Technical Steca Solsum 6.6X control panel

[Robert56]

I found a blown fuse on my Steca Solsum 6.6X' solar panel control unit. I replaced that and it is now charging the leisure battery in my Fiat Ducati camper van. However the charging voltage across the battery terminals is 15.3V which I believe is excessive. When I removed the feed fuse between the 6.6X and the leisure battery, the battery feed voltage rises to 19.75V as measured at terminals on the 6.6X.

Does anyone have experience of this solar power controller and can advise whether the unit may be faulty?

 

[NeilDD]

Whilst I do know much about the Steca range of solar controllers a quick google shows that depending upon setup the same controller can be used for both 12 and 24V.

It is not unusual for the output of the solar panel (Voc) to be up to 25V, and the controller regulates this down to your nominal 13.2 V for lead acid batteries and 14.7 for Lithium LiFePo4 types.

If you are confident with electrics, I would look at putting in a modern MPPT controller from someone like Victron which is almost plug and play.

If you can provide a little more info on;
1/ Solar panel size
2/ Make and capacity of your habitation battery
I can make a better recommendation

Cheers
Neil

 

[Robert56]

Thanks Neil
I bought the van with the Solar already installed but I’ll have a hunt and see if I can find any info on the solar panel.
I have just fitted a new habitation battery which is a Varta LED95 so 95Ah.

The 6.6X is rated at a maximum current output of around 6A