DIY Powerpack

Hi all,

I have been reading the many archived posts about diy powerpacks.

I am looking to purchase a Waeco 50l (or something similar) but working out how I can power it for our once a year fishing trip up north to steep point. We don't use the 4wd's at all for about 5 days and take different vehicles each year so an external powerpack is a good idea (I don't have a dual battery and don't want one).

We take a large generator which we run for 5 hours in the morning and 5 hours in the evening.

So I was thinking of plugging a charger to the genny, a DIY powerpack (made out of a $60 casing and a marine battery) to the charger and then the fridge.

By running the genny every 5 hours I think the battery will continue to be topped up and we can run the fridge pretty cold 24hrs a day.

So my questions -

Will it work?

Is the battery OK (to keep the costs down I can take it out of the boat for the week). So not asking if it is ideal but will it work without damage?

Is there something easier? ie leaving the fridge in the car and just recharging the main battery..... but then I would need to continue changing leads and plugs.

Also don't want a 3-way fridge as the rest of the year the 12/240 will do fine

Thanks for reading this long first post and hopefully for your advise.

Cheers

Craig