I have a solar electric system installed in the Philippines. I recently upgraded to the above Inverter and I upgraded to a Pylontech Fidus Plus battery. I have a 1.5HP well pump with a slow start. When the pump starts, the inverter shuts down with low battery. Here are my inverter settings:
TAB: General
System frequency 60Hz
Shore current 10.0 A
Overruled by remote checked
Dynamic current limiter unchecked
External current sensor connected (see manual) unchecked
State of charge when Bulk finished 95.0 %
Battery capacity 314 Ah
Charge efficiency 0.95
TAB: Grid
Country / grid code standard Other: not compliant to any grid code standard
AC input 1 Above selected gridcode plus LOM B (safe)
Accept wide input frequency range (45-65 Hz) checked
AC low switch mains off 180 V
AC low switch mains on 181 V
AC high switch mains on 225 V
AC high switch mains off 250 V
UPS function checked
TAB: Inverter
PowerAssist unchecked
Inverter output voltage 230 V
Inverter DC shut-down voltage 44.00 V
Inverter DC restart voltage 48.00 V
Low DC alarm level 48.00 V
Do not restart after short-circuit (VDE 2510-2 safety) unchecked
enable AES unchecked
TAB: Charger
Enable charger checked
Weak AC input checked
Stop after excessive bulk unchecked
Lithium batteries checked
Disable VSense (for diagnostic purposes) checked
Configured for VE.Bus BMS unchecked
Charge curve Fixed
Absorption voltage 52.00 V
Float voltage 51.00 V
Charge current 140 A
Repeated absorption time 1.00 Hr
Repeated absorption interval 7.00 Days
Absorption time 1 Hr
TAB: Virtual switch
TAB: Usage
Virtual switch usage Do not use VS
TAB: Assistants
TAB: Assistant Configuration
ESS (Energy Storage System) (size:1033)
*) System uses LiFePo4 with other type BMS
(This can be either a BMS connected via CAN bus (e.g. a Lynx Smart BMS) or a
BMS system in which the batteries are protected from high/low cell voltages by
external equipment.)
*) The battery capacity of the system is 314 Ah.
*) Sustain voltage 50.00 V.
*) Cut off voltage for a discharge current of:
0.005 C= 46.00 V
0.25 C= 45.00 V
0.7 C= 44.00 V
2 C= 43.00 V
*) Inverting is allowed again when voltage rises 1.20 V above cut-off(0).
*) Relevant VEConfigure settings:
Battery capacity 314 Ah.
PowerAssist unchecked
Lithium batteries checked
Dynamic current limiter unchecked
Storage mode unchecked
Total size of all assistants including the required
(hidden) system assistants is: 1092
TAB: Advanced
limit internal charger to prioritize other energy sources unchecked
I can share my installation link via email if need be.
I am also running a Cerbo GX and I have six 560W solar panels in a 3S 2P configuration running to a 250/70 TR MPPT charge controller.
I have been using AI (dangerous I know) to configure my system.
Yes, the Pylontech BMS is in control. It is connected to the GX and I can see it in the configuration. I have been able to achieve much better stability over the past hour by changing some of the other settings and setting the slow start for a 20 second ramp up. The system ran without faults with solar and grid disconnected. I changed Inverter power from 3000 to 7000. That setting was there before I got the larger Pylontech Fidus Plus 314Ah battery. I also enabled Power Assist with a Current boost factor of 2.
What DCL is the battery sending to the BMS? Post the chart of limits here please.
Same with the BMS chart for battery voltage and current.
These issues typically exist because the surge current from the pump is enormous and the battery is too small and cuts out.
And never, ever use AI for a technical solution like this.
This battery is not on the support list currently but since the BMS is sending limits the system should have what it needs in the mean time and Victon’s DVCC caters for their 16 cell packs.
The details in the docs are for 15cell batteries so cutoffs should be higher, I would contact your supplier or pylon support for updated config specs.
Thank you sir. ESS has cutoff voltage for different current discharge rates in ESS. 0.005C 46V, 0.25C 45V, 0.7C 44V and 2C is 43V. Is that what you are referring to? I will get in touch with the vendor. Ever since made the changes cited previously the system has been stable but I do need to confirm recommended settings to be sure that battery charges properly.
Best regards,
No, I asked about the BMS parameters being sent to the GX.
This is a widget you can add, with the battery voltage and current, from VRM’s advanced tab.
Pylon have a habit of advertising a discharge current of X on their brochures but being way more conservative on their BMS.
You have an inverter capable of demanding 400A peak power from a pack that the brochure rates at max 200A, with a pump trying to start and a low-frequency inverter that could be challenging for your battery (settings not withstanding).
This gets disabled with ESS while running the assistant. So it should be disabled if you are using the ess assistant.
Power assist also has no use during inverting.
These are usually all 46v.
And charge voltages 52/15Ă—16 = 55.5v
51/15Ă—16 =54.4v
What you need to do is zoom into a window when the system cut out, please include the battery voltages and current draw, and take a screenshot.
Then do the same after you made changes.
I have been trying to do that, but the battery voltage is well above the threshold. I was able to download an Excel spreadsheet which may shed some light.
Thanks again. It is getting a little late here in the Philippines.
The inverter gives the warning and shuts down. Sorry I didn’t answer sooner. The system seems to be working within constraints now. I am comparing the original configuration to the one currently in place.
Do you have enough DC cable as in size and gauge.
I see the fidus has 2 terminals are they both wired to the 10kVa or a buss bar?
I am wondering if maybe there is volt drop or something causing this.
I am running 2 pairs of 2/0 cables to the bus bar, each with 200A mega fuse from the inverter. I am running 2 pairs of 1/0 cables to the bus bar, each with 150A mega fuse from the single battery. I followed Victron and Pylontech guidance as best I could. My system has been stable since I made some changes to my settings. To be honest, I am not sure which change or changes made the difference. I haven’t seen any noticeable voltage drop when I put my meter on the inverter battery terminals under high loads. (Running heat gun, microwave and water pump at the same time.) I had the inverter power limited to 3000 watts before I added the larger battery to my configuration. It is now set for 7000 watts taking into consideration the heat here in the Philippines. I also set peak shaving to always. I also configured the water pump slow start for a full 30 second ramp up. At some point, I will add a second battery.
