In our guide on comparing solar batteries, our main objective is to assist you in evaluating popular Lithium-ion batteries and finding the optimal solar battery solution. We thoroughly analyse these features, all with the ultimate goal of identifying a battery that offers exceptional specifications at an affordable price.
Choosing the battery bank is a crucial step towards achieving energy independence; however, when you’re starting your journey, it’s completely normal to feel unsure about which factors to consider. The wide range of battery types can make the decision-making process quite daunting.
When it comes to batteries, lithium solar battery systems are undeniably the top choice. These batteries provide benefits, including long lifespans, minimal maintenance requirements, and easy installation, monitoring through your inverter and it stores the solar energy generated by your solar panels.
Identifying the best lithium-ion battery for your solar needs may not be all that simple. There are several factors to consider:
- Number of cycles
- Depth of discharge (DOD)
- C-Rating (Discharge rate in kWh)
- How expandable is the battery bank (Number of batteries you connect in parallel)
- Mounting Type
- Price point
- Warranty
- Technical Support
Solar Battery Comparison: The Basics
Battery Lifespan: Cycles
The number of cycles refers to the number of times a battery can be charged and discharged. A full cycle or one cycle is when a battery undergoes a full charge and discharge.
Depending on the type of solar system kit, the average solar battery will experience up to 2 cycles per day, especially in the winter and fewer times during the summer.
It’s important to mention that battery manufacturers usually specify the number of cycles for each battery model. However, recently some battery manufacturers have been introducing improved solar batteries that allow a discharge rate at 0.5C and 1C it’s important to note that in cases like this, should you use a high discharge rate of 1C then your battery lifespan will reduce between 30-50%.
C-Rating
The C rating indicates the maximum discharge rate of a battery. A battery with a 0.5C rating can discharge at 50% of its rated power, whereas a battery with a 1C rating can discharge at its full rated power.
For example: We have 5.12kWh battery that has a Depth of Discharge (DoD) of 90%, it’s important to also account for the power required by the Battery Management System (BMS). Suppose it consumes 0.12kW of power. In this case, subtracting the BMS power from the total capacity, you can safely discharge 4.488kW (90% of the 5.12kW – 0.12kW) for the actual use before reaching the DOD limit.
Mounting Types
In this article, we will explore the benefits and potential uses of different mounting options. Specifically, there are typically three primary mounting types to consider: wall-mounted, floor-mounted, and rack-mounted. It’s worth noting that floor-mounted batteries are often chosen for their stackable design and convenience.
Solar Battery Comparison: Lithium-ion Battery Data Comparison
For the benefit of convenience, here’s a side-by-side comparison of seven essential data points to consider when evaluating a solar battery:
| Solar Battery | Cycles | DOD | C-Rating | Parallel | Mounting Type | Price | Warranty |
|---|---|---|---|---|---|---|---|
| Deye 6.4kWH | 6000 | 90% | 0.5 | 32 | Wall/Floor | R35,075.00 | 10 Years |
| Lumo 5.12kWh | *3500/6000 | 100% | *1/0.5 | Rack | R23,920.00 | 10 Years | |
| Dyness 3.6kWh | 6000 | 80% | 0.5 | 40 | Rack | R18,975.00 | 10 Years |
| Dyness 5.12kWh | 6000 | 80% | 0.5 | 16 | Wall | R24,725.00 | 5 Years |
| PylonTech 4.8kWh | 4500 | 95% | 0.5 | 16 | Rack | R25,300.00 | 5 Years |
| Shoto 5.12kWh | 5000 | 90% | 1 | 20 | Rack | R24,150.00 | 5 Years |
| HinaESS 5.12kWh | 6000 | 90% | 1 | 32 | Rack | R24,150.00 | 10 Years |
| Hubble 5.5kWh AM2 | *3000/6000 | *100%/50% | 1 | 8 | Wall/RackRack | 10 Years | |
| Sunwoda 5.12kWh | 6000 | 90% | 0.5 | 24 | Rack | R23,575.00 | 10 Years |
Solar Battery Comparison: Solar Battery Life Span
Understanding the lifespan of your chosen battery is essential, and it hinges on two primary factors: the number of cycles it can endure and, in some instances, the warranty period. A battery’s durability is fundamentally determined by how many charge and discharge cycles it can reliably handle.
In practical terms, you can expect to cycle your battery bank once a day, with a rare maximum of two cycles daily. To provide a clear comparison, we’ve broken down the expected lifespan of various battery banks based on their specified life cycles. This analysis includes scenarios for both one and two cycles per day, offering a precise depiction of how long a Lithium-ion battery bank can maintain its performance
| Number of Cycles ÷ by 1 Year (365 days) | Life Expectancy | Number of Cycles ÷ by 2 Years (730 days) | Life Expectancy |
|---|---|---|---|
| 6000 Cycles ÷ 365 days | 16.44 Years | 6000 Cycles ÷ 730 days | 8.22 Years |
| 4500 Cycles ÷ 365 days | 12.33 Years | 4500 Cycles ÷ 730 days | 6.16 Years |
| 3000 Cycles ÷ 365 days | 8.22 Years | 3000 Cycles ÷ 730 days | 4.11 Years |
Solar Battery Comparison: Depth of Discharge
As mentioned earlier, the Depth of Discharge (DOD) is a key factor in understanding how much of your battery’s power capacity you can use effectively. Lead-acid batteries typically offer a DOD of around 50%, meaning you can use only half of their capacity. On the other hand, Lithium-ion batteries provide a much higher DOD, usually ranging from 80% to 100%, allowing you to use a larger portion of their capacity.
Let’s take a look at 3 batteries with different DODs.
| Lumo L51100 | Dyness BX51100 | PylonTech UP5000 |
|---|---|---|
| Storage Capacity: 5.12kWh | Storage Capacity: 5.12kWh | Storage Capacity: 4.8kWh |
| DOD: 100% | DOD: 80% | DOD: 95% |
| Usable Capacity: 5.12kWh | Usable Capacity: 4.1kWh | Usable Capacity: 4.56kWh |
Solar Battery Comparison: C-Rating
A battery with a 1C rating is ideal for powering energy-intensive appliances, especially those like heating devices that require a surge of power when turned on. This added discharge capacity helps prevent system tripping due to sudden high-power demands.
If your aim is to get as close to an off-grid setup as possible, we recommend considering a 1C-rated battery. You can explore our range of 1C-rated batteries below to find the right one for your needs.
Solar Battery Comparison: Future Expansion
When choosing the ideal battery solution for your home, it’s vital to grasp the flexibility of your battery bank. Furthermore, as households expand to accommodate more family members and additional appliances, the need for extra battery storage naturally grows.
Parallel
Understanding how many batteries you can add to your solar system, which we refer to as “parallel,” is a handy detail often found on the battery datasheet.
For most average homes, a 5.12kWh lithium-ion battery should handle load shedding and nightly cycling well. However, you may want to expand your battery bank for more coverage.
Oversizing your battery bank is a wise move because it prevents excessive use of your batteries, making them last longer and reducing the need for frequent replacements.
Solar Battery Comparison: battery Mounting Types
There are two common ways to mount batteries, and your choice largely depends on where you want to install your battery bank.
Let’s look at these mounting options and the spaces that suit them best.
Wall-Mounted
Wall-mounted batteries are great for saving space since they are placed near or under your solar inverter. This setup keeps your battery bank out of the way and shields it from potential damage.
Wall-mounted batteries are an ideal choice for:
- Single garages.
- In-home installations.
- Homes with limited available space.
In addition, they create a tidy and sleek appearance for your solar setup, making them a great fit for anyone with available wall space.
Rack-Mounted
Rack-mounted batteries provide impressive flexibility due to their compact dimensions, easy installation process, and capacity for expansion. It’s worth highlighting that these batteries do necessitate a 1m x 1m floor space specifically for the battery cabinet.
Rack-mounted batteries are an excellent choice for:
- Larges garages
- Dedicated room/storage area
- Homes with spacious areas
Some rack-mounted brands offer sleek and stylish cabinets as an option. These cabinets serve a dual purpose: they not only enhance the aesthetics but also provide practical protection for your battery bank, shielding it from dust, debris, and accidental foot traffic.
Solar Battery Comparison: Pricing & Warranties
Your battery bank is indeed the most significant investment in your solar system. However, its cost-effectiveness is determined by the benefits it provides.
It’s important to factor in the warranty duration as well. These warranties typically range from 5 to 10 years, so you’ll want to ensure you have adequate coverage in case any issues arise with your batteries.
Some brands offer longer warranties when you follow their recommended usage guidelines, while others have a standard warranty that you can extend by registering your solar battery.
In this section, we will clarify that even if the initial upfront cost appears expensive, the expense per cycle of your solar lithium-ion battery can be quite economical with a low cost per cycle.
| Solar Battery | Price | Cost per kWh | Cycles | Cost per Cycle | Warranty |
|---|---|---|---|---|---|
| Deye 6.4kWH | R35,075.00 | R5,480.00 | 6000 | 10 Years | |
| Lumo 5.12kWh | R23,920.00 | R4,671.87 | *3500/6000 | 10 Years | |
| Sunwoda SunESS 5.12kWh | R23,575.00 | R4,577.66 | 6000 | 10 Years | |
| Dyness 5.12kWh | R24,725.00 | R4,829.10 | 6000 | 5 Years | |
| PylonTech 4.8kWh | R25,300.00 | R4,854.00 | 4500 | 5 Years | |
| Shoto 5.12kWh | R24,150.00 | R4,716.79 | 5000 | 5 Years | |
| HinaESS 5.12kWh | R24,150.00 | R4,716.79 | 6000 | 10 Years | |
| PylonTech 3.5kWh | R21,275.00 | R6,078.00 | 6000 | 7-10 Years |
Solar Battery Comparison: Optimal Choice
The solar market in South Africa is evolving rapidly, bringing in new solar battery options. Finding a reliable brand and the right solar battery to meet your needs can be challenging during this change. Brands like PylonTech and Dyness solar batteries have a strong reputation in the South African market.
Over the years, we’ve seen solar batteries grow in storage capacity, which helps reduce upfront costs. However, it’s essential to note that not all solar batteries are suitable for South Africa.
Lithium batteries are particularly well-suited for efficient energy storage, ensuring a dependable power supply even during ongoing load shedding challenges.