Originally Posted by Sumner
I can see where that is a problem since it can't momentarily shut the alternator down like it can the slave controllers. Probably something could be done by them, but it would be complicated considering all of the possible combinations of what people might have. I would think this might be a problem with any controller that has to read the battery voltage.
How long do you run with the alternator up? Once it is off does the controller then kick back in?
We at times run a gen-set for 15-30 minutes and what you are describing is probably happening at that time. If we do run the gen-set it is during the morning or evening when sun angles are low anyway, so doubt it makes that much difference in our case.
I guess the solution is that you need to add more panels
so you run the motor
If Bluesky made an external controller for alternators they could shut down the field coil and turn off the alternator output. The big problem with alternators is when you remove the load without shutting down the field coil first such as turning a battery switch to off while the engine
is running. I would think that they have the basic regulator
technology available and just need to change the interface to the unit to control an alternator. They would also need an output module capable of handling the power from various size alternators.
With regards to how long I run my genset it is for a couple of hours/day. I'm currently having problems with my fridge and it's drawing about twice what it used to draw. I need to replace it but I have to liquidate some assets first. So at the current
time my daily load is about twice what it should be. The alternator is on all the time the genset is running, but because it reading the alternator voltage as battery voltage the charger
itself both throttles back prematurely and shuts down prematurely.
The charging algorithm in my solar charger
appears to have been designed by an engineer
who was reality challenged, so I never know what my real state of charge is (see my last post). The unit determines it as 100% charge by when it switches to float voltage. If it's at float it must be at 100% right? Except that it goes into float prematurely so it's not really at 100%, but somewhere in the low 90s and then it stops charging. The solar panels
essentially cannot get my batteries to 100% because of the idiotic charging algorithm. Since I have AGMs it is really bad that they never get a true 100% charge. They are only 3 months old and I'm starting to see indications of capacity issues.
I have no more room for additional solar panels
which aren't really the problem anyway. The problem is a fridge that needs replaced and a lousy charging algorithm in my solar
controller. When I had the pwm controller and a fridge that was working properly I often got to a real 100% charge by 12-1:00 anytime between the first of April and the end of september with no getset at all, at least on sunny days.