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A friend has a boat with minimal power demand -- probably less than 3.3 amps (running lights and a Raymarine 435 chartplotter) for no more than two hours. If he had a 15AH battery, this load would only draw the battery down 40%. He keeps his boat on a mooring and schleps the battery ashore to recharge so lighter is better. Any ideas on what to use? Wheel chair battery?
 

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Motorcycle not wheel chair. They are even lighter. Down around 12-15lbs for that size. But he would probably do better to buy a cheap solar panel to recharge the battery in place. They are available from WM for about $40.
 

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A friend has a boat with minimal power demand -- probably less than 3.3 amps (running lights and a Raymarine 435 chartplotter) for no more than two hours. If he had a 15AH battery, this load would only draw the battery down 40%. He keeps his boat on a mooring and schleps the battery ashore to recharge so lighter is better. Any ideas on what to use? Wheel chair battery?
I used to schlep, too, with our Catalina 22. 1983 to 1987.

These days, get a solar panel and controller. Question answered.
 

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A solar panel is definitely the way to go. A 10-20 watt panel plus a controller can be found for $100 or so today.
 

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The size of solar panel would depend on the needed charging time and with solar on the boat he could use a considerably larger battery and keep the discharge well above the recommended minimum of half
 
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