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Old 05-29-2024, 07:11 PM   #1
wls
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stationary solar

I have 2- 205watt panels, that I'm going to mount utilizing steel post, and make it so I can swivel it, to follow the sun. It will be probable be 40' or so from where I'm parking the 5th wheel. My question is should I mount the controller right by the panels, or close to my battery bank on the camper? Thanks
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Old 05-29-2024, 08:34 PM   #2
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Close to the battery bank. More voltage loss happens there.
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Old 05-30-2024, 07:59 AM   #3
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You can wire your panels for higher voltage traveling into an MPPT Solar charge controller. The controller should be near your batteries. SCC to batteries is in the 12vdc range and more susceptible to line loss.
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Old 05-30-2024, 08:16 AM   #4
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thanks guys, if I wire in parallel, that will double the volts right? Thats where I have my controller now, I hook a SAE end into the side of the 5th wheel, going to the converter, then batteries.
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Old 05-30-2024, 08:17 AM   #5
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thanks guys, if I wire in parallel, that will double the volts right? Thats where I have my controller now, I hook a SAE end into the side of the 5th wheel, going to the converter, then batteries.

No, the other way around.
Parallel will keep the same voltage and double the current.
Panels wired in series will double the voltage and keep the current the same.

The higher current will suffer a larger voltage drop along the transmission path, which is why you want to use a series connection to double the voltage and keep the current as low as possible. Make sure the total voltage is within spec for what your solar controller can handle.
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Old 05-30-2024, 08:25 AM   #6
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what they said!

you can adjust voltage (series /parallel) and therefore amps in the wires from the panels to the controller

Controller to battery is FIXED voltage so the cable needs to be sized correctly for the distance and amps that the controller can send to battery

You can use a 120v extension cord with the ends replace to MC4 connectors between panels and controller.

unless you have a real power hungry usage fixed panels work well and the money you save can be used towards more panels or a better controller

I parked my trailer between two trees for 5 days panels were flat too
still got enough power to keep up with my usage.

Tilt them to be pointed at sun at at it's highest point...
If you need more power ... get more panels they are relatively cheap
got mine 370w for $175 each , New 9 bus bars from Facebook
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Old 05-30-2024, 08:25 AM   #7
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Thanks
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Old 05-30-2024, 08:31 AM   #8
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PS.... during the year as sun moves lower /higher adjust your tilt once in a while
shorter/longer stick will do


PS PS use wood for the frame much cheaper
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Old 05-30-2024, 09:09 AM   #9
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My open circuit voltage is 33 volts, so that would be double right, my controller that I have is rated for 50 volts, so I'll have to get a different controller, not a biggie.
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Old 05-30-2024, 09:26 AM   #10
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Agreed what everyone said about controller location. I'm lazy and already have controller mounted to back of Renogy solar suitcases, so I don't use a long wire run (20')and have 10ga. cables. Nice thing about the suitcases is you can adjust angle for time of year, and it is simple enough to move them throughout day to track the sun. Suckers are heavy though.
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Old 05-30-2024, 09:37 AM   #11
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get yourself a decent cheap MPPT
Amazon has a bunch of them
get the biggest you can ... 50 or 60 amp
then you can add panels until you reach the max

50amp can have 700-800 watts of panels

I bought this one from Amazon is again on sale for $85
https://www.amazon.com/Sunthysis-Con...9&gad_source=1
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Old 05-30-2024, 09:54 AM   #12
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My open circuit voltage is 33 volts, so that would be double right, my controller that I have is rated for 50 volts, so I'll have to get a different controller, not a biggie.

Or just spend a bit of money to buy large enough cables to avoid the voltage drop of the 40' run. If you're only using two panels we're not talking very high current or very large cables.
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Old 05-30-2024, 12:15 PM   #13
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Or just spend a bit of money to buy large enough cables to avoid the voltage drop of the 40' run. If you're only using two panels we're not talking very high current or very large cables.


I've got a 12 gauge extension cord that I can use. I do have 100' of copper wire, (10gauge) stiff.
So would my 50 amp MPPT that I have work, I'm worried about the volts, when I run the panels in series, could be up to 66 volts, the MPPT is rated for 50 volts, says it can handle 600 watts of solar(12vt) if I'm figuring this right.
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Old 05-30-2024, 12:16 PM   #14
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get yourself a decent cheap MPPT
Amazon has a bunch of them
get the biggest you can ... 50 or 60 amp
then you can add panels until you reach the max

50amp can have 700-800 watts of panels

I bought this one from Amazon is again on sale for $85
https://www.amazon.com/Sunthysis-Con...9&gad_source=1
that would cover my volts, may have to purchase one like that
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Old 05-30-2024, 01:20 PM   #15
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https://www.amazon.com/gp/product/B0...e?ie=UTF8&th=1


Nice flexible Windy Nation 20' cables are only 31 bucks. 10 gauge. Already have proper connectors. Only a dollar more than what I paid 6 years ago. An inflation miracle.
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Old 05-30-2024, 01:41 PM   #16
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My open circuit voltage is 33 volts, so that would be double right, my controller that I have is rated for 50 volts, so I'll have to get a different controller, not a biggie.
are you sure the volts are 50?
what is the brand and model #
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Old 05-30-2024, 02:09 PM   #17
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that would cover my volts, may have to purchase one like that

If you already own the MPPT, I don't see spending the money for another one. Since this is only a 40' run I see no problem running the panels in parallel. We're not talking about a 400' run from an array in a field next to your house. But you'll need to size the cables properly. 10 guage isn't enough. You should use 8 awg.

With panel Voc of 33V, I'm guessing a Vmp of around 27V, which means an optimum current of about 7.5A x 2 = 15A. For a 40' cable run with 10 awg cable, that would create a voltage drop of 1.4V with 15A flowing. 8awg cables will give a voltage drop of 0.89V.

So, figure out how much a pair of 40' 8awg cables are gonna cost and then weigh that against a new MPPT controller.

*These figures are estimates since I don't know your panel specs.
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Old 05-30-2024, 03:24 PM   #18
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If you already own the MPPT, I don't see spending the money for another one. Since this is only a 40' run I see no problem running the panels in parallel. We're not talking about a 400' run from an array in a field next to your house. But you'll need to size the cables properly. 10 guage isn't enough. You should use 8 awg.

With panel Voc of 33V, I'm guessing a Vmp of around 27V, which means an optimum current of about 7.5A x 2 = 15A. For a 40' cable run with 10 awg cable, that would create a voltage drop of 1.4V with 15A flowing. 8awg cables will give a voltage drop of 0.89A.

So, figure out how much a pair of 40' 8awg cables are gonna cost and then weigh that against a new MPPT controller.

*These figures are estimates since I don't know your panel specs.
rated voltage 27.2, rated current 7.6, short circuit current 8.2. Thanks
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Old 05-30-2024, 04:15 PM   #19
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get a more panels to up the voltage max out the controller
biggest question is what is your controller 50v is NOT very common for voltage
10g extension cord at 40foot would work you might loose some voltage... but that happens anyways if you get shade or clouds

3 panels in series = 84 volts

on a controller 100/50 like mine

a) the 100 number denotes the max volts ... DO NOT exceed this
b) the 50 is the amps that it can handle ... small string very hard to max out the amps and
even if you do all that will happen is the controller will dump some power (won't hut the controller)

what is your exact controller model and specs?
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Old 05-30-2024, 04:59 PM   #20
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get a more panels to up the voltage max out the controller
biggest question is what is your controller 50v is NOT very common for voltage
10g extension cord at 40foot would work you might loose some voltage... but that happens anyways if you get shade or clouds

3 panels in series = 84 volts

on a controller 100/50 like mine

a) the 100 number denotes the max volts ... DO NOT exceed this
b) the 50 is the amps that it can handle ... small string very hard to max out the amps and
even if you do all that will happen is the controller will dump some power (won't hut the controller)

what is your exact controller model and specs?
its a super cheap one, called giant of sun, I'll see if I can log in with my phone to put a pic on here. I'm pretty sure I'll have to get a different controller.
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