Class-C 48v system:

[esands]

Being a newbie I have 2 questions I'm needing to get answered. I've been watching your videos and am very impressed with your knowledge.
Here I am asking my questions...

I would like to install the

Complete Mobile Solar Kit 3000W Output | 5000W PV Input | [Kit-E0010]​

I've seen there is a minimum VOC for the solar panels to work with the internal MPPT. No idea how to get to that VOC from the panels I'm seeing on Amazon.
I see some that look good that are sold in a pair 400 Watt each. it states that they are 12-24v I'd imagine 12v panels and 24 if in series.
Class-C has only so much room for the panels. Any recommendations?
The second question is what do I require to keep the Alternator from burning up... I've seen DC to DC chargers. But haven't seen a 48 to 12?

 

[sunshine_eggo]

The 120V needs to be Vmp, not Voc, so you need to be at a minimum of 160-170Voc to ensure the panels will deliver 120Vmp in hot conditions.

IMHO, that's the wrong kit for you. There are other options where the MPPT has no minimum, with a Voc max of 145-150V-ish.

This is an example, but it's not available in a kit:

Growatt 3kW Stackable Off-Grid Inverter | SPF 3000TL LVM-48P

The Growatt 3kW Stackable Off-Grid Inverter delivers efficient, scalable power—ensuring reliable energy independence and flexibility.

signaturesolar.com

 

[chrisski]

IMO because of roof shading with ACs and vents, high voltage systems are not ideal for rvs since shading one panel can kill everything. I prefer many panels in parallel,

I have 1800 watts of panels on my roof with four parallel strings. 66 volts output tops for a single string.

 

[esands]

Well like a newbie...
I didn't see how to get back to my post, So I've since purchased equipment.

1. EG4 3000ehv
2. 2 EG4 LL Batteries.
3. Victron Orion 48/12 -30A Converter.
4. Victron Lynx Distributor - Victron Mega Fuse 125A/80V as reamended by Signature Solar. Batteries and the Converter will be on this busbar.
5. 6 BougeRV 200W Yuma Solar panels.

Max. Power Voltage Vmp (V)

24±5％V

​

I did contact Signature Solar who confirmed that if I can't get enough voltage to power the onboard MPPT I can use an external MPPT.
An extra cost but I was convinced in the long run this 48v system will be a bit cheaper in the long run. I'm Moving to AZ until it gets two hot, then 4 or 5 months on the road in cooler temps. I also have property in Washington State that's off grid.

Now I may be an idiot but I'm hoping I can make this work. I'm thinking I can take whatever doesn't mount on the RV roof. I can get a port installed on the side of the RV and lay out the remaining solar panels in series adding them to the panels on the roof.

But as you can see I really don't know what I'm talking about. My knowledge for solar is all YouTube.

 

[sunshine_eggo]

click your own name and then click the number under "messages".

The 6X 24Vmp panels in series will probably get you there in all but the hottest conditions, but shading may kill voltage/production.