MWM Solar and Electronics Multan

⚡ TOMZN SOLAR BREAKERS – COMPLETE RANGE AVAILABLE ⚡

Looking for reliable AC & DC protection devices for your Solar System? ☀️🔋

MWM SOLAR MULTAN offers a wide range of TOMZN Solar Protection & Switching Products for residential, commercial and industrial solar installations.

🔌 TOMZN AC BREAKERS
✅ AC Circuit Breakers
✅ Reliable overload & short-circuit protection
✅ Suitable for solar and electrical distribution systems

☀️ TOMZN DC SOLAR BREAKERS
✅ DC MCB / DC Protection
✅ Designed for Solar PV applications
✅ Helps protect PV circuits from overcurrent & faults

🔄 TOMZN CHANGEOVER SWITCHES
✅ Manual Changeover Breakers
✅ Easy switching between Power Sources
✅ Suitable for Solar + WAPDA + Generator systems

🔀 TOMZN MTS CHANGEOVER
✅ MTS (Manual Transfer Switch)
✅ Reliable source transfer
✅ Ideal for backup power, solar and generator applications

🏠 Suitable For:
Solar Systems | Homes | Shops | Offices | Commercial Buildings | Solar Installers | Electricians | Industrial Applications

📍 AVAILABLE AT:
MWM SOLAR AND ELECTRONICS MULTAN
📌 Address: Multan, Punjab, Pakistan
📞 Contact: 0308-8800020

👉 For TOMZN AC Breakers, DC Solar Breakers, Changeover & MTS Changeover, contact MWM SOLAR MULTAN.

⚠️ Choose the right protection for your solar system — proper breaker selection and installation matter.

Depth of Discharge (DoD) has a major effect on lithium battery cycle life, but the relationship is not linear.
A battery used at 50% DoD generally experiences much less electrochemical stress than the same battery repeatedly taken to 100% DoD.

Example: Battery rated at 8,000 cycles @ 50% DoD

If the manufacturer's 8,000-cycle rating is specifically at 50% DoD, we can use a nonlinear relationship as an illustrative estimate for other DoD levels. A published lithium-ion model gives a power-law relationship between DoD and cycle count.

DoD Battery Used Each Cycle Approx. Cycle Life* Relative to 50% DoD

100% 100% capacity ≈ 3,330 cycles 42%
90% 90% capacity ≈ 3,810 cycles 48%
80% 80% capacity ≈ 4,420 cycles 55%
70% 70% capacity ≈ 5,230 cycles 65%
60% 60% capacity ≈ 6,350 cycles 79%
50% 50% capacity 8,000 cycles 100%

*These are mathematical estimates, not manufacturer specifications. Actual cycle life depends heavily on battery chemistry, cell quality, temperature, charging/discharging current, upper/lower voltage limits, BMS settings and the manufacturer's defined end-of-life (e.g. 80% or 70% remaining capacity).

What this means in practice

For example, with a 10 kWh LiFePO₄ battery:

100% DoD: use the full 10 kWh → deeper stress

80% DoD: use 8 kWh

60% DoD: use 6 kWh

50% DoD: use 5 kWh → considerably gentler cycling

Importantly, 8,000 cycles at 50% DoD does NOT mean the battery will necessarily give 16,000 cycles at 25% DoD, because DoD/cycle-life behavior is nonlinear. Real LFP batteries also vary considerably between manufacturers and test conditions.

The other factors that affect those 8,000 cycles

1. DoD — deeper discharge generally reduces cycle life.

2. Temperature — high temperature accelerates degradation.

3. Charge voltage / SoC — keeping lithium cells at very high SoC for long periods can accelerate ageing.

4. Charge/discharge current (C-rate) — high current increases stress and heat.

5. Cell chemistry — LFP, NMC, etc. behave differently.

6. BMS protection — over-charge, over-discharge and temperature protection are critical.

7. Cycle definition — always check whether "8,000 cycles" means 80% SOH, 70% SOH, etc. This is essential when comparing batteries.

For solar storage, 50–80% DoD is often a sensible operating window when longevity is the priority, but the battery manufacturer's specified operating limits should take precedence.