How To Properly Fuse A DIY Solar Panel Array

Learn how to properly fuse a DIY Solar Panel Array by watching this video. In the event that your solar array needs to be fused because the Array Short Circuit Amperage is greater than the Panel maximum series fuse rating - you must fuse your array at the point where the panels or series strings get combined to prevent potential fires or overheating due to a faulty panel.
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[@offgridstores]

First Time Customers Get 10% Off Their Order With Code "10%NOW" At Check-Out Items Used In This Video: 100W Solar Panels: offgridstores.com/products/rich-solar-100-watt-solar-panel-rs-m100 2 To 1 Parallel Connectors: offgridstores.com/products/rich-solar-y-branch-parallel-connectors MC4 Inline Fuses: offgridstores.com/products/rich-solar-inline-fuse-holder-with-fuse

[@aunttriciaattic]

Thanks for the video. This is the first time I have ever heard anything or seen anything about fusing solar panels like this.

[@GottaLoveGoats]

Exactly what I needed to know. Thanks for the video!

[@jerrym995]

how about when in series/parallel?

[@alanblyde8502]

Great explanation mate, I’ve seen many other videos trying to describe this and it’s clear and concise 🇦🇺👌

[@danielthomas8569]

This is good news for me this is the set up I'm going to use for my greenhouse. Thanks for your help.

[@offgridstores]

Glad to hear it! You’re welcome

[@marks2254]

Thanks for the info. Great video. If you do blow a fuse, does that mean one of the panels is bad and needs to be removed from the system? Or do you normally replace the fuse and go on your way? Is the bad panel the one whose fuse blew or the other one?

[@johnharrison2511]

Good questions. Maybe it's whichever fuse gets the overload first, is the one that blows ? A grounding cable might also be good. There are special bolt and nuts for that purpose, so maybe ?

[@johnharrison2511]

The jiggling around was a bit discombobulating. A clear diagram, or table top steady shot would be good. So, as far as i can understand, every positive cable coming out of a parallel set up panel, needs a fuse, rated to the short circuit amperage of the panel, multiplied by the number of panels. Fuses installed on the positive cable, before that cable is entered into any joiner. So, if the panel cables are in any way too short to reach the joiner ( having been cut short by impatient person removing panels from previous installation etc), then the fuse installation is a good opportunity for extending the cable length, for a necessary purpose (fuse). If there are say, five panels at approximately 6 amp short rating, then 5 of 30amp fuses would be needed. One 30 amp fuse for every panel. To cover the accumulated amperage (current). I am guessing it would also be good to run a grounding cable to an earthing spike as well ? Thanks for making this video ☺️🙋

[@anotherbrickoutthewall9237]

I have a 200w renogy solar panel going to a renogy 50amp dc to dc with mppt would that need a fuse on the positive cable and if so what size fuse? Thanks for the video just trying to get my head round it

[@jonnytacooutdoors]

Thanks so much for all the great information!

[@offgridstores]

Glad you liked it!

[@WoodandWild]

Hi, thanks for the very informative video. Just out of interest, why do you place the fuses before the branch connectors and not afterwards? Just I noticed alot of places like Renogy specify placing fuses after the branch connectors. Does it mean that in the case of a short circuit and the fuse is blown, that just the one panel would stop working rather than all 2/3 tied into that branch? Many thanks in advance! Joe

[@johnharrison2511]

Yes I wondered the same thing. For my 5 panels I would need 5 fuses, of maybe 30 or 40 amps rating. As opposed to just one after the 5 branch connector. Maybe it saves shorting out the other 4 panels ? Which would be good.

[@bestillandknowthatuaregod]

What Fuse Size for 150W Solar Panel - ISC Amps 8.76 should I use? THANKS

[@oranusichigozie5219]

In series use 8.76 X 1.56

[@SinbadSailing]

So when the fuse of the faulty panel is tripped there is no increase in amps from the remaining (parallel) panels because there is no path!

[@hopeuluv979]

Thanks for making this video.😊

[@airfoil]

Thanks for simplifying these connections, I'm building a small off-grid solar system and this is going to be very useful. However, I have a couple of questions w.r.t, a parallet connection setup: 1. Wouldn't the diodes on each solar panel prevent the entry of current into a panel that has shorted? 2. In a parallel setup with 3x 200W panels with a max current of 9A each, if I were to put in a 15A inline MC4 fuse, would the current from the other 2 panels (18A total) possibly reverse flow and blow the inline fuse which is rated at 15A? Thanks for your replies, cheers!

[@johnharrison2511]

Pretty sure 3 X 9= 27, meaning a 30 amp fuse on each positive cable, but not sure. Just going off what the video said, but not many answers to questions so can't be sure.

[@joe84bmw]

I have one panel that’s 15a and came with the rv and adding two more that are 20a rated. All are renogy 200 watt panels, would I use a 15a and 2 20a fuses or make them all 15a? Im not very good at this 🥴

[@johnharrison2511]

It's the short circuit amperage (current) rating that is used to calculate. Those amps are added up from each panel to arrive at a total. So if you had 3 panels at 6 and 6 and 8, then 20 amp fuses would be used for each panel, fitted to the positive cables, of a parallel connection set up. That's what I understood from this video. I could be wrong.

[@davebenz8271]

“Short-circuit amperage”, not “Short-circuit voltage”. Right?

[@offgridstores]

Yes amperage.

[@johnharrison2511]

Amperage is also called "current" which is different from voltage.

[@radstorm]

Thank you for this, and getting to the point. :o)

[@jacquelineMeyers-is1zz]

How much better if you had not made me sea sick with the constant weaving arround.worth reshooting it.

[@johnharrison2511]

Same here. I found it hard to focus and not sure where the fuse started and the connector ended.. A separate camera person would be good and probably a diagram.

[@panospapadimitriou3498]

does a diode work as a fuse..? because i ordered correct amps for my 240w pvs but not fuses ...they got diodes inside !!! my kyoceras are 10years old and i dont think they have diodes.. they used to be installed in series in a big park!!!

[@ONAHANDSON]

Must 2 panels in parallel be fused?

[@debbiedogs1]

Connecting in parallel adds amps together from all panels, so fuses are the best idea. Connecting in series keeps amps the same as just one panel, but adds volts of every panel in series, so there are different factors involved with each configuration. There are other videos about this, one of the clearest I have seen is by Jason on the Jasonoid channel. kzbin.info/www/bejne/hYvZo4erna-bjtU

[@juandelacruz1520]

Solar panels are more like a battery when discharging to a load

[@Supanova70]

Ok so if i got this right i have 2/100w panels @5.5 a short circuit ratings each. A 10 amp fuse each panel is what i need wired in paralell?

[@johnharrison2511]

Hmm..do we add them up, meaning 11 amps ? Should the fuse be below that or above that ? Hard to say.

[@Snailmailtrucker]

OK, so now how many volts is ok to have coming into my 12 volt battery bank ? I have 2 x 330 watt Solar Panels. I have 2 x 12 volt 100 ah batteries in parallel. My 330 watt panels are rated at Open Circuit Voltage at 41.0 volts, Open circuit current at 10.33 amps. I have an Epever 30 amp Solar Charge Controller. Thanks Liked/Subscribed !

[@markdove5930]

I have a question... I have a 300w solar panel and a 12v 50ah battery and for some reason it doesn't want to charge at more than a 100w. Is that normal?

[@johnharrison2511]

They say to have double the wattage for the amps of your battery. They also say that a 300watt panel might not give you more than 200-250 watts in reality, or less if it's cloudy etc..

[@cprpremiumhandymanservices3735]

Still have a headache have a Eco nomad kit with 2 x 200 watt panels with 1 fuse where does it go?

[@johnharrison2511]

Probably good if you mention the fuse rating.

[@cprpremiumhandymanservices3735]

@@johnharrison2511 hot of course just like a sterio old school boy talk about a senior moment lol

[@WiSeNhEiMeR-1369]

WOW !

[@perrymason8471]

Off topic, you sort of sound like James Franco.

[@MikelRae]

How would I fuse 4S2P 100 watt panels?

[@offgridstores]

The same way I described in this video

[@MikelRae]

The maximum series fuse rating on my panels is 12A. I can’t find a fuse of that size.

[@assortedmountainlife]

@@MikelRae Go with 10A then.

[@MikelRae]

@@assortedmountainlife That’s what I ended up using. Appreciate the response still though.

[@billisnice]

Buy Isc 15 amps panels.

[@mangeload]

How should I fuse in series? 4 x 100w panels

[@offgridstores]

You don’t need fuses if it’s 4 panels in series

[@mangeload]

@@offgridstores I know you don't need them, but I want to have extra protection

[@mangeload]

Maybe I'll fuse it as if it is one 400w panel?

[@mangeload]

Can you recommend a good dc12v circuit breaker?

[@alflores4220]

@@mangeload Renogy sells a 400-watt kit, they actually include a 10 amp in line fuse (and a 40amp ANL fuse too, but that fuse is for the controller to battery line not what you are asking about) On their schematic they show the inline fuse as going on the positive cable that is going to the controller. And that kit is four 100-watt Renogy mono panels.

[@Dave-xr9bc]

so 2 panels in parallel dont need a fuse?

[@perrymason8471]

They need a fuse. In fact they need a fuse rated for higher amps than the summation of all your solar panels's short circuit current amps combined.

[@johnharrison2511]

From what I can gather they both need a fuse. Lots of comments and discussion because a lack of informed answers.

[@OWK000]

So, this type of fusing would prevent the type of fires of Tesla panels on the Amazon roofs? Also saw a newish NewPowa panel on KZbin today and it was just starting to melt thru on one spot on the panel and the owner of the setup just had the panels leaning against the house, although plugged in, was still doing some changes, and so noticed before it started a fire and uplugged. If panels have more diodes than they used too, why do more new panels catch on fire? One other guy claims bird shit in a strategic spot can cause a fire. Long winded guy, got nothing out of that video: he didn't convice me. NewPowa panel was probably just a bad panel, so that doesn't prove anything.

[@MacGyver1946]

What a joke...even if you have a short circuit it won't blow a fuse. You really know how to confuse people and make it clear as mud.

[@johnharrison2511]

Yes you are right about the confusion. A lot more jiggling around than answers. I never encountered this fuse on every positive before. Was hoping for some answers to some questions as well. Maybe confusion, plus no answers, gets the comments right up there for the algorithm thing ?

[@ralph332]

Issc is very close to Imax!!!!!! WTF are you doing?

[@Just_An_Idea_For_Consideration]

Geez!!! Buy a tripod!

[@offgridstores]

Will do

[@joe84bmw]

I have one panel that’s 15a and came with the rv and adding two more that are 20a rated. All are renogy 200 watt panels, would I use a 15a and 2 20a fuses or make them all 15a? Im not very good at this 🥴