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Off-the-Grid Living in Brooklyn TEST BUILDING The Delta in Carroll Gardens, which has been built to run entirely on solar energy,is a showroom for a “net-zero” rental planned for Park Slope.added: Above right, Ronald F. Faia of Voltaic Solaire, the developer. By RONDA KAYSEN AS the standards for environmentally friendly construction rise, a Brooklyn developer has a new goal: renovate an apartmen…