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Old 05-10-2016, 12:45 PM   #29
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Sorry, but many don't consider 'Angry Bob' to be a guru!!!!

He is certainly opinionated!!!!


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Old 05-10-2016, 12:46 PM   #30
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Quote:
Originally Posted by 73shark View Post
As Clint Eastwood famously said,"A man has got to know his limitations."

One of my fav. quotes of all time!!!!


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Old 05-11-2016, 07:40 AM   #31
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Angry Bob does not suffer fools gladly, but I've heard his advocated basics echoed by other reputable sources, including segments in "This Old House" and it's "Ask" spin-off TV series. Especially on the issue of shadowing. *IF* Bob is correct in his shadowing loss calculations in the example that he provides, i.e., if a 3-panel assemblage can lose 30% due to minor shadowing, then that's effectively the same as losing the contribution of one of those three panels. That owner would do just as well functionally (and would save money) by re-configuring such that he installs two un-shadowed panels instead of three panels in which two are partially-shadowed.
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Old 05-11-2016, 11:51 AM   #32
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For the record, I did that installation and your comment on shadowing, while correct is NOT APPLICABLE to the photo you are referring to. I place panels with a primary concern to avoid any shadowing.

The 'shadow' that you think you are seeing is actually the cover of the raised Fantactic Fan. There is NO SHADOWING on that outer rear panel.

PV modules will effectively lose most of their output if even a small section is shaded, as all of the cells that make up that module are connected in series.

Depending on the section of a panel that gets shaded, you could lose a bit of the output or the entire panel's output.


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Old 07-22-2016, 06:38 PM   #33
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To UKDUDE...the shunt controller will not take a battery to full charge. It reaches a set point and shuts down, whereas the PWM and MPPT controllers will not stop charging until the battery is full....as long as there is sun available. I am sure the LEWSTER can provide a more accurate and detailed response...he is the master in this subject.
Question re: PWM vs MPPT:
  • I have a base system w/ 100w panel and 30w PWM
  • am considering adding either 1 or 2 add'l 100w panels
  • can the existing 30w PWM handle the 3 panels? would you swap it out for am MPPT? what are the trade-offs?

Thanks for any input
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Old 07-22-2016, 08:11 PM   #34
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Question re: PWM vs MPPT:
  • can the existing 30w PWM handle the 3 panels? would you swap it out for am MPPT? what are the trade-offs?

Thanks for any input
This post will help ya. http://www.airforums.com/forums/f240...ml#post1806655

All my research concludes no real benefit switching to a MPPT controller at our voltage and Solar Wattage size.
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Old 07-23-2016, 05:47 AM   #35
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I'm on day 3 with no hook ups. The 300 watts and good weather (sun) is recharging completely during the day. I'm dropping to 55% DOD over the evening. Frig is running 24 hours and fan during the afternoon. Nothing else. So I will be adding two additional batteries to store more reserve and allow more convenience items to be on. Pleased with the outcome so far.

This would be so easy for AS to plop an addition 200 Watts and I think most folks would be very satisfied. I will be replacing the 15 thermal breaker as I think it has popped at least a couple of times so I'm not able to take full advantage of the solar power available at peak charging. I've not seen 17 amps yet, but 16 regularly between 11:30 and 1.

When the below freezing charging issue is solved for Li I'm all in.
Curious about your amps. I have a 200w system and my monitor regularly shows 19-20 amps. Unless the monitor is faulty?
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Old 07-23-2016, 06:49 AM   #36
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Curious about your amps. I have a 200w system and my monitor regularly shows 19-20 amps. Unless the monitor is faulty?


The specs on your panels will indicate what their maximum current will be. I doubt 200 Watts would ever see that current. At least sustained. My 300 watts will tip over 20 amps on a rare occasion, but not long enough to cause a thermal breaker issue.
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Old 07-23-2016, 07:39 AM   #37
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The specs on your panels will indicate what their maximum current will be. I doubt 200 Watts would ever see that current. At least sustained. My 300 watts will tip over 20 amps on a rare occasion, but not long enough to cause a thermal breaker issue.
It really does show that current for much / most of the day. Could the monitor be set wrong or something? I know I have a good controller and good wiring.
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Old 07-23-2016, 03:24 PM   #38
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200W/12V=16.7amps max Might check monitor calibration if possible.
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Old 07-23-2016, 03:31 PM   #39
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When was the 50 watt solar panel upgraded to 100 W

First, solar modules do not have a 12 VDC output. It should be more like 19-21 VDC going into your charge controller.

I just finished a new 400 watt system that was showing a 23 amp output into the controller and 26.5 amps into the batteries at solar noon with a Blue Sky 3024iL controller.

I seriously doubt you will ever see 30 amps from 200 watts of solar regardless of the conditions.
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Old 07-23-2016, 09:01 PM   #40
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It really does show that current for much / most of the day. Could the monitor be set wrong or something? I know I have a good controller and good wiring.
Flex 100 Solar panel Specs
Max Voltage 17.5V
Max Current 5.71A
Short Circuit Current 6.28A

So something is not right.
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Old 07-24-2016, 12:49 PM   #41
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First, solar modules do not have a 12 VDC output. It should be more like 19-21 VDC going into your charge controller.

I just finished a new 400 watt system that was showing a 23 amp output into the controller and 26.5 amps into the batteries at solar noon with a Blue Sky 3024iL controller.

I seriously doubt you will ever see 30 amps from 200 watts of solar regardless of the conditions.
I'm a bit confused by the 3 posts from Lewster, Shark, and McRider, including Lewster referencing 30amps.

Anyway, Attached is a pic of my monitor. I might be misinterpreting the monitor, or it could be calibrated incorrectly. This is a 200w system (rigid panels) with 10g wiring, and a MPPT charger/controller. I don't really know solar, I'm just reading back the specs of a system someone else installed for me.

The reason I'm interested in this is whether to try to fit another panel (i.e. 300w total).

thanks for any input.

(btw ... how you folks insert an image as opposed to attaching?)
Attached Files
File Type: pdf Charging.pdf (1.89 MB, 27 views)
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Old 07-24-2016, 01:25 PM   #42
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Those are panel volts, not amps into the battery.

Repost pic for you:
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