Storage batteries for solar panels are the best way to get power at any time.
Indeed, solar energy is intermittent and the power output of your solar panels varies depending on several factors:
- Time of the day/year
- Weather conditions
- Outside temperature
Although solar energy is now the cheapest source of electricity in most parts of the world, this is only true when the sun is shining.
If your solar panels are connected to the utility grid, then you won’t need to add batteries to your system. Indeed, the grid can still power your house at any time.
However, if you are looking to use your solar energy production you need to store the excess of electricity produced during the day.
- Cost advantage
A description of the key factors needed to choose the best storage batteries for solar panels will be provided, followed by a review of the 7 best storage batteries.
For a quick overview, check out our editor’s choice.
Editor’s Choice – Best Storage Batteries For Solar Panels
How To Select The Best Storage Batteries For Solar Panels
Back in the day, one would use a car battery to store solar energy, however, those batteries were not designed for this purpose and would perform badly, dying after 2 or 3 years.
Thanks to the development of Lithium batteries and more specifically LiFePo4 batteries, we now have access to efficient and specially designed solar batteries. Now we will look at 6 of the most important specifications to focus on for the best storage batteries:
Tolerant To Intermittent Charging/Discharging
Solar panels are non-linear generators, their power output varies continuously depending on sunlight irradiation. A passing cloud can generate drastic power variation (several hundreds of watts). Therefore, your battery should be ready for such events. Luckily, LiFePo4 batteries can handle power fluctuations pretty well.
The durability of a battery is rated in the number of cycles (charge/discharge) and in years. The most recent lithium batteries offer up to 5,000 cycles and 10 years of durability.
The battery should deliver enough Amps to power your appliances. Solar lithium batteries typically deliver from 50Amps (600W) to 200Amps(2400W) continuously, with peak power up to 300Amps(3600W).
Lithium batteries for solar panels have high storage capacities, they can store up to 300Ah (3600Wh) and 100% is usable. Their capacity varies depending on the price of the battery.
Quick Charging Abilities
As they deliver a high power output, they also accept a large quantity of energy for quick charging with solar panels. It ranges from 50Amps to more than 100Amps. It only takes 3 to 4 hours to fully charge a solar battery.
In a recent article, we described how the LCOS (levelized cost of storage) is the best way to estimate and compare the cost of solar batteries. Indeed, the buying price is an important parameter but it has to be balanced by the certified total life duration of your battery.
7 Best Storage Batteries For Solar Panels
We have selected the 7 best storage batteries for solar systems, organized in function of their storage capacities.
In this review, we only focus on 12V batteries.
50Ah (600Wh) Storage Batteries
50Ah is enough for smaller systems or mobile applications like DIY solar generators, and camping trips.
Ampere Time 12V 50Ah
AmpereTime is a Chinese battery manufacturer with more than 10 years of experience in LiFePo4 batteries for solar panels.
We love this 50AH battery by AMPERETIME, it combines all the qualities for a great solar battery at the best possible price. It can achieve full discharge, it’s resistant to vibration, and it’s ready to be installed in your RV in combination with solar panels. It is extremely durable with up to 8,000 cycles and a 10-year lifespan.
Also a perfect choice for camping: lightweight (14.33lbs) and robust with IP65 certification (waterproof).
- Up to 8000 cycles, 10 years
- 5-years warranty
- IP65 (waterproof)
- Well priced
- Powerful (50Amps, 640W)
- Cannot be charged if the temperature is below 32°F
A great battery for entry budgets but with the qualities of higher-end models. Versatile, you can add up to three extra batteries in parallel to reach larger capacities.
RENOGY 12V 50Ah
Renogy is a reputed brand, specialized in all aspects of solar energy: production, storage, and management.
Like all Renogy’s products, this 50Ah battery is built with high-quality materials.
It comes with a 5-year warranty and a reliable built-in BMS that will efficiently balance and protect your battery cells. The battery is certified to retain 80% of its initial capacity after 2,000 cycles performed at 0.2C ( 120 per hour for 10 hours).
Powerful, it can deliver up to 640W, and if you need more, it can easily connect extra batteries in parallel.
- 80% initial capacity after 2’000cycles
- 5-years warranty
- High-quality material (BMS, battery cells, and casing)
- 640W of power output
- No IP65 certification
This solar battery from RENOGY is a great choice to build a robust system connected to solar panels. It will last for long, and won’t fail, thanks to a high-quality manufacturing process.
100Ah (1200Wh) Storage Batteries
100Ah gives you enough energy to power small appliances like mini-ref, fans, computers, TVs…
TALENTCELL 12V, 100AH
Talentcell is a Chinese company, created in 2001. NiMH and Lithium batteries are their specialty.
This 100Ah battery by Talentcell shows impressive specifications given its low price.
It is designed to last long – after 3500 cycles (10 years) at 80% DOD (depth of discharge), it will still retain more than 70% of its initial capacity. It can also deliver up to 960W continuously and comes with a LED battery monitoring screen on top of the battery case.
Finally, if you need more storage capacity you can always upgrade your system by connecting three extra batteries in parallel.
- Great life duration (3500 cycles, 10 years
- 960W continuous power
- Full charge in 2 hours
- Well priced
- Only 18 months warranty
- Only for indoor use (32°F to 140°F)
A durable entry-level choice by TalentCell. Not the highest power output and warranty but its price is the lowest, by far.
Zooms 12V 100Ah
ZOOMS is a Chinese manufacturer, a newcomer in the battery world. However, their products show competitive specifications.
One of our best picks for a 100Ah battery for solar panels.
It combines long life duration with up to 5,000 cycles at 80% DOD(10 years), power (1280W), and safety, thanks to the quality built-in BMS. It is ready for quick charge (up to 100Amps, 2 to 3 hours to full charge) and can provide pick power (3,000W, 5 sec), perfect to start a water pump for example.
Ultimately, it comes at a fair price with a 5-year warranty.
- Durable (5’000 cycles, 10 years)
- Powerful (1280W, peak 3000W)
- 5-years warranty, US-based technical support
- Well priced
- Higher self-discharge rate (1-year storage)
Absolutely recommended. Great price, great specifications, efficient customer service, the 100Ah battery by ZOOMS is your best choice for a versatile battery to store your solar energy.
FLYPOWER 12V 100Ah
FLYPOWER is a Chinese battery company with more than 15 years of experience in Lithium, NiCd, and NiMH battery manufacturing.
The 100Ah lithium battery by FLYPOWER benefits from multiple innovations thanks to a solid R&D team.
It is durable, offering up to 7,000 cycles and a 10-year lifespan. In addition, it delivers up to 1280W of continuous power and 2500W of peak power. It can be quickly charged in 2 to 3 hours. Thanks to the built-in BMS it shows excellent safety performances.
Finally, it is very well priced and comes with a 5-year warranty.
- Durable (up to 7’000 cycles, 10 years)
- Powerful (1280W continuous, 2500W peak)
- Ready for quick charge
- Well priced
- 5-years warranty
- No US-based customer service
- Not the best casting material
Built with grade A battery cells, this lithium battery by Flypower will work great in combination with your solar panels. We recommend it for its durability and fair price.
200Ah (2400Wh) Storage Batteries and above
To cover all your needs and your solar panel production (1kW+) in an off-grid system, 200Ah (and above) batteries are your best choice.
ExpertPower 12V 200Ah
ExpertPower is a US-based company with expertise in energy storage solutions. They also offer a large range of products for off-grid projects.
With a 200Ah storage capacity, this 12V LiFePo4 battery by ExpertPower will store a large quantity of solar energy (2.4 kWh).
Thanks to a well-designed built-in BMS, it delivers up to 1800W continuously (2400W peak). It is certified to last 3500 cycles (10 years, at 80% DOD) and comes with a 1-year warranty.
The only negative point would be a lower charging current of max. 50 Amps (6 hours to full charge).
- 3500 cycles (10 years)
- Quality BMS
- High output power (1800W, peak 2400W)
- 1-year warranty
- Low charging speed (50Amps, 6 hours to full charge)
A great lithium battery for solar panels by ExpertPower. Durable and powerful, it will work perfectly in combination with a solar charger and an inverter.
JITA 12V 300Ah
This is the most powerful lithium battery from JITA, a Chinese energy storage company.
This LiFePo4 combines the highest storage capacity (3600Wh) and power output (2500W, peak of 3300W) of all our lithium batteries for solar panels.
In addition, it is highly durable (10 years, 4,000 cycles), supports quick charge (7 hours with solar panels), and can be mounted in parallel/series for even more power. This battery has many applications, and can easily supply electricity to your whole house.
In summary, it is very well priced, comes with a 3-year warranty and US-based technical support.
- High storage capacity (3.6kWh)
- Powerful (2500W)
- Durable (4’000 cycles, 10 years)
- 3-years warranty
- Heavy (68 pounds)
This battery is recommended if you need superior storage capacities and power output. Combine 4 batteries and you will exceed the specification of a Tesla Powerwall for a fraction of its price.
An essential addition to your solar system. Once expensive, lithium batteries are now the cheapest way to store your solar energy thanks to technical improvements and drastic price reductions.
They are now extremely durable (10 years). In combination with solar panels, they are becoming cheaper than utility grid electricity.