Solar Panel

I would like advice as to what power of solar panel would be needed to maintain both vehicle and leisure batteries in our 2008 Nuevo.
They are both lead/acid but I am leaning towards lithium for the leisure.

Not much roof apace , I have 100 w on my nuevo my sargent 328 Is restricted to 120 w

Exactly the same solar system set-up as Ian but with 100w panel. Van in storage site without access to EHU. Both batteries now 7 yrs old and even in the winter months, remain fully charged.

With solar put the largest panel on the roof you can get up there , but if you are using the inbuilt Sargent solar regulator this is limited to 120w panel size and only a PWM regulator

Our Rienza was fitted with a 130W panel and a second 100 amp leisure battery when we bought it seven years ago 
The first improvement I made was to fit a battery master. Recently I changed the solar controller to a Victron and improved the wiring. Last year I replaced both leisure batteries. 
 During the winter I can use the hook up to keep the batteries topped up but most of the year we rely on solar. The two things I think make a big difference are the Victron controller and battery master. Even during this winters grey days the batteries have been topped up.

IanH wrote:....
We very rarely use EHU not even here at home, solar does everything.
.....

Do you use your van in the winter in UK with just the 130W solar panel i.e. no EHU?

Likewise for us during the winter. Having the two 100 amp hour leisure batteries gives us a lot of reserve but we generally have the WiFi thingy, tv, heater fan, lights and small odd and ends on at a time. 
Using pub stops a lot in the winter at the most for two nights we can last that long. Our biggest restriction on time is how long our water will last rather than running out of electricity.

Thanks IanH & Dave 418.  A key difference is that later vans like ours have an EC700 power control system that uses at least 7Ah per day and cooker with a cooling fan that goes on for ever.  Even locking and unlocking the van consumes power as the lights flash, the awning light comes on and the step goes in and out.  I also have an automatic leveller.  Currently we only have a 90Ah LB, although the box will take 115Ah, and an 80W solar panel albeit now with an MPPT controller.  We use our van differently.  At this time of year we expect to go to a hard standing pitch and not move for 4 or 5 nights, so no alternator charging. Fortunately hard standing pitches come with an EHU which we make full use of for the fridge, kettle, microwave, hairdryer, to heat the van continuously to either 14 degrees or 20 degrees, to provide hot water on tap for daily showers and washing up and to allow the fresh water tank heating pad to be used if the temp is well below zero.  If I didn't use an EHU at this time of year, the microwave and hairdryer wouldn't work and I would end up with an empty LPG tank, possibly a frozen tank, a very flat LB and a very unhappy wife!

Impressive.  My set-up will only do this in the winter when the van is out of use with the EC700 shutdown.  We only use sites and only use grass pitches in the summer and some don't always have an EHU.  So for us off-grid is an occasional summer exercise which our current set-up is able to do, now I've changed the controller.  If I want to speed up the daily recharge or make it more guaranteed, I might go for an extra panel but am undecided.  When the 90Ah LB packs up I will replace it with a 115Ah because I can but don't see any need to go higher than this given the way we use our van.

Do you find going off-grid in the winter means you are constantly having to resupply your gas?

Thanks.  I may have a go at using gas for heating next week.  The pitch has a metered EHU.  More than 10 units a day and you have to pay extra and I am sure gas will be cheaper.