Foretravel Owners' Forum For owners and Fans of Foretravel Motorcoaches September 08, 2025 ...

I have no experience with Renogy, other than that they have a good reputation.  However I do have over 15 years of RV solar experience.  Before buying the Renogy Kit, I would check out a similar kit with identical  panels, $550, $90 less than the Renogy kit,

Amazon.com : HQST 400 Watt 12 Volt Monocrystalline Solar Panel Kit with 40A... 
and a kit from Rich Solar of 400w ($680) and 600 watt ($900), both with free shipping, and also check out the Victron SmartSolar controllers.  600 w Rich Solar kit uses 1 less panel (3, 200w panels) and gives you 50% more capacity for $260 additional over the following Renogy 400w kit for $640.

400 WATT SOLAR KIT 40A MPPT CONTROLLER — RICH SOLAR

600 WATT SOLAR KIT WITH 40A MPPT CONTROLLER — RICH SOLAR

Solar Kits — RICH SOLAR

Is the following Renogy 400 kit the one you are considering?  A link to the one you are looking at would help answer your question.  Send me a personal message on the FT forum if you would rather discuss  this on the phone or by email.

This is one Renogy 400w kit for $640.
Amazon.com : Renogy 400 Watt 12 Volt Premium 4 Pcs 100W Panel+40A MPPT...

My recommendation would be to get a Victron SmartSolar controller from Bay Marine direct or on Amazon, at your selected power starting at $226, which will take you up to 440 watts, and possibly going up to the 50 amp unit ($324), with a capacity of 700 watts, or larger capacity controller for future expansion. 

Along with increased capacity controller you will want to oversize wire to controller from your roof to minimize in the future having to resize. 

My reason for recommending Bay Marine are many, primarily if you ever need warranty or an RMA.  I would source your panels locally, used or new, approx 300 watt panels might yield more for your money than the Renogy  or Rich Solar kits.  They are often found locally for $125.  Solar wire from Rich Solar assures you of getting the proper copper wire and not copper coated aluminum  wire at a reasonable price.

Victron SmartSolar MPPT 100/30 Solar Charge Controller with Built-In Bluetooth

Victron SmartSolar MPPT 100/50 Solar Charge Controller with Built-In Bluetooth

Also, this is an excellent addition for $131 to know your batteries state of charge, using your phone with Victron application.  You will appreciate being able to measure and and monitor your usage and needs.
Victron SmartShunt Battery Monitor

Only you know your needs, budget, and experience along with desire to select your own combination.  The Renogy  kit may be a good jumping in point, possible may be your forever system.  For years I traveled with only 150w on both my Monaco Signatures, supplementing with generator and plugging in to shore power.. The FT I started out with 560W, (2) 285 LG panels in 2017, soon went to 1200w adding 2 more LG 335 panels, and a little later went to 1800w adding (2) 305 watt used panels purchased both for $110 each delivered.

If budget is this important to you, HGST has the same panels as you get in the Renogy kit, however, they are by HQST and you save $90.

Going to (2) higher power, approx. 300 watt panels would be my first choice.  Also realize that you do get some benefit from higher end panels such as LG when compared to Renogy.  For example the wind rating of a LG Neon2 335, like I purchased, is double that of a Renogy 300 watt panel, the LG costs about $35 more.  Since I have two LG 335 Neon2 panels mounted at the very front of my RV, this one feature was important to me.
Amazon.com : HQST 400 Watt 12 Volt Monocrystalline Solar Panel Kit with 40A...

Now a LG 365 watt panel is only $335.
LG Solar 365 Watt NeON 2 Solar Panel, Cello technology - Black Frame -...

Pictures of my 40' U295 roof.
1200W Solar on 1997 Foretravel U295 4000 - Google Photos