 | 清水エスパルス v 横浜F・マリノス S-Pulse v Yokohama F. Marinos Aug 17th 08 http://www.shimizuspulse.com S-Pulse's Iwashita equalises against Yokohama at the Nihondaira Stadium. The game finished 1-1 in a game could have, and should have, won. Apologies for the finger which appears around 13 seconds!! |
 | DIY Autostart Generator walkaround Look at my charging generator. Is controlled by Plasmatronics PL20 solar controller. Drives 2 alternators, one is used just to maintain the starting battery, the other has the voltage regulator removed which allows the output voltage to rise high enough to charge and equalise the large wet batteries I have . The field of this alternator is excited and controlled by a resistor so that the output can be adjusted. Set to output 20 Amps with about 6 ohms resistance. It can be changed to output more current if required by moving onto another tap on the resistor. Uses Holden starter motor (Australian car, engine from late 60's to mid 80's, very common starter motor). I wired the starter motor so that it operated in reverse, by shifting the brushed 90 degrees. The choke is pulled on for a few seconds by a central locking actuator. The tricky part of the design was how to simulate the preloading of the starter clutch. If this was not done the clutch would get destroyed by the torque of the starter motor. It emulates how a person would pull the starter cord. The pretension or preloading is accomplished by apply 12volts via a small resistance. I used nichrome wire as the resistor and as you can see this allows the starter to move slowly to take up the slack. After the slack is taken up the starter engages and rotates the engine. The nichrome resistor is revealed in the video, two lengths of 200mm wire, coiled up to save space. The alternator fields are controlled by relays and are delayed 30 seconds from each other to allow the engine to warm up slightly. There is 3 relays in the white box (Ignition, choke, field 1) and 3 relays external (field 2, start and prestart). The controller uses an atmel 2313 microcontroller. The start and stop is controlled by a single input (via opto isolation). The controller only allows 5 attempts to start. The rpm is measured by a reflective opto sensor on the flywheel. I painted a white spot on the flywheel and count the number of pulses pre second to ensure it is still running. So far it has been reliable. I have heard of others who have had trouble with this method, so far so good. The control of the generator is wholly controlled by the solar charge controller. The controller simply starts the generator when the SOC (State of Charge) is less than 98% and stops when the battery exceeds 15 volts for 10 minutes. The PL20 also exercises the generator every 5 days by running it for 18 minutes (all these parameters are user settable). Any questions please ask. Skip |
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![Don\](images/articles/thumbs/beachrainthumb.jpg "Don\")
