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  • rpait commented on DaytonaPete's instructable Portable Solar Generator10 months ago
    Portable Solar Generator

    DaytonaPete,Nice project. You could even run some modest-sized power tools, especially if you increase the size of your inverter. Good choice, in selecting AGM battery.Pls allow me a tiny correction to some terminology:* you refer to "running wattage...68-77 watts per hour". That should simply be 68-77 watts* "75watts per hour X 8 hours = 600 watts total needed"; this should be:75watts X 8 hours = 600 watt-hours total needed* "12v X 35ah = 420"; shd be:12v X 35ah = 420 watt-hoursThe correct units are helpful, especially when selecting battery size, which is volts and AH.

    You should be able to find what the motor draws in amps. Then choose a "suitable" PV panel that has similar current output. If the PV current and motor current are close, you shd be able to get by without a charge controller. I"m guessing it would be a 100W panel; that may be too large for your trolling boat.

    So...¿where do you go crabbing?

    cangrejero...hola Sr. crabberI'm not sure what you're asking, about re-charge while underway. If you mean using the 12VDC battery to run your trolling motor, and use a solar panel to charge while you go, there should be no problem. The solar panel will simply supply current to the motor and/or battery. If the solar panel provides less current that the motor takes, the battery charge will continue to decline, but at a slower rate. If the solar panel supplies more current than the motor needs, the battery will accumulate more charge. If this latter case describes your setup, you may (but probably not) need a charge controller for the battery.Let me know if I got it right, or give mo more detail. I've had a lot of experience in solar and electronics and will be happy to help.Hasta lue...see more »cangrejero...hola Sr. crabberI'm not sure what you're asking, about re-charge while underway. If you mean using the 12VDC battery to run your trolling motor, and use a solar panel to charge while you go, there should be no problem. The solar panel will simply supply current to the motor and/or battery. If the solar panel provides less current that the motor takes, the battery charge will continue to decline, but at a slower rate. If the solar panel supplies more current than the motor needs, the battery will accumulate more charge. If this latter case describes your setup, you may (but probably not) need a charge controller for the battery.Let me know if I got it right, or give mo more detail. I've had a lot of experience in solar and electronics and will be happy to help.Hasta luego,Ron

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