I am an owner of a very scientific calculator and I have a problem I burnt its charger and know I am in search of it. My calculator charger used to charge with the sun power. So now I am in search of solar power phone charger. But I am confused from where to get the solar power phone charger. What will be the maintenance cost of it etc? I really want to get them fixed in my calculator as soon as possible, is there way. Looking for suggestion and feedback.