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Abstract. Electrochemical, optical and thermal characterisation of a proton conducting polymer system based on poly(2-acrylamido-2 methyl-propane-sulfonic acid) (Poly-AMPS) for use in electrochromic windows .is reported. The polymer electrolyte has been obtained by cross-linking branched poly(ethylene imine) with the 2-acrylamido-2 methyl-propane-sulfonic acid.The conductivity of the poly-AMPS films is influenced by the water content in the membrane and can vary between 10 .4 and 10 -7 f2 -~ cm -~. A minimum activation energy of 17+_3 kJ/mol is estimated by a simple Arrhenius model. Poly-AMPS is very sensitive to the humidity in the surroundings and electrochromic windows should be sealed if poly-AMPS is used. Temperatures above 45-50 ~ give increasing cracks in the polymer and loss of adhesion to the electrode surface.