Sacred Sun LiFePO4 Battery Test — 105% of Declared Capacity
Why we test every new battery before recommending it to customers
Recommending a battery to a customer without our own testing is a risk. The LiFePO4 battery market is filled with offers featuring varying real-world characteristics, and the datasheet specifications don't always match what the client actually receives.
That is why, before adding a new battery to our assortment and recommending it for real projects — autonomous systems, backup power, solar installations — we conduct our own tests in our service center.
This time we tested the Sacred Sun SY106 16S100JC — a 51.2V / 100Ah lithium iron phosphate battery. The results turned out to be better than expected.
What was checked during the test
1Real capacity compared to the nominal one
2Voltage of individual cells (balance)
3Cell temperature under load
4Compatibility with the Victron MultiPlus-II inverter
5Correctness of data transmission via BMS
6Display of parameters in the VRM Portal
Key performance indicators based on test results
Capacity exceeded the nominal value by 5%
The actual measured capacity was 105 Ah against the declared 100 Ah. This is a good indicator of production quality: most high-quality LiFePO4 batteries fit within ±3%, and Sacred Sun showed a result above the datasheet specification.
The voltage difference between the highest and lowest cell was only 9 mV (3.341 V and 3.350 V respectively) — this is an excellent balance for a new battery without prior balancing.
Compatibility testing with Victron Energy and DEYE
For real projects, it is critical that the battery does not just "work," but is fully integrated with the inverter: it should transmit data via BMS, correctly display SOC, temperature, and cell voltages, and avoid blocking charging/discharging due to false alarms.
| Parameter | Victron MultiPlus-II GX | DEYE |
|---|---|---|
| BMS ↔ Inverter communication | ✅ Confirmed | ✅ Confirmed |
| Real-time SOC (%) display | ✅ Correct | ✅ Correct |
| Voltage and temperature display | ✅ All parameters | ✅ All parameters |
| Display of individual cell details | ✅ Via VRM Portal | — |
| BMS charge/discharge blocks | 0 blocks | 0 blocks |
| Number of online modules | 1 / 0 offline | 1 / 0 offline |
| Installed / Available capacity | 100 Ah / 48 Ah | 100 Ah / Confirmed |
Sacred Sun LiFePO4 51.2V / 100Ah Characteristics
Electrical parameters
Nominal voltage: 51.2V (48V systems)
Nominal capacity: 100 Ah
Real capacity (test): ~105 Ah (105%)
Chemistry: LiFePO4 (LFP)
Configuration: 16S (16 cells in series)
Model: SY106 16S100JC
Advantages of LiFePO4 chemistry
LiFePO4 is the most stable and safest chemistry among lithium batteries. It is not prone to thermal runaway and retains capacity for 2000–6000 cycles.
It offers a wide operating temperature range, low self-discharge, and the ability to deep discharge up to 80% DOD without significant degradation.
Where we recommend using this battery
What people ask about this battery
How is the 105% capacity confirmed?
The test was conducted by discharging the battery under load down to the lower voltage limit, recording the transferred energy. The measured capacity was ~105 Ah against the datasheet value of 100 Ah. This means the manufacturer did not overstate the specs — on the contrary, they provided a reserve.
Which inverters is Sacred Sun compatible with?
We tested operation with Victron Energy MultiPlus-II GX 48/5000 and DEYE. In both cases, communication via BMS works correctly: the inverter sees the SOC, temperature, and voltage, and does not block charge/discharge. Additionally, Sacred Sun supports a wide list of other manufacturers via CAN or RS485.
How many cycles does LiFePO4 last?
LiFePO4 chemistry provides from 2000 to 6000+ cycles depending on the depth of discharge and temperature conditions. With a standard 80% DOD, the lifespan usually exceeds 3000 cycles, which equates to over 8 years of service under daily use.
What is the warranty for Sacred Sun?
Total-Energo LLC provides warranty and service support for all sold batteries. To clarify the warranty terms for a specific model, please contact us using our contact information.
Our conclusion after testing
Capacity confirmed at 105% of the declared value
Excellent cell balance — difference of only 9 mV
Full compatibility with Victron Energy MultiPlus-II GX
Compatibility with DEYE confirmed
BMS correctly transmits all data to the inverter and VRM Portal
Zero charge or discharge blocks during the test
Why we test ourselves instead of relying on the datasheet
The battery market in Ukraine is actively developing, and with it, the number of offers from suppliers where real specs do not match the declared ones. Understating capacity by 10–20% is a common practice that cannot be detected without direct measurement.
Sacred Sun passed our test and showed a result exceeding its datasheet value. These are the kinds of batteries we recommend for real projects — from household backup power systems to industrial off-grid installations.
Buy Sacred Sun LiFePO4 51.2V / 100Ah
The tested battery is available in the Total-Energo LLC catalog. We will help you configure a solution for your project, select an inverter, and choose compatible components.