Question about inverter

[nzfisher]

Yanmar 2011 R25sc with promariner 1500$ inverter/ charger. I have a question regarding ac output while boat is running. The AC gauge shows 85 volts with the engine running at idle and switch altered to inverter activation. Does not seem to change as Rpms are boosted to 1400 or so. Is this acceptable or normal? Alternator seems to be working as battery current increases a couple of volts at alternator Cable contact point with battery Does this seem normal or acceptable? 85 volts seems pretty low to me. Originally thought it might be alternator going bad, now not sure. My knowledge on this subject limited so looking for any help more knowledgeable people can offer. Thanks-

Swims with Tuna

 

[BradOwens]

Some inverters will only put out 80 to 90 volts unless there is a load placed on them. Try plugging an appliance in to one of your outlets then activate the inverter and check the voltage.

 

[allanrs74@gmail.com]

I picked up the same low AC voltage during my survey prior to purchasing my 2016 R-27C and noted it on my purchase agreement. After some research and speaking with a couple people competent in this area, I was convinced that it was OK and that when a load is requested it will put out 110-120VAC. I've had the boat for 3 years now and have had no problems with the AC system when the engine is running.

Happy New Year.
Bob

 

[BB marine]

A modified sine wave inverter will show lower voltages at the volt meter. However, the normal amount of power will be transferred to the load. This does not indicate a problem. In order to measure a modified sine wave or a distorted waveform, a more expensive "true RMS" meter is required.

A pure sine wave inverter will read identical to shore power with a simple voltmeter. I know the earlier inverter models installed in Rangers and Cutwaters were modified sine wave inverters.