Polly, what size are your leisure batteries and solar panels? An inverter will really hammer your batteries.
If you are just looking to recharge things you are far better getting 12v chargers for your iPad and phone and a 12v tele is a good idea, far more efficient.
If we are away for awhile I use power packs for my iPad and phone and recharge the power packs when on EHU.
After all that waffling, I do have an inverter which we use for the toaster, but this would only be used in the summer months when the solar panels would have a chance of recharging the batteries.
PS. Without going into to much detail a pure sine wave will charge anything without a problem if the battery has enough power, whereas a modified one will not charge everything.