Started by MountainDon, January 13, 2009, 02:18:39 AM
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Quote from: Squirl on March 28, 2011, 12:52:55 PMActually you need a 60 amp charge controller. Yes you are right that you have 11.23 amps coming in, but it when it converts the power out you have 50 amps at 12 volts. So you need a charge controller that doesn't only hand the amps coming in, but the amps it is putting out after the conversion. I'm actually disapointed in the Xantrex manuals that they don't lay this out. I read the Xantrex, Outback, and Morningstar manuals. You can see from the product manuals the maximum array size per controller at which battery bank voltage.Here are morningstar's mppt:http://www.morningstarcorp.com/en/tristar%20mpptAs you can see the maximun nominal for a 45 amp controller with a 12v battery can handle a 600 watt array, and the 60 amp maximum is 800 watts .Here is the Flex60:http://www.wholesalesolar.com/pdf.folder/controller%20pdf%20folder/flexmax60_specs.pdfPage 2 has the specs for the 60 amp version.12 VDC systems 750 Watts / 24 VDC systems 1500 Watts /48 VDC systems 3000 Watts / 60 VDC Systems 3750 WattsAgain, the "system" size voltage is the battery bank voltage, not the solar panel voltage.
Quote from: Squirl on March 28, 2011, 02:03:32 PMI think the remote display for outback was $150. I'm not really sure the necessity of the display because it just shows you the past performance.
QuoteHi Erik,The TSMPPT 45 can deliver up to 600W to a 12V battery bank. Using 615W will not damage the controller, the controller will simply limit the harvest to 600W.This, however, will be significantly more than what you will get with the C40 in your present configuration. The C40 will only be able to deliver up to the short circuit current rating of the array (likely 12-13A) in full sunlight. The TSMPPT 45 can deliver 45A with this array (in full sunlight).Regards,Adam KehlenbeckMS Technical Supportwww.email@example.com
Quote from: MountainDon on April 13, 2011, 10:01:17 PMhttp://www.midnitesolar.com/productPhoto.php?product_ID=197&productCatName=Breakers&productCat_ID=16
Quote from: MountainDon on April 18, 2011, 06:10:14 PMThere is likely little effective difference between those charger settings. I don't know or understand where the 0-30% and "lights" you refer to are coming from? On the low voltage reading.... don't forget that the voltage reading will drop lower faster when large loads are applied. If I microwave something for several minutes the instantaneous reading falls precipitously but then climbs back up to where it was. Also remember temperature effect. Hydrometers give most accurate readings for state of charge, and also require temperature corrections.
Quote from: MountainDon on April 18, 2011, 10:52:49 PMCould be. A hydrometer reading would clinch it. I use the voltmeter as a handy quick indicator to what's happening, but the hydrometer never lies when corrected for electrolyte temperature.