I have: two solar panels of about 70-100Wt (self made from ebay elements) a bundle of two 200Ah 12V AGM accumulators a cheap ($30) Chinese charge controller

I have: two solar panels of about 70-100Wt (self made from ebay elements) a bundle of two 200Ah 12V AGM accumulators a cheap ($30) Chinese charge controller a cheap Chinese invertor it writes on it 1500Wt but it sometimes stops on some 800Wt hardware (may be starting currents are too big) I'm using the invertor for notebooks, water pump, blender, even when it doesn't have load it consumes about 0.4A/hour so we're turning it off, especially during winter. We're trying to use as much car chargers as possible also our led light is 12V linked directly to accumulators.