OK been doing the neighborly hunt for another big charger nobody has anything above 6 amp so i'm thinking surely if I only want to test for 20 mins. at a time will the leisure battery itself not supply the extra amps if I connect my 30 amp and 15 amp in parallel? I can keep the DC cable length from battery to air con unit down to .5 meter or less if I lug all the stuff up on the motor home roof (battery, 2 x chargers and extension lead)
Could be a great firework display for the locals if it all goes wrong