Yikes! Solar panels and Inverter/Battery Backfeed Into Duplex Receptacle!

GoldDigger

Moderator
Staff member
Location
Placerville, CA, USA
Occupation
Retired PV System Designer
A good fraction of the ones that work claim to use MPPT optimization on their input but actually just fake it


Sent from my Pixel 4a using Tapatalk
 

tortuga

Senior Member
Location
Oregon
Occupation
Electrical Design
I never really doubted that those cheap eBay grid-tie inverters worked, I've just doubted how long they would work for.
Right? It was a few years ago now back when you could meet in person, AFAIK it is still up on the PV guys roof plugged into a GFCI, ill have to ask him what happened with it.
 

pv_n00b

Senior Member
Location
CA, USA
Another problem that is less obvious is that GFCI receptacles and breakers are not listed for back feed. Plugging this into an outlet on the patio would mean using a GFCI circuit. If the GFCI tripped while the PV was back feeding it would burn out the electronics that make it work. The outlet or breaker could be reset but it will not trip on a low amperage ground fault.
 

Flicker Index

Member
Location
Pac NW
Occupation
Lights
Grid tie static converters are "line commutated" and vast majority of them aren't even capable of black starting and plainly lacking the timing circuit to even do so.

Feeding power into a circuit such that it results in the production of exported power without working with the utility is a poor idea though. It will sometimes hurt you in your wallet. For example 10kWh of imported energy and 2kWh of exported energy means 12kWh passing through the "highway" and smart meter software can totalize it in a way that results in you getting billed for 12kWh of use.

If you have a very old school treadmill with mechanical transmission and no electronics, then you could do the same "back feeding" by putting it into generating mode by driving a motorcycle on the belt such that the motor turns into an alternator.
 
Top