Solar Installation Upgrade from 200 Watts to 400 Watts on Our Travel Trailer (Series or Parallel ?)

Here's my video on our upgrade from 200 watts to 400 watts using 100 watt solar panels.

I hope you watch the whole video to see my mistake of wiring the panels in Series in the beginning of the video and then changing to wiring in Parallel for better performance of the panels. And go to the links I posted below to see the other videos I mentioned in the video.

Thanks for Watching

Note: Products I used and links to them are provided below.

Check out my other YouTube videos by clicking this link -
https://www.youtube.com/c/MichaelBracewellTheTravelTrailerGuy/videos

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Here are links to what I used:

High-Strength Rubber Expansion Nut, 10-Pack - (Well Nut)
https://amzn.to/2ZlAqyb

Renogy 100 Watt Panels -
https://amzn.to/3eM8ysy

40 amp Fuse -
https://amzn.to/38KNSx7

40 amp Fuse Holder -
https://amzn.to/3cGJZuj

8 Gauge / 8 Foot Battery Cables -
https://amzn.to/3rS87Ao

8 Gauge / 2 Foot Fuse Cable -
https://amzn.to/3tlkTYo

30 Amp Fuse -
https://amzn.to/3cJbgMO

Male / Female Solar Connector Ends -
https://amzn.to/3trxNnT

Branch Connectors Solar -
https://amzn.to/3cHPLfj

Crimping Tool -
https://amzn.to/30QEeEF

Solar Shut Off Switch -
https://amzn.to/3bRJ5Mf

Renogy 2000 watt pure sine wave inverter -
https://amzn.to/2NokG7K

4 Inch Eterna Bond Tape -
https://amzn.to/3vunscL

Dicor Self Leveling Chalking -
https://amzn.to/38NHc1b

Here's an option for a portable solar kit -
Renogy 100 Watt 12 Volt Monocrystalline Off Grid Portable Foldable 2Pcs 50W Solar Panel Suitcase Built-in Kickstand & 15Ft 10AWG Solar Extension Cable with Female and Male connectors, 1 Piece, Black -
https://amzn.to/3uEbU8X

Links to other installations mentioned in the video:

200 Watt Solar Installation - https://youtu.be/j4a9MkLRJN4

2000 Watt Inverter & Automatic Transfer Switch Installation - https://youtu.be/rkRzH0Ay1z0

Battery Installation (4 - 6 Volt Batteries & Box) -
https://youtu.be/1vm4w3BMq4I

Links to Other Videos By Others Explaining Series and Parallel:
https://www.gonewiththewynns.com/Sailboat-Solar-Series-Parallel-Shading
https://www.renogy.com/learn-series-and-parallel/
https://www.solarreviews.com/blog/do-you-wire-solar-panels-series-or-parallel
https://youtu.be/Tfd3Rn-iNPY

DISCLAIMER
The opinions expressed in our videos are our own or from a contributor. Before taking on any project or making a large purchase, we recommend you do your own research and consult a professional for advice. We are NOT liable for any damage to your RV or injury incurred as a result of following our tips, advice or instructions. We are not RV professionals or certified technicians. We are simply RV owners who work on our own RVs and have a desire to share what we learn with others. Be responsible and know your limits.

From Renogy Website - https://www.renogy.com/blog/should-i-wire-my-panels-in-parallel-or-in-series/
If you have an MPPT charge controller, you have the option to wire your panels in series or parallel. To determine which set-up is better, we would answers to a few questions:

1.What is the distance you will have between your solar panels and charge controller?
2.Are your panels going to experience any type of constant shading throughout the day?
3.What type of battery bank do you want to charge: 12V or 24V?

1. If your answer to this questions is longer than 20 -25 feet, we would recommend connecting your panels in series. When your panels are connected in series, the operational voltage of the panels is added together. If you are connecting two 100 Watt panels in series, and each panel has an output of 18.9 volts, you will end up with 200W (37.8 Volts and 5.29 amps under optimum conditions). The higher voltage helps with the voltage drop caused by the large distance and allows the amperage to reach the controller efficiently.

2. If you answered yes to this question, we would recommend connecting your panels in parallel. When your panels are connected in parallel, you add the amperage together, but the voltage stays the same. For example, if you have two RNG-100D 100 Watt panels, each panel will produce about 5.29 amps. Connecting these panels in parallel will produce 200 Watts (18.9V and 10.58 amps under optimum conditions).