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Topic starter
May 15, 2025 8:31 pm
I have a few instances of the inverter restarting with W028 during day time. Batteries are 100% charged. No Grid input (not yet, working on it). It happens when I turn on the Microwawe (1250W, start up 1460W). The AC output is balanced and the Microwave is on L1. L1 would be using about 800W. L2 could be upto 1700W.
I have 7110W PV input and easily get 6000W at these times. But since batteries are fully charged PV output would be limited to say 2500W.
Can the 6000XP immediately increase the PV output or battery discharge to handle this load? Am I getting W028 because it is unable to do so? Will connecting Grid Input solve this issue?
May 15, 2025 9:51 pm
If both L1 and L2 are balanced and there is enough solar power to cover the active loads, the inverter should automatically supply the necessary power from solar. If solar alone isn’t sufficient, it should draw from the battery to help meet demand. The 6000XP is an off-grid inverter that prioritizes solar and battery power before pulling from the grid.
What is your discharge current set to?
Just to confirm, you’re certain there’s enough solar available whenever you’re running the microwave?
Topic starter
May 15, 2025 10:46 pm
@eg4eric I have a EG4 Battery rack with 6 LL-S batteries for a total of 600ah. When this happens batteries are at 100% SOC. At that time systems limits PV to manage just the current load. It was close to 1pm and it was pretty sunny and I am sure the strings would have been able to pull the necessary load.
Discharge current limit is set to 140A.
I have attached an extract (few relevant columns) from the data logs here.
Topic starter
June 9, 2025 3:16 pm
@eg4eric I DM'd my serial number to you. I had a few more instances of EPS overload when turning on the Microwave.
June 9, 2025 6:32 pm
the inverter should automatically supply the necessary power from solar.
@eg4eric, the detail of his system's solarPV input being curtailed down to only support the load is likely an issue since there's no way the MPPTs can ramp up power fast enough to handle the instantaneous ~1500W load from the microwave start-up. You likely nailed it asking about battery output limits and since the batteries are at 100% the power FETs aren't already on like they'd be during charging.
When you all find the solution, please post to the forum what that solution was since I can see others running across this and moreso as summer approaches and batteries get refilled quicker followed by HVAC system loads start cycling on/off.
June 11, 2025 7:46 am
Just thinking out loud here — maybe the inverter and battery system just can’t react fast enough when the microwave kicks in with that big power spike. Even if the sun is bright and batteries are full, the sudden load might be too quick to handle without the grid to back it up.
Maybe the battery discharge limit is holding things back, or the inverter’s protective settings are kicking in to avoid damage. Could connecting the grid smooth this out? Seems like it might.
Would be cool if someone figures it out and shares back here — these quick load surges can be a headache for a lot of setups.
