View attachment 42475View attachment 42473Right I’ve been looking at the screen from the app connected to my controller I’ve took a screen shot but don’t understand the numbers and how this converts it all seems to be working fine but the read out in watts then the
battery is volts then the read out in amps don’t know how to put this all together.
Ok, basic rule is Watts = Volts x Amps.
So the
Solar panel is putting INTO the Controller 2.2A at 24.25V. That is 53.35 Watts. This is the number that is showing in the circle above the bar graph.
The Controller is then putting 3.5A at 14.26V INTO the
battery. That is 49.91 Watts.
The difference between the two are the losses in the Controller. This numbers above make the contoller around 93% efficient - so in other words for every 100 Watts the
solar panel brings in, only 93 Watts make it into the
Battery - that is pretty respectable.
You are also seeing the benefit of an MPPT controller over a basic
PWM controller. An MPPT controller will convert excess voltage (anything above the 14.26V) into current - hence why the Current out of the controller is so much greater than the Current into it. With a
PWM Controller, that excess would just get ignored.
On the bar graph, the different shades show how much of the harvested power goes into the
battery at the different charge states.
the Solid White Bar is when the
battery is in Bulk mode (typically under 85% charged); the Lighter Grey is when the
battery is in Absorption mode (between 85% and 100% charged); and the darker grey is when the
Battery is in Float Mode (fully charged).
So you are seeing on the 6th Feb the
Solar input is very low, but this looks like becuase the batteries started the day nearly full. from the 7th, the
solar was much more active as the batteries could take more charge. on the 7th, you had enough power to fully recharge, but on the 8th you never got past the bulk stage so your batteries were not more than 85% charged at best.
On the 9th, you got to the absorption stage around 1PM as the bar changed colour. You can tell your
solar is actually putting in more power than you are using as the mode changed from Bulk to Absorption at that time and your batteries at 1PM hit around 85% charge.
The Totals in kWh won't show a number until you get more of a charge history total.
This is my info, with the same
Victron Controller type as you have and showing the same type of info, just in a different system
MPPT-Instant by
David, on Flickr
You see the total power in Watts (197W) - this is the same as multiplying the Voltage x the Current
It also show the Total Yield in kWh (169.37kW) - this is what the Controller has put into the
Battery over time; And the System Yield (183.49kW) - this is what the Panels have harvested over the same time. If you divide Total Yield by System Yield here, you get 92.3% Efficiency in the conversion process over the overall installation time (the efficiency varies on size of harvest - my 'instant' efficiency in the screen shot above is actually over 97%)
Hopefully all the above makes sense?!
