Life span of Home Energy Storage System

solar battery storage

Home batteries complement a solar system. A solar battery backup will power one’s home during blackouts and grid outages. Climate change and ageing infrastructure pose a constant threat to blackouts and power outages.

More and more people are turning to batteries now. It is a significant long-term investment as a solar-plus-battery system enables one to be independent of the local utility.

Various types of home solar batteries are:

Lead-acid Batteries: Lead-acid batteries are a tested technology that has been used in off-grid energy systems for decades. They have a relatively short life and lower depth of discharge (DoD) compared to the other battery types. It is the least expensive option currently on the market in the home energy storage sector. For homeowners who want to go off the grid and need to install lots of energy storage, lead-acid batteries can be a good option.

Lithium-Ion Batteries: Lithium-ion batteries are the gold standard of home energy storage systems because they are lighter, more compact, and have a longer lifespan and higher DoD than lead-acid batteries. Lithium-ion batteries are more expensive than   other types of batteries. Because of higher demand, the cost of lithium-ion batteries has decreased by 85%, making solar power backed by solar storage more accessible.

Saltwater Batteries: Unlike lead-acid and lithium-ion batteries, saltwater batteries don’t contain heavy metals, it relies on saltwater electrolytes.  It can be easily recycled, unlike lead acidic and lithium-ion batteries which use heavy metals. This makes saltwater batteries more environmentally friendly. As a new technology, saltwater batteries are relatively untested.

Among the three, lithium-ion batteries are the best option for a solar panel system, though other battery types can be more affordable. Lithium-ion batteries offer the most reliable source of power thereby maximizing solar energy potential. Initially, it was very expensive, but now the price has come down by 85%, making it more affordable.


1. Battery Usage

The life expectancy of a solar battery is mostly determined by its usage cycles. For most uses of home energy storage, the battery will “cycle” (charge and drain) daily. The more we use, the battery’s ability to hold a charge will gradually decrease. A solar battery will have a warranty that guarantees a certain number of cycles and/or years of useful life. For example, a battery might be warrantied for 5,000 cycles or 10 years at 70 percent of its original capacity. This means that at the end of the warranty, the battery will have lost no more than 30 percent of its original ability to store energy.  The life of a battery depends on its brand and the capacity it will lose over time. Most solar batteries are generally deep-cycle batteries, which allows them to discharge up to 80% of their stored energy before recharging.

2.  Solar Battery Temperature

Solar batteries are affected by temperature. Protecting the battery from freezing or sweltering temperatures can increase its useful life. The place you live and where the battery is installed makes a huge difference. The battery unit should be kept at an optimal temperature to maximize its life and efficiency.

In areas with temperate/mild temperatures, batteries could be installed outdoors. Whereas, in regions with harsh temperatures, the battery will perform optimally only if it’s installed in the garage or basement.

When a PV battery drops below 30° F, it will require more voltage to reach maximum charge; when that same battery rises above the 90° F threshold, it will become overheated and require a reduction in charge. To solve this problem, many leading battery manufacturers, like Tesla, provide temperature moderation as a feature.

3. Solar Battery Maintenance

Proper maintenance can have a significant effect on your solar battery’s lifespan. Maintaining your solar system costs $150-$300 annually, while repairs could cost anywhere between $100-$3,200. Proper maintenance can help you get the biggest bang for your battery buck.

A monthly inspection of solar batteries with an eye toward any potential problems would be ideal. One has to check for leakage and corrosion on or near the terminals and cables, feel around for hot spots. If you notice any issues with any of your batteries, deal with them promptly to prevent additional damage to your storage bank. Quality maintenance efforts can definitely impact how long your solar battery will last.

4. Solar Battery Warranty

Solar battery manufacturers offer a wide range of warranties for their battery products. Usually, lead-acid batteries are found to have a low warranty period whereas lithium-ion batteries are covered for 10 years or more.

When it comes to batteries, there is usually one warranty that covers both product and performance elements. Manufacturers guarantee that the product will remain free of defects and retain a specified level of performance for a number of years or a number of battery cycles, whichever comes first.

The general range for a solar battery’s useful lifespan is between 5 and 15 years.  Batteries will have to replaced at least once to match the 25year lifespan of PV system.

Having realized that battery is the future, Regen Power has made exclusive deals with industry-leading battery suppliers. This enables us to provide premium batteries at an affordable price for our customers. Our solar technician can help you determine the best placement for your solar battery. We promise live monitoring of solar panels and battery 24/7.

Regen is now a Tesla certified installer, which means we offer a customized solar-plus-battery solution that enables one to harness the abundant power of sun with zero dependence on fossil fuels. Installing Powerwall with Regen is easy. We take care of everything from system design, permitting, installation, financing, and customer service.