Hi I have Samartsolar MPPT 100 / 20
In the morning the sun is at the front of my building. In the afternoon it is behind the building
So I move the panels round. This moving seems to be an issue, why I don’t know
Today it has been mostly cloudy, so I’ve made 10 WH. I moved the panels round and again an issue.
The panels are producing 14v.i checked with a meter.
The regulator is only showing 6/7v
Any ideas?
So you have them in series giving a 28v Open Circuit?
When you test the panels they are ok, did you also test at the mppt terminals. Alot can go wrong in between.
I have 3 100w panels in parallel, giving 18v.
It works fine every morning.
The problem is every day, after I disconnect the panels and move them
I did test at the MPPT terminal there is nothing there.
I did find that one wire was loose at the terminal, fixed that no change
Does the regulator need a minimum current to start charging?
It needs a minimum voltage vbatt +5v as fredvduin has shown from the datasheet.
Then there is a connection problem.
What you may find in the morning with your battery depleted is that the battery is at say 12V and your panels can generate the required 17V to get started. Once started they have to stay 1V higher than the battery to keep working. When you disconnect them and try and restart later in the day, the battery will be at a higher voltage and may well retain surface charge for a while so it may be at 13.5V or 14.0V and the panels can not then generate the required 18.5V or 19.0V to restart.
You should consider connecting your panels in series, but I would advise caution because they are now getting to a higher voltage with 3 in series.
Another option would be to add some load on the battery to remove any surface charge and see if this reduced the voltage and allowed the solar to restart.
Thanks, will do.
Makes sense. It has been the same everyday.
I have a fridge running off this battery 24/7.
Right now it say 12.4v, it’s just about to get dark.
I don’t think it is a wire or connection issue, but I’ll change the cable to the regulator.
I’ll let you know tomorrow 
Hi
So today I used a different regulator with different panels,to ensure I get some power into the battery, although it has not really increased 12.4 last night and 12.4, the fridge is reading.
I put 2 100 panels in series, got 35v but the Samartsolar did not turn on, still flashing the blue light.
I added a 3rd panel got 46v then the Samartsolar turned on
Now I have a solid blue light
Only getting 4w input.
But we have very thick cloud.
At least I know the issue, so looks like in series for the winter.
