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Trojan SIND 04 1685

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DISCONTINUED: Trojan SIND 04 1685 4V deep-cycle flooded lead-acid, industrial series, 1293Ah/20h capacity, solar industrial series, double L terminals, 3 + 7 years warranty

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SKU: TRJ-183-119 Category: Tags: ,

Trojan is a well-known and trusted brand for renewable energy batteries. Their L16’s were and are the battery of choice, right from the start when people moved off-grid in the 1960’s. The SIND (Solar INDustrial) line is designed for a 17- to 20-year battery life, Trojan Battery’s Solar Series line of flooded, deep-cycle batteries is specifically engineered to withstand the rigorous conditions of deep-cycle renewable energy applications.

Deep-cycle batteries used in off-grid and unstable grid applications are heavily cycled at partial state of charge (PSOC). Operating at PSOC on a regular basis can quickly diminish the overall life of a battery, which results in frequent and costly battery replacements. To address the impact of PSOC on deep-cycle batteries in renewable energy (RE), inverter backup and telecom applications, Trojan Battery has now included Smart Carbon™ as a standard feature in its Solar Industrial and Solar Premium flooded battery lines.

The Trojan SIND 04 1685 is a direct replacement for their IND23-4V battery.

Recommended Charge Settings (at 25C)

Charge State 12 Volt 24 Volt 48 Volt
Bulk 14.8 Volt 29.6 Volt 59.2 Volt
Absorb 14.4 Volt 28.8 Volt 56.8 Volt
Float 13.5 Volt 27.0 Volt 54.0 Volt
Equalize 16.2 Volt 31.6 Volt 63.2 Volt
Temperature Compensation: -5 mV/°C/cell


Equalize time: 2.5 hours, add distilled water as-needed halfway through

Absorb time: 0.42 x C / I, where C is the 20-hour battery bank capacity and I is the real-world charge current

For example, a 24 Volt bank of six SIND 04 1685 batteries, an 1293 Ah battery bank, with 6,000 Watt in solar PV would have a realistic charge current of around 175 Amp in full sun. That makes for an absorb time of 0.42 x 1293 / 175 = 3.1 hours = 3 hours 6 minutes

Maximum charge current: 15% of 20-hour battery bank capacity (ie. 0.15 x 1293 = 194A for a SIND 04 1685 battery for example), never more than 20%

Low-Voltage cut-off: 11.1 / 22.2 / 44.3 Volt (corresponds to about 80% Depth-Of-Discharge)


  • Built for very long battery life!
  • Smart Carbon for improved performance
  • DuraGrid design provides a thick grid structure that resists corrosion and increases overall battery life
  • Maxguard XL Separator provides even greater resistance to stratification
  • The ultra-rugged Polyon container protects against damage caused by harsh environmental conditions



Mnfr. model

Battery type

Battery Voltage

Amp-hours (20-hour)







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