Goodwe GW5048D-ES with 8 x 230 amp hour lead acid batteries

[Pieter_vdw]

Hi I am having trouble configuring my Goodwe system to get my batteries charged up to 95% and up. Has anyone out there got lead acid batteries connected to the Goodwe GW5048D-ES?

I have 2 strings of batteries with 4 batteries in a string. In total a 48 Volt system. They are 230 amp FNB batteries. See pic.

Anyone got an idea on how to overcome this? Please see my PV Master settings.

Thanks!

Edited July 17, 2019 by Pieter_vdw

[Bobster.]

I recently had a similar inverter installed. At first it didn't track SOC properly, which led to a complete system failure at one point, as the inverter sometimes "thought" the batteries were charged when they weren't. What the inverter "saw" and the app reported was not the actual SOC of the batteries.

The installer updated the firmware on the inverter, and now it tracks SOC far better.

I'm using Li Ion batteries.

[Pieter_vdw]

Hi thanks for the feedback. Thats a bit worrying if the system cant track the SOC properly as I also have it set to 50% DOD as a max! 

Do you know what firmware version you are on?

[naz_eg]

I had the same situation as you and found the reason of this problem was the firmware.  The new firmwares calculates the lead acid battery SOC wrongly so i returned to firmware 131306 and the problem has gone.

[Wetkit]

Ok, so the first thing that I saw was your very high charging current. Should that not be around 46Amps? 460AH * 0.1C ?

Next one is your floating current is again on the very low side? 3Amps?
Your invertor will charge your batteries at 59V until the charge current drops to 3 Amps for 30 minutes. This could take a very long time!!!
Only at that stage will the unit report 100% SOC and drop the charge voltage to Float.

Please monitor your system on a sunny day where you did not discharge your batteries during the night.
Then see at what amps the batteries settle at once the voltage reach 59 Volts for some hours.
Then make that amp value your new floating current, or say 1 amp more than that.
Otherwise you never going to reach full 100% SOC on the system and might even overcharge your batteries!

If you have General Mode (Self Use First) configured, the invertor will not use mains to charge your batteries, so once solar power is less than consumption, your batteries will start discharging again.

Again, just me, but I would also lower my discharge current to say 42 Amps. That should offset your 2000W normal draw nicely.
Remember, this is only a limit for while there is mains power.
When mains power is lost, you would still be able to draw the full 4600W from your batteries.

Perhaps you also need to look at your DOD settings. Your on-grid and off-grid values is the same.
What could happen now is that during the night your batteries drain down to 50%, normal operation.
If after this you now have a power failure, your system would not work, as your batteries is already down to 50%.
Perhaps look at setting your on-grid DOD to 40% and your off-grid DOD to 60%?
That will give you and extra 20% safety for power failures at night.
During the day with PV power, it should not really make a huge difference.

[JJF]

On 2019/08/15 at 3:38 PM, naz_eg said:

I had the same situation as you and found the reason of this problem was the firmware.  The new firmwares calculates the lead acid battery SOC wrongly so i returned to firmware 131306 and the problem has gone.

Hi naz_eg.

Where did you find the firmware version 131306, as I also had to install older firmware, but was only able to get my hands on 121204.