In any case it’s the wrong application. Solar works great if you know how to do it. It’s not hard, and it’s not expensive.
Hi…I’m speculating your batteries were not completely energized or that they’re mature enough/got frozen/have a consumed association that they don’t hold the degree of charge they once did.
Do you have a voltmeter/multi-meter? The DC voltage of your batteries today, when it’s not working, will assist us with diagnosing.
I suspect these:
The battery is low.
The battery cable is not helpful to circulate the current so try using a compatible battery cable. You can get assistance from Bestek in this matter as well.
The inverter may be problematic; it may be that the inverter is unable to convert DC to AC very well.
Before you contact Bestek, please make sure that you do not have a faulty battery and battery cable.