Need some APU help........

Ok, so i got an optima yellowtop deep-cell agm---model D34/78. A Husky (home depot brand)750 watt inverter. And a portable, radiator type electric heater.



NOTE: that i am testing inside a car because this simulates the approximate size and conditions of a truck cab/sleeper.


What is happening is that when i have everthing hooked up and turn it on, i'm getting a buzzing sound out of the heater; When you plug it in to a wall outlet, no buzzing. This buzzing sound is a little too loud to sleep comfortable and more importantly it does not sound right to the point where i feel something may be wrong.

a) What's causing this and how to remedy if possible.

b) Would going to a quartz heater be better and get rid of the noise?

Any other practical solutions to get heat?; i need about 8 hours of decent, though Kenya-like levels are unnessesary and unwanted, heat----say around 65 degrees. Small cab/sleeper. i have no other electrical loads, such as tv microwave etc.

 

There's a sticker on the side that says w 1500, so i'm ASSuming 1500 watts?


2) Considering the webasto and clones i like them but want to keep costs down.

 

i should add that i don't know jack about electricity......

 

Ok, so it looks like i either need to get a bigger inverter or move down in heater size. i was not actually wanting to use this heater, but it's what i had available for testing. i would like a smaller heater anyways for portability reasons.

NOTE: that i did not know what questions to ask-----it is/was apparent that as it pertains to electrical matters i do not know what i do not know. Therefore did not know what questions to ask. But you all spurred the thought process and i am learning quick. Thanks.


What works for you? Keep in mind i got a small cab and only need to maintain 65-68ish degrees for about 8 hours.

 

Yeah, i forgot to mention that for testing right now i'm just using one battery, but was thinking that i would have to use at least two in parallel.