HGUC — Lead-Carbon Battery for Microgrid and Frequent Micro-Cycle Storage

12 lead-carbon models from 65 Ah to 2000 Ah — engineered for partial state-of-charge operation in hybrid renewable plants

Where solar PV, wind and unstable-grid diesel hybrid systems dominate, the battery no longer sees one deep cycle per day — it sees dozens of small micro-cycles superimposed on a baseline state of charge that rarely hits 100 %. Flat-plate AGM fails quickly in this regime. Tubular GEL survives longer. But the chemistry that was built from the start for partial state-of-charge is lead-carbon: a flat-plate AGM cell whose negative plate is doped with activated carbon to suppress sulphation. The HGUC family is the lead-carbon branch of the HGU platform, delivering over 4000 cycles at 50 % partial state-of-charge and tolerating the rapid-charge, micro-cycle profile of modern hybrid microgrids.

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What is the HGUC?

HGUC is the lead-carbon branch of the HGU platform. Inside each cell, the negative active material is doped with a high-surface-area activated carbon that absorbs and releases sulphate ions during the micro-cycles, suppressing the hard-sulphation that destroys a flat-plate AGM cell in partial state-of-charge service. The positive plate is a standard flat pasted plate, the electrolyte is liquid sulphuric acid of optimised density, and the cell is sealed VRLA with a one-way pressure-relief valve. The result is a lead-acid cell that you can leave at 50 % state of charge for months on end and still get full capacity back on the next equalisation cycle.

• 12 capacity steps from 65 Ah to 2000 Ah (C10 rate, 1.80 V/cell end voltage)

• 2 V cells and 12 V monoblocs on the same platform

• Lead-carbon negative plate, sealed VRLA construction

• Cycle life over 4000 cycles at 50 % PSoC, over 5000 cycles at 40 % PSoC

• Fast-charge acceptance 2.5× standard AGM

• Float design life 15 years at 25 °C

Where HGUC fits

HGUC was designed for the new duty profile of renewable-integrated storage:

• Solar PV microgrids and remote-community hybrid plants

• Wind-PV-diesel hybrid remote sites

• Peak-shaving behind-the-meter battery banks

• Frequency-regulation and virtual-power-plant storage

• Off-grid agricultural and irrigation systems

• Telecom towers on weak-grid or solar-only supply

• Behind-the-meter commercial PV-backup

Why choose the HGUC series

1. Built for partial state-of-charge operation

• Carbon-doped negative plate suppresses PSoC sulphation

• Survives thousands of micro-cycles at 30–70 % state of charge

• Equalisation recovers capacity lost to extended PSoC exposure

2. Fast-charge acceptance

• Accepts charge at 0.3 C to 0.5 C without gassing

• Cuts the recharge window after a peak-shave event by half versus standard AGM

• Compatible with rapid-MPPT solar charge controllers

3. Wide operating temperature range

• Operating window -20 °C to +45 °C without capacity loss

• Lower thermal runaway risk than AGM at high ambient temperature

• Suitable for outdoor cabinets and rooftop battery rooms

4. Strong over-discharge recovery

• Recoverable from deep discharge when re-charge starts within 48 hours

• Tolerates accidental over-discharge better than flat-plate AGM

Common platform across the HGUC family

• Lead-carbon negative plate, flat-pasted positive plate, sealed VRLA construction

• Float voltage 2.23–2.27 V/cell at 25 °C, temperature-compensated -3 mV/°C/cell

• Equalise / cycle charge 2.30–2.40 V/cell for up to 24 h

• Operating temperature -20 °C to +45 °C (recommended 20–25 °C)

• Self-discharge below 3 % per month at 25 °C

• Container and cover ABS, flame-retardant to UL94 V-0 on request

• Cycle life over 4000 cycles at 50 % PSoC, over 5000 cycles at 40 % PSoC

All 12 HGUC models at a glance

Lead-carbon cells in 2 V and 12 V form factors; dimensions in millimetres

Cycle life reference

• Over 4000 cycles at 50 % partial state-of-charge at 25 °C

• Over 5000 cycles at 40 % partial state-of-charge at 25 °C

• Cycle life at elevated temperature derates by ~50 % per 8 °C above 25 °C

• Partial state-of-charge operation does not accelerate capacity loss in HGUC, unlike flat-plate AGM

Operating conditions

• Float voltage: 2.23–2.27 V/cell at 25 °C (temperature-compensated -3 mV/°C/cell)

• Equalise / cycle charge: 2.30–2.40 V/cell for up to 24 h

• Operating temperature: -20 °C to +45 °C (recommended 20–25 °C)

• Self-discharge: below 3 % per month at 25 °C

• Storage re-charge interval: 6 months at 25 °C

• Torque on terminal bolts: 6–8 N·m (F12/F16), 10–12 N·m (F20)

How HGUC compares to HGUG

• HGUG tubular GEL delivers 1500 cycles at 50 % DoD — better for full daily deep cycling

• HGUC lead-carbon delivers over 4000 cycles at 50 % PSoC — better for micro-cycles on a partial state-of-charge baseline

• Both float at the same 2.23–2.27 V/cell and share the same terminal hardware

• Pick HGUG if the battery sees one or two deep cycles per day

• Pick HGUC if the battery sees dozens of small micro-cycles per day on top of a partial SoC baseline

Other HGU battery families

• HGU Series (2 V cells)

• HGU-12V (12 V monobloc)

• HGUX (High-power UPS)

• HGUF (Front-terminal)

• HGUG (Tubular GEL)

• HGUC (Lead-carbon)

• HGUHVC (Lithium cabinet)

Why HG upsboss

HG upsboss is the export brand of Shenzhen Shengpuwei Industrial Co., Ltd., a battery and UPS-systems manufacturer based in Shenzhen, China. We design, build and export VRLA, GEL, lead-carbon and LiFePO4 backup batteries for UPS, EPS, telecom, data-centre and renewable-storage operators in more than 60 countries. Every HGU-series battery ships with type-test reports, full BMS integration where applicable, and the CE / UL / IEC documentation you need for customs clearance and end-user acceptance.

Data security and compliance notice

All product specifications, images and documentation published on this page are the property of HG upsboss / Shenzhen Shengpuwei Industrial Co., Ltd. and are intended for legitimate procurement, engineering and integration use. Reproduction for counterfeit, misbranding or unauthorised resale is prohibited. Specification values are typical at 25 °C and may vary within published tolerances. Battery installations must comply with local electrical, ventilation and transport regulations.

Frequently asked questions

1. What makes lead-carbon different from standard AGM?

The negative plate of a lead-carbon cell is doped with activated carbon. The carbon's high surface area absorbs and releases sulphate ions during the micro-cycles, suppressing the hard-sulphation that destroys a flat-plate AGM cell in partial state-of-charge service. This is the chemistry breakthrough that lets lead-acid survive the duty profile of modern hybrid microgrids.

2. How is HGUC different from HGUG tubular GEL?

Both are deep-cycle batteries, but for different micro-cycle profiles. HGUG is better when the battery sees one or two full daily deep cycles. HGUC is better when the battery stays at a partial state of charge most of the time and experiences dozens of small micro-cycles per day. HGUC also charges faster.

3. Is HGUC a drop-in replacement for an AGM battery?

In most cases, yes. HGUC uses the same float voltage, the same terminal families and the same case footprint as the equivalent-capacity AGM cell. The site controller does not need to be reprogrammed — only the charge profile should be reviewed to take advantage of the faster charge acceptance.

4. Can HGUC be used as a UPS standby battery?

Technically yes, but it is over-specified for the duty. HGUC costs more than an AGM monobloc of the same capacity. For pure float-standby UPS duty with rare discharge events, the HGUX high-power family or HGU-12V monobloc is the more cost-effective choice.

5. What is the recommended equalisation cycle for HGUC?

Equalise at 2.30–2.40 V/cell for up to 24 h every 30 days in PSoC service, or every 90 days in float-standby service. Equalisation mixes the electrolyte and recovers capacity that may have drifted in PSoC operation.

6. Does HGUC need a special charger?

No — HGUC accepts the same lead-acid charge profile as the rest of the HGU platform. The benefit of HGUC is that it accepts charge at higher current (0.3 C to 0.5 C) without gassing, so a charger with adjustable absorption current is preferred to take advantage of the faster recharge.

7. Can HGUC be used indoors?

Yes — HGUC is sealed VRLA with low gas evolution. Standard UPS-room ventilation is sufficient. As with all VRLA batteries, follow local codes for ventilation, spill containment and cabinet clearance.

8. What is the difference between the 2 V cells and the 12 V monoblocs in HGUC?

Both use the same lead-carbon chemistry. The 12 V monoblocs are convenient for smaller battery banks (under 200 Ah) where the DC bus voltage is 12 V or 24 V. The 2 V cells are the building block for 48 V telecom plants and large hybrid microgrid banks from 500 Ah to 2000 Ah per cell.

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