WindyNation BAT-NSAP12-100 Group 31 AGM Deep Cycle Battery

WindyNation BAT-NSAP12-100 is 12V 100Ah Sealed Lead-Acid (SLA) Absorbent Glass Mat (AGM) BCI Group 31 battery, designed for various off-the-grid, float and deep-cycle applications like solar/wind battery, UPS backup battery, security/medical battery, RV house battery, electric trolling motor battery, etc.

Due to its balanced design and features, WindyNation BAT-NSAP12-100 is one of the most popular deep-cycle AGM batteries in its class, offering the users very good performances and affordable price.

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WindyNation BAT-NSAP12-100 Features and Specifications

WindyNation BAT-NSAP12-100 features nominal voltage of 12 volts, nominal (20h) capacity of 106 Ah and 10h capacity of 100 Ah - since it is intended for solar/wind applications and it is expected to provide power during the night for '10 hours', WindyNation BAT-NSAP12-100 is labeled with its actual '10 hours' capacity.

Since the WindyNation BAT-NSAP12-100 is sealed AGM battery, it may be operated in any position except upside down.

Physical dimensions of the WindyNation BAT-NSAP12-100 are (L x W x H) 13.0 x 6.8 x 8.7 inches (33 x 17.3 x 22 cm) and as such, it belongs to the BCI 31 battery group with a maximum allowed battery size of ~13 x 6.8 x 9.44 inches.

WindyNation BAT-NSAP12-100 battery weighs around 67 pounds (~30.4 kg), which is in range with other similar group 31 batteries.

WindyNation BAT-NSAP12-100 internal resistance is ~4.9 mΩ, and although it is not designed as a starting/cranking battery, it is nonetheless able to provide 1200 Amps for 5 seconds.

The manufacturer doesn't state actual Reserve Capacity value, but according to the battery's discharge tables, Reserve Capacity is slightly over 180 minutes (3+ hours). Cold Cranking Amps (CCA) and Marine Cranking Amps (MCA/CA) values are not given - after all, this is NOT starting/cranking battery.

terminal

WindyNation BAT-NSAP12-100 features T11 terminal posts (positive to the left side of the battery).

When the WindyNation BAT-NSAP12-100 battery is being used in standby/float applications (UPS battery, security systems, etc.), its charging voltage should be in the 13.5 - 13.8 volts range, with a temperature coefficient of -20mV/°C.

When the WindyNation BAT-NSAP12-100 battery is used in deep cycle applications (solar/wind off-the-grid applications, electric vehicles, etc.), charging voltage should be in the 14.4 - 15.0 volts range, with a temperature coefficient of -30mV/°C.

Note: Regardless of the actual use, the maximum charging current should be kept below 30 Amps, in order to prolong the battery operating life, avoid overheating, and even gassing. That means that if the battery was discharged below 50% DoD (~53 Ah), it will take at least 2 hours to recharge the battery using 30 Amps charging current.

Personally, don't charge it with 25+ Amps currents - preferably, keep the charging currents below 20 Amps and the battery will last for a long time. Battery features pure lead plates and extra-long float life (10-12 years), so keeping the charging currents in check can achieve really extra long operating life.

WindyNation BAT-NSAP12-100 Discharging Charts

Constant current discharge features of the WindyNation BAT-NSAP12-100 are given in the following chart - values are given in Amps, at 77°F/25°C:

End Battery Voltage End Cell Voltage 10 min 15 min 20 min 30 min 45 min 1 hour 2 hours 3 hours 5 hours 10 hours 20 hours
10.8 1.80 167.6 143.7 123.5 92.1 68.7 55.1 33.1 24.6 17.2 10.0 5.2
10.5 1.75 186.3 154.0 130.8 96.5 71.3 57.1 34.4 25.4 17.6 10.1 5.3
10.2 1.70 199.5 165.1 138.9 101.8 74.6 59.5 35.3 26.0 17.9 10.2 5.3
9.9 1.65 215.1 178.5 146.6 106.7 77.4 61.9 36.3 26.7 18.3 10.3 5.4
9.6 1.60 232.5 188.5 154.3 112.3 80.5 63.8 37.5 27.6 18.6 10.5 5.5

As one can see, WindyNation BAT-NSAP12-100 is able to provide large currents for short periods of time, making it useful even as starting battery for small internal combustion gas engines, commonly found at smaller boats, power generators and similar AND be used as deep cycle battery when the main engine is turned off (as trolling motor battery, as power inverter battery and similar).

But, if possible, use it in two battery electrical systems - crank the engine with smaller cranking/starting battery and use WindyNation BAT-NSAP12-100 as a deep cycle battery.

Constant power discharge features of the WindyNation BAT-NSAP12-100 are given in the following chart - values are given in watts, at 77°F/25°C:

End Battery Voltage End Cell Voltage 10 min 15 min 20 min 30 min 45 min 1 hour 2 hours 3 hours 5 hours 10 hours 20 hours
10.8 1.80 1872.0 1626.0 1410.6 1060.8 796.2 643.2 382.8 286.2 201.6 118.8 61.8
10.5 1.75 2069.4 1732.2 1486.8 1105.8 823.8 664.8 396.0 294.6 205.8 119.4 62.4
10.2 1.70 2199.0 1846.2 1570.8 1161.6 858.0 690.0 405.6 300.6 208.8 120.6 63.0
9.9 1.65 2348.4 1981.2 1647.0 1211.4 886.2 714.6 415.2 307.8 211.8 121.8 63.6
9.6 1.60 2509.2 2070.6 1719.6 1266.6 917.4 734.4 426.6 316.2 215.4 123.0 64.2

As one can see, WindyNation BAT-NSAP12-100 can provide plenty of power for short periods of time, but the best results are achieved when the battery is drained for 2 or more hours - when being discharged for 2 hours down to 10.5 volts, it can provide 396 watts, and when combined with high-efficiency 500W pure sine inverter, it can be used to power a broad range of loads during these 2 hours.

Of course, this is just an example - WindyNation BAT-NSAP12-100 can be connected in series and parallel to increase capacity/voltage of the battery pack and combined with various solar/wind/generator charge controllers and power inverters, and provide power levels as required. windynation bat nsap12 100 2

When the WindyNation BAT-NSAP12-100 battery is being used as a deep cycle battery, the number of charging/discharging cycles depends on the Depth of Discharge (DoD) of each cycle.

On average, WindyNation BAT-NSAP12-100 battery can withstand:

- 30% DoD: ~850 cycles with the capacity loss down to 80% capacity, ~1120 cycles with the capacity loss down to 60% capacity,

- 50% DoD: ~380 cycles with the capacity loss down to 80% capacity, ~460 cycles with the capacity loss down to 60% capacity,

- 100% DoD: ~190 cycles with the capacity loss down to 80% capacity, ~280 cycles with the capacity loss down to 60% capacity.

Obviously, avoiding too many too low DoD discharges can significantly increase the number of charging/discharging cycles.

In order to avoid too deep discharges, it is good to know the actual battery State of Charge (SoC) or Depth of Discharge (DoD) voltage at 77°F/25°C:

State of Charge
(SoC %)
Depth of Discharge
(DoD %)
Open Circuit
Cell Voltage
Open Circuit
Battery Voltage
100 0 2.14 12.84
75 25 2.09 12.54
50 50 2.04 12.24
25 75 1.99 11.94
0 100 1.94 11.64

For example, if the battery is kept at room temperature (77°F, 25°C) and it is NOT discharged below 50% DoD (keeping the battery open-circuit voltage at least 12.24 volts), the battery should withstand ~380 charging/discharging cycles with the capacity loss down to 80% of nominal capacity and ~460 charging/discharging cycles with the capacity loss down to 60% of nominal capacity.

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WindyNation BAT-NSAP12-100 vs. Other BCI Group 31 Batteries

The following cross reference chart lists some of the most popular BCI Group 31 Batteries with their most important features and specifications:

Model Battery Type Cell Type Ah CCA MCA RC Weight (lbs/kg) Review
AIMS Power LFP12V100A Deep Cycle LiFePO4  100 - - ~240 30.2 lbs; 13.7 kg -
Battle Born 100Ah 12V LiFePO4 Deep Cycle LiFePO4 100 - - ~240 29 lbs; 13.2 kg Battle Born 100 Ah 12 V LiFePO4 
Exide XMC-31 Deep Cycle AGM 100 925 1110 200 68 lbs; 31 kg -
ExpertPower EP12100 Deep Cycle LiFePO4  100 - - ~240 29.7 lbs; 13.5 kg -
GreenLiFE Battery GL100 Dual Purpose LiFePO4 100 - - 240 28 lbs; 12.7 kg -
Lifeline GPL-31T Deep Cycle AGM 105 600 750 195 69 lbs;  31.5 kg -
Lifeline GPL-31XT Deep Cycle AGM 125 650 800 230 69 lbs; 31.5 kg -
Lifeline GPL-3100T Dual Purpose AGM 100 810 950 228 67 lbs; 30.4 kg -
NorthStar ELT-AGM31 Dual Purpose AGM 100 925 1050 190 65.7 lbs; 29.8 kg -
NorthStar NSB-AGM31 Dual Purpose AGM 103 1150 1370 220 75 lbs; 34.0 kg -
NorthStar NSB-AGM31M Dual Purpose AGM 103 1150 1370 220 75 lbs; 34.0 kg  -
Odyssey 31M-PC2150 Dual Purpose AGM 100 1150 1370 205 77.8 lbs; 35.3 kg  Odyssey 31M-PC2150 
Optima 8052-161 D31M Dual Purpose AGM 75 900 1125 155 59.8 lbs; 27.1 kg Optima D31M BlueTop 
Renogy RNG-BATT-AGM12-100 Deep Cycle AGM 104 - - 180+ 66 lbs; 29.9 kg Renogy 12V 100Ah Deep Cycle AGM, Gel and Lithium Batteries
Renogy RNG-BATT-GEL12-100 Deep Cycle Gel 100 - - 180+ 60 lbs; 27.2 kg
Renogy RBT100GEL12-G1 Deep Cycle Gel 100 - - ~175 63.9 lbs; 29 kg
Trojan T31-AGM Deep Cycle Gel 102 - - 200 70 lbs; 31.7 kg -
VMAXTANKS SLR125 Deep Cycle AGM 125 - - 260 75 lbs; 34 kg -
VMAXTANKS MR137-120 Deep Cycle AGM 120 - 900 230 75 lbs; 34 kg -
VMAXTANKS VPG12C-100LFP Deep Cycle LiFePO4 100 - - ~240 26.4 lbs; ~12.0 kg -
VMAXTANKS XTR31-135 Deep Cycle AGM 135 730 920 265 77 lbs; 34.9 kg -
XS Power XP3000 Deep Cycle AGM 120 - - 240 73 lbs;  33.1 kg -
Weize 12V 100Ah AGM Deep Cycle AGM 100 - - - 60 pounds; 27.2 kg Weize 12V 100Ah AGM and Gel Batteries  
Weize 12V 100Ah Gel Deep Cycle Gel 100 - - <180 67 pounds; 30.4 kg
WindyNation BAT-NSAP12-100 Deep Cycle AGM 106 - - 180+ 67 lbs; 30.4 kg WindyNation BAT-NSAP12-100 Battery

WindyNation BAT-NSAP12-100 is a performance-wise mid-range group 31 battery. But, it is a reliable battery, tested in various real-life situations by many users.


windynation bat nsap12 100 mLong Story Short: If you are looking for well balanced deep cycle BCI Group 31 battery, consider WindyNation BAT-NSAP12-100 battery.

Although it features very low internal resistance and is able to provide 1200 Amps for 5 seconds, it is a true deep-cycle battery used for various cyclic and float applications.

As such, it is one of the most popular Group 31 deep cycle batteries.

For more reviews and recommendations, feel free to check WindyNation BAT-NSAP12-100 Deep Cycle AGM Battery Amazon link (link opens in the new window).