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 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) for your solar panel system, there are 3 categories of batteries that work best. We will do this in two parts:
Part 1) Quickly compare the three chief types 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 best battery to your own solar panel system!
So let’s begin…
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 one of the longest-used and most dependable batteries in existence. Compared to the other batteries we will discuss in this report; they’re the cheapest option but you trade cost for some battery life and depth of discharge. But for homeowners needing lots of storage for a lower price, or whether you are just making the transfer to a solar panel system, lead acid batteries may be an excellent option. They’re the type of battery we use in most of the battery banks within 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 basically brand new to the market and remain both somewhat untested and harder to come across. Of the three types of batteries, saltwater has the best 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 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 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) Compare the components 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 elements to explore to find the ideal battery for your system.
Cost 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 might not be the best choice always.
For many systems, a battery will cycle every day, meaning it will 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 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 application, 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 harming its life. Certain solar batteries can be depleted further than others, allowing for more use between charging. Basically, a battery with a 90% depth of discharge per cycle will provide more battery power per charge than a battery with less.
Capacity and Power
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 a high capacity and high power can run a large system for many hours; a battery with low capacity and higher 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 store energy. Batteries require power to control and efficacy compares the energy taken to control a battery together 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’s something to focus on. Like other technology, there are both trusted brands and start-up brands. A trusted brand includes known flaws and benefits; a startup brand can perhaps have better technology, but could also have unknown technological issues. Based upon your system needs, you may decide to go with a well-reviewed firm or one that is brand new to the market.