6 Associated Systems
6.1 Introduction
This chapter briefly describes how the eSite Modular interacts with the associated systems on site.
6.2 Battery
eSite Modular can operate with lead-acid or lithium-ion batteries. Several different brands and models of both lead-acid and lithium-ion batteries are pre-configured to simplify installation and long lifespan. Battery parameters can be customized on site or remotely.
eSite Modular supports three battery charge strategies to optimize the use of the battery bank used on site.
Voltage control
Used with a basic battery bank. The use of batteries is not optimized. Charging start and stops at specified voltage levels. The life-time of the battery bank is relatively short.
Static state of charge (SSOC)
Used with battery bank delivered with proper data. Static state of charge gives a good estimation of battery life-time. Charging start and stops at specified SOC levels. A method convenient for a very remote site were it takes a great effort to switch battery bank.
Partial state of charge (PSOC)
Used with battery bank delivered with proper data. Partial state of charge saves fuel costs and is the most cost saving strategy. Charging start at dynamically adjusted SOC levels and stops when charge current falls below a specified value. The life-time of the battery bank may be shorter than if Static state of charge is used.
The following batteries are available to select in the local web page. Contact eSite Power Systems for creation of other battery types configurations.
Lead-Acid batteries
Amaron Volt 400Ah
Amaron Volt 600Ah
Amaron Volt 800Ah
Sacred Sun GFMJ-800H
Sacred Sun GFMJ-1000H
Sacred Sun GFMJ-1200H
FAG12 6x200Ah
Leoch LPF12 600Ah
EnerSYS SBS Eon 3x170Ah
EnerSYS SBS Eon Dual Bank 6x170Ah
EnerSYS SBS Eon 2x190Ah
EnerSYS SBS Eon 4x190Ah
EnerSYS SBS Eon Dual Bank 8x190Ah
EnerSYS Power Safe TS 1260Ah
EnerSYS Power Safe TS Dual Bank 1260Ah
EnerSYS Power Safe TS 900Ah
EnerSYS Power Safe TS Dual Bank 900Ah
Lithium-ion batteries
Lion - Vision LFP 48V 100Ah
Lion - LG Chem 48V 126Ah
Lion - LG Chem 48V 60Ah
Polarium - SB48 Generic
Shoto - 100 Ah
Sacred Sun 100 Ah
6.3 Solar
A solar array consists of one or many photovoltaic cells. Solar panels connected together in series are known as a solar string. Typically, an array consist of a number of strings connected in parallel.
Caution
Solar panels with built-in electronics must not be connected to eSite Modular solar converters. Contact eSite Power Systems for further information.
One solar array with a maximum capacity of 2.2 kW can be used with each eSite Modular solar converter. The solar converters are designed for use with monocrystalline and polycrystalline solar panels with 72 cells and 6 inch wafers. Solar panels with 60 cells can be used but the configuration of the array will not be optimal.
Caution
Open circuit voltage of each string of solar panels must never exceed 140 V.
Note
The total solar current output will never exceed 20 A per solar converter. Solar arrays of higher capacity will not damage the system if connected, but they will not provide any extra power.
Example configuration for solar array with 72 cell solar panels:
STC power rating: 320 W
Open circuit voltage: 46 V
Maximum power current: 8.64 A
Three panels in series: 138 Voc
Two solar panel strings power output: 23315 = 1 920 W at STC
Example configuration for solar array with 60 cell solar panels:
STC power rating: 270 W
Open circuit voltage: 38.39 V
Maximum power current 8.8 A
Three panels in series: 115.57 Voc
Two solar panel strings power output: 1 620 W at STC
Adding a fourth panel in series is not possible as the open circuit voltage will exceed 140 V. A third solar panel string can be added but only a maximum current output of 20 A can be used.
6.4 Genset
Gensets with three-phase or one-phase power can be used with eSite Modular. Two gensets can be connected and controlled.
The maximum power drawn from each genset can be configured to prevent small gensets to be overloaded. Information from the genset control panel(s) can be sent to the eSite RMC either by dry contact or with direct Modbus communication. The genset(s) are automatically started by eSite RMC. Solar and grid power always have priority over genset and are considered as most optimal power sources.
6.5 Grid
The maximum current drawn from grid can be configured to allow sites with different sized grid fuses. The eSite Modular system constantly monitors the grid voltage and frequency to determine when sufficient power is available. With the built-in SCR functionality, the eSite Modular system maximizes the use of grid with seamless power transfer, shutting down any connected genset when grid is available.
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