how much power do i need

Hi, 3 or 4 days will be easily done. If its warm weather. In cold weather you should get more then a week. Charger is big enough, its voltage that does pushes current in, not the size of the charger. A smaller charger will just take longer. A 10 amp charger will take probably 48 hrs to charge 2x120 amp batts from close to empty. However, your alternator will do it much quicker...but at a cost of doing more damage to batteries due to high current
Cheers

Currently run two 110amp trojans in the camper trailer. run some low draw lights and a 50 ltr waco. can get at least 6 days up to 7 weather dependant.

Cant help with the charger, I run a battery fighter at home but it only puts out .75 amp and takes 3 to4 days to fully rechage.

I have the 60l Engel Combi, and it really depends on how you are going to use it as to how long the batterys will last. If you intend to have the freezer section well below 0 degrees C, then the batterys wont last that long at all. If you can cyrovac your meat and have the freezer operating just above 0, you will extend your battery life considerably...
Hope this helps
Drew

Question to throw back to you , how many amps per hr does your Engle use ??? by the Engle blurbs should be round 1.9amps per hr once the unit is down to temp , 1.9 x 24hr = 45/46 amps give or take 10/20% for ambient temp variations and you can start to see how much power you need , to give your batts any chance of achieving the longevity that they are capable of you should not discharge below 50% ,,ergo 2 to 3 days for the Engle pre chilled and batts starting fully charged..

Lost,

I doubt that the XS7000 will have enough grunt for 2 x 120 amphr batteries. I have one, and it's a great little charger, but takes 15 - 20 hours just to bring a 100 amphr battery up to float. And that's with no load.

Go the bigger one.

Hooroo...

I've read some of the responses and fair dinkhum, some people don't understand electrics.

Proviso 1. If you ever hope to get some life out of your AGM batteries, NEVER discharge them below 50% of their capacity. Hence you have 110 amps available. I personally prefer to discharge them less than that.

Given you have 110 amps available; the Engel will draw about 50 during an "average" day, say mid 20's. In summer, on a hot day, it could draw as much as 100 amps. In the guts of winter you may only draw 30, but it would be a bloody cold trip.

In essence on a trip in Autumn weather, two days would be the max before you start hurting the battery.

Solar, or a gennie and decent battery charger is the way to go. You can of course run your engine to help charge via the alternator. It's a very effective "generator".

thanks for all the info, il be looking into it all a little harder next week and then go bi the batterys and charger that i work out that will suit.

i wont have solar but are taking a small cheap genny with me so i can run the charger off that if i have to
thanks