I had it connected to the car battery and it was working fine, I had gotten some static electricity from the inside of the car interior while vacuming, and had touched the vacumn and it shut off. I took vacum inside and it worked fine on 120v household current. Now the inverter doesnt work..the whine/shrill sound when you disconnect it from the battery is still there, but when I plug the vacumn into the inverter, it doesnt work....Any ideas?. there an internal fuse that can be replaced?
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Assuming there is nothing wrong with the inverter or heater.
You need to check the voltage on the input clamps of the inverter (+ & - connections on the back of the inverter) when going under load, if the voltage is going under 12 volts as it is applying power to the heater there is a connection or volt drop issue.
The inverter is capable of drawing up to 190amps from the battery this can cause damage to the battery.
It is very rare for an inverter of this size to be used on 12 volts.
There are a long list of calculations which I am not going to bore you with, but for this inverter to run on a 12 volt battery system and not cause unesesary damage to the batteries you would need 8 x 120AH deep cycle batteries.
Yes, just be sure connections are heavy enough wire, and obviously the inverter uses 12 vdc input. Hook jumper wires positive to positive, negative to negative, on all 12 volt batteries. Deep cycle batteries will work better than car batteries. Just remember, when re-charging them, that they last longer when charged slowly, so don't use a high amp setting on charger and to monitor them closely, and do it in a well ventilated area, away from any ignition sources.
If your appliance draws over 300W or if your 12 v battery charge is low you will get a loud beep warning. Do you get the same beep with a low current appliance like a lamp? Make sure your battery has a good charge.
Some appliances have huge draw at start up even though they are rated under 300w your inverter may not be able to start.
Also some electric motors don't like modified sign wave inverters. What are you trying to run and what is its rated watts?
I had my inverter beep when I had it connected via a cigarette lighter plug but when I used a connection straight to the battery it worked fine. I was running a 500w grinder on a 1000w el cheepo inverter.
Inverters works from 12v carr battery or backup battery, you can not charge the inverter you msay killed your inverter if you connected to 120v wall mount...you use the inverter to give you AC (electric) from 12v battery. if your tv is 12v you need to know how much needed to get the correct connrection as output and input.