Solar Boat Charging help?
Hi, i have a 17 foot runabout/ski boat from the 80s. its a very simple setup but id like to have a stereo, automatic bilge pump and a cigarette adapter for my phone charger. i could just wire this up, but i know if i leave the stereo on for long enough the battery will die. can i get a small solar panel about the size of one of the windows to charge a battery and keep the stereo going? thanks–seth
You need to fit a second battery and automatic switching system, to stop your starting battery from running down.
Solar panels are good. They are not rated on their physical size, although this is relevant to the output. You will be surprised at the area needed just to provide enough current to justify a charge controller, on a 17 footer you will find this pretty awkward, although a solid Targa or Bimini top can be a good place to fit panels if you can support it well. At best a panel mounted on the cabin top with zero shade can only approach full rated output for around four hours a day should the sun be directly facing the panel. In practice a solar panel is superb on a boat for keeping batteries topped up while parked, but not much use at providing serious current to run a stereo – a panel the size you seem to be suggesting might be around 10 – 20 watts. That size panel would peak at around 400 – 800 mA into a 12 V load. That is perfect for maintaining the batteries, but no good to run anything off itself. It all helps though.
solar bilge pump
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