You can specify a continuous or periodical source of energy for your servitor in the initial "programming" stage, when you describe how its powers and duties work. The power source should make sense for the servitor's nature and function. For example, a "guard dog" servitor meant to protect your home could be linked to a nearby ley line, but a stationary power source would make little sense for a "bodyguard" type meant to follow you around.
Using the sun as a power source is certainly possible, but remember this would make it weaker in darkness or on rainy days. If this is acceptable, go for it. I suggest using the power source in the activation ceremony. Cast the summoning/manifestation spell at high noon in full sunlight. Note that a continuous energy source does not remove the need for a large initial activation charge. The energy source provides maintenance costs only, not the initial "jump start."
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