uncleflo
Registered since September 28th, 2017
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Boat Lightning Attenuation Onboard
Saved by uncleflo on May 11th, 2021.
According to published reports, in the US out of the annual average of about 100 deaths due to lightning, approximately 13 are aboard boats. Suffice it to say that if lightning is a hazard where your boat will be used, a plan should be developed to deal with the possibility of a direct strike. In the Pacific Northwest lightning is relatively rare. In Florida, some areas annually have more than fifty strikes per square mile..! According to the well known lightning researcher Ewen Thompson, lightning can develop on the order of one hundred million volts, peak currents of tens of thousands of amps, and generate temperatures of some fifty five thousand degrees. Fortunately, it lasts only a fraction of a second, but within that time it can be deadly and / or very destructive. A lightning strike involves an extremely rapid change in an electric current, generating a momentary but extremely powerful magnetic field. This electro-magnetic pulse (EMP) will readily induce currents in adjacent wiring. Currents induced in wires by the EMP from a lightning strike may do some very weird things, such as fry every piece of electronics aboard. A strike nearby or on another boat can fry the electronics aboard your boat without even requiring an electrical connection or direct strike.
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DIY 24v LiFePO4 Solar Battery Bank! Beginner Friendly, 2.4 kWh, Cheap, Full Tutorial! - YouTube
Saved by uncleflo on June 23rd, 2019.
Safety Update: If the cells have a voltage difference of more than .2 of a volt (example: one cell is 2.7 volts, and another cell is 3.5 volts), you should not parallel connect, and instead discharge the higher voltage cell with a 25-50 watt, 1.5-2.7 ohm resistor. Just attach the leads of the resistor to the individual higher voltage cell, and wait till it is at a voltage that is closer to the other cells. When they are within .2 volts of each other, then you can connect them in parallel and allow them to equalize. Another way to do this is to charge the lower voltage cells, but 3 volt chargers are not easy to find, so I would stick to the resistor method. These resistors only cost a dollars each, and you can find them at most electronics supply stores.
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