, identical battery in parallel with the first. You'll get better service and the batteries will last longer.

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Willie, Tampa Bay
Rsbhunter

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Posts: 8
Reply with quote  #16 
I looked at the MPPT charge controller on eBay you bought.I'm not saying that it won't work, but look at even the lower end of the price range of name brand (midnight solar, outback solar, etc ) MPPT chargers. There is not a cheap way out on MPPT charge controllers. If someone wants to experiment with solar, start with small 6 volt battery and panel(s). If someone wants to set up a solar system, for off grid or grid tie, plan on spending at the minimum a thousand dollars, for a system that will be balanced. My system at my off grid in Colorado is 12 Canadian 235 watt panels, Outback VFX3648 FP1-2, and a 48 volt 1100 ah fork lift battery. This is a set up for a medium size cabin and shop. If I only wanted to light a shop , I could've gone a lot less expense, and I still mess around with small solar panels (6 volt) and experiment with recharging batteries. One last thing, and anyone who lives on solar will tell you this, solar doesn't adjust to you, you adjust to solar....in other words, understand the capabilities of your system and live within it....it's a lot of fun, and a lot of info is gained by studying an building a system...have fun with it, be careful, and let us know how it goes....rsbhunter
Rsbhunter

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Posts: 8
Reply with quote  #17 
Went back and reread the "MPPT" charge controller description, it states "MPPT function" then " pulse width modulation" charging.....I would bet this is not a true mppt charger, so please be careful with a panel putting out more than twice the "normal" (for 12 volt) voltage thru it....
stmbtwle

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Reply with quote  #18 
Oops! I missed that about the "pulse width modulation charging" though I also was suspicious about the price. I guess the only way to know for sure would be to put hook it up with an ammeter in the circuit. Something like this should work, I have one for testing purposes and it works for me. Won't read both ways though.

http://www.ebay.com/itm/DC-100A-100V-Digital-Amp-Volt-Meter-Voltmeter-Ammeter-Blue-Red-LED-Current-Shunt-/282085879021?epid=703677119&hash=item41ada0eced

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Willie, Tampa Bay
Rsbhunter

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Posts: 8
Reply with quote  #19 
Exactly, as the saying goes, trust , but verify....solar is a super use of a free resource, and I find it super interesting to research and learn a lot of the theories and principals of solar...there are alot of forums and sites that give great, free advice and knowledge....rsbhunter
stmbtwle

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Reply with quote  #20 

"Solar is a super use of a free resource..."


Anyone who has ever owned a sailboat knows better. The wind is free, but sails are definitely NOT. Same for solar...

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Willie, Tampa Bay
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