Dear Asobo, None of these variables marked as “settable” are actually working
to be able to be overridden via SimVar watcher or SimConnet. In addition there
is a severe fault with ELECTRICAL BATTERY VOLTAGE , if you set this variable
to any value the voltage of the battery is set wrong to a level much lower
than being set. This is breaking current addon’s that used to work, where
users could “re-charge” the battery and preventing other add-on’s I am working
on to be able to work properly since it requires batteries replacements, etc.
Would it be possible to look at this? what other alternatives I have if I want
to restore the voltage of the battery to it’s original levels? Thanks in
advance, Simbol
I can confirm that we are seeing the same issue with the battery recharge
option in our PA28s. Despite many attempts with different values and logic,
the voltage is always set to 8.8v instead of 12.0v. Assumed it was broken by a
conflict with the new electrical system.
Hi Martyn, Yes one of my beta users mentioned you guys were having this
functionality working before… and he then proceed to try it on your PA28s and
found the same issue I was explaining to them that I am experiencing. I would
like to find an alternative until this is resolved… SU9 is too far away if a
fix even make it on SU9. Regards, Raul
I have some experience with both the new electrical system in MSFS as well as
the old one in FSX. The issues described have been part of the sim since
forever. Together with the wrong calculation of essentially ALL the important
values (voltages are wrong, currents are wrong, resistances are wrong), the
only solution for now seems to be to ignore MSFS’ electrical system and build
your own. It’d be nice to see this fixed when Benjamin re-works the whole
system… Reminder: Millmann + resistances for batteries, generators and gpu
are the key for a proper simulation of the voltages and currents. 
Battery’s Internal Resistance, and how it varies with battery charge should
also be taken into account when calculating battery terminal voltage.