Leisure Battery

It would be helpful to know what MH you have.  In any event you can't do better than deal with: Tayna

It’s a surprisingly big subject! However, Google will come to your rescue, there’s load of reference material on the web from the simple to the complex. Also CMC and Caravan & Camping Club sites have good technical notes on the subject. As well as obvious stuff like how much space do you have, a good starting point is to understand how much power you need and therefore the battery spec you require. For example, a 100AH battery will provide 1A for 100 hours, 2A for 50 hours etc, so a 12v appliance rated at 10A should give you 10 hours of usage assuming 100AH battery. Therefore, if you used it for 5 minutes a day it should last 120 days. On that basis you can get an idea of what’s needed for your requirements, but in reality it’s more complicated than that which is why some research is recommended if you’re serious about off-grid. What’s your solar panel output?

The Tayna site looks good.

If only it was that simple SB. Unless you intend to entirely deplete the battery, which will very quickly wreck it, the best you can get from a standard battery is about 50% of capacity.  

Senator, I suggest you join Motorhome Fun it is a mine of info and all the Funsters are really helpful.

Yes, as I said “but in reality it’s more complicated than that”.

In reality most people won’t deplete a battery as it will be subject to regular charging, solar, alternator or EHU - was trying to keep it simple.

If you are planning serious off-grid, then Lithium is the way to go, supported by a decent solar array.

While I have to agree that Lithium seems to be the way forward they are very expensive to purchase and from some accounts I've read they are not always compatible with the standard battery chargers.

Loads of us manage very well with a decent lead acid battery and solar panel set up. 

Leisure Battery Categories

Agreed.  

https://www.outandaboutlive.co.uk/caravans/articles/practical-advice/lead-v-lithium-leisure-batteries-a-caravanners-guide

Beware of 'AGM' and 'Gell' batteries also. They both need special charging conditions as well.

Perhaps he's looking for 'a Motorhomes guide'...?

gel, AGM and lithium are often OEM on top line MH and will usually have the charging profiles to match.

evaluating 'how much' battery capacity depends on ones usage rate, how long you're off grid, how quickly the solar array can replenish, and when solar is poor (winter) how long would batteries need to support the user before moving on and recharging etc, etc.

'normal' usage of (led) lights, water pump, charging iPhones etc is fairly easily supported by a 100w panel and a 100ah (max use 50ah) battery...

move towards running a hairdryer, Ebike batteries, microwave etc from a large inverter and the scale multiplies quickly...

I'm currently (no pun!) investigating why my inverter will not run my microwave from a nearly new 110Ah leisure battery.  I suspect the current drain is too high and am about to experiment using a similar sized battery from a Land Rover.