I have a 48-volt renewable energy power system in my house that is presently off-grid. It has: - a 6kVA inverter/charger that can connect to a generator or the grid (charge controller #1) - a 2kVA wind turbine with a built-in 48 volt controller - a 3kVA solar panel system with a 48 volt charge controller - a 1kVA water wheel that simply adds power to the battery bank through a 3-phase rectifier. These are all connected to a single 820Ah flooded lead-acid battery bank.
We have noticed that when the generator is running and charging the battery and the wind is blowing, we see the wind turbine switching from 'charging' to 'not charging due to high voltage' and the voltage of the system increasing.
It would seem that perhaps the charge controllers are competing with each other, each raising the voltage against the other until they hit a cut-off and then repeating the process.
As a result, should the charge controls be coordinated in some way so that only one charge controller is actually charging the battery at one time?
Obviously this is not ideal, because I'd like to be able to charge the batteries with all the available power if the sun is shining, and the wind is blowing etc.