Rolls Surrette S6-L16-HC 445Ah 6V Flooded Lead-Acid Deep-Cycle Battery Module

The Rolls Surrette S6-L16-HC is a 6V flooded deep cycle battery rated at 445Ah at the 20-hour rate, built to the Group L16 / 903 form factor as part of Rolls' FLA Series 4000 — the brand's premium flooded lead acid line constructed with 17 plates per cell for extended cycle life in off-grid solar, RV, marine, and remote power applications. Manufactured in Canada and designed in compliance with BCI, DIN, BS, and IEC standards, it is a high-plate-count, high-capacity wet cell battery for buyers who need maximum Ah per dollar in a proven flooded chemistry and are prepared to perform the periodic maintenance that flooded batteries require. Available through A1 SolarStore for off-grid and renewable energy battery banks.

Key specifications

• Nominal voltage: 6V; cells: 3; plates per cell: 17
• Capacity by discharge rate: 512Ah @ C100 / 445Ah @ C20 / 401Ah @ C10 / 356Ah @ C5 / 209Ah @ C1
• Chemistry: Flooded lead acid (FLA) — vented wet cell; requires periodic water addition and ventilated installation space
• Group size: L16 / 903 (FLA Series 4000)
• Reserve capacity: 861 minutes @ 25A; 226 minutes @ 75A
• CCA / MCA: 1,040A @ 0°F (-18°C) / 1,299A @ 32°F (0°C)
• Charge voltage range: 2.45–2.5 V/cell @ 77°F (25°C) — 14.7–15.0V for 6V battery; float: 2.25 V/cell (13.5V)
• Recommended / max. charge current: 50A / 85A
• Self-discharge: 5–10% per month @ 77°F (25°C)
• Temperature capacity derating: 105% @ 104°F / 100% @ 77°F / 75% @ 32°F / 50% @ 5°F
• Electrolyte reserve: 2.25 in. (57 mm)
• Terminal type: LT (5/16"-18 S/S hex cap screw, nut, lock and flat washer included)
• Dimensions (L × W × H incl. terminal): 12.5 × 7.13 × 16.75 in. (318 × 181 × 425.5 mm); weight: 122.5 lbs. (55.5 kg)
• Container / cover: High-density polypropylene; UL94 HB flame rating; integral flame arrestor vent caps
• Certifications: BCI and IEC standards compliant; Intertek certified; CE marked
• Warranty: 3 years

17 plates per cell and FLA Series 4000 construction

The S6-L16-HC belongs to Rolls' FLA Series 4000 — distinguished from standard flooded L16 batteries by its 17-plates-per-cell construction. Plate count is the primary determinant of cycle life in flooded lead acid batteries: more plates increase active material surface area, distribute charge and discharge current more evenly across the cell, and reduce the depth of sulfation at any given discharge level. The cycle life chart shows the S6-L16-HC approaching 4,000–5,000 cycles at shallow depths of discharge and maintaining 1,000 cycles at 50% DoD — performance that standard 9-to-11-plate flooded L16 batteries cannot match. For an off-grid solar bank that cycles daily, the higher upfront cost per cell is offset by the extended replacement interval that the additional plate count delivers.

Flooded chemistry: advantages, requirements, and maintenance

Flooded lead acid batteries deliver more usable capacity per dollar than AGM at equivalent plate counts, and the S6-L16-HC's 512Ah at the 100-hour rate reflects this. The vented cell design allows gas to escape during charging and permits equalization charging — a periodic overcharge that desulfates the plates and balances cells across the bank, extending overall service life in ways that sealed AGM batteries cannot accommodate. The tradeoff is maintenance: the S6-L16-HC requires periodic electrolyte level checks and distilled water additions, proper ventilation to exhaust hydrogen gas during charging, and protection from freezing temperatures in deeply discharged states. The 2.25 in. (57 mm) electrolyte reserve above the plates provides a comfortable margin between maintenance intervals at recommended charge rates.

Capacity across discharge rates and temperature

Like all lead acid batteries, the S6-L16-HC's delivered capacity varies significantly with discharge rate and temperature. At the standard C20 rate the battery delivers 445Ah; at the slower C100 rate — typical of low-draw solar storage — it delivers 512Ah, 15% more. At the C5 rate, representing a heavy load, capacity drops to 356Ah. Temperature derating is significant: at 32°F (0°C) the battery delivers approximately 75% of its rated 77°F capacity, and at 5°F (-15°C) only 50%. Battery banks in cold climates must be sized upward to account for winter derating, and the cells should never be allowed to sit at a low state of charge in freezing temperatures, where electrolyte freeze risk increases with discharge depth.

Series wiring for higher system voltages

The S6-L16-HC is a 6V battery and must be wired in series to reach the voltage required by most inverters and charge controllers. Two units in series yield a 12V / 445Ah bank; four units yield a 24V / 445Ah bank; eight units yield a 48V / 445Ah bank. Capacity does not change with series wiring — only voltage. For additional Ah at a given voltage, series strings are wired in parallel. Optional 19-inch 4/0 AWG interconnect cables are available from Rolls for inter-battery connections within the bank.

Applications: off-grid solar, RV, marine, and remote power

• Off-grid solar: Series banks of four or eight units at 24V or 48V; high plate count supports daily cycling over multi-year service life; equalization charging compatible.
• RV and marine house banks: High Ah capacity and proven flooded chemistry for extended off-hook or offshore autonomy; vented installation required.
• Remote and telecom power: 512Ah at C100 suits very low draw applications with long autonomy requirements between recharge events.
• Genset-backed off-grid systems: 85A maximum charge current allows reasonably fast recharge from a generator between solar days.

Why choose the Rolls Surrette S6-L16-HC?

The Rolls Surrette S6-L16-HC is the right choice for off-grid solar buyers who want maximum cycle life from a flooded lead acid battery and are committed to performing the maintenance that flooded chemistry requires. The 17-plates-per-cell Series 4000 construction delivers a cycle life chart that standard-plate L16 flooded batteries cannot match, and the 512Ah C100 capacity makes it one of the higher-capacity Group L16 options in the category. For buyers who prefer the proven economics and equalization-compatible longevity of premium flooded lead acid over sealed AGM, the S6-L16-HC is available through A1 SolarStore.