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Post by Gary Lecomte on Dec 15, 2009 16:04:32 GMT -8
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Post by lamazoid on Dec 17, 2009 3:26:16 GMT -8
Interesting project!
I'm planning to experiment with solar energy next summer.
In final i plan to make a microcontroller based energy system for entire house.
But i'm new to microcontrollers and i like analogue electronics more, so this project will be good starting point of experiments for me.
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Post by Gary Lecomte on Dec 19, 2009 9:47:03 GMT -8
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Post by Deleted on Dec 21, 2009 15:12:13 GMT -8
 jeep, This circuit.... I think that it remember something to me, je, je,je Thanks, Gary. Anyway, here is what I have thinked... if someone want to comment it: First (seeing the schematic) It must connect the SHUNT(i+1) and, as the panel is a current source, the PANEL voltage go lower. If that resistor can't drain sufficient currrent to lower PANEL voltage to VREF= 14,5 (For example). The regulator will connect another resistor SHUNT(i) in this case. It will connect as many resistors as necesary until PANEL will be lower than VREF. And here is when a little of hysteresis can be useful to don't connect and disconnect a battery very rapidly. To prevent the case that all SHUNT can't drain all power from PANEL The last SHUNT must be a shortcircuit that drain all power from PANEL. When The lower hysteresis limit is reached The regulator will disconect as many SHUNTS as necesary to upper PANEL voltage IN ORDER. First it will disconnect SHUNT i-N, If it isn't sufficient, it will disconnect SHUNT i-(N-1), SHUNT i-(N-2).... It wil continue in this manner until it reach the equilibrium. Being N the number of shunts. The hysteresis, I don't know if it's better to regulate it by time, better than voltage... The idea is that the shunts resistor to be some applications..... What do you think about? Attachments:
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Post by Gary Lecomte on Dec 21, 2009 16:41:09 GMT -8
Well I'm Not sure it will work the way you expect it to.
Why don't you Prototype it for real, or at least a Simulation.
And a Referenced comparator would be better than just hystersis.
(Example: On at 13, Off at 14.5)
However, What are your Loads on your Shunts?
Running Directly from a Solar Panal usually isn't practical, Because of the Varying Voltage and Current.
That is Why I suggested to you: Additional Batteries as the Dump Loads. Then this Extra Power is Stored for when you REALLY NEED IT. Not just Wasted on loads that are not really needed.
I Realize Batteries are Expensive, But Wasted Power also make no sense.
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Post by Deleted on Dec 22, 2009 13:23:35 GMT -8
 About the simulation and functionallity.... you are in right, My circuit is bad, I had studing it more and it is bad. Any way it was only to show the general idea. I'll try to depurate it. and although actually I haven't a circuit program.... But I'll try to get one, and simulate it. The comparators... yes.. they work as I want to say with hysteresis by voltage, altough also can regulate it by time. The loads aren't connected directly to the solar panel alone, as I have sayed before. they are connected to the main battery that act as a great capacitor that compensate oscilations. and only are connected when there is a power excess... so, they don't get power from batteries. About the loads... What I want to connect are a little freezer, a water pump, a fan.... things that I can't waste energy from batteries to power them, but can be useful to use they in summer when there is a lot of energy. You say that a inductance load can't be powered with the solar panel directly, an I'm agree with you, but if you use the battery to relugate the peaks... I think that can be practical... And about the batteries, as I sayed you, Putting an additional battery.... you don't store more power because you put also more batteries... And it is as if you put a greater main battery... And batteries is the more expensive thing in a solar instalation.... I don't know if what I write can be understanded  ) But I try it  EDIT: I have found a circuit program that is shareware and can't put more etages but can be seen the funcion of circuit. putting another FF in the entry signal to aviod inestable entrys and putting CLK in short impulses that don't overlap the etages that follow seem to be effetive... Here is the idea with two etages: Attachments:
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Post by Gary Lecomte on Dec 22, 2009 19:58:41 GMT -8
Sorry but what your showing me Makes No Sense to me.
And I don't see how a Comparator can be Regulated by Time?
But Comparators can be built in Many Ways.
For Specific High and Low States, Hystersis is not the best way.
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Post by Deleted on Dec 28, 2009 13:33:31 GMT -8
;D Well, I have improved a little the design... Now each out is divided in two etages. The first Out11, for example, is conected when there is a excess of power. In that output you must connect a normal Resistor. When the power from panel is sufficient to sustain that load and don't alternate it, By the counter, that output Out11 is toggled to Out12 where you must connect a device that must be of the same drain of the resistor in Out11. With this design, I think that you don't damage the device for the rapid connect and disconnect of the regulation.... I think it can be useful..  Bye Attachments:
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Post by Gary Lecomte on Dec 28, 2009 14:15:04 GMT -8
If All you want to do is Add Additional Dump Loads, Your Circuit is becoming FAR TOO COMPLEX.
2 or more Dual Comparators, such as the LM393 can add 4 Dump loads at Precise Voltages. (Each LM393 is 2 Comparators)
And Loads are added via Triggered Mosfets or Relays.
Example:
1 Comparator set at 14.0 Volts on Battery, Triggers first added Load
If Battery Voltage Continues to Rise.
Second Comparator set at 14.1 Volts, Triggers Second Load
If Battery Voltage Still Continues to Rise.
Third Comparator set at 14.3 Volts, Triggers Third Load
If Battery Voltage Still Continues to Rise.
Fourth Comparator set at 14.4 Volts, Triggers Fourth Load.
AND MORE IF NEEDED.
BUT if your DUMP LOAD is Big Enough, there is NO NEED FOR MORE THAN ONE COMPARATOR.
This Shouldn't be so Difficult as you know your batteries Capacity and also the MAXIMUM Charge Current of All your Solar Cells.
Also Your Various LOADS Current Draws.
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jeep, This circuit.... I think that it remember something to me, je, je,je Thanks, Gary.
About the simulation and functionallity.... you are in right, My circuit is bad, I had studing it more and it is bad. Any way it was only to show the general idea. I'll try to depurate it. and although actually I haven't a circuit program.... But I'll try to get one, and simulate it. The comparators... yes.. they work as I want to say with hysteresis by voltage, altough also can regulate it by time.
) But I try it 
Bye