a new status is needed to communicate that no update was sent to the
inverter because its power limit is still valid. in this case,
calculating a new power limit is delayed by an exponentially increasing
backoff. the maximum backoff time is ~1s, which is still plenty fast.
the backoff is actually necessary for another reason: at least
currently, a lot of debug messages are printed to the console. printing
all that information in every DPL loop() is too much.
the unconditional solar passthrough mode, configured using MQTT, works
differently than the normal mode of operation. it is also independent
from the power meter reading. if this mode is active, a shortcut is
taken to a function that implements the actions for this mode. this is
convenient since we don't have to consider special cases in the code
that handles normal mode of operation.
the DPL already took care to shut down the inverter if anything fishy
was going on, mainly to make sure that the battery is not drained.
however, some cases were missed:
* if the configuration changed such that another inverter is now
targeted, the one the DPL controlled previously was not shut down.
* if the configuration changed such that another inverter (different
serial number) was configured at the same index, the previous one
was not shut down.
this change corrects these problems by making the DPL keep a copy of the
shared_ptr to the inverter. the shared_ptr is only released once the DPL
shut the respective inverter down.
this implementation checks all requirements for a new power limit to be
calculated, one after the other. if any requirement is not met, a
respective status is announced.
status messages are communicated on the (serial) console. these can also
be displayed easily on the web app in the future. the status texts
explain clearly what the DPL is currently doing, which aids
understanding how the DPL works. the status is only announced if it
changes, or after a fixed interval.
as each requirement is checked individually, the code readability is
improved as well. previously, all the respective conditions had to be
checked as well, but the statements were more complex.
the DPL loop is now executed with high frequency, i.e., it does not wait
for a fixed timespan to pass before checking requirements. it always
aborts on the first unmet requirement. this should improve responsiveness,
as the DPL checks all requirements more often.
the DPL now waits for all power commands and power limit updates to
complete. when that is the case, a settling time elapses. after the
settling phase, the DPL waits for a new update from the inverter and
from the power meter. now it can be assumed that the values are in sync.
it then makes sense to calculate a new power limit immediately, which
the DPL then does.
there is no need to assume and hardcode a fixed efficiency for the
Victron solar charger. the charger reports the voltage and current at
its battery terminal, which can be used to calculate the charger's
actual power output.
the fallback to 100% for the efficiency of the Hoymiles inverter, in
case it is not producing power, is too optimistic. this commit proposes
to use 96.7% as the efficiency for that case, which is the peak
efficiency for many (all?) Hoymiles inverters as per datasheet. that
value should be closer to the real efficiency that will be achieved once
the inverter is turned on.
* Power limiter: Use the actual AC power for limit calculation
instead of the last set limit.
In order support setups without battery connected (sources that don't exhaust the limit)
