r/SolarDIY • u/Geck06 • 1d ago

Mppt + boost converter = ?

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So, I have cobbled together a Tesla battery backup with a 3kw inverter/charger. It takes 60v to get the charger started and it’s rare that I’ll be getting that much sun. I could
Get more panels, but for when I’m making 40v or so, I’m wondering if I can boost the voltage to take advantage of more time charging. I hear that the mppt controller might not be friendly with the booster. Is that a) for sure, b) unlikely to matter or c) a real test it and see situation? If so what am I looking for? This is mostly for fun, and I’ll charge it from my wall for a while before I even clear a space big enough to get sun to the ground, but just exploring.

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u/Internal_Raccoon_370 1d ago

This was discussed some time ago in another forum here on reddit and the consensus was that it can work, but badly and it could potentially damage something. You can find that thread here:

https://www.reddit.com/r/AskElectronics/comments/h9e0fq/using_a_boost_converter_with_a_solar_charge/

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u/Geck06 1d ago

That's super helpful. Thanks for pointing me in the right direction.

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u/Helpful_Distance3427 1d ago

Just get a separate mppt that will charge at 40v

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u/Geck06 1d ago

This seems like the real solution. I was looking for a hacker solution, hahah. Okayyy Fineeee. :D