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  1. #11
    Join Date
    Mar 2010
    Location
    Ammersee, Bavaria
    Posts
    5,425

    Default Re: Solar panel replacement - does voltage matter?

    20180811_160055.jpg 20180819_142629.jpg

    Victron Smartsolar MPPT 100/30 with BT gives you detailed visual output for the last 30 days. I also have the Victron battery monitor (BMV 712) which also has BT output.

    If you download the android/iphone app "Victron Connect" you can fire it up and explore all the user interfaces and settings for their devices as it has dummy profiles for each device programmed into the app. Try before you buy.

    I installed mine in 2018 and it has been excellent.

    Most I've got out of my 300W panels in one day was 1,5kWh

    Solar300W.jpg
    The best argument against democracy is a five-minute conversation with the average voter.

  2. #12
    Join Date
    Oct 2010
    Posts
    1,503

    Default Re: Solar panel replacement - does voltage matter?

    Quote Originally Posted by Baggywrinkle View Post

    Victron Smartsolar MPPT 100/30 with BT gives you detailed visual output for the last 30 days. I also have the Victron battery monitor (BMV 712) which also has BT output.

    If you download the android/iphone app "Victron Connect" you can fire it up and explore all the user interfaces and settings for their devices as it has dummy profiles for each device programmed into the app. Try before you buy.

    I installed mine in 2018 and it has been excellent.

    Most I've got out of my 300W panels in one day was 1,5kWh
    I see the advantage but I'm more of a fit and forget person - but will see. I took the Victron battery monitor out of the boat and put in a Smartgauge because the former was impossible for me to understand.

  3. #13
    Join Date
    Nov 2009
    Location
    Home UK Midlands / Boat Croatia
    Posts
    20,983

    Default Re: Solar panel replacement - does voltage matter?

    Quote Originally Posted by Baggywrinkle View Post
    20180811_160055.jpg 20180819_142629.jpg

    Victron Smartsolar MPPT 100/30 with BT gives you detailed visual output for the last 30 days. I also have the Victron battery monitor (BMV 712) which also has BT output.

    If you download the android/iphone app "Victron Connect" you can fire it up and explore all the user interfaces and settings for their devices as it has dummy profiles for each device programmed into the app. Try before you buy.

    I installed mine in 2018 and it has been excellent.

    Most I've got out of my 300W panels in one day was 1,5kWh

    Solar300W.jpg
    I also have a Victron MPPT and am very pleased with it. It does benefit from a high voltage, and high voltage also means less cable loss, so my recommendation would also be to maximise voltage up to that which can be handled by the controller by wiring panels in series, if one has multiple panels. The only reason not to wire in series would be if any of the panels are in shadow at a time when none of the other panels are. The problem then is that the panel in shadow will reduce the total output more than would otherwise be the case.

    I have this problem in that two of my four 100W panels are virtually always in shadow and two are in sun, so I have two in series and two in parallel. This means that my 400W maximum 24 hour output is only 1.3 kWh. It's not great for 400W but it's acceptable.

    Richard

  4. #14
    Join Date
    Jan 2011
    Posts
    5,793

    Default Re: Solar panel replacement - does voltage matter?

    You're better off putting a pair of 120w panels in series than putting a single 250w panel on.

  5. #15
    Join Date
    Oct 2010
    Posts
    1,503

    Default Re: Solar panel replacement - does voltage matter?

    Quote Originally Posted by Bobc View Post
    You're better off putting a pair of 120w panels in series than putting a single 250w panel on.
    Why?

  6. #16
    Join Date
    Nov 2009
    Location
    Home UK Midlands / Boat Croatia
    Posts
    20,983

    Default Re: Solar panel replacement - does voltage matter?

    Quote Originally Posted by dgadee View Post
    Why?
    Presumably voltage as in #13?

    Richard

  7. #17
    Join Date
    Oct 2010
    Posts
    1,503

    Default Re: Solar panel replacement - does voltage matter?

    Quote Originally Posted by RichardS View Post
    Presumably voltage as in #13?

    Richard
    I took the advice to go for high voltage and went for one with these specs:

    Peak power Wp 245W
    Module Efficiency: 19.4%
    Voltage at peak power Vmp: 44.3V
    Max open circuit voltage Voc: 53.0V
    Current at peak power Imp: 5.54A
    Max short circuit current Isc: 5.86A
    Weight: 15kg

    And, as I said, width is about 800mm so easier to fit, though two smaller panels would certainly have worked too.

  8. #18
    Join Date
    Nov 2009
    Location
    Home UK Midlands / Boat Croatia
    Posts
    20,983

    Default Re: Solar panel replacement - does voltage matter?

    Quote Originally Posted by dgadee View Post
    I took the advice to go for high voltage and went for one with these specs:

    Peak power Wp 245W
    Module Efficiency: 19.4%
    Voltage at peak power Vmp: 44.3V
    Max open circuit voltage Voc: 53.0V
    Current at peak power Imp: 5.54A
    Max short circuit current Isc: 5.86A
    Weight: 15kg

    And, as I said, width is about 800mm so easier to fit, though two smaller panels would certainly have worked too.
    That all makes good sense to me.

    Richard

  9. #19
    Join Date
    May 2016
    Location
    Suffolk
    Posts
    8,131

    Default Re: Solar panel replacement - does voltage matter?

    Quote Originally Posted by dgadee View Post
    I took the advice to go for high voltage and went for one with these specs:

    Peak power Wp 245W
    Module Efficiency: 19.4%
    Voltage at peak power Vmp: 44.3V
    Max open circuit voltage Voc: 53.0V
    Current at peak power Imp: 5.54A
    Max short circuit current Isc: 5.86A
    Weight: 15kg

    And, as I said, width is about 800mm so easier to fit, though two smaller panels would certainly have worked too.
    "12v" Panels are commonly about 20v and the advice is often to connect them in series to a MPPT controller. The panel above is already 44v, so no need for series connection
    Rainbow Marine.
    www.rainbowmarine.co.uk

  10. #20
    Join Date
    Jan 2011
    Posts
    5,793

    Default Re: Solar panel replacement - does voltage matter?

    Quote Originally Posted by dgadee View Post
    Why?
    Higher voltage means less amps, less resistance down the wires so better efficiency, and longer charging hours.

    However as you have a 44v panel, then this is not relevant.

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