Fish finders are a common accessory that anglers add to their fishing kayaks. As standard, fish finders run off a 12V power supply and on a kayak this will have to be provided in the form of a re-chargeable battery. This blog post shows you how to make a waterproof battery box to keep your power source dry whilst you are on the water....
Batteries for Kayak Electronics
On a kayak this power source will need to be provided in the form of a re-chargeable battery. Most popular are Sealed Lead Acid (SLA) batteries, also known as Valve Regulated Lead Acid (VRLA) batteries. These are relatively inexpensive and readily available from hardware stores or online and come in a range of sizes measured in Amps per Hour (Ah). The higher the Ah, the bigger the battery, the more charge it will hold, and longer run time you will have between recharges. The downside is that the bigger they are the heavier the battery is! Most popular for 3-inch to 5-inch display fish finders is a 7Ah battery and these will usually last a couple of days on the water before they need recharging. Larger screen sizes, touch screen units or side-scan units may require batteries of over 10Ah for a days fishing. A 12V trickle charger is ideal for re-charging these relatively small batteries.
DIY Waterproof Box for Kayaks
Preparing the Power Cable
Assembling the Waterproof Cable Seal on the Box
Assembling the Battery Box
Any questions on this build, feel free to ask below in the comments.