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Posted

Hi all,

 

I am new to Solar and we have recently had 2 x Deye 8KW inverters installed with 2 x BSL Lithium Phosphate Batteries (B-LFP51.2V 100Ah), in the morning with load shedding the inverters shutdown for a few minutes sometimes showing an error and sometimes not.

The errors when shown are as follows:

F56 DC_VoltLow_Fault on the master and F41 Parallel_System_Stop on the second unit.

There is a geyser that switches on at 5AM and off at 6AM, so I think that might been the cause, but I am not sure as the timing is for by a few minutes.

 

From what I've read the F56 relates to the battery configuration.

The one battery is connected via the fuse to positive and negative terminals, then the second battery is connected to the first battery.

 

The battery settings on the inverter are as follows:

 

Batt Mode: Lithium

Batt Capacity: 200Ah

Max A Charge: 50A

Max A Discharge: 90A

Activate Battery:  Ticked

Start: 30% (10%)

A: 40A (50A)

Grid Charge: Ticked

Grid Signal: Ticked

Lithium Mode: 00

Shutdown: 20%

Low Bat: 35%

Restart: 50%

 

Battery 1 dip switch is 1 up, the rest down, Battery 2 dip switch is 1 switch down, 2nd switch up and the rest down.

 

Then on the Work Mode, not sure if its configured correctly either. Currently configured as follows:

 

Grid Charge ticked for 1AM to 9AM

Grid Charge unticked for 9AM to 5PM

Grid Charge ticked for 5PM to 1AM

 

Power is all set to 8000 and Battery is all set to 95%

Posted

Do you have an inter-battery communication cable linking battery 1 and 2 via RS485 ports 4 or 5 (extreme right) and a BMS communication cable linking battery 1 CAN port to the inverter CAN port? These are standard RJ45 network patch cables.

  • 4 months later...
Posted

Hi Kilowatt Power,

 

sorry for the delay. Never seemed to get. Notification about your response and been a busy few months. 
 

Batteries are connected with a cable from the RS485 port, the CAN port on battery 2 is occupied with a cable going to the inverter. 
 

problem has not happened for a while since tweaking some parameters. Just have issues when power trips and geysers are on. 
 

not sure if there is a way to run all four geysers, we have put them on timers but it doesn’t really help because load shedding is so dam unpredictable. 
 

geysers are running 2000w elements. But it causes inverters to panic and shut down. Not to surprised there. 
 

Is there a way to make the work? Do we need another battery or two? Or another inverter even?

Posted
On 2022/04/25 at 12:11 AM, Kilowatt Power said:

Do you have an inter-battery communication cable linking battery 1 and 2 via RS485 ports 4 or 5 (extreme right) and a BMS communication cable linking battery 1 CAN port to the inverter CAN port? These are standard RJ45 network patch cables.

Hi Kilowatt Power,

 

sorry for the delay. Never seemed to get. Notification about your response and been a busy few months. 
 

Batteries are connected with a cable from the RS485 port, the CAN port on battery 2 is occupied with a cable going to the inverter 1. Inverters are configured to work together. 
 

problem has not happened for a while since tweaking some parameters. Just have issues when power trips and geysers are on. 
 

not sure if there is a way to run all four geysers, we have put them on timers but it doesn’t really help because load shedding is so dam unpredictable. 
 

geysers are running 2000w elements. But it causes inverters to panic and shut down. Not to surprised there. 
 

Is there a way to make the work? Do we need another battery or two? Or another inverter even?

Posted (edited)
On 2022/04/24 at 7:47 PM, Mercadian said:

Max A Discharge: 90A

This is a problem if you are in load-shedding and running on batteries only. This will only allow +- 4.3 kW to be provided from the batteries. Rather set this to 200A, which will allow the batteries to provide +- 9.6 kW. I see the inverters are in parallel, so more batteries will always help, as you have an inverter capacity of 16 kW, and a battery capacity of only 10 kW.👍

Edited by TimCam
Posted (edited)
On 2022/09/13 at 8:41 PM, Treschen said:

The four geysers are on the essential side of the inverter? They trip when all are turned on at once ? Or can you cycle them to come on one after the other ?

The four geysers are all connected on the inverter side and not eskom directly. We have put in 2000kw elements into the geysers. I did test it with one at a time and seems to be working. But this is still with solar, will try with timers again and see what happens when power goes off at night. 

Edited by Mercadian
Posted
20 hours ago, TimCam said:

This is a problem if you are in load-shedding and running on batteries only. This will only allow +- 4.3 kW to be provided from the batteries. Rather set this to 200A, which will allow the batteries to provide +- 9.6 kW. I see the inverters are in parallel, so more batteries will always help, as you have an inverter capacity of 16 kW, and a battery capacity of only 10 kW.👍

What other impact will max discharge have if it’s set to 200A? We are looking at getting another battery, as I do feel that we should have 3 minimum.

Posted

The Max Amp Discharge setting limits what the inverter will draw from the batteries. If the load requirement (during load-shedding, and no Solar), is higher than this, the inverter will try for a few seconds to satisfy the load, but will then register an F56 DC_VoltLow_Fault, and shutdown. With your two batteries you can keep the inverter "happy" with loads up to 9.6 kW during load-shedding. With a third battery you can increase to +- 14.4 kW, if you set the "Discharge Amps" to 300A under the Battery Settings.

Posted (edited)
7 hours ago, TimCam said:

The Max Amp Discharge setting limits what the inverter will draw from the batteries. If the load requirement (during load-shedding, and no Solar), is higher than this, the inverter will try for a few seconds to satisfy the load, but will then register an F56 DC_VoltLow_Fault, and shutdown. With your two batteries you can keep the inverter "happy" with loads up to 9.6 kW during load-shedding. With a third battery you can increase to +- 14.4 kW, if you set the "Discharge Amps" to 300A under the Battery Settings.

Ok great that makes sense. Thank you. Will try that out and see how it goes. should get 2.5 hours at a small kW draw am I correct? Usually we will only draw about 2kW in an evening load shedding cycle. During the day Will usually be more, but the solar will be running at least. 

Edited by Mercadian
Posted
16 hours ago, Mercadian said:

Will try that out and see how it goes. should get 2.5 hours at a small kW draw am I correct? Usually we will only draw about 2kW in an evening load shedding cycle.

Yip, with 2 batteries at 10 kW capacity, and discharging them down to 20% SOC (State Of Charge) with a load of 2 kW, your batteries should last about 4 hours. It is not healthy for Lithium batteries to be fully discharged. Some can, but the lifespan will be decreased.

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