# What size inverter to run a small microwave? (1 Viewer)

#### colyboy

The other half thinks ( don’t ask me why!) she would like a SMALL size microwave. What size of inverter would be needed? Any suggestions please.

Colyboy

#### MichaelT

LIFE MEMBER
What's the maximum draw on startup?

#### Emmit

LIFE MEMBER
Just a little bit of info. re the consumption of a microwave.

Our kitchen based Samsung has a nominal wattage of 800 Watts.
However, in addition to the surge that occurs when a device is switched on, (I understand in the region of 1400watts) ours has a wattage of 1150-1200 Watts when it's in operation.
Don't know where the 800watts comes from but ours uses far more than that.

#### Stealaway

##### Free Member
2000 watts minimum Even a small microwave is going to be 1200w. That would pull at least 110 amps from your batteries for every minute it on

#### bigtwin

LIFE MEMBER
Our kitchen based Samsung has a nominal wattage of 800 Watts.

That’s thermal power (i.e. output power), not electrical power consumed.
Don't know where the 800watts comes from but ours uses far more than that.

See above.
ours has a wattage of 1150-1200 Watts when it's in operation.

That’s electrical power (input).

Ian

#### Emmit

LIFE MEMBER
Isn't that part of the info. that Colyboy needs to know.
How many folk on here think an 800watt microwave uses 800watts? (after it kickstarts at 1400watts.)

#### Bart

##### Free Member
The other half thinks ( don’t ask me why!) she would like a SMALL size microwave. What size of inverter would be needed? Any suggestions please.

Colyboy
We run / have ran 3 different microwaves using our 1500w pure sine inverter.

#### pappajohn

LIFE MEMBER
Whatever microwave you select check the INPUT watts on the data label on the back/underneath then double it then add a bit more for loses and startup power.
1000w input X 2 =2000w
Add 500w for startup and inverter losses.
2500w inverter

#### MichaelT

LIFE MEMBER
Isn't that part of the info. that Colyboy needs to know.
How many folk on here think an 800watt microwave uses 800watts? (after it kickstarts at 1400watts.)
Yep hence my query about max draw on starting.

#### MisterB

LIFE MEMBER
I tried a few different invertors (and had our microwave reduced to 650 watts) before I settled on a 2kw pure sine wave(4kw peak power) eventually! I also installed a 300ah lithium battery.

I have used it a couple of times since (almost) finishing the installation and it seems to be doing what I hoped it would, though the big test will come when we go away

#### Lenny HB

LIFE MEMBER
Also if you fit a good quality inverter like a Victron you don't need to oversize it so much as they can handle the short term startup current.

So to prove a real world test, it’s a 700 watt microwave with a 1150 input power.

The Victron inverter is 1200VA model and the specs while the microwave is in use are below.

The Victron runs it easily at full power.

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