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I am in the process of installing a 80watt solar panel on the roof of our Bailey caravan, which will replace the 4 folding suitcase panels we currently use. I will be installing a 10 amp fuse close to battery in the positive feed to the 10 amp solar controller but looking on the internet no one seems to suggest an isolating switch. I could remove the fuse but a switch inside would be more convenient. The reason for an on/off switch for the solar panel installation is that we have a motormover which is connected to the battery via a key operated isolating switch and when it is being used draws a lot of amps and I am thinking that the solar controller will see a voltage drop and to compensate will increase the output charge to battery, so in order not to put the controller under stress each time I operate the motormover I thought it would a good idea to isolate the solar installation whilst getting the caravan off the drive then isolate the motormover and then switch on the solar installation. Has anyone thought about this or am I being too cautious.

Thanks for the quick reply, I had thought about putting another isolator switch and using one key but I don't have the space to fit one, these new pwm controllers monitor the battery condition and alter the charge rate as required, but as you say depends on the sun (max 4.8 amps from the panel) I will probably use a 10 amp double pole switch mounted inside the wardrobe so I can isolate the solar power (sun permitting) from the battery compartment for when I remove the battery over the winter. A solar panel is on all the time, even covered up with a sheet polystyrenre while I am installing it was producing 5 volts. I bought the new 80w panel for £99.99 with free delivery, controller £14 free delivery, Sikaflex 291 £10 delivered, a pair of MC4 connectors and made my own aluminium brackets as they were horrendous prices on the internet, not bad when some kits for this sort of installation are over £300.