EG4 6500 Inrush Amp Limit

I'm attempting to use a EG4 6500ex-48+LifePower4 48V 100AH to power a Super Split Wood Splitter with a 1.5HP 115v, 60hz motor. I've measured the inrush max amperage at 68-69A which seems to last for a split second before idling down between 2-12A during operation.

On the 6500, the unit immediately crashes upon motor power on, not display any output voltage and coming back online after 20 seconds or so. Earlier I tried the with a EG4 3000EHV-48 and instead of crashing the overload protection came on, but eventually powered off after 10 seconds with the motor never getting up to speed while making terrible clanking noises, unlike when it's plugged into the grid.

Upon reaching out to the dealer and EG4, they've shared the following "This unit is too large for the EG4 3k or EG4 6.5kw. While both can surge, the time frame that it is surging is too fast for the inverter. The grid is capable of meeting this, as it basically has an unlimited amount of amperage available to pull from. There are soft stars that he may use for this that could remedy this issue."

I'm curious what others have found with high inrush amperage loads, whether the overload protection should be able to handle it and what steps may be taken to troubleshoot further? Attaching photos of motor, inrush measurement, and kW usage via grid power.

Inrush is too much, too fast.
I would see if you can add a soft start.

When I tried to start my 3.5 ton AC it overloaded and shut down. I believe there’s a “restart on overload” option but wouldn’t help in this situation.

Is there another inverter that would be better suited for this application? Would low frequency help?

The 6500 is rated to operate for up to 5 seconds at 13kW. If my grid peak reading is only 7.5kW, I'd think the overload protection would be able to handle this. It's unclear what the amperage overload protection is based on the specs.

Any theories why the 3000 inverter seems to work better than the 6500 in this scenario i.e., runs for 10 seconds on overload, whereas 6500 instantly crashes?

Either a larger high frequency or a low frequency will work better.

It's usually one of two things.
The surge is too much for the inverter. Or it's too much for the battery serving the inverter.

milopalmer said:

Is there another inverter that would be better suited for this application? Would low frequency help?

The 6500 is rated to operate for up to 5 seconds at 13kW. If my grid peak reading is only 7.5kW, I'd think the overload protection would be able to handle this. It's unclear what the amperage overload protection is based on the specs.

Any theories why the 3000 inverter seems to work better than the 6500 in this scenario i.e., runs for 10 seconds on overload, whereas 6500 instantly crashes?

Click to expand...

You need more than one battery.

I'd also run the splitter on 240V so a second 6500EX would be needed. You might get by with a single battery on each unit. But attempting to run a large 120V surge with a single 100Ah battery won't work.