I am assuming the generator is not being maintained by grid power when in standby.
I would suggest breaking the live feed from the battery + terminal through a cheap (or expensive) ameter, accuracy is not important.
Try disconnecting any wires feeding the various parts of the electric system to identify where the leakage is.
If there is no Identifiable leak being indicated by the ammeter then there may be an issue with the battery.
If you are not able to identify what the issue is you could fit a very small float charger connected from the mains to maintain the battery, you would need to connect it's 12v output through a normally closed pole of a relay which is energised by the generator therfore disconecting it when the generator runs.
We have done this in the past on old / exposed units to keep them in a full state.
SOURCE: battery and alternator charging problem
As dumb as this may sound check the termials and if the u-shape is up then flip it over. I had the same thing happen to me on mine and now it works fine.
SOURCE: 1997 lincoln town car battery drain
Sounds like short ore you leave some dash lights on to drain the unit. If relay start to make you upset die hard made a battire that you could shut off like secuirty thing to shut down the power it cost 150 i dont know they still make it
SOURCE: 1998 Avalon XLS battery drain
Does The car shut off mid drive? Could be a Wiring harness problem,
I think it's you're alternator though, That would be a good reason you're battery is dieing,
How do you get the car started again?
SOURCE: My 2005 ford explorer check charging system warning light
if charging light is on w/ engine running,the fault could be the alternator or another component of the charging system.remove, clean and tighten battery post connections to check for alternator output,use a volt meter or multi-tester set to 50 Volts DC,w/ tester on battery terminals it should read 12 volts W/ engine off;13 to 14 volts w/engine running.if voltage increases when alternator is spinning,suspect battery
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