A question for the techies (as I have no idea about this stuff), will 300w of solar power and two 110ah batteries, be enough to let me run my RV off-road indefinitely and if not, for how long then?

I will be running a 12v fan a 140L 12/240v fridge and led lighting, and will also be charging two iPad's and iPhone's regally, and occasionally I will be charging a MacBook on an inverter.

As far as I know the fridge uses 65w and the Macbook charger uses 85w.

Thanks,

Dave...

Hi Dave,

A lot depends on the Fridge capacity(Litres) together with the Ambient Temps and Atmospheric (ie cloud cover)/Seasonal conditions when travelling camping. If a 90 litre fridge it would be the minimum Solar/Batteries you require. But if Larger fridge ie 220l at least 500 to 600 watts and 300 to 400 Ah Batteries required, I know this as our Van has this set up and worked ok with AGM's but after 5yrs converted to Lithiums and they give better bad weather operation. With the AGM's after a few Bad Weather days without travelling ie using Charging from vehicle via Dc-Dc Charger would have to run the Honda EU20 Generator for a good 4 to 6 hrs to bring batteries back to 100% Charge.

Hope this helps some.

Cheers Kev.

Gday...

Firstly, welcome Dave+Addy

I have found the attached Excel spreadsheet very handy when I was trying to understand/calculate my solar needs a few years ago.

I did not develop it - it was made available on another forum I am on.

Cheers - hope it gives some help.

Cheers - John

Hi Kev,

Thanks for your reply, the fridge is 140L so I guess a few days is my limit, I will also have a Honda EU20i so I will be able to top up like you did.

Cheers,

Dave...

Hi John,

Thanks for the welcome

I have downloaded the spreadsheet and will be having a god look at it shortly, thanks a lot for that.

Cheers,

Dave...

Yes, thanks Richard Graylin 

Dave...