Fix Milwaukee M12 Battery

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

Have you ever wondered how to pick out the best battery(s) for your solar panel system (or off-grid energy system)? Or have you wondered what makes one deep cycle battery greater than another?  If so, this report will answer these questions and give you specific things to check on before purchasing your new battery (to ensure you get the most bang for your buck)!

When choosing a battery (or batteries) for your solar panel system, there are 3 categories of batteries that work best.    We will do this in 2 parts:

Part 1)   Instantly compare the three chief kinds of solar batteries (lead acid, saltwater, and lithium).   And,

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

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

So let’s begin…

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 are also among the longest-used and most reliable batteries in existence.  When compared with the other batteries we will discuss in this report; they are the cheapest option but you exchange price for some battery life and depth of discharge.  But for homeowners needing a great deal of storage for a lesser price, or whether you are simply making the transfer to a solar panel system, lead acid batteries may be a very good option.  They’re the sort of battery we use in most of the battery banks within our solar panel systems.

Saltwater Batteries

Saltwater batteries are more expensive than lead acid batteries, but also have a greater lifespan.  Contrary to lead acid batteries, saltwater batteries are basically brand new to the market and stay both somewhat untested and harder to come across.  Of the 3 kinds of batteries, saltwater has the greatest depth of discharge, so you’ll find the most output per fee before needing to recharge.

Lithium Batteries

Lithium batteries are the most expensive and the longest lasting of the three kinds of solar batteries.  Comparing all three options, the lithium 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.  Once you’ve chosen the best battery type for your solar panel or off-grid system (that meets your system’s needs), there are components to research to find the ideal battery for your system.  

Cost

Price is probably one of the more obvious elements.  But the old saying,”you get what you pay for” holds true when buying batteries as well.  In some instances though, certain batteries may be overkill for your system so the most expensive battery might not be the ideal 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 identical charge lessens slightly.  So 1 component to consider is the guarantee on the battery that guarantees a specific number of cycles of useful life.  But bear in mind that when you use the maintenance and reconditioning methods we teach you at the EZ Battery Reconditioning application, 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 harming its life.  Certain solar batteries can be depleted farther than others, allowing for more use between charging.  Essentially, a battery with a 90% depth of discharge per cycle will provide 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 certain moment.  A battery with a high capacity and higher power can run a large system for several hours; a battery with low capacity and higher power can operate a large system but just for a brief time.

Efficiency

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

Manufacturer

This might not be a part most would consider, but it is something to pay attention to.  As with other technology, there are both trusted brands and startup brands.  A trusted brand includes known flaws and advantages; a startup brand can perhaps have better technology, but can also have unknown technological difficulties.  Based upon your system needs, you may decide to go with a well-reviewed firm or one that is brand new to the market.