This may mean nothing to people in the USA.
I've seen my powerwall exporting power to cover the controlled-load hot water current draw. Since the hot water is on a separate meter, this means that the power goes out through the normal meter, counted as a solar export (at night!), and then back in through the hot-water meter, counted as controlled load.
Leaving aside that this probably represents a net cost, most people won't want their battery to discharge that way, since the hot water system could easily run it flat, leaving nothing to power the rest of the house later on during the night, or in the early morning at what is almost certainly a higher tariff.
The cause was that the current sensor was attached to the common incoming power lead, before it split off to go separately to the hot water meter and the main house meter. I got it moved to where it only sees the house current, and all is good now.
Something for people with off-peak hot water to watch out for.
Sylvia.
I've seen my powerwall exporting power to cover the controlled-load hot water current draw. Since the hot water is on a separate meter, this means that the power goes out through the normal meter, counted as a solar export (at night!), and then back in through the hot-water meter, counted as controlled load.
Leaving aside that this probably represents a net cost, most people won't want their battery to discharge that way, since the hot water system could easily run it flat, leaving nothing to power the rest of the house later on during the night, or in the early morning at what is almost certainly a higher tariff.
The cause was that the current sensor was attached to the common incoming power lead, before it split off to go separately to the hot water meter and the main house meter. I got it moved to where it only sees the house current, and all is good now.
Something for people with off-peak hot water to watch out for.
Sylvia.
