The 120v power supply for my comp speakers fried when my conv went into boost (14.8). Could my inv voltage have spiked? I have an AIMS 300w psw.

64thunderbolt wrote:The 120v power supply for my comp speakers fried when my conv went into boost (14.8). Could my inv voltage have spiked? I have an AIMS 300w psw.If battery voltage hits the inverter's cut-off set-point of say 15v, the inverter will shut off.So not sure which way voltage drop works inverter-battery but I think it is higher voltage at the inverter end of the wire, so 14.8 battery might look like 15 to the inverter so it shut off? In shutting off like that would that harm the speaker power supply?Is it really fried? I suppose you tried it in a regular receptacle instead of the inverter's as a check?

yes I put it in a reg rec and it is dead. This is the second set that this has happened to. Has me puzzled. I know I an not buying another set till I get it solved. I am hearing impaired and use them on the tv. They work well until the conv goes to 14.8 then they are gone. Has nothing to do with low voltage. It is not the speakers themselves the power supply is DOA.

How is the inverter wired to 12v? I also use powered speakers from a MSW 150w inverter, but it is just plugged into the 12v socket in the Winegard. Thing is the 12v plug has a fuse in it, so I think that protects the inverter from anything funny happening to its 12v input and so anything plugged into the 120v output (maybe). Of course the Winegard socket is also on a fuse in the DC fuse panel marked TV.Could you test the output of the inverter with a meter just as the converter goes to 14.8 and see if it spikes?

Checking the a/c is my next move. The inv is in a cab above the fridge and wired to the batt term on the back of the conv. I have thought about a surg protector and pluggin the speakers to that.

Another good reason to power an inverter from the batteries. The power from the converter may not be that clean, an AC carrier could be in the output and the inverter may pass that ripple through to a device. A battery acts like a big capacitor so any AC on the converter's output or a DC spike will be eliminated.A typical surge protector on the AC from the inverter will probably not save your bacon, most of these are typically MOV devices that only drop connection when there is a lot of energy to dissipate (think dead short or lightning). A filter and surge protector may catch any nastiness before it hits the speaker's PS. The price of a different set of powered speakers or using passive speakers connected to an audio output may be less than rewiring or buying an AC filter.

Fried | Good Sam Community

64thunderbolt
Explorer II
Oct 19, 2014
yes I put it in a reg rec and it is dead. This is the second set that this has happened to. Has me puzzled. I know I an not buying another set till I get it solved. I am hearing impaired and use them on the tv. They work well until the conv goes to 14.8 then they are gone. Has nothing to do with low voltage. It is not the speakers themselves the power supply is DOA.
BFL13
Explorer II
Oct 19, 2014
64thunderbolt wrote:
The 120v power supply for my comp speakers fried when my conv went into boost (14.8). Could my inv voltage have spiked? I have an AIMS 300w psw.

If battery voltage hits the inverter's cut-off set-point of say 15v, the inverter will shut off.

So not sure which way voltage drop works inverter-battery but I think it is higher voltage at the inverter end of the wire, so 14.8 battery might look like 15 to the inverter so it shut off? In shutting off like that would that harm the speaker power supply?

Is it really fried? I suppose you tried it in a regular receptacle instead of the inverter's as a check?

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