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mpmattman avatar image
mpmattman asked

12V Marine system help

Hi,

I will do my best to keep this short:

I have a 26ft. Sailboat on the Ossiachersee in Austria.

Because of weight, I want to switch from Lead Acid to Lithium. Because Lithium is so expensive, I want to switch from PWM to Victron MPPT for max battery protection (and max batt/solar efficiency.)

Unfortunately, due to different solar panel sizes, I can't have the PVs in series (see diagram).

Is my diagram here correct, or do I need less or more components?

Any info is greatly appreciated!

Cheers,

Matt



ya-sb26-2-deckplan.jpg

MPPT Controllerscerbo gxMPPT SmartSolardc system
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dazey77 answered ·

As your mixing panel sizes, I think you want a MPPT for the 100w panels and one for the 50s.

17v solar is low for the MPPT too. I would work on having everything in series.

You indicate a BMV712 but not its shunt!

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mpmattman avatar image mpmattman commented ·

Thanks for the info dazey77! I am a noob when it comes to MPPT. So if I were to use 2 MPPTs, I would just connect each one directly to the battery via a smart shunt rather than a battery protect?

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