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Post by spiderbob on Mar 19, 2017 15:48:46 GMT -8
So correct me instead of playing games
I'm not being scarcastic, if I'm wrong explain it. I can take it, I try to explain what I know, now if I'm wrong I will learn so as not to tell someone else the wrong thing.
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Post by rabird on Mar 21, 2017 12:11:33 GMT -8
the OP is confused about a 'label' he or someone has decided to call some panels. Use them in grid tie for a grid tie system and I guess they are grid tie panels. Grid tie system uses a grid tie inverter between the panel and grid. Rip em off a house and use them with a charge controller to charge batteries and the same panels would not be considered grid tie. For 12v batt charging, 60 cell panels work fine with MPPT and may be a lot cheaper/watt that '12v' or 36 cell panels. The OPs 60 cell panels and his MPPT will work together, he needs MPPT to charge 12v batteries since the panel's Vmp ~ 29v. MPPT will allow his panels to operate @ Vmp (internal bucking will reduce charge voltage/increase amps) while PWM operates at batt voltage. When amps taper due to batt being charged, both MPPT and PWM turn on/off to limit overcharge. ON, MPPT operates at Vmp while PWM operates at batt voltage. OFF, both are disconnected and the panel is at Voc. on/off is too fast for my DVM! The OPs MPPT can handle either series or parallel connected panels. With PWM and '12v' panels, the Vmp is 17-18 and allows for some voltage drop in the wire and Vmp reduction due to panel heat, PANELS get HOT in the SUN, especially with little air gap mounted on a surface. noct www.pveducation.org/pvcdrom/modules/nominal-operating-cell-temperature |
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Post by spiderbob on Mar 21, 2017 16:30:26 GMT -8
Thanks, now if that don't confuse the OP  I'm only kidding - it's pretty clear as you wrote it. |
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I'm only kidding - it's pretty clear as you wrote it.