HumSienk 12V 310Ah LiFePO4 Lithium Battery — 100A BMS, Low-Temp Protection

Heavy-duty power for boats, RVs, tiny homes, and off-grid solar in Aotearoa. This deep-cycle Lithium Iron Phosphate (LiFePO4) pack delivers long life, stable voltage, and big usable capacity in a lighter, safer form than lead-acid — ideal as a trolling motor battery or house bank.

Key Highlights

• Huge Capacity: 12V 310Ah (≈3.97 kWh) for multi-day off-grid use
  
• Smart Protection: Built-in 100A BMS with low-temperature protection, over-charge/over-discharge, over-current, and over-heat safeguards
  
• Long Life Chemistry: Up to thousands of cycles (LiFePO4) with flat discharge curve for steady performance
  
• Marine & RV Ready: Vibration-resistant design for boats, yachts, campervans, caravans
  
• Solar Friendly: Works with most MPPT/solar chargers configured for LiFePO4
  
• Safe Voltage Class: Operating voltage ≤ 36V (nominal system 12.8V)
  
• Rechargeable & Reusable: Built for daily cycling; minimal maintenance
  
• Brand: HumSienk / HumsiENK
  

Where It Excels (NZ Use Cases)

• Off-grid cabins & tiny homes: Run lights, pumps, DC fridges, routers, and devices overnight
  
• Marine house banks: Support sounders, chartplotters, fridges, lighting, and 12V accessories
  
• Trolling motors: High usable capacity with strong sustained output for long sessions
  
• RV/van life: Pair with rooftop solar for quiet, generator-free camping
  
• Backup power: Keep comms and essentials running during outages
  

Power & Protection, Explained

• 100A BMS (Battery Management System):
  Guards against overcharge, over-discharge, over-current, short-circuit, over-temperature, and low-temperature charge conditions to preserve cell health and user safety.
  
• Low-Temp Protection:
  Prevents charging below safe thresholds (common LiFePO4 requirement) — crucial for winter alpine trips or cool southern nights.
  
• Stable Output:
  LiFePO4 maintains higher voltage during discharge, so 12V appliances and inverters run more efficiently than with lead-acid at the same “percentage.”
  

Suggested System Pairings

• Charging: MPPT solar controller with LiFePO4 profile, 12V alternator-to-battery charger (DC-DC), or LiFePO4-capable mains charger (no equalisation stage)
  
• Inverter: 12V pure sine wave (size to your load; many users choose 1000–2000W)
  
• Solar: 300–800W roof array for RVs/small cabins; scale to your daily kWh need
  
• Wiring: Use appropriately rated cabling, fusing, and lugs; keep cable runs short
  

Practical Runtime Examples*

(*Approximate; real results vary with temperature, inverter efficiency, and depth-of-discharge targets.)

• 12V/5A LED lighting (60W): ~60+ hours
  
• 12V fridge (avg 3A duty): ~80–100 hours between charges
  
• Laptop + modem + lights (~120W total via inverter): ~25–30 hours
  
• Trolling motor 30A cruise: ~9–10 hours continuous (longer with variable speeds)
  

Simple Sizing Tips

1. List your loads (W) and daily hours → get daily Wh.
   
2. Convert to 12V Ah: Wh ÷ 12.8V ≈ Ah per day.
   
3. Pick a depth of discharge (e.g., 80%).
   
4. Add weather buffer (cloudy days) and inverter losses (~10–15%).
   Result: choose one 310Ah for modest setups; parallel for bigger needs.
   

Installation & Care

• Mounting: Secure against vibration and movement; avoid direct engine-bay heat
  
• Ventilation: No gassing like lead-acid, but allow airflow to keep temps moderate
  
• Charging Temps: Follow BMS guidelines; do not force charge below BMS limits
  
• Storage: Store around 40–60% state of charge in a cool, dry spot if unused for months
  
• Maintenance: None required beyond periodic voltage/SOC checks
  

Specs (Consolidated)

• Chemistry: LiFePO4 (Lithium Iron Phosphate)
  
• Nominal System: 12V (12.8V nominal)
  
• Capacity: 310Ah (~3970Wh)
  
• Battery Properties: Rechargeable; Reusability: Rechargeable
  
• BMS: 100A with low-temperature protection, over-charge/over-heat safeguards
  
• Power Mode: Battery powered (can be charged via solar/DC-DC/AC charger)
  
• Operating Voltage: ≤36V (12V application)
  
• Charging Port/Leads: Standard battery posts (use appropriate lugs/cables)
  
• Rechargeable Battery: Lithium battery — other series (LiFePO4 family)
  
• Brand: HumSienk / HumsiENK
  
• Max/Min Rated Power: Not typically specified at pack level; design loads per BMS current (100A continuous guidance typical)
  

Note: Exact weight, dimensions, and continuous/peak discharge ratings depend on the specific HumSienk HP model revision. If you need cut-sheet values (mm/kg/A), say the word and I’ll include a ready-to-print spec block.

Safety Notes

• Use only LiFePO4-compatible chargers/MPPT profiles (no equalisation mode)
  
• Fuse the positive lead close to the battery; size fuse/cable for your inverter and loads
  
• Avoid deep freezing; BMS low-temp charge cut-off protects cells — don’t bypass
  
• Keep away from flames/sparks; secure terminals against short circuits
  
• For marine installs, follow ABYC-style practices and use tinned marine cable where possible
  

Frequently Asked Questions

Will this replace my AGM/lead-acid one-for-one?
Yes in voltage, but capacity behaves differently. LiFePO4’s usable capacity is far higher at the same Ah rating because voltage stays flatter under load.

Can I start an engine with it?
This is a deep-cycle house/trolling battery, not a dedicated starter battery. Use a separate cranking battery for outboards/vehicles.

How do I charge it from the alternator?
Use a DC-DC charger with LiFePO4 profile to protect both battery and alternator.

Can I wire batteries in parallel?
Yes — use identical models/state of charge and proper bus bars/fusing. For series (24V/36V), check the manufacturer’s approval first.

Is it safe on a yacht?
Yes, when installed with correct fusing, cable sizing, and ventilation. The chemistry is inherently stable and the BMS adds multiple protection layers.

What about winter charging?
The low-temperature protection blocks charging below safe temps. Warm the battery to above the threshold or rely on daytime solar warmth before charging.

Summary

The HumSienk 12V 310Ah LiFePO4 is a powerhouse deep-cycle battery built for New Zealand conditions — huge usable capacity, a 100A BMS with low-temp protection, and chemistry that thrives on daily cycling. From trolling motors and marine house loads to RVs and off-grid cabins, it delivers quiet, clean energy with long service life.