Town Meeting voters Monday passed a pair of closely watched measures to regulate solar installations and fund 24-hour ambulance service. A solar bylaw, approved 97 to 27, defines solar farms, specifies placement of solar panels, and prohibits large-scale clearing of trees to make way for a solar system. The proposal for 24-hour ambulance service authorizes spending of $232,740. Debate at the meeting centered on an amendment offered by the Finance Committee to put the money in the selectmen’s budget instead of the Fire Department’s. Voters passed the article, with the amended wording.