Radian System with Forklift Batteries parameters

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Radian System with Forklift Batteries parameters

Postby dspeed on Mon Mar 13, 2017 12:00 pm

Hi All,
I’m looking for some help configuring my system.
System is as follows:

Radian 8KW GS8048A Inverter
Mate3 - Firmware 3.15.3
2 – FM80 Charge Controllers
1 – Flexnet DC
Hub10
7200W solar array.
2 – 48VDC Deka Maxpwr series 24-125-17 forklift batteries. 2 years old. 3560AH total usable capacity.
Capacity of each battery is 1130AH 6 hr rate, 1780AH 20AH rate. These batteries are rated to normally go to 80% DOD.
The AH rating leaves a 20% reserve capacity. So the 1780AH is my usable capacity for each battery.

---------------
Deka has provided me with some information that is a little confusing when translating it to settings to use on the Radian.
Below is the text of the information from Deka:


The Max-Powr cells you are using are considered P140-17 cells and are rated at 1120 ampere hours at the six (6) hour rate. Full charge specific gravity is 1.320 @ 77 Degrees F. These Max-Powr cells are considered Motive Power cells, therefore, some of the setting questions you have listed will not apply to this product. A typical charge profile for the Motive Power battery is as follows:

Charger start rate: 16-20 amps per 100ah rating of the battery.
80% charge: 2.37 volts per cell.
Finish rate: 5 amps per 100ah rating of the battery.
Equalize Charge: 3 to 5 amps per 100ah rating of the battery for 3 hours after full charge on a weekly basis.
80% Depth of Discharge: 2.00 volts per cell, Open Circuit.
Float Voltage: 2.25 – 2.27 volts per cell.


The 2.37 volts per cell is the on-charge voltage at 80% state of charge. The 2.00 volts per cell is the open circuit cell voltage at 80% depth of discharge.

Full charge voltage, open circuit, should be 2.12 – 2.15 volts per cell on a healthy Max Powr battery.
The full charge specific gravity for a Max Powr battery should be 1.320 – 1.325 corrected for 77 Degrees F.
The on charge at finish rate of 5 amps per 100ah for a healthy Max Powr battery will range between 2.60 to 2.70 volts per cell.

I would recommend the Absorb End Amps would be very low somewhere around 15 amps to maintain a float voltage of 2.25 to 2.27 volts per cell, after the cells are fully charged and confirmed by specific gravity data. The Absorb End Amps will depend upon the health of the cells and you are correct, the End Amps will increase as the cells age.

What I am looking for the system to do is:
1.Supply the house load using power from the panels.
2. Keep batteries at full charge until the panels can no longer support the load.
3. Export excess power to the grid after #1 & #2 are met. But not use battery power to produce power for export. Export only excess solar power.

--------------

I am seeing that the system is providing power to the house and is exporting to the grid. It also starts using battery power to produce extra power to export to the grid. I want the batteries to remain at as full a charge as possible during the day so it will be available to use at night or on cloud days.

Present settings:
Mate3
Global Charge
Max Battery Charge – 150Amps

GS8048A
Battery charging

Absorb Voltage – 64VDC
Absorb Time – 4 hours
Float Voltage – 54.4
Re-Bulk Voltage – 50.4
Float time – 4.5 hrs
Re-Float Voltage – 50VDC
Eq Voltage – 64.8VDC
EQ Time – 1.1 hrs

AC Input
General
AC Input Select Priority – Grid
Charge Operating – Off
Charger AC Limit – 30AAC

Grid
Grid input mode – GRID TIED
Grid-Tie – Yes
Sell Voltage – 52.8VDC


FLEXnet DC
Battery charging

Battery AH 3560
Charged Voltage – 64.8
Charged Time – 20 min
Charged Return Amps – 28A
Charge Factor – 90%

FM80
Battery Charging

Absorb Voltage – 64.8
Absorb Time – 4hrs
Absorb End Amps – 18ADC
Re-Bulk Voltage – 52VDC
Float Voltage – 54.4
Current Limit – 75ADC
Eq Voltage – 64.8VDC
Eq time – 1Hr
Auto Eq Interval – 0 Days

Misc

Grid-Tied Mode - Enabled
Auto Restart Mode – Off
Wake VOC Change – 6VDC
Wake Interval – 5 Min
Battery Voltage Calibrate - -0.5VDC


Any help would be appreciated. Please let me know if there is any other information needed.

Thanks
Dirk
dspeed
Junior Member
 
Posts: 2
Joined: Fri Nov 25, 2016 7:49 am
My RE system: Radian GS8048A
2 - FM80 Charge Controller
Mate3
Hub10
Ground mount 7200 Watt solar array
2 - 48VDC 1780AH Deka forklift FLA batteries

Re: Radian System with Forklift Batteries parameters

Postby blackswan555 on Mon Mar 13, 2017 1:19 pm

Can not help with your grid tie settings but an observation,
Absorb Voltage – 64VDC
Way to high, 59v would be a better starting place @ 4hrs absorb, Check your SGs regularly and adjust to suit

Tim
My comments are based on my experience and research, They are not endorsed or checked by Outback.I am an independent British electrician living in Spain, So please take this into account when reading /acting on my post`s.
blackswan555
OutBack Emperor
 
Posts: 2516
Joined: Sat Aug 30, 2008 5:50 am
Location: Ibiza Spain,
My RE system: Other peoples, VFX "E" versions, FLA`s, Generators.

Re: Radian System with Forklift Batteries parameters

Postby dspeed on Mon Mar 13, 2017 3:20 pm

Thanks for the reply.
I have changed setting to

Absorb Volt - 59
Absorb end amps - 24
Re-bulk voltage 57.2
Float Voltage 58
eq Volt - 61.8
dspeed
Junior Member
 
Posts: 2
Joined: Fri Nov 25, 2016 7:49 am
My RE system: Radian GS8048A
2 - FM80 Charge Controller
Mate3
Hub10
Ground mount 7200 Watt solar array
2 - 48VDC 1780AH Deka forklift FLA batteries

Re: Radian System with Forklift Batteries parameters

Postby blackswan555 on Mon Mar 13, 2017 4:03 pm

You may also want to check your FNDC setting
FLEXnet DC
Battery charging
Charged Voltage – 64.8
I do not do GT so am not 100% but if IIRC it should be one notch below absorb voltage (0.4v) Anyone confirm please ?

Tim
My comments are based on my experience and research, They are not endorsed or checked by Outback.I am an independent British electrician living in Spain, So please take this into account when reading /acting on my post`s.
blackswan555
OutBack Emperor
 
Posts: 2516
Joined: Sat Aug 30, 2008 5:50 am
Location: Ibiza Spain,
My RE system: Other peoples, VFX "E" versions, FLA`s, Generators.


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