Derating 24v Solar Panels?
I'm considering running two 250w/24v poly panels; tracked/pointed during spring/fall, and flat during the summer; thru the Tracer 3215BN 30a mppt controller. I can also get 200w/24v mono panels, local...
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I don't really understand your question, but point to one thing. If you have a 30 amp rated MPPT controller, it might be limiting output to just 30 amps because that is all it is rated to handle. So even with a potential of 500 watts in, you would only see the 400 +/- watts at 30 amps out.
You really should have a larger controller.
That said, I have a SB 50 that I spent a fortune on back in 1999. I think the cost was around $350 back then. Now they are a little less expensive, but still pretty high cost.
IF I was doing it all over again today, I would be using cheap PWM controller rated at 20 amps, and use several of these $20 controllers. One for each pair of panels, if they are putting out that many amps!
You can buy the 140 watt panels for $229 nowdays! SunElec.com
It is not like when I bought my 75 watt panel on sale for 'only' $375 in 1995. The original pair of 45 watt panels, controller and mounts, wire, ect cost $750 back in 1994, when wages where a lot lower than today.
AliExpress.com Search for 20 amp PWM controller. You will find several, and then search by price. Look for free shipping too.
Good luck on your projects!
Fred.
You really should have a larger controller.
That said, I have a SB 50 that I spent a fortune on back in 1999. I think the cost was around $350 back then. Now they are a little less expensive, but still pretty high cost.
IF I was doing it all over again today, I would be using cheap PWM controller rated at 20 amps, and use several of these $20 controllers. One for each pair of panels, if they are putting out that many amps!
You can buy the 140 watt panels for $229 nowdays! SunElec.com
It is not like when I bought my 75 watt panel on sale for 'only' $375 in 1995. The original pair of 45 watt panels, controller and mounts, wire, ect cost $750 back in 1994, when wages where a lot lower than today.
AliExpress.com Search for 20 amp PWM controller. You will find several, and then search by price. Look for free shipping too.
Good luck on your projects!
Fred.
