Best Deep Cycle Battery for Solar Reviews 2019

Getting the best solar battery is a must for building a solar power system. These batteries are a good source of power storage and run everything in your house. Sometimes you need more electricity than your solar panels produce. You can use the solar energy stored in the battery in this case. Using solar batteries has benefits. However, they are expensive and are difficult to change after your solar storage system is built. Below are our picks of the best solar batteries available on the market today.

5 Best Deep Cycle Battery for Solar

VMAX SLR125 AGM Deep Cycle Battery

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Trojan L16RE-2V Deep Cycle Battery

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Renogy Deep Cycle Pure Gel Battery 12V 200Ah

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Universal UB121000-45978 Deep Cycle Battery

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Battle Born 100 Ah LiFePO4 Deep Cycle Battery

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VMAXTANKS SLR125 AGM Deep Cycle Battery is a great choice for your off-grid solar energy system. This heavy-duty deep cycle AGM battery is one of the most popular ones on the market. In addition, it provides you with great amp ratings and satisfaction at half the cost. Moreover, it works well in the winter and is invariably charged, regardless of whether the temperature is below freezing.

High-quality alloys and quality material are used to produce this battery. Additionally, the design enables it to stand extreme conditions. There is Absorbed Glass Matt found in the electrolyte suspension system. It helps with totally absorbing and containing the electrolyte. Moreover, Silica Gel or some other substances aren’t used. In addition, you do not even need to include water to it.

The Self-discharge rate of the battery is 1-2% of rated capacity every month at room temperature. Moreover, the power density of the battery is enhanced with a significant level a result of the special assembly technology. Though a slightly more expensive, it’s worth the money. Furthermore, this battery is excellent for a day’s activity. You can operate multiple electrical appliances with losing power suddenly.

It is one of the best deep cycle batteries on the market for the solar system. It offers a life of up to 10 years and requires no maintenance. One downside, it requires the original charger otherwise it will lose its efficiency, life, and quality.

Things we liked

  • Long Battery Life
  • No Maintenance
  • Excellent Quality


Things we didn’t like

  • Requires Original Charger


The Trojan L16RE-2V Deep Cycle Battery is another great solar battery available on the market. it is the most useful option for running large appliances, like refrigerators or air conditioning. This battery passes rigorous quality tests. The terminals cost nothing of corrosion and also the reservoir is very large.

Though it needs frequent maintenance, it is incredibly easy to do. This battery meant to have at least 10-years of life-cycle and carries an 18-month warranty. This battery can be employed in extreme condition including high or low temperatures. In addition, this 2V battery affords storage of 1110Ah. Moreover, if you need a supply of 48V, buy 24 of these 2-volt deep cycle batteries.

Things we liked

  • Heavy Duty
  • Excellent Life Time
  • Easy To Maintain


Things we didn’t like

  • None That We Could Find


This battery comes with robust grid-irons, high cleanliness lead, and an original Gel electrolyte. It bids outstanding recovery after deep discharge under recurrent cyclic discharge usage. These batteries have large life and can deliver power for several years without weakening. It has a blatant calculated design and Triple closed structure. It’s spill-proof with very Low discharge. Even if left charged, includes a really low discharge rate and that is not even noteworthy. This gel-based deep cycle solar battery is efficient. Though not long lasting, it offers low discharge. Its triple-sealed design makes it highly secure.

Things we liked

  • Long Lasting
  • Very Low Discharge
  • Comes with original Gel electrolyte
  • Large life


Things we didn’t like

  • None That We Could Find


The Universal UB121000 12v 100AH is competitively priced. It comes with sealed AGM and gel technology. It is a decent battery and can handle a wide range of temperatures. You can mount it in any position. It doesn’t require maintenance. You can use a solar regulator to draw 50% of its capacity in order to extend the lifespan. You can transport this battery by air or ground without any special handling regulations. These batteries are great for the price.

Things we liked

  • Competitively priced
  • Sealed AGM and gel technology
  • Maintenance free


Things we didn’t like

  • The short 12-month warranty is not attractive
  • Some customers reported that sometimes batteries come with defects


LiFePO4 lithium-ion battery is the safest, strongest and most reliable solar deep cycle battery on the market. This battery is 100% made in the USA. This powerful battery weighs only 29 lbs. The materials used are 100% safe and nontoxic. This battery can stand extreme temperatures and have very long life span.

It can be recharged very fast even in cloudy weather. The excellent warranty allows you to get a full replacement if the battery fails within the first three years. These batteries are incredible and last 3000 or more cycles. It’s quite impressive how powerful this battery is. If you are thinking about an off-grid or grid tie with battery backup application these batteries are worth it.

Things we liked

  • Safe and reliable
  • Weighs only 29 lbs
  • Contains safe and non-toxic materials
  • Long life span
  • Excellent warranty with full replacement


Things we didn’t like

  • May seem a bit over priced


Buying Guide: Best Deep Cycle Battery for Solar


As you have finished reading about the best products available on the market, here’s a list of criteria you need to compare different types of solar batteries. The most important things to consider during your evaluation are the battery’s capacity and power ratings, depth of discharge, round-trip efficiency, warranty, and manufacturer.


Power & Capacity

Check the total amount of electricity the solar battery can store. The capacity is measured in kilowatt-hours (kWh). To know how much electricity a battery can provide at a given moment consider its power rating. A power rating is the amount of electricity a battery can deliver at a time which is measured in kilowatts (kW).

A high capacity battery with a low power rating delivers a low amount of electricity enough to run important home appliances for a long time. On the other hand, a low-capacity battery with a high power rating would run your entire home only for a few hours. Most home solar batteries are “stackable.” So you can include multiple batteries with your solar-plus-storage system to increase the capacity.


The depth of discharge

The depth of discharge (DoD) of a battery refers to the amount of its capacity that has been used. Look for a battery with a maximum DoD for optimal performance. In general, the higher the DoD is, the more you will be able to utilize your battery’s capacity.


Round-trip efficiency

The round-trip efficiency is a percentage of the amount of energy that the battery took to store electricity into it. Let’s say, you fed your battery five kWh of electricity and got four kWh of electricity stored in it. So the battery has 80 percent round-trip efficiency. So choose a battery with higher round-trip efficiency. It will give you more economic value out of your battery.


Battery life & warranty

A solar battery cycles every day. That means it charges and drains every day. Its ability to hold charge decreases over time as you continue using it. So check the number of cycles the battery remains useful. Also, check how much capacity it loses over time. Let’s say, a battery has a warranty of 5,000 cycles or 10 years at 70 percent of its original capacity. Now after the warranty period is over, the battery will lose 30 percent of its ability to store energy.



You will find start-up manufacturer as well as a manufacturer with a long history. In this case, your choice depends on your priority. However, the warranties can provide additional guidance to make your final decision.


Final Thought

Congratulations! You have finished reading our review and buying guide. We believe that now you know everything to be able to buy a deep cycle battery for solar. We remind you to consider the power, capacity, depth of discharge, round-trip efficiency, battery life and warranty.

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