I'm trying to diagnose a possible problem with a solar panel on a
motorhome.

The charge controller - NDS Energy Sun Control SC 15-240 - is supposed to
charge the habitation battery, and then switch over to charging the
vehicle battery.

This thing:
https://www.ndsenergy.it/prodotto/suncontrol/?lang=en

Manual (such as it is) at:
https://www.roadpro.co.uk/userfiles/...ion/NDS/C5621%
20Manual%20for%20NDS%20regulator%20SC15-240.pdf

Now it seems to have charged the habitation battery, or at least is happy
that the habitation battery is charged, because the LEDs show that it is
only charging the vehicle battery.

Habitation battery is at 13.8V, vehicle battery is showing (through the
Sargent EC450 controller) charging at about 0.2A with a voltage between
14.5V and 14.6V.

I think that the solar panel should no longer be charging the vehicle
battery and that there may be a fault on the controller.

However the PDF manual gives 4 charging modes:

"
A) Charge curve for €œGEL€� battery
B) Charge curve for €œFLOODED€� battery
C) Charge curve for €œAGM€� battery
D) Charge curve with limited voltage max 14.5V"

This makes me wonder if, where you have a different type of battery in the
vehicle and the habitation, perhaps a Gel in the habitation and a standard
lead/acid ?flooded? battery in the vehicle, if you need to use the voltage
limited profile (D).

So is the solar controller behaving correctly?

If the solar controller is behaving correctly then there might be an
interaction between the solar controller (happy to float up to 14.6V at
low amperage) and the Sargent controller cutting out because an over
charge has been detected.

Ah! Sun has just come out and 15.8V showing for the vehicle battery. Now
that can't be right, Shirley?

Cheers



Dave R


--
AMD FX-6300 in GA-990X-Gaming SLI-CF running Windows 7 Pro x64

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