PV upgrade decision
Right to the point: should I upgrade to a bigger panel or to an mppt controller? More info for those that take the time to read: I have a 100 watt, 21 ish volt panel and a pwm controller right ...
Forum Discussion
Sunpower used to require their panels be positive grounded. If I'm reading the spec. sheet right this one does not require that. However, I'd verify for sure because it would probably be really hard to have a positive ground solar system in a negative ground RV.
there are quite a few controllers that are 'common positive' and 'control the negative' side of charge circuit
i don't remember seeing anything about 'grounding' the positive of the panels
common and ground are NOT always the same thing, in electrical circuits
grounding in a vehicle is the chassis, which by USA standards is negative
grounding in buildings is earth ground for AC power
Common in DC circuits is the common power or common return, the part NOT controlled
in a vehicle this is the Negative aka chassis
IF Sun recommends Grounding the positive of the panels
this would be in a commercial install and would be an earth bond for the positive side of the panels before connecting to a grid tie inverter,
this is lighting protection
the earth is Positive with respect to the Clouds
and has nothing to do with the actual electrical operation of the panel OR with mounting it on an RV
