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 better than another? If so, this report 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) to your solar panel system, there are three categories of batteries that work best. We will do this in 2 parts:
Part 1) Instantly compare the three chief types of solar batteries (lead acid, saltwater, and lithium). And,
Part 2) Compare the components of batteries, such as: depth of discharge, power and capacity, efficiency, battery life, and maker.
By the conclusion of this article you will know exactly how to pick out the best battery to your own solar panel system!
So let’s begin…
So the first decision to make is the type of battery that will fit your system.
Lead Acid Batteries
They are 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 lower cost, or if you are simply making the transfer to a solar panel system, lead acid batteries may be an excellent option. They’re the sort of battery we use in the majority of the battery banks in our solar panel systems.
Saltwater batteries are more expensive than lead acid batteries, but also have a better lifespan. Contrary to lead acid batteries, saltwater batteries are essentially brand new to the market and remain both somewhat untested and more difficult to come across. Of the 3 kinds of batteries, saltwater has the best 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. A good example of a lithium ion battery is the Tesla Powerwall.
Part 2) Compare the elements of batteries. As soon as you’ve chosen the best battery type for your solar panel or off-grid system (that meets your system’s needs), there are elements to explore to find the ideal battery to your system.
Cost is probably one of the more obvious components. But the old saying,”you get what you pay for” holds true when purchasing batteries also. In some instances though, certain batteries could be overkill for your system so the most expensive battery might not be the ideal choice always.
Battery Life and Warranty
For most systems, a battery will cycle daily, meaning it is going to charge and drain 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 application, you can extend the life of your batteries.
Length of Discharge
Length of release is how much you can drain the battery down before needing to recharge the battery without harming its life. Particular 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.
Ability and Power
Measured in kilowatt hours (kWh), capacity is the amount of energy a battery can store over time. 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 both a high capacity and high power can run a large system for several hours; a battery with low capacity and high power can operate a large system but just for a brief time.
Efficiency is the amount of energy used compared to the amount of energy it took to save energy. Batteries require power to control and efficacy compares the energy taken to charge a battery with the amount of energy which the charged battery generates.
This might not be a part most would consider, but it’s something to focus on. As with other technology, there are both trusted brands and startup brands. A trusted brand comes with known defects and advantages; a startup brand can perhaps have better technology, but can also have unknown technological issues. Based on your system demands, you may decide to go with a well-reviewed firm or one that is brand new to the market.