Relatively simple question about building a generator

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SUMMARY

The discussion centers on building a gas-powered DC generator to charge a 36-volt battery bank, specifically targeting a 500W generator. The user inquires about the minimum engine displacement required for efficient operation, considering the need to charge three 12V, 12Ah batteries, totaling 432Wh. The user initially considers a 10cc engine with 1.6 hp but questions its adequacy, suggesting that a minimum of 25cc displacement may be necessary to achieve the desired output. The importance of factoring in charging time is also highlighted.

PREREQUISITES
  • Understanding of gas engine displacement and horsepower conversion
  • Knowledge of battery specifications, specifically 36V and 12Ah
  • Familiarity with power calculations, including wattage and joules
  • Basic principles of DC generator operation
NEXT STEPS
  • Research gas engine specifications and efficiency ratings for generators
  • Learn about battery charging cycles and time requirements for 36V systems
  • Explore the relationship between engine displacement and power output
  • Investigate alternative generator designs and their fuel efficiency
USEFUL FOR

This discussion is beneficial for hobbyists, engineers, and DIY enthusiasts interested in building gas-powered generators, as well as those looking to optimize battery charging solutions.

freethought202
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Hi, I'm interested in building a gas powered DC generator to charge a small 36 volt battery bank. I think a 500w 36volt generator would do fine, but my question is, what would be a minimum displacement necessary to turn the generator? Basically, the smallest, most efficient, gas engine to charge 3 12v,12Ah batteries. So, I need to charge 432Wh as little fuel as possible. I was looking into it and found that 1 kilowatt converts to about 1.3 horsepower and found an engine with a displacement of 10cc's which had an output of about 1.6 hp. I think my figures must be wrong or there's a factor I'm not considering because this engine is pocket sized I'm not even speaking figuratively. I only need half a kilowatt, but I don't think I can get that out of this engine, It looks to me like I would need more like at least a 25cc, but I want to get an opinion. Thanks in advance.
 
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You have not specified the time you permit to charge the 36V 12AH batteries.
A power of one watt is one joule per second. You must consider the time it must take.
 

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