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Panels have adjustable tilt, and fold up and store into my pull behind trailer.

In all actuality to be fair the NEC (National Electrical Code) states the fuse should be the max fuse rating on the back of the panel. I use Bouge mc4 fuses they are TUV and UL listed, and alot cheaper than most brands. Mine were 25 dollars for 4 compared to 45-55+ for 4 other brands of fuse.

New camping stakes coming today. Will also put some 1inch pvc pipe on the bottom of panels and small L brackets on outside corners to stake panels down, and to hold together when closed in suitcase position.

Well unless you buy cheap fuses. Some have a very high resistance. Again look for certified fuses, from either UL, or Unless the fuses are cheap. Some fuses have high resistance. Look for TUV or UL listed fuses that are certified.

It is better to run the panels in series, the higher voltage will push the current better. Votage is what pushes the current and its the only job it has. With the length of the wire run at 35ft. I would go with 8 gauge wire so you can upgrade panels later. There also should be no mc4 connections...

No, None so ever.

A 20 amp fuse on each panels positive lead is good. The problem with parallel is if one panel short circuits the remaining panels feed the broken panel and may catch on fire.

Its really not the cable you are trying to protect in a parallel panel arrangement. Its a panel that shorts then the remaining panels stop sending power to the charger and starts sending it to the shorted panel. The panel may catch on fire then. Only a fuse or circuit breaker next to the charge...

I do use mc4 and will always use them, especially when my warranty is no good if I cut off my panels manufacturers mc4...LOL

Of course not, TUV is probably better than UL. Any mc4 connections that are not certified are cheap knockoffs and should not be used. I still wouldn't use a mc4 connections between branch connectors and charger, especially with a 4-6 panel 600-800 watt parallel panel configuration pushing...

Plus only original mc4 connectors are ul listed and can handle 43 amps, those cheap knock offs are not certified 30 amp by anyone.

Yes but you really dont have to have waterproof connections, unless you have high voltage. And many people run parallel configuration that exceeds 30 amps as is mine. Anderson plugs have been used for years in 12 volt systems in the outside environment. For his 2-200 watt panels Anderson or mc4...

I used a 30 amp circuit breaker before the mppt charger, mainly just to disconnect. The mc4's after the branch connectors going into the wire to the mppt should be changed out to an Anderson or better connection than the mc4. Mc4 doesn't handle amperage well at all above 25 amps. This is not...

Ready to go just waiting to build a couple batteries. 400 watt panels fold into 2 sets and store in pull behind trailer. Adjustable poles, ground staked, 2,000 pure sine inverter. 50 converter, DC-DC mppt controler, new auto transfer switch.

I would use a combiner box but my panels are ground mounted and need to quick connection. So I have a Anderson right after combiner, and one at junction box at rv for disconnect.

Yes a nice wire wrap. Comes in three different colors.

Hooked up, just waiting for a little extra money to build a couple batteries. Panels fold together and go into 2 sets and go into trailer, also adjustable poles for tilt. Have DC-DC Charger, MPPT, New 50 converter, 2000 inverter.

Yes didn't think about the open voltage duh...

I was thinking from changing from parallel to 2s2p 24 volt

I understand running the 10 gauge wire with 80v. I'm running 12v and still old school as in current runs around the outside diameter of the wire. With this cheap 8 gauge 19 strand Chinese wire that I dont know the resistance per feet (and dont feel like measuring) I still want the least...

Panel array is 30 ft run.

I have the Renogy DCC50S rated for 25 volts and 600 watts. I have 4 Rich solar panels at 100 watts a piece. I was going to use all panels in parallel but then thought maybe using two sets of panels in series then parallel them. For 24v and 200 watts. What are the advantages and disadvantages...

Maximum series fuse rating is 15 Maximum series fuse rating is 15 amps. I've had people tell me to use 30 amp fuses, one on each panel ? 4 100watt panels in parallel.

Why if I am trying to protect my solar panel that has around 8 amps would I put a 30 amp fuse in it that is based on the wire size. Doesn't it make more sense to size the fuses in a parallel configuration to the output of the panels ? 4 - 100 watt panels parallel. One fuse per panel ?

Yes mine are also but I'm not splicing my main current feed with a mc4. I dont need the extra resistance from a cheap mc4 connection.

I think what Will was trying to say is a mc4 shouldn't be in between in the single string going to the mppt. Like cut your main current wire from your panel array to the mppt and add a mc4 connector. For my splice at the side of my rv in my main feed I decided to use this.

So do you have to trim some wire off the 8 gauge to fit the xt60 or should I just go with a xt90 ? No the mc4 is a mc4 no mater wire size. I just bought 8 gauge mc4 for my panel to mppt charger. You cant find it any bigger than 8 gauge in a mc4.

My dilemma is I have a extra large oudoor double box on the side of my rig. It has now mc4 connections with 8 gauge wire to the mppt. It's so I can quick connect solar charge wire and put panels out on ground (with custom stands) from inside my mini box trailer ( 350# converted all aluminum...

Just went ahead and ordered 30 ft windynation 8 gauge solar wire with mc4 instead.

Just seams like the typical mc4 connections are cheap and the female contact erea is small and very thin.

Wouldn't it be much better for someone to use these connections and pliable pure copper cable instead of typical low strand non pliable 8 gauge cable and MC4 connections for panel array to mppt?

Renogy DCC50S dc-dc charger and mppt. 4 panels parallel 400 watts.

10amp fuse on each panel ?

Yes my max voltage for the mppt is 25 volts. The panel erea is with a 25 ft. 8 gauge wires. Also just found a extra long 1y4, I think it should definitely be long enough if I lay the panels horizontally in pairs of 2 and the outputs facing in and probably long enough for side by side also. I...

If I run 4 panels in parallel will 1y4 be long enough to connect them all, or should I use 3-1y2's ?