The 10 Best Deep Cycle Solar Batteries

video play icon

This wiki has been updated 20 times since it was first published in November of 2018. Modern battery technology is one of the most important advances of our era, especially for anyone with residential and mobile solar setups. Of the several varieties available, the absorbent glass mat and lithium iron phosphate types have emerged as the safest, most efficient, and most consistent. Here are some of the best secondary deep-cycle models, with options in a wide range of prices. When users buy our independently chosen editorial selections, we may earn commissions to help fund the Wiki.

1. Universal UB121000

2. Renogy LFP

3. ExpertPower EP12100

Editor's Notes

October 22, 2020:

True to our word from our last update, we continue to avoid flooded and gel-type batteries and stick to the safer, more efficient LiFePO4 and sealed lead acid options. This includes the newly added ExpertPower EP12100, a force to be reckoned with that features a built-in management system that safeguards it against problems like overcharging, overheating, deep discharging, overloading, and short circuits. It stands up well to temperatures as high as 140 degrees Fahrenheit, and is compact and lightweight enough for convenient storage and transport, making it a good choice for marine and RV applications. It replaces the Orient Power Cordy, a four-cell model that’s no longer available at this time.

We also replaced the discontinued Goal Zero Yeti 400 with the more powerful Goal Zero Yeti 500X, a power station that can power up to seven small devices at a time, like phones, tablets, laptops, and cameras. It’s got a built-in pure sine wave inverter and recharges from either AC or a solar panel, sold separately. This portable choice features a sturdy carrying handle and a comprehensive LCD that shows you how much power you have left with just a quick glance. It also offers an input/output meter and a runtime/recharge time calculator. Our list also includes a couple of options from well-known solar company Renogy. The reliable Renogy LFP boasts a rated service life of more than double that of traditional lead acid batteries. It’s also equipped with high and low voltage protection, as well as protection from over-current, high temperatures, and short circuits. Its low rate of self-discharge is no more than three percent per month. The Renogy AGM is a sealed lead acid model that contains fiberglass mats that soak up the sulfuric acid inside of it, while remaining leak-free. It operates at safe, low temperatures and can last for up to 600 cycles. For safety’s sake, be sure to charge any given battery at a safe voltage level, based on the manufacturer’s recommended limit. In addition, store batteries within the stated temperature range, as elevated temperatures can reduce a battery’s lifespan and cause problems like thermal runaway.

December 06, 2018:

First of all, flooded and gel-type lead-acid batteries are simply not recommended for modern solar energy systems. They're inefficient, expensive to produce, and potentially dangerous. So, until Elon Musk figures out something new, it's LiFePO4 vs. lead-acid, each of which have advantages and disadvantages. If you don't want to make a huge investment, the Universal is a perfect choice. Those in search of more capacity and better regulation should look at the Orient Power, but keep in mind that LiFePO4 batteries lack the nearly fool-proof safety of the AGM variety. The Renogy LFP offers about the most usable energy storage you'll find, though at a high premium. And the Battle Born is a seriously solid device; it's probably the longest-lasting of all.

Special Honors

KiloVault 1800 HLX 1800 WH This high-tech lithium battery works more efficiently than traditional deep cycle ones, with no maintenance required on your part. This versatile choice is compatible with 12-, 24-, or 48-volt configurations, and features a lower cost per watt-hour and a longer lifespan than lead batteries. Unlike many others, 80% of the battery remains after it’s discharged completely 2,000 times. It’s backed by a 7-1/2-year warranty, so you can purchase it with confidence.

4. Battle Born 10012

5. VMaxTanks SLR

6. Renogy AGM

7. Mighty Max ML4D

8. Cordy 200Ah

9. Goal Zero Yeti 500X

10. Mighty Max ML35

Karen Bennett
Last updated by Karen Bennett

Karen Bennett lives in Chicago with her family, and when she’s not writing, she can usually be found practicing yoga or cheering on her kids at soccer games. She holds a master’s degree in journalism and a bachelor’s in English, and her writing has been published in various local newspapers, as well as “The Cheat Sheet,” “Illinois Legal Times,” and “USA Today.” She has also written search engine news page headlines and worked as a product manager for a digital marketing company. Her expertise is in literature, nonfiction, textbooks, home products, kids' games and toys, hardware, teaching accessories, and art materials.

Thanks for reading the fine print. About the Wiki: We don't accept sponsorships, free goods, samples, promotional products, or other benefits from any of the product brands featured on this page, except in cases where those brands are manufactured by the retailer to which we are linking. For more information on our rankings, please read about us, linked below. The Wiki is a participant in associate programs from Amazon, Walmart, Ebay, Target, and others, and may earn advertising fees when you use our links to these websites. These fees will not increase your purchase price, which will be the same as any direct visitor to the merchant’s website. If you believe that your product should be included in this review, you may contact us, but we cannot guarantee a response, even if you send us flowers.