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 better than another? If so, this article 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) to your solar panel system, there are three categories of batteries which work best. We’ll do this in two parts:
Part 1) Instantly compare the three main types of solar batteries (lead acid, saltwater, and lithium). And,
Part 2) Compare the elements of batteries, such as: depth of discharge, power and capacity, efficiency, battery life, and maker.
By the end of the article you will know exactly how to pick out the best battery for your solar panel system!
So let’s begin…
Part 1) The Three Best Types Of Batteries For Solar Panel Systems: The best type of battery for your solar panel system will depend on what you’re looking for. 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 sort of battery that will fit your system.
Lead acid batteries are the most commonly used rechargeable battery in the world. They are also among the longest-used and most reliable batteries in existence. Compared to the other batteries we will discuss in this report; they are the cheapest option but you trade price for some battery life and depth of discharge. But for homeowners needing lots of storage for a lower cost, or whether you are just making the transfer to a solar panel system, lead acid batteries may be a very good 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 better lifespan. Unlike lead acid batteries, saltwater batteries are essentially brand new to the industry and remain both somewhat untested and more difficult to come across. Of the 3 types of batteries, saltwater has the greatest depth of discharge, so you’ll get the most output per charge before needing to recharge.
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. A good example of a lithium battery is the Tesla Powerwall.
Part 2) Assess the components 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 components to research to find the ideal battery to your system.
Price is probably one of the more obvious elements. But the old saying,”you get what you pay for” holds true when buying batteries also. Sometimes though, certain batteries could be overkill for your system so the most expensive battery may not be the ideal choice always.
Battery Life and Warranty
For many systems, a battery will cycle every day, meaning it is going to charge and drain regularly. With every cycle, the battery’s ability to hold the same charge lessens slightly. So 1 component to consider is the warranty on the battery that guarantees a specific number of cycles of useful life. But bear in mind that if you use the maintenance and reconditioning methods we teach you at the EZ Battery Reconditioning program, you can extend the life of your batteries.
Length of Discharge
Depth of discharge is how much you can drain the battery before needing to recharge the battery without damaging 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 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 certain moment. A battery with a high capacity and high power can run a large system for several hours; a battery with low capacity and high power can run a large system but only for a brief time.
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 charge a battery with the amount of energy which the charged battery generates. The higher the efficiency, the more cost-effective the battery.
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 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 for a well-reviewed firm or one that is brand new to the market.