Note 8 Root 80 Battery Fix

How To Pick Out The Best Battery For a Solar Panel System, Battery Bank, or Off-Grid System

Or have you wondered what makes one deep cycle battery greater than another?  If so, this article will answer these questions and give you specific things to check on before buying your new battery (to make certain you get the most bang for the buck)!

When choosing a battery (or batteries) for your solar panel system, there are 3 categories of batteries which work best.    We will do this in two parts:

Part 1)   Quickly compare the three main types of solar batteries (lead acid, saltwater, and lithium).   And,

Part 2)   Assess the elements of batteries, such as: depth of discharge, capacity and power, efficiency, battery life, and manufacturer.

By the end of the article you will know just how to pick out the ideal battery to your solar panel system!

So let’s get started…

There are three battery types that work exceptionally well; however, each battery type has pros and cons. So the first decision to make is the type of battery that will fit your system.

They’re also among the longest-used and most dependable batteries in existence.  When compared with the other batteries we will discuss in this report; they are the cheapest option but you trade cost for some battery life and depth of discharge.  But for homeowners needing a great deal of storage for a lesser price, or if you are just making the move to a solar panel system, lead acid batteries might be an excellent option.  They’re the type of battery we use in most of the battery banks in our solar panel systems.

Saltwater batteries are more expensive than lead acid batteries, but also have a greater lifespan.  Unlike lead acid batteries, saltwater batteries are essentially brand new to the industry and stay both somewhat untested and more difficult to come across.  Of the three kinds of batteries, saltwater has the greatest depth of discharge, which means you’ll find the most output per fee before needing to recharge.

Lithium batteries are the most expensive and the longest lasting of the three kinds of solar batteries.  Their depth of discharge is less than that of a saltwater battery, but more than that of a lead acid battery. Comparing all three options, the lithium ion battery is probably the highest rated, but also the most expensive.  An example of a lithium battery is the Tesla Powerwall.

Part 2) Compare the elements of batteries.  As soon as you’ve picked the best battery type for your own solar panel or off-grid system (that meets your system’s needs), there are elements to research to find the ideal battery to your system.  

Cost

Price is probably one of the more obvious components.  But the old saying,”you get what you pay for” holds true when purchasing batteries as well.  In some instances though, certain batteries could be overkill for your system so the most expensive battery might not be the best choice always.

For many systems, a battery will cycle daily, meaning it is going to drain and charge regularly.  With each cycle, the battery’s ability to maintain the same charge lessens slightly.  So one component to consider is the guarantee on the battery that guarantees a certain number of cycles of useful life.  But keep in mind that when you use the maintenance and reconditioning methods we teach you at the EZ Battery Reconditioning program, you can extend the life of your batteries.

Depth of Discharge

Length of release is how much you can drain the battery before needing to recharge the battery without damaging its life.  Certain solar batteries may be depleted farther than others, allowing for more use between charging.  Essentially, a battery with a 90% depth of discharge per cycle provides more battery power per charge compared to a battery with less.

Capacity and Power

The more capacity a battery has, the more power it can store.   Power is how much energy a battery can provide at a given moment.  A battery with a high capacity and high power can run a massive system for several hours; a battery with low capacity and high power can operate a large system but just for a brief time.

Efficiency

Efficiency is the amount of energy used compared to the quantity of energy it took to save energy.  Batteries require power to charge and efficiency compares the energy taken to charge a battery together with the amount of energy which the charged battery generates. 

Manufacturer

This may not be a part most would consider, but it’s something to focus on.  As with other technologies, there are both trusted brands and start-up brands.  A trusted brand comes with known defects and advantages; a start-up brand can perhaps have better technology, but can also have yet unknown technological difficulties.  Based on your system needs, you might decide to go for a well-reviewed firm or one that is brand new to the market.