eBoost Battery - Inverter Integration Guide

eBoost Battery - Inverter Integration Guide


Important notice
This Quick Guide does not exempt the installer or User from reading each product manual. Failure to do so may risk damaging both Fortress Power equipment and other manufacturers and void warranty.

Abbreviations


Connection diagrams
Connection Overview


One eBoost Battery and Envy Inverter Electrical Connection Overview
When operating with one eWay, keep the terminator plug placed in its original position. 
Plug one side of the BAT-PCS cable into the RJ45 ports of the Communication board and the other side into the inverter BAT COM port. RSD features include complete system shut off by disconnecting the batteries voltage output, Disabling PV Voltage, and Load Output per NEC 2023 Code. To achieve this, Follow the connections in the above image.

Two or more eBoost Batteries and Envy Inverter Electrical Connection Overview
Remove the terminator from the first eWay and place battery to battery communication.
Make sure that the secondary eWay keeps the terminator connected in its original port. Repeat this process with batteries connected in parallel by connecting the Battery -Battery RJ45 Cables in daisy chain sequence starting with the first battery to the last. Place the Resistive RJ45 plug into the terminator Port of the last secondary battery following chronological sequence starting with the Primary Battery. Lastly, plug the ‘RACK1-RACK2 ENABLE “cable from the primary battery to the secondary.
For More details of parameter settings, please refer to the Fortress Power Envy 12kW/10kW/8kW Manual.

Fortress Power Envy Integration
      Closed loop and pinout definitions

COMMISSIONING
      For Commissioning batteries where multiple eWay are in parallel, please go to the “Commissioning in Parallel” section.
      1. Turn the battery breaker inside the inverter. See below.
      2. Turn the RSD Switch to the ON position.
      3. Press the Power button. Make sure to select the correct inverter protocol by holding the power button for 5 seconds after initiating the battery. 
      4. Verify Voltage by applying a voltmeter at the eWay internal busbar. Voltage should be around 49-52.5V
      5. Inverter Communication Protocol
To select the inverter protocol to achieve closed loop communication, you must press and hold the power button for 5 seconds, then release it. Immediately the LED 6&7 will start flashing following the current inverter protocol status. In this stage, press the button once until you select the correct protocol as shown in the images below.
Fortress Power Envy
Before setting the parameters, make sure the system is in Standby. Make sure to press SET for each setup. Confirm the battery is doing Closed Loop Communications with the Primary inverter under the Battery of the Data Section.

Battery Set Up

Battery Capacity: 314ah per battery
Discharge Current: 250A per Battery

Self-Consumption Mode


Back up

Off-grid


Sol-Ark

Share Sol-Ark Monitoring w/Fortress
Set up Wi-Fi with Sol-Ark Inverter using Sol-Ark’s My Sol-Ark App and have your site name and Wi-Fi dongle serial number handy to register the system online with Sol-Ark. After registering, use a laptop to log into MySolArk via a web browser at http://mysolark.com
Note: For certain circumstances, temporarily use the batteries in open-loop communication mode, please follow the following link for open-loop settings: 

Programming:
      1. To program the inverter using the Sol-Ark inverter screen, go to battery setup menu:
      2. Program the 'Batt' tab first. Enter the settings as shown below and tap on 'OK' at the bottom of the menu afterwards:
            Closed Loop Settings

Confirm closed loop communication was established by going to the Home screen and selecting Li-BATT INFO.


Note: 
a) If closed loop communication is set up correctly, enabling 'BMS Lithium Batt 00' will adjust some values automatically. In this tab, those would be 'Batt Capacity' and 'Tempco'.
b) If the total charge/discharge current capacity of the batteries exceeds the inverter's capabilities, use the maximum current settings of the inverter. 
For example, if you have four eBoost and one Sol-Ark 12K inverter, based on the size of the battery bank, 'Max A Charge' and 'Max A discharge' should be 250A each. But Sol-Ark 12K can only carry 185A DC going to or coming from the battery. So, in this case, both 'Max A Charge' and 'Max A Discharge' would be set to 185A.
c) If recovering a deeply discharged battery, adjust the above charge amps to 10A.

      3. Next, program the 'Charge' tab in the 'Battery Setup' menu:

Note:
a) The settings shown in the latter screenshot are the most conventional ones, hence, adjustments may be required (please see the table below).
The approach described in the note "2b" applies while programing this tab as well. Additionally, current set point (A) must not exceed the generators’ capability.

Grid-tied
Portable Generator
Stationary Generator
Gen Charge
Grid Charge
Time of Use
Y
NNuncheck
15%
20%
YYN
10%
15%
20%
N
YN
20%
uncheck
n/a
NNY
uncheck
20%
n/a
NYY
10%
20%
n/a
b) Larger generators are commonly tied into the grid side of the inverter rather than the dedicated generator input. Make check-marks and current adjustments accordingly. This fact was kept in mind while creating the last two rows of the table above.
c) Fortress batteries may be discharged to their full rated capacity without voiding the warranty, but for best overall experience and battery life, limit the discharge to 80% except for very rare occasions. Here is a list of our suggested triggers:
d) It is acceptable to raise the grid or generator start triggers to increase the reserve capacity of the system.

      4. Program the Discharge tab:


Note:
a) At 'Shutdown' state of charge (battery bank charge percentage), inverter prevents battery from powering the loads. The battery(s) will renew/continue providing power to the loads when the battery bank is recharged to 'Restart' state of charge. 'Shutdown' and 'Restart' state of charge set-points can be increased to increase the "reserve capacity" of the system, but that will cause less battery charge usage. The correct shutdown level is specific to the project site.
b) Low battery is an alarm also specific to the project site, integrated with the Sol-Ark monitoring app. We suggest a 20% state of charge as a low battery alarm level. But it is a good idea to increase it if the 'Shutdown' and 'Restart' set-points are increased.
c) The battery empty voltage should not be lower than 48V. The last statement from the previous note applies to the 'Batt Empty V'. Usually this set-point does not exceed 50V


Grid Setup / Time-of-Use
Time-of-use settings are specific to each end user but also important to having system behavior meeting customer expectations. system to behave as the end user wants it to behave.  There are a few important things to know when programming Sol-Ark's time-of-use settings:

  1. Checking the "charge" column boxes will force a grid charge to that battery. 
  2. Leaving the "charge" column boxes unchecked will act as a low battery cut-off. 
  3. Enabling "grid-sell" will allow the battery to sell back to the grid when it is otherwise 100% full.
  4. Solar will charge the battery to 100% if there is enough sunlight available and all the loads are otherwise met. 
  5. Additional settings worth exploring in the Grid Setup Menu are the frequency ranges and grid profile settings useful for generator compatibility. 
Back-up Only Customers:
Batteries work better and last longer if they are used, rather than staying 100% full. Our recommendation is to allow the battery to drop to 70% during the early morning hours and then have it go to 100% during the day. You do not need to enable a grid-charge for this functionality. You may want to increase the grid start % or voltage in the battery setup menu.

Time-of-use Customers:
  1. To maintain solar tax credit compliance, you will want to prioritize battery charging in the hours before the time-of-use period so that the battery is 100% going into the time frame. 
  2. You may also want to enable a grid charge the hour before the time-of-use period to ensure the battery reaches 100%
  3. You may not want to discharge the battery too aggressively. Sticking to no more than 9kW per eVault or 3.3kW per eBoost is optimal for maximizing battery life under time-of-use grid sell-back. Likewise, selling back at less than the full rated value of the inverter is healthy for inverter life. So for example, if you can identify that the battery and inverter will be fully utilized over the time of use rate period by discharging at 5kW rate instead of the full rated capacity of the inverter, it will extend battery life.
  4. That said, the mantra is "use it or lose it" - it is more economically advantageous for the end user to use the battery when it is financially advantageous to do so, rather than to keep the battery at 100% always.
Bad Utility Buyback Rates aka "no net-metering" aka "bad net-metering":
Allow the battery to discharge to a 20% state-of-charge overnight, so that it can absorb as much solar power as possible during the day rather than having that energy sold back to the grid.  Staggering the step down percentages throughout the night so that the battery so that the battery hits 20% right in the early morning will mitigate the risk of power outage between sun up and sun down. Maintain the final 20% time-of-use step with a grid charge to make sure the battery does not go below 20% (which would trigger a full grid recharge at 15% per prior steps).  During the day, it does not matter if you prioritize the grid or the battery first when recharging with solar power.

Note: Change the programming from Percentage to Voltage in the Battery setup menu. (Use Batt % Charge / Use Batt  V charge)

Here are more aggressive settings for minimizing sell-back to the grid (but allowing grid-sellback when the batteries are full).


Solo 6.5

Physical Button

LED Indicator


Physical Button
Description
Indicator
Color
Description

Enter/Exit the setup menu
AC/INV
GREEN
Normally ON: Grid 
bypass output 

Go to the next option
Flash: inverter output 

Go to the previous option
CHARGE
YELLOW
Normally ON: charging
 completed 

Confirm/Enter the option in setup menu
Flash: charging

FAULT
RED
Normally ON: level 1 fault 

Flash: level 2 fault 

OFF: level 3 or level 4 fault 

ICON
DESCRIPTION
ICON
DESCRIPTION

PV Panel

Grid

Battery

Generator

The inverter is working 

Load

The inverter is communicating with the data collector

The buzzer is in mute mode

Power flow direction

The inverter is in standby mode

The inverter is working normally

There is a fault

Settings

Load power: 80%−100%

SOC: 80%−100%

Load power: 60%−79%

SOC: 60%−79%

Load power: 40%−59%

SOC: 40%−59%

Load power: 20%−39%

SOC: 20%−39%

Load power: 5%−19%

SOC: 5%−19%

Battery under-voltage

Battery over-discharge

Overload

BMS Fault

System communication error

System undervoltage

System overvoltage

System under temperature

System overtemperature

System overcurrent

Battery full power

User-defined battery

Sealed lead-acid battery

Flooded lead-acid battery

Gel lead-acid battery

Ternary Li-ion battery

LFP Li-ion battery
ECO
Energy-saving mode
PVLOAD
PV power is loading
PVCHG
PV power is charging the battery
ACCHG
AC input power is charging the battery
GRID
FIRST
The output mode of the inverter is Grid first
BYPASS
The output mode of the inverter is Grid bypass
SOLAR
FIRST
The output mode of the inverter is PV first
BATT
FIRST
The output mode of the inverter is battery first



Real-time parameters view 
On the screen, press the UP/DOWN button to view real-time data of the inverter in operation 
PAGE
PV
BATTERY
AC INPUT
LOAD
GENERAL
1
PV input voltage
Battery voltage
Grid input Voltage
Single-phase voltage
Current time
2
PV input current
Battery current
Grid input current
Single-phase current
Current date
3
PV input power
Battery voltage
Grid total input power
Single-phase active power
PV gross generation
4
PV generation for the day
Battery current
Grid charging capacity for the day
Single-phase apparent power
Total load consumption
5
PV heat sink temperature
Heat sink temperature
Grid frequency
Inverter output frequency
RS485 address
6
Rated open circuit voltage
Rated battery voltage
Bus voltage
Rated output frequency
Software version
7
Maximum PV charge current
Maximum battery charges current
Maximum Grid charge current
Total output active power
/
8


/
Total output apparent frequency
/

Settings


NOTICE
If you use lithium battery which has communication with Inverter, please skip all Battery Voltage setting (04~07)

INVERTER MODE OF OPERATION DESCRIPTION
00
Exit
ESC
Exit the setup Menu
01
ESS Operation mode
UTI (Default)
Backup Mode
Backup Mode (Load Source Priority: PV → Grid → Battery)  
SBU  
Self-Consumption 
Mode (Recommend) 
Self-Consumption Mode (Load Source Priority: PV → Battery → Grid) 
 
PV Power Priority – The system first uses solar (PV) power to supply the load. 
Battery Backup – If PV power is insufficient, the system draws power from the battery to support the load. 
Grid as Last Resort – The system switches to grid power only when the battery voltage drops below the set threshold (Parameter ④). 
Return to PV/Battery – Once the battery voltage recovers above the set threshold (Parameter ⑤), the system switches back to PV or battery power for load supply. 
SOL
Self-Consumption Mode (Load Source Priority: PV → Battery → Grid) 
The PV mode is to be applied first and when the PV power is unavailable or the battery voltage is lower than the set value in the item 4, it will switch to the Grid mode
SUB 
Battery  
Charging Priority Mode
PV and Grid prioritize Charging the Battery 
 
PV Priority for Charging – The system prioritizes PV power to charge the battery. 
Grid-Assisted Charging – If PV power is insufficient, the system uses both PV and grid power for charging (except when Parameter 06 is set to PV-only charging, in which case the grid will not charge the battery). 
Grid Powers the Load – While the battery is charging, the grid supplies power to the load when PV alone is not sufficient. 
Hybrid Load Supply – If PV power is enough for charging but insufficient for the load, the system will use both PV and grid power to support the load. 
Battery Discharges Only in Off-Grid Mode – The battery does not discharge when the system is connected to the grid; it is reserved for off-grid operation only. 

FN
PARAMETER
EBOOST
04
Battery Low Cut of Voltage
51.2V
WHEN PARAMETER ITEM 01 IS SET TO SBU (SOLAR-BATTERY UTILITY) OR SOL (SOLAR ONLY) MODE, THE SYSTEM PRIORITIZES PV AND BATTERY POWER. HOWEVER, IF THE BATTERY VOLTAGE DROPS BELOW THE SET CUT-OFF POINT, THE POWER SOURCE AUTOMATICALLY SWITCHES FROM THE INVERTER TO THE GRID TO PREVENT BATTERY OVER-DISCHARGE
06
Grid Charge Setting
SNU (RECOMMENDED)
SNU (DEFAULT): BOTH PV AND GRID CAN CHARGE THE BATTERY, WITH PV AS THE PRIORITY CHARGING SOURCE 
OSO: GRID POWER WILL NOT CHARGE BATTERY
07
Battery Charge Current
180Adc per eBoost
08
Battery Type
L16
09
Battery boost 
charge voltage (Bulk & Absorption)
55.2V
10
Boost Charge duration
60min
11
Battery floating
charge voltage 
54V
12
Battery over-discharge Protection voltage 
(delayed shutdown)
48V
13
Battery over-discharge delay time
50s
WHEN THE BATTERY VOLTAGE DROPS BELOW THE THRESHOLD SET IN PARAMETER ITEM 12, THE INVERTER WILL WAIT FOR THE DELAY TIME SET IN THIS PARAMETER BEFORE SHUTTING OFF THE OUTPUT. 
SETTING RANGE: 5S – 50S 
ADJUSTMENT STEP: 5S 
PURPOSE: THIS DELAY PREVENTS UNNECESSARY SHUTDOWNS DUE TO TEMPORARY VOLTAGE DIPS, ENSURING STABLE SYSTEM OPERATION WHILE STILL PROTECTING THE BATTERY FROM OVER-DISCHARGE
14
Battery under-voltage alarm threshold
51.2
WHEN THE BATTERY VOLTAGE IS LOWER THAN THE THRESHOLD, IT WILL GIVE AN UNDER-VOLTAGE ALARM AND THE OUTPUT WILL NOT SHUT DOWN. SETTING RANGE: 40 V−52 V, WITH A STEP OF 0.4 V
15
Battery over discharge protection voltage
48
16
Battery equalization charge
DIS (Default)
DIS: DISABLE EQUALIZATION CHARGE 
ENA: ENABLE EQUALIZATION CHARGE, ONLY AVAILABLE FOR FLOODED LEAD-ACID BATTERIES, SEALED LEAD-ACID BATTERIES, AND USER-DEFINED ONES
32
RS485 Communication Function
CAN
33
BMS communication
FOR
35
Battery under-voltage recovery threshold
51.2
37
Battery Recharge Voltage
51.2
39
Charge Current limit (Communicate with BMS)
LCBMS (default)
LCSET: THE MAXIMUM BATTERY CHARGE CURRENT IS NOT GREATER THAN THE SET VALUE OF “07” 
LCBMS (DEFAULT): THE MAXIMUM BATTERY CHARGE CURRENT IS NOT GREATER THAN THE MAXIMUM BMS ALLOWED CURRENT 
LCINV: THE MAXIMUM BATTERY CHARGE CURRENT IS NOT GREATER THAN INVERTER ALLOWED CURRENT
40-45
Start and End Charge time 1,2,3
00:00:00
46
Timed battery charge function
DIS
DIS (DEFAULT): DISABLE THE FUNCTION 
ENA: WHEN THE TIMED GRID CHARGING/LOAD SUPPLY FUNCTION IS ENABLED, THE POWER SUPPLY MODE WILL OPERATE BASED ON THE CONFIGURED TIME PARAMETERS AND BATTERY STATE (RANGE  0:00:00−23:59:00)
1. OPERATING MODES 
SBU MODE ACTIVATION: 
THE SYSTEM WILL OPERATE IN SBU MODE WHEN TIMED GRID CHARGING IS ENABLED. THE INVERTER WILL PRIORITIZE SOLAR (S) AND BATTERY (B) POWER, SUPPLYING LOADS FROM THESE SOURCES. WHEN THE SYSTEM REACHES THE CONFIGURED CHARGING PERIOD OR THE BATTERY ENTERS AN OVER-DISCHARGE STATE, IT WILL SWITCH TO GRID (U) POWER FOR BATTERY CHARGING. 
UTI MODE ACTIVATION (WITH TIMED DISCHARGE ENABLED): IF THE TIMED DISCHARGE FUNCTION IS ALSO ENABLED, THE SYSTEM WILL SWITCH TO UTI MODE. IN THIS MODE, THE INVERTER: USES GRID POWER FOR BATTERY CHARGING ONLY DURING THE SET CHARGING PERIOD. SWITCHES TO BATTERY INVERTER OPERATION DURING THE CONFIGURED DISCHARGE PERIOD OR IF THE GRID POWER IS LOST.
47-52
Start and End discharge time 1,2,3
00:00:00
53
Timed battery discharge function
DIS
DIS (DEFAULT): DISABLE THE FUNCTION 
ENA: AFTER THE TIMED BATTERY DISCHARGE FUNCTION IS ENABLED, THE POWER SUPPLY MODE WILL BE CHANGED INTO UTI, WHERE THE SYSTEM ONLY SWITCHES TO THE POWER SUPPLY OF BATTERY INVERTER DURING THE SET DISCHARGE PERIOD OR GRID FAILURE 
58
SOC setting for discharge alarming
25%
WHEN THE CAPACITY IS LESS THAN THE SET VALUE, THE SOC ALARMS (UNIT: %, ONLY AVAILABLE DURING NORMAL BMS COMMUNICATION)
59
SOC setting for discharge cutoff
20%
WHEN THE CAPACITY IS LESS THAN THE SET VALUE, THE DISCHARGE STOPS (UNIT: %, ONLY AVAILABLE DURING NORMAL BMS COMMUNICATION)
60
SOC setting for charge cutoff
100%
WHEN THE CAPACITY IS GREATER THAN THE SET VALUE, THE CHARGE STOPS (UNIT: %, ONLY VALID DURING NORMAL BMS COMMUNICATION)
61
SOC setting for switching to grid
25%
WHEN THE CAPACITY IS LESS THAN THE SET VALUE, IT SWITCHES TO GRID (UNIT: %, ONLY AVAILABLE DURING NORMAL BMS COMMUNICATION)
62
SOC setting for Switching to inverter Output
100
WHEN THE CAPACITY IS GREATER THAN THE SET VALUE, IT SWITCHES TO THE INVERTER OUTPUT MODE (UNIT: %, ONLY AVAILABLE DURING NORMAL BMS COMMUNICATION)
73
Max charging current by generator
90Adc


Schneider
Note: Master battery will not have frames 6&7 ON even when successfully connected.
      1. Make sure your Insight home has firmware v1.17
      2. Make sure that Insight Home is reading the battery internal parameters.
      3. Associate Battery as House Battery Bank 1


Parameter Settings

PARAMETER
VALUE
CHARGER SETTINGS
RECHARGE VOLTAGE
51.2V
RECHARGE SOC
20%
RECHARGE DELAY
60S
BATTERY SETTINGS
BATTERY TYPE
LI-ION
CHARGE CYCLE
EXTERNAL BMS
SOC CONTROL ENABLE
ENABLED
BATTERY BANK CAPACITY
314aH per eBoost
Maximum Charge Rate 
100%
Maximum Bulk Charge Current
180A per eBoost
maximum absorption charge current
180A per eBoost
Maximum Float Charge
180A per eBoost
Default Battery Temperature
WARM
Absorption TIme
3600
Bulk/Boost VOltage
55.2V
Absorption Voltage set Point
55.2V
Maximum Discharge Current
250A per eBoost
Maximum Discharge Time Interval
8s
low Battery Cut Out
48V
low Battery Cut Out Delay
10s
low Battery Cut Out hysteresis
2
low Battery Cut Out warning offset
2
high Battery Cut Out
58V
CHARGE CYCLE TIMEOUT
1440s
high SOC COT OUT
99%
high SOC COT OUT delay
2s
low SOC COT OUT
15%
low SOC COT OUT delay
60s


Victron
Setup steps

Outback inverter integration guide
Share Your OpticsRE online monitoring with Fortress Power. Sharing OpticsRE with Fortress Power
Log into OpticsRE and Click on “My Profiles” in the side menu. Click on the Gear icon next to the site name
Picture 1901356928, Picture
Add “techsupport@fortresspower.com as an Admin profile.
Picture 911739296, Picture

Unpack batteries and check voltage
  1. Unpack the batteries and turn each battery on by itself. 
  2. Note the voltage of each battery and serial number. The serial numbers are useful during warranty submittal.
  3. The batteries must be within +/-0.5V of each other before commissioning. Groups of 4 batteries or more may require a narrower voltage range to commission properly.
  4. Turn off the batteries and install them in parallel.
Notes  If the battery voltages are significantly different, one technique is to finish battery installation and only turn on the lowest voltage battery using the push button. Charge the battery, and when the charging voltage is ~0.2V above the resting voltage of the next lowest battery, turn it on too. Proceed until all batteries are turned on and at the same voltage level. If the batteries are below 51V, keep charging amperages below 10A per battery. If the batteries are slightly more than +/-0.5V from each other, turning on the highest voltage batteries will only reduce their voltages, and turning on the lowest voltage batteries will only lower the highest voltage. Likewise, turning on the lowest voltage batteries as a group will raise the lowest voltage. Then, all the batteries can be turned on within a 0.5/V difference.  Use of the Fortress firmware update tool can help speed up commissioning times. Fortress installers should request a firmware update tool by filling out a support ticket at https://support.fortresspower.com 
Radian Inverter Settings 
Inverter
80% DoD, 6000 cycle
Absorb Voltage and  Time
55.2 Vdc/ 2.0hr  
Float Voltage and Time
54.4 Vdc / 0.0 hr  
*only float with w/inverter if charge controllers unavailable  
Re-float Voltage 
52.4 Vdc  
*Increase by 1V if charge controllers unavailable  
Re-Bulk Voltage 
51.2 Vdc  
*Increase by 1V if charge controllers unavailable  
AC Input Mode  
Grid Tied (default, adjust as needed)  
AC Charger Limit in AC 
eBoost:180Aac per battery 
Low Battery Cut- Out Voltage 
51V *user adjustable  
LBCO Delay 
130 seconds *user adjustable
Low Battery Cut-in Voltage 
51.8 *user adjustable 
High Battery Cut-Out Voltage 
56V 
HBCO Delay 
10 seconds
High Battery Cut-in Voltage 
55.2V
SellRE (Offset) Voltage Max 
51.6V for “zero-outflow”, 53.6V for selling at “100% full”
Temp Sensors 
Do not use temperature sensors / reduce any temperature coefficients to as close to zero as allowed

FM60/80/100 Charge Controller Settings
Charge controller
Absorb Voltage and Time
55.2, 1 hours  
Float Voltage  
54.4
Rebulk Voltage  
52.5
DC Current Limit   
eBoost: 180A per battery ÷ # of controllers  
Absorb End Amps 
1A

FlexNET DC Settings

FLEXnet DC (FN-DC)  
If FLEXNET DC display voltage is not within 0.1V of inverter terminal voltage, calibrate Outback equipment   
Battery Amp houreBoost:314Ah per battery 
Charged Voltage54.0V
Charged Time15 minutes
Charged Return Amps 1A
Battery Charge96%
Relay Invert Logic  No *User adjustable
Relay Voltage  
High = 53.8 ； Low = 51.2 *User adjustable
Relay Delay  
High = 1, Low = 0 *User adjustable
MATE3/MATE3s 
FLEXnet DC Advanced   Low SOC Warning = 20% *User adjustable
FLEXnet DC Advanced 
Critical SOC Warning = 10%*User adjustable  

Calibrating Outback Systems 

Calibrating the battery means charging the battery 100% full and confirming the battery resting voltage is above 54V.  This can be done onsite or remotely.  

Calibration is not a regular task. Good times to calibration are: 

  1. System commissioning 
  2. Occasionally when batteries are kept 80-100% full. 
  3. Deep discharge recovery. 
  4. Extended periods of overcast / low production days. 
  5. Anytime when the % state-of-charge says 100% but battery voltage is below 54V.

Conforming calibration is easiest to do online but can be done onsite. 

  1. Go to OpticsRE. 
  2. Reduce all system loads and charging to a bare minimum, including charge controllers.   
  3. Determine the battery voltage on the inverter terminals.  
  4. Calibrate the charge controllers to match the inverter terminals. 
  5. Determine if the FlexNET DC also needs calibration and follow this link for further instructions: 

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