Have you ever wondered how to pick out the best battery(s) to 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 article will answer these questions and provide you specific things to check on before purchasing your new battery (to ensure 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’ll do this in two parts:
Part 1) Quickly compare the three chief kinds 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 the article you will know exactly how to pick out the best battery for your own solar panel system!
So let’s get started…
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. So the first decision to make is the type 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. 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 lower cost, or whether you are just making the move to a solar panel system, lead acid batteries might 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 greater lifespan. Contrary to lead acid batteries, saltwater batteries are basically brand new to the market and stay both somewhat untested and more difficult to come across. Of the 3 kinds of batteries, saltwater has the greatest depth of discharge, so you’ll get the most output per fee before needing to recharge.
Lithium batteries are the most expensive and the longest lasting of the three types 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 choices, 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) Assess the elements of batteries. As soon as you’ve chosen the best battery type for your own solar panel or off-grid system (that meets your system’s needs), there are components to explore to find the ideal battery for 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 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.
Battery Life and Warranty
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 one component to consider is the guarantee on the battery which guarantees a certain number of cycles of useful life. But keep 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.
Depth 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
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 that a battery can provide at a given moment. A battery with both a high capacity and higher 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 efficiency compares the energy taken to charge a battery with the amount of energy which the charged battery produces. The higher the efficiency, the more cost-effective the battery.
This might not be a part most would consider, but it’s something to pay attention to. Like other technologies, 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 yet unknown technological issues. Based on your system needs, you may decide to go with a well-reviewed company or one that is brand new to the market.