What other equipment will I need to add more solar panels and what is the max wattage for this charge controller?

this is a great start solar package. this is what i had. Rover 40Amp will allow approx. 6-7 100 watt solar panel. Each 100 watt solar panel at max will produce around 5 amps. So 6x5=30 amps; 7x5=35 amps, so these numbers of solar panels will NOT exceed or damage the Rover 40A (amp) MPPT solar charger. if you plan on expanding your solar array, buy more brackets and wiring (especially if you are doing parallel wiring) and more quality batteries (rec AGM or Lithium ion); buy Will Prose IV book on amazon! great resource.

Can this power an ac and refrigerator on a class a motorhome?

It would depend on your battery bank and inverter. Not so much the solar kit. How large of a ac and fridge and how often will they be ran? For me I run my fridge on propane. I try not to run the ac to much. For some basic info, I have 4 12v 100 ah agm in parallel. This gives me 800 ah. I run a couple of essentials 24/7. They do not exceed 1.8 amps. Ever. By batteries charge Fully off this system almost daily. They battery bank never never drops below 12.4 volts. I can run a 1500 watt fridge or ac about 5.5 hours. I’d you know the wattage of your appliances apply the following: Usage Hours = AH/(wattage/0.85/volts)

Is it ok to hook up the solar panels to my batteries and charge them at the same my time my rv is charging them?

Yes, the Renogy 400 Watt Kit can charge the batteries by the included Renogy Charge Controller and at the same time the RV can charge the batteries with the Renogy DC to DC charge controller when there is no sun light on the panels.

How many 100AH batteries can i connect to this system?

It’s not how many. What are you trying to do with the system. I have 500 watts sending in a charge to a 200 ah lithium battery. I use a 2000 watt inverter. Can do all I want except run AC on it. Solar will keep mine charge to a 100 % all the time. Hope this helps

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Description

🔋 Empower your space with clean, smart solar energy—because your power should be as ambitious as you are.

SMART SOLAR MONITORING - Stay connected anywhere with Bluetooth-enabled real-time system data up to 82ft away.
ULTIMATE SYSTEM SAFETY - Advanced self-diagnostics plus in-line and ANL fuses protect against overload, short circuits, and battery damage.
PLUG PLAY INSTALLATION - Pre-drilled panels and complete mounting & wiring kit make setup fast and hassle-free.
POWER YOUR OFF GRID LIFE - Generate 1.6-2.5kWh daily with 4 high-efficiency 100W panels—compact yet mighty.
BUILT TO BRAVE THE ELEMENTS - Durable corrosion-resistant aluminum frame and multi-layer encapsulation for long-lasting outdoor use.

The Renogy 400W 12V Premium Solar Kit combines four 100W panels, a 40A MPPT charge controller, Bluetooth monitoring, and a full accessory set to deliver reliable, efficient off-grid power. Designed for easy installation and rugged outdoor use, it produces up to 2.5kWh daily, supports real-time system tracking via app, and includes comprehensive safety features to protect your investment.

Specifications

Brand	Renogy
Material	Monocrystalline Silicon
Product Dimensions	41.8"L x 20.9"W x 1.38"H
Item Weight	56.4 Pounds
Efficiency	High Efficiency
Connector Type	MC4
Included Components	(1) Renogy 400 Watt 12 Volt Monocrystalline Solar Panel (2) 40A MPPT Rover Controller(3)Z-Brackets(4)Adaptor Kit(5)Tray Cable, (6) Bluetooth Module
Maximum Voltage	12 Volts
Maximum Power	100 Watts
UPC	816360028062
Global Trade Identification Number	00816360028062
Output Voltage	12 Volts
Manufacturer	Renogy
Part Number	400 Watt 12 Volt Off Grid Solar Panel
Item Weight	56.4 pounds
Country of Origin	Thailand
Item model number	400 Watt 12 Volt
Is Discontinued By Manufacturer	No
Size	400W Panel+MPPT 40A Controller
Color	Off-grid System
Style	Cables+Mounts+Fuse+Bluetooth Monitoring
Pattern	Kit
Power Source	Solar-Powered
Voltage	12 Volts
Wattage	100 watts
Item Package Quantity	1
Batteries Included?	No
Batteries Required?	No
Warranty Description	Panel: 5-year material and workmanship warranty.

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