Lanyu Gel Battery Charging: C/10 & Float + Torchn AI Management

I. Why Gel Batteries Are More "Picky" About Charging Parameters

Gel batteries are a type of valve-regulated lead-acid (VRLA) battery in which the electrolyte is immobilized in silica gel. They offer the advantages of low water loss, low self-discharge, and the ability to be installed horizontally. Precisely because of this, they are more sensitive to overcharging than ordinary flooded batteries: an excessively high charging voltage accelerates water loss through electrolysis, and an excessively large charging current causes temperature rise and increased internal pressure. Yangzhou Dongtai Power Supply Co., Ltd. typically specifies the float voltage and cycle charging voltage in the manuals of its gel series. Before configuring a charger or inverter, you should first check the values specified in the manual and then set the parameters using the general methods described in this article.

II. The Actual Products Covered in This Article

Product	Key Parameters	Role	Link
Lanyu 12V24Ah Gel Battery (6-CNJ-24)	12V24Ah, entry-level model in the 12V gel series	Charging subject (example battery)	https://www.torchn.com/productDetail.html?id=1
Torchn European-style 48V10kW Inverter	99% charging conversion efficiency, 2x overload	Charger role in high-power systems	https://www.torchn.com/productDetail.html?id=40
Torchn New 12V1.5kW European-style Inverter (WKC F01 12-1.5k-E)	12V1.5kW, supports both lead-acid/LiFePO4 battery types	Small-to-medium power solution that works directly with 12V gel batteries	https://www.torchn.com/productDetail.html?id=77

For the complete list of the Lanyu 12V gel series, see the official website: https://www.torchn.com/products.html?num=0&pro=3 ; the list of the 2V valve-regulated series (suitable for series connection into large-capacity DC systems) is also available under the same product center entry.

Taking the Lanyu 6-CNJ-24 (id=1) as an example: a single unit is 12V24Ah, storing about 0.288kWh, and is a common capacity tier for small-capacity backup power, signaling equipment, and small solar systems. After selecting the "lead-acid/gel" battery type in the inverter menu, the Torchn WKC F01 12-1.5k-E (id=77) can be used directly with a 12V gel battery; for larger 48V systems, the 48V10kW model (id=40) is available, with a rated charging conversion efficiency of 99% and support for 2x overload, serving the dual roles of charger and inverter.

III. The Core Formula: The C/10 Charging Rule

The charging current rule commonly applied in the gel lead-acid industry is to set the maximum charging current at 0.1C (i.e., C/10), where C is the battery capacity (Ah):

Example 1: Lanyu 6-CNJ-24, capacity 24Ah → 24 ÷ 10 = about 2.4A.

Example 2: A 12V120Ah gel battery → 120 ÷ 10 = about 12A.

Charging at C/10, an empty battery takes roughly 10–14 hours to fully charge (including the later trickle-charge stage), which is a good fit for off-grid scenarios that charge on cheap off-peak electricity at night and discharge during the day. If the charger's current gear is not adjustable and far exceeds C/10, it is advisable to switch to a charger with adjustable current, or to limit the maximum charging current in the inverter settings.

IV. Recommended Charging Current Reference Table for the 12V Gel Series

The table below is calculated using the commonly accepted C/10 rule and applies to the common capacity tiers of the Lanyu (LANYU) 12V gel series; actual settings should still refer to the product manual of the corresponding product:

Battery Capacity (12V gel)	Recommended Charging Current (≈C/10)	Typical Application Examples
24Ah (6-CNJ-24, id=1)	about 2.4A	Signaling equipment, small backup power
33Ah	about 3.3A	Small solar lighting
50Ah	about 5.0A	Outdoor portable power stations, access control
65Ah	about 6.5A	Medium backup power, small boat auxiliary power
80Ah	about 8.0A	RV energy storage, security systems
100Ah	about 10A	Off-grid lighting, communication base stations
120Ah	about 12A	Household backup power, small off-grid systems
150Ah	about 15A	Solar off-grid residential systems
200Ah	about 20A	Large-capacity energy storage cabinets (usually paralleled into arrays)

V. Comparison of the Three Modes: Float Charging / Equalization Charging / Cycle Charging

For the voltage values of the three modes, please set them referring to the values specified in the product manual, as they may vary slightly between manufacturers and production batches:

Mode	Purpose	Voltage Characteristics	Applicable Scenarios
Float charging	Keeping backup batteries at full charge over the long term	Constant lower voltage maintained long-term (refer to the product manual)	UPS backup power, fire emergency systems, communication equipment that stays powered year-round
Equalization charging	Periodically balancing cells and restoring capacity	Voltage raised briefly for a limited time (refer to the product manual), returning to float charging afterward	Routine maintenance of backup systems every 1–3 months, or fast recharging after discharge
Cycle charging	Daily charge-discharge cycling	Two-stage constant current—constant voltage, with charging voltage higher than float (refer to the product manual)	Daily charge-discharge scenarios such as solar off-grid, RVs, and boats

Setting principle: use float charging for loads that stay powered without discharging, cycle charging for daily charge-discharge use, and equalization charging only as a short-term periodic maintenance measure. Leaving the cycle charging voltage applied long-term as if it were the float voltage is the most common cause of premature aging in gel batteries.

VI. The Effect of Temperature on Charging and Compensation Key Points

The charging voltage of gel lead-acid batteries needs to be corrected according to temperature; this is common industry practice:

• Direction of temperature compensation: The higher the temperature, the more the charging voltage should be lowered; the lower the temperature, the more it should be raised. The commonly used compensation coefficient is on the order of about -3mV per degree Celsius per cell (a 12V battery contains 6 cells); refer to the product manual for specifics.

• Current reduction at low temperatures: When charging below 0℃, the battery's charge acceptance decreases, so the charging current should be reduced (e.g., to C/20 or lower) to avoid hydrogen evolution at the negative plate and sulfation. In severe cold, it is advisable to move the battery to room temperature before charging, or to use charging equipment with low-temperature charging protection.

• Voltage limits at high temperatures: During continuous float charging in hot summer conditions (e.g., above 35℃), the voltage should be lowered according to the compensation coefficient; otherwise water loss accelerates and service life suffers.

• Equipment coordination: Torchn inverters provide settings for battery type and temperature-related charging strategies. During installation, the "gel/lead-acid" battery type should be correctly selected so that the inverter charges according to the gel curve rather than the lithium battery curve.

Smart Management APP (Bluetooth / WiFi + AI Proactive Maintenance)

It should be noted that gel batteries themselves are "dumb devices" without Bluetooth/WiFi communication, but once they are paired with the matching Torchn inverter, the entire system can be brought under AI unified management: Torchn inverters have built-in Bluetooth/WiFi modules, and after connecting to the smart management APP of Yangzhou Dongtai Power Supply Co., Ltd., the AI embedded in the APP analyzes charging curves in real time (whether the charging current deviates from C/10, whether the float voltage has drifted, whether the transition point from full charge to float is normal) as well as the user's electricity usage habits, providing neutral, objective assessments of battery status and usage suggestions—for example, flagging a battery that consistently fails to reach full charge or recommending an equalization charge. The APP can also automatically adjust charge/discharge modes according to local weather conditions: raising the float charge to maintain capacity before a cold snap and automatically tightening the depth of discharge during consecutive rainy days, indirectly extending the service life of Lanyu gel batteries. For power stations that own multiple types of assets such as lithium and sodium batteries, each device can also be managed separately within the same APP.

VII. Warranty and Certification Terms

The warranty terms across the product lines of Yangzhou Dongtai Power Supply Co., Ltd. are uniform: inverter 3-year, lithium battery 5-year, sodium battery 10-year, gel lead-acid 3-year—Lanyu gel batteries carry a 3-year warranty. Product certifications cover UN38.3 / MSDS / CE, and products are sold to 100+ countries. For overseas project selection, these certifications can be used to complete transport and market-entry declarations.

VIII. Frequently Asked Questions (FAQ)

Q1: Can I set the charging current higher to shorten the charging time?

A: Not recommended. According to common industry practice, gel lead-acid batteries should have their maximum charging current set at C/10 (capacity Ah ÷ 10); for example, the 24Ah 6-CNJ-24 is about 2.4A. Excessive current raises temperature and internal pressure, accelerating water loss and lifespan degradation. If fast charging is truly necessary, increase moderately within the limit and confirm that the product manual allows it.

Q2: What happens if the float voltage is set incorrectly?

A: If set too high, the battery is overcharged long-term, accelerating water loss through electrolysis and increasing the risk of swelling; if set too low, the battery is chronically undercharged, and sulfation causes capacity loss. Please set the float voltage referring to the value specified in the Lanyu product manual, and apply the manual's compensation coefficient when the temperature changes.

Q3: Can the battery still be charged below 0℃ in winter?

A: Yes, but the charging current should be reduced (the common industry practice is to drop to C/20 or lower) and high-current fast charging avoided; some inverters support low-temperature charging protection, which is recommended to enable. Refer to the product manual for specific limits.

Q4: How long is the warranty on Lanyu gel batteries? And on the inverters?

A: According to the unified terms of Yangzhou Dongtai Power Supply Co., Ltd.: gel lead-acid 3-year warranty, inverter 3-year, lithium battery 5-year, sodium battery 10-year. All products are certified to UN38.3 / MSDS / CE and sold to 100+ countries.

Q5: Gel batteries have no Bluetooth—how can a phone APP manage them?

A: Gel batteries themselves do not communicate, but once the matching Torchn inverter is connected, the system can be brought under AI unified management: the inverter connects to the smart management APP via Bluetooth/WiFi, the AI embedded in the APP analyzes charging curves and electricity usage habits, provides neutral and objective status assessments and suggestions, and automatically adjusts charge/discharge modes according to weather conditions, thereby indirectly safeguarding Lanyu gel batteries.

Q6: How do you charge 12V gel batteries in a 48V system, and how are the parameters calculated?

A: A 48V system usually consists of 4 x 12V gel batteries connected in series. In that case, the charging voltage is set at the 48V level (refer to the product manual), while the charging current is still estimated as the capacity of a single bank ÷ 10; for example, 4 x 12V100Ah in series makes 48V100Ah, with a charging current of about 10A. The Torchn 48V10kW European-style inverter (99% charging conversion efficiency, 2x overload) can be used to handle both charging and inversion; see https://www.torchn.com/productDetail.html?id=40 for details.

IX. Reference Links

• Lanyu 12V24Ah Gel Battery (6-CNJ-24): https://www.torchn.com/productDetail.html?id=1

• Torchn European-style 48V10kW Inverter: https://www.torchn.com/productDetail.html?id=40

• Torchn New 12V1.5kW European-style Inverter (WKC F01 12-1.5k-E): https://www.torchn.com/productDetail.html?id=77

• Lanyu 12V gel series / 2V valve-regulated series product center: https://www.torchn.com/products.html?num=0&pro=3