Table of Contents

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Assumptions

18650 Battery Assumptions

Specification	Value
Nominal Voltage	3.7v
Max Voltage	4.2v
Cutoff Voltage	3.0v
Capacity	2500mAh

Configuration Options

This section will look at the pros and cons of a 3S versus 4S configuration.

3S (9V-12.6V)

Specification	Value
Nominal Voltage (3 x 3.7v)	11.1v
Max Voltage (3 x 4.2v)	12.6
Min Voltage (3 x 3.0v)	9v
Cells in Series for Voltage	3

Pros:

Can charge it from the car
Works with most chargers (solar and car chargers)

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Would not get full capacity when using with an inverter. The inverter would shut off at 10.5v.

4S (12V-16.8V)

Specification	Value
Nominal Voltage (4 x 3.7v)	14.8v
Max Voltage (4 x 4.2v)	16.8v
Min Voltage (4 x 3.0v)	12.0v
Cells in Series for Voltage	4

Pros:

Would be able to use the full capacity of the battery when converting to AC.

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Would need to step down the voltage to 12v which may introduce some losses.
Could not charge it off of the car

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Configuration

Battery Spec

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3S56P - (

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130 Ah)

Specification	Value
Nominal Voltage (3 x 3.7v)	11.1v
Max Voltage (3 x 4.2v)	12.6
Min Voltage (3 x 3.0v)	9v
Cells in Series for Voltage	3
Parallel Cells to Get Capacity 80Ah/2.0Ah	3256
Total Cells Required	96168

Specification	Details
Capacity

64

112-

73

128.

6

8 Ah
Cell Capacity	2.0-2.3 Ah
Cells

3x32

3x56=

96 cells

If we build 2 of these and connect them together we get

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168 cells

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Battery Capacities and Pack Configurations

https://docs.google.com/spreadsheets/d/1mlgodp0UQAi1QGu0aGxJdH-wnCkg5dZosCjmBs_kSDo/edit#gid=0

Rpackr Configuration:

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The Plano 50 Cal Ammo Box will can hold 2 of these packs for a total of 150Ah ( 192 cells (about 150Ah).

Battery Management System

50A BMS

3Series 50A 11.1V/12V/12.6V BMS PCB Protection Board for 18650 3S 100A Li-ion Lithium 18650 BMS Battery Charger Protection Board Battery Cell with Balance

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Features
Continuous Discharge Current: 50A Momentary Discharge Current: 150A Charge Voltage:

FeatureDetailsLarge discharge current100AInstantaneous discharge current150ACharging voltage

12.6V

Large charge current10AOvercharge detection voltage

Charge Current: 50A
Overcharge Detection Voltage: 4.28±0.

05V

025V
Overcharge

protection delay

Protection Delay: 0.5S
Overcharge

release voltage

Cancel Voltage: 4.08±0.1V

Power balance detection voltage

Balance Detection Voltage: 4.20±0.

05VPower balance release voltage

025V
Balance Cancel Voltage: 4.20±0.05V

Electricity balance current42±5mA

Balance Current: 60±5mA
Over

discharge detection voltage

-discharge Detection Voltage: 2.8±0.1V

Overdischarge detection delay

Over-discharge Detection Delay: 0.1S
Over

discharge release voltage

-discharge Cancel Voltage: 3.0±0.1V
Overcurrent

detection voltage

Detection Voltage: 150mV
Overcurrent

detection delay

Detection Delay: 9mS
Overcurrent

protection current200±10AOvercurrent protection release conditionDisconnect the loadShort circuit protection conditionsExternal load short circuitShort circuit detection delay250uSMain circuit conduction resistance≤25mΩWorking current≤20uASleep current (when battery is over)≤10uASize8.2x5.1cm/3.23x2.01inch

Test Results of Batteries

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Protection Current: 200±10A
Protection Cancel Condition: Disconnect Load
Short Circuit Protection Condition: Outside Load Short Circuit
Short Circuit Detection Delay: 250uS
Protection Cancel Condition: Disconnect Load
Main Circuit Conduction Internal Resistance: ≤25mΩ
Working Current: ≤30uA
Sleeping Current(Battery Over-discharge): ≤10uA
Operating Temperature:﹣30℃~﹢80℃
Size: 75×51.5×15mm/2.95×2.02×0.59"

100A BMS

3Series 50A 11.1V/12V/12.6V BMS PCB Protection Board for 18650 Li-ion Battery Cell with Balance

Battery Hookup Modem Batteries

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We spot tested tens of thousands of these cells and they came out around full capacity overall. These are a great source of genuine LG 2200mah cells because the modem batteries are either never used at all or they were used as backup only with less than 3 cycles. Modem batteries only gets cycled hen a house loses power which is very rare in our region.

Brand:	LG
Model:	LGDAS31865 (ICR18650S3)
Capacity:	2200mAh Rated
Voltage:	3.60V Nominal
Charging:	4.20V Maximum 1075mA Standard 2150mA Maximum
Discharging:	3.00V Cutoff 430mA Standard 3225mA Maximum
Description:	Blue Cell Wrapper White Insulator Ring 18650 Form Factor

Almost every pack we opened had the light blue lg cells, some had dark blue lg cells with the same specs. Either way they are all name brand cells, the best ones out there

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