![]() ![]() ![]() This means you may need up to three batteries in series to meet the voltage requirements for your trolling batteries. For example, trolling motors can require 12, 24, or 36 volts. It is important to always match the voltage of your system to the voltage of your battery bank. Once you have the total amp hours required, you need to check your system’s requirements for voltage. If you were to have any additional accessories needing battery power, like house lights or a stereo, you would also need to take those amperage needs into account of how large to size your house power battery bank.Įstimated run time (hours) x estimated amperage needed = total amp-hours required Depending on the trolling motor’s requirement, you will also need 24V to 36V, meaning you would need two to three 12V batteries in series to meet the requirement. Often times, fishermen will use a separate battery bank for their trolling motor than they will for the rest of the house power items.įor example, let’s say the boat has a trolling motor that will use 25 amperes and will be in use for 4 hours, you would need a 100Ah (amp-hour) battery to power the trolling motor for that long. Items that might be pulling power on your boat include: trolling motor and house power items like lights, radio/stereo, pumps, and fish finders, among others. How to Size a Deep Cycle Battery for your Boatīefore picking a battery for your boat, you’ll need to understand its power requirements, how long and how often you are using it, and how big the battery cabinet is. The most common amp-hours (AH) fall between 70AH and 125AH but depending on the size of the boat and power draw, may be as low as 20AH. The batteries, regardless of size, are offered in a 12-volt (V) platform, usually connected in series to bring the total voltage up to 36V (3 in series) or 48V (4 in series). However, with lithium, because of the higher energy density of the cells, overall construction of the battery, and smaller footprint, we can manufacture group sizes in different amp-hour (AH) ranges. This is because the bigger case allows more room for electrolyte and lead plates, which translates into higher capacity. When looking at traditional sealed lead acid batteries, it is usually safe to assume that the larger the case size, the more capacity. Marine batteries typically come in a range of BCI ( Battery Council International) group sizes – and these group sizes equate to the physical size of the battery. ![]() In this blog, we will be covering marine deep cycle batteries. To optimize your battery’s life and performance, it is often common to have a separate deep cycle battery bank in addition to your starter battery. Deep cycle batteries can be further split into two groups – house batteries, which are used to power anything from the radio to the fish finder to house lights, and trolling batteries, which are used to power your trolling motor. Starter batteries are designed to – you guessed it – start the boat’s engine. Marine batteries can be broken up into two groups – starting batteries and deep cycle batteries. Now that you have a basic understanding of deep cycle batteries, let’s dive into deep cycle lithium marine batteries. In a lithium iron phosphate (lithium, for the purpose of this blog) battery, energy cells are used for deep cycling purposes. In an SLA battery, a deep discharge can be seen at the 10- or 20-hour rates. Deep cycle batteries, are designed to have their entire capacity removed from the battery very slowly over time. ![]()
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