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Rick H Parker

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Reply with quote  #31 

Max. PV open circuit voltage states

100V(at minimum operating environment temperature) 92V(at 25℃ environment temperature)

Is that safe to assume it's ok?

Depends, total open circuit voltage need to be less then 92V at 25℃ and with that charge controller. I would give a margin to accommodate other temperatures.


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Rick H Parker
Kansas, USA
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Rick H Parker

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Reply with quote  #32 
My car is rated for a capacity of 240 Horsepower. I don't drive around with the engine transferring energy at the rate of 240 Horsepower ... do you drive around with your engine at maximum transfer capacity?

A solar panel array is like the engine in your car, it will supply what is requested on demand up to it's maximum capacity.

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Rick H Parker
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stmbtwle

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Reply with quote  #33 
Rick, how do you get 60v (or even 50) from a 24v panel? Please explain.
Even my 41v Sunpowers only max out at 46v.


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Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
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Reply with quote  #34 
Hmm. I was going to ask the same.
Rick H Parker

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Reply with quote  #35 
Rick, how do you get 60v (or even 50) from a 24v panel? Please explain.

Some place back there he said open circuit voltage of 60v. When I wrote that I was thinking 60V per panel. Digging through, I found it again, he was saying 60V for four "12V" panels in series. 

It would help if people would list the open circuit voltage. "12V, 24V, 48V" panels is pretty much meaningless.

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Rick H Parker
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Reply with quote  #36 
I do like the way you guys use analogies. Helps me understand.
I have a 1970 series 3 land rover so I know nothing about 240 HP. However I do have 3 real ones in our stable. They also get a bit hot when pushed. Hey Willie. Can you give me another analogy for Amps along the lines of a tandem bicycle?
stmbtwle

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Reply with quote  #37 
MYup.

Remember that we're looking at two different systems here. For some reason the 24v panels wouldn't charge the 24v batteries (might have been in parallel with a PWM controller).

In series with an MPPT they should be able to.

OK Mike here you go. In a tandem bike you have two guys in "series", one is "pushing" the other and wind resistance is less (racers do it all the time).

Now compare one of those pedal "buggies" where the guys are sitting side by side in "parallel". The input power is the same, but the resistance is greater, so the effective power is less.

Rick might have a better one.


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Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
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Reply with quote  #38 
Hey Rick. Scared me there for a minute.
Rick H Parker

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Reply with quote  #39 

Don't need a new analogy.
Watts (Power) is the rate of Energy transfer = Joules/seconds.
Amps (Current) is the rate of Charge transfer = Coulombs/second. 
They are both rates, the analogy applies to both.


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Rick H Parker
Kansas, USA
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Reply with quote  #40 
Think Willie wins that one Rick.
Yours reminds me of the words of a Harry Belefonte song
"it was clear as mud but it cover the ground."
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