Do inverters become less efficient with age?
we typically spend two to three weeks away cruising in the NW, on average charging for five hours. At rest in the evening or moored during the day with the inverter switched off, the voltage stays steady in the high 12 volts.
When we switch on the inverter the voltage falls to below 12 volts in under two hours. Admittedly we only have the inverter on for TV (we know not to use hair driers, vacuums, washing machines etc without running the engine).
Is this indicative of aging batteries (bank of four deep cycle batteries- probably over five years old), or might it be a faulty inverter? Or should I just buy a 12v TV?
owen7