Inverters

AC or DC?

>AC or DC?

Your personal preferences are a matter for your own choice :)

Joking aside: you need to set your meter to the "DC Volts" scale and (leaving everything switched on) measure the voltage at the terminals on the inverter when the alarm sounds, next measure the voltage on the battery terminals - these two measurements should be within about 0.25 volts of each other - the less difference the better. If the difference is more than 0.25V check the terminals and battery connections are clean and tight and if it's still more than 0.25V go to a larger size cable. For a 150W inverter you really want cable of around 1.5mm cross sectional area - you could also use 32/02 cable which is a bit light for 12A but will do the job for a run of <5m

I'm a bit perplexed as to why the alarm is sounding but the inverter is not shutting down? You may have a faulty unit.

Mike Harding