Yes. For me this worked just fine, as the pwm signal is derived from vcc, and I expect current draw by kessil less than 100ma. We power Raspberry with 2.5 amp connection, Pi uses around 1Amp, rest is for these use cases.@Ranjib are you saying that the pwm signal is powered from the pi connection via vcc, and the terminal block is only a power supply for the V+ buss? I guess when looking at it as servo based that would make sense to me....
@Brad Cox what version of reef-pi are you running? Evidently I am running a now "old" version, although I will say it has been very stable for lighting.:)
