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Thread: power generation

  1. #16
    Like an engineer alternety's Avatar
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    I think people that have any moderate sized system (wind, solar, probably not hydro) use non-sealed batteries. You can get some real monsters. You can get automatic rewatering caps.

    The care and feeding of batteries is non-trivial. Modern electronics takes care of some of it. The larger percentage of full charge you remove the shorter the overall lifetime of the batteries. So you need a lot more capacity than you think. You can find numbers for this on the web. I am not positive but I think 50% discharge is a common limit.

    Charging must be done carefully. Every so often the bank of batteries will need an "equalization" charge. They are charged to bubbling to bring all the cells to close to the same state. Each cell in a battery will have some variance from the others.

    If you are serious about it you really need batteries designed for this service. For small systems lots of people use things like golf cart, marine, or fork lift batteries. Lead-acid is by far the most used type.

  2. #17
    DIY Senior Member BrianJohn's Avatar
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    Batteries are designed and sized first on the type of discharge, for example short duration high current such as engine starting batteries or for power distribution longer duration low current such as you might use in a solar application. When purchasing batteries you determine you load (or expected load) and duration of support time you require. You need not concern yourself with. The manufactured data is based upon your expected shut down voltage, the lower the voltage you discharge a battery to the more capacity but this shortens life. For long duration discharges the typical shut off voltage of the system is 1.75 Volts per cell.

    If you are serious about this get the PRPOER BATTERY for the application, the plates in a battery are designed for the particular application.

    As for sealed versus flooded, the industry is moving away from flooded cells in smaller applications as there is less maintenance and handling of the open jars and off gassing is not as big an issue.

  3. #18
    DIY Junior Member marchse's Avatar
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    you can't say for sure bcoz there are many cities where you can't biuld wind power.


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