Originally Posted by rick danger
I used 0 gauge wire for a 3 1/2' run to batteries. Why wont it run a 650 watt coffee maker for 4 minutes with two freshly charged batteries? Its a 1500 watt unit. I read some reviews of this on amazon (BTW its $80 cheaper now and I bought it a week ago) and someone had the same complaint. Is the inverter just a POS?
Do the math: How many amp-hours in your battery?
650 watts @ 12V is over 50 amps per second.
So 50 times 60 seconds in a minute times 4 minutes equals 13,000 amp minutes. Divide by 60 minutes in an hour about 217 amp hours
are needed to do a batch of coffee.
The problem isn't the inverter, it is in how much absolute energy can be stored in a battery. Gasoline is over 300 times more energy dense. Propane is close at 270x.
Why do you think electric cars are so pointless in this era of cheap hydrocarbons?
If you want to make coffee and don't have access to lots of electricity (grid, genset, etc.), buy a stovetop unit.
But keep the inverter. I haven't found a 12V coffee grinder yet.