Why Won't My 1000W Inverter Run my 800W Coffee Maker?

We are all assuming that the coffee maker trips the breaker on the inverter (or it just shuts off) or blows the fuse to the battery. Which is it ? Also, does it shutdown immediately when turming on the coffe maker ?

As stated above, the size and length of the battery cables make a big difference. 10 gauge wire is good for about 5' from the battery.

Also, many inverters are simply over-rated. The less expensive, modified sine wave inverters are notorious for this,

Several possible reasons "why". Need more info.

What inverter?
Is it 1000W peak rating or 1000W continuous?
What battery(s) and how old?
What was the battery voltage before and after you turned coffee pot On?
Was inverter alarm beeping after you turned the pot on?

Though, my favorite solution (and rather bulletproof one) is similar to that of Don Piano's - relieve the inverter from coffee-making duties entirely :)

The first thing to look at is the batteries, how many and their state of charge. The next thing is the size of the cables and their length. I would say one or both of these is your problem.

As mat asked, what happens? If I'm correct, you'll see the inverter shut down due to low voltage.

TWZMYJP wrote:
2018 Jayco Class A with a factory installed 1000W inverter. Why can't it operate my 800W coffee maker when there are no other 110v appliances (that I am aware of...) on at the same time??

What is the 20 HR rating of the batteries used to power this inverter? :@

1000 watt inverter is more likely a 1000 va which is not quite the same thing.

The easy solution is to get a lower wattage coffee pot.

You should have the Magnum Inverter, This is from the owners manual. Doug

Motor loads not starting – Some appliances, particularly those with
induction motors, require a much higher start-up surge than they do when
running. Pumps, freezers and refrigerators (compressors) are the most
common. The inverter may not be able to start some of these appliances
even though their rated current draw is within the inverter’s limits. If you
have the CMW1012 or CMW1512, and a motor-operated appliance refuses
to start, observe the VOLTS indicator on the digital display while you are
trying to start the appliance. If the display shows a battery drop below 11
volts while the inverter is trying to start the motor, this may explain why the
appliance won’t run. Make sure the length/diameter of the battery cables are
appropriate, battery connections are good, and the battery is fully charged.
If the cables are sized correctly, the connections are good, and the battery is
charged, you may need a larger battery bank (see Loads turning on and off).
Loads turning on and off – If a load starts but quickly turns off, then the
battery may not be able to deliver the necessary amperage to drive the load.
If the battery bank cannot deliver the necessary amperage to drive a heavy
load, the inverter will shut off due to low voltage (<10.5 VDC). The battery
voltage can then slowly rise back above the low voltage reconnect voltage
(11.8 VDC) causing the inverter to resume operation. As soon as the heavy
load draws the batteries down, this cycle will continue unless the load is
reduced or more batteries are added.
Loads too large – Although the CMW Series inverter can provide high
surge power up to two times the rated output power, some appliances may
still trigger the inverter shutdown/protection system. In these instances, a
higher power inverter may be required.

Could be that you have a phantom draw (maybe your fridge?), could be that your coffee maker is higher wattage than you have been led to believe (especially during startup), but it also could be this thing I used to hear but now can find no evidence for: That some inverters and inverter generators really don't like appliances that generate heat in the same way a toaster or electric heater does. Something about the inverter seeing it as a short? Don't quote me on it.

What happens when you use your coffee maker?