Stick with your 12 volt system.
If you are going to replace this unit, is it a straight inverter or inverter charger, I would go preferably for a Victron Multiplus 12/1600/70 ( 12 volt, 1600 Watt with a 70 amp charger)
Outback marine have these for about $1600.00 a 2000 watt unit with an 80 amp charger is approx. $2000.00
It all depends on your electrical load and requirements, but stick with a pure sine wave inverter as you this way you will not have any problems running equipment.
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