Renogy RBC50D1S-UK

[mikejay]

Hi i know lots of you are very clever and understand solar power stuff so few questions. Has anyone got the above dc to dc mppt charge controller? I fitted this controller along with a 200w shadowflux panel last week in the understanding when my leisure battery was charged it would trickle charge my starter battery. My setup consists of the above parts and a 190amp varta efb battery. New bits are so I can upgrade when funds are replenished to lithium. My problem is the manual says once my leisure battery goes into float mode it will then trickle charge my starter battery. My leisure battery has sat in float since last wednesday when fitted and no charge has happened. Renogy say my panel is not producing enough volts since it was fitted its been overcast and raining here in the northwest but the panels been producing about 36.5v today it went to 37.1v. Renogy have not told me how many volts it needs but the controller can only take 50v and other people with the same controller are saying theres chargers the starter battery. One sent me a screenshot his solar was on 39v and charging his starter battery. Here is a link to the manual pages 36/37 are about the reverse charging . https://uk.renogy.com/cdn/shop/files/RBC50D1S-G6.pdf?v=17945055452888564331

Also my dc home app only shows an engine icon charging my leisure battery during the day I have no solar panel icon showing charging as other users of the app.I know its all wired correctly as i have replaced my old mppt as it could not handle the new solar panel and replaced my ancient but still working sterling 121250 because of the plan to go lithium.

Thanks for any input Mike

 

[yeoblade]

I have the 30A version of this DC DC MPPT and it does work perfectly for me, as per charging Veh, bat. after fully charging leisure batts. Earlier ones only handles 24vdc solar input, like mine but I guess you have the newer model with increased V inputs. If it's wired correctly, then maybe it is faulty.
Sounds like fault finding by isolating inputs and see whats working or not, observing app and LEDs on the controller.

 

[mikejay]

Cheers yeoblade seen you had one when I searched. Have tried it all ways solar disconected starter battery disconnected. Have left it all disconnected to see if it needs resetting. It charges the leisure up from solar as it should and chargers up from the alternator as it should just no reverse charge. And this dc home app only ever shows the engine icon charging no solar panel icon. I suspect it's faulty but renogy say its because my panel is not powerful enough to output a higher voltage. These are my stats and that is the engine icon which always shows it charging while sunny. Others I have seen also have a solar panel icon for when solar is charging.

Thanks for the reply Mike

 

[yeoblade]

I think if you disconnect ALL the DC DC stuff and have only the solar very BASIC circuit and the Solar Icon on app (and LEDs on unit) are not working it must be faulty, is it new? Keep hassling Renogy for an exchange. The charging of the Veh. Bat is another issue, the basic operation whilst charging, solar Panel Icon, needs to be correctly displayed.

 

[mikejay]

Yeah solar panel and dc dc charger delivered from renogy and fitted last week.

 

[merl]

Hmmm sounds like a faulty unit to me. Wouldn't surprise me, I had to return my first Renogy DC-DC charger because it stayed in Absorption charge mode and never tripped into float. Similar story to you with Renogy trying to fob me off, second unit performed very differently.
I take it the starter battery voltage is less than 13.2V because above this the unit wont charge the starter battery.

 

[mikejay]

Yeah starter battery is on 12v near flat which is why I wanted the trickle charge option as I don't use my van often enough. I have requested an rma and full refund going to buy victron separates.