Being given a 300w Solar panel (1 Viewer)

Oct 9, 2019
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I am being given a 300w solar panel which will fit on my van roof, question is will my Victron 100/30 MPPT be up to the job and do I did to worry about thickness of cables and a fuse? The existing wiring is fine for my 180w flexi panel which is getting to the end of its life.
 
Sep 29, 2019
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The Victron should be fine up to 30amp I think. My 275 watt has given a max of 21amps in full solstice sun so should be fine.

What size are the cables? My guess is they will also be absolutely fine unless they are already right in the edge of what they will do.

It also depends how long they are.
 
Apr 27, 2016
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No fuse necessary on the solar panel wiring, but you may want to switch it off occasionally, so a fuse or switch is a good idea for that purpose. A solar panel isn't like a battery, if you short-circuit it the panel spec Isc will tell you what amps will flow, usually a small amount above the Imp amps at maximum power.

On the battery wiring, you will need to increase the fuse to at least 30A, probably 40A, and check the wiring can take 40A without overheating too much.
 

Lenny HB

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Oct 18, 2007
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The 100/30 can take upto 440 Watts of solar.
The wires to the controller will probably be OK if they are at least 4mm sq. A bit of a loss is not worth worrying about as in summer the output will be high so a little bit of loss will be negligible and in winter with low output it will be tiny.

For the controller to the battery if it is less than 2 m, 4mm sq will be OK.
 
OP
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Otter Spotter
Oct 9, 2019
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The 100/30 can take upto 440 Watts of solar.
The wires to the controller will probably be OK if they are at least 4mm sq. A bit of a loss is not worth worrying about as in summer the output will be high so a little bit of loss will be negligible and in winter with low output it will be tiny.

For the controller to the battery if it is less than 2 m, 4mm sq will be OK.
Distance from controller to battery is around 3m will 4mm still be OK if not what should I replace it with ?

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Stealaway

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Jan 8, 2013
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Is it domestic panel? What's the voltage coming out of the panel? It's might be an issue with a standard van solar controller
 
OP
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Otter Spotter
Oct 9, 2019
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Is it a domestic roof panel ? they tend to be a higher voltage and might not work with your existing panel
No, it’s for a van, a friend bought it for his van but he decided to sell his van before he fitted it and he doesn’t know when he will get another van.

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Jan 27, 2018
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the Victron can take much higher voltages than expensive chinesse devices. No problem with domestic panels. The Votronics is limmited to 50V but for last 3 years had no problem with my 48V 330W panel.
 

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