My greenhouse Solar experiment |
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| I am using a 12 volt / 20 watt Solar PV panel, a Sunsaver Charge controller and two 12volt deep cycle batteries. I made a couple custom circuit boards to monitor the greenhouse. The sensors in the boards below all operate over a Dallas One wire network that is connected to a PC. The Dallas one wire sensors include several temperature sensors, humidity sensors, solar sensor and voltage/current sensors. I can turn on and off pumps, fans, what ever, via custom software based on sensor readings. |
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| Click on the image below for a larger image |
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| Here are two of my voltage reading/current sensing boards. One board is reading the Battery voltage and the load current being drawn from the batteries. The other board is reading the PV panel voltage and PV panel charge current. The Green and Red data wires above go to the Dallas one wire network where they are read by my custom software program. |
| The Sunsaver charge controller shown above, controls the charge to the batteries and the loads. It will shut the charge level down to a trickle charge when the batteries are full. It also monitors the load and will shut the load off if the battery voltage falls to a certain level. This protects the batteries from damage, deep cycle batteries should not be run down more than about 20% if you want them to last a long time. |
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| My original board experiment. (not in use) The two boards in the picture above are much nicer. This board and the boards above were cut on my CNC machine. I used a 1/32" ball nose end mill bit set to .005" depth. Just deep enough to remove the copper. On the two finished boards up above, I left quite a bit more copper and just removed the minimum amount between traces. Note that on the two finished boards above, there are 3 capacitors and a 4 lug screw terminal block on the back of the boards. |
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| Here's the Dallas One Wire circuit I am using to monitor several functions on my solar experiment. It reads the voltage on my deep 12 volt deep cycle Batteries. It reads the load current on the batteries. It reads the voltage coming from the PV panel. It reads the charge current coming from the PV panel. The current is being read as a voltage drop across a very precise 50 milliohms (.05 ohms) current sensing resistor. |
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| This is what the current sensing resistors look like. Pretty cool little package |
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| Here's a screen shot of my VB 2008 express custom Solar monitoring program. It monitoring my Solar PV array, the solar storage batteries and several other sensors in my Greenhouse It will also monitor the load being used by 12 volt fans that the program turns on and off to get rid of excess heat. I am still working on the program adding new features all the time. |
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