Voltage limit on MPPT

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matt1309 asked Apr 17, '23

Voltage limit on MPPT

Hi Folks,

I'm looking to understand the MPPT max voltage limit a bit more, for example the 250/100 MPPT.

Max voltage being 250v. Say I have panels with VoC of 49.5, and put 5 in series. (Awfully close to 250v)

VoC is technically under 250v however in practice, in the scenario cloud -> sun with battery disconnected for whatever reason I suspect 250v would be breached even if for a short period of time.

Is the 250v limit on MPPT based on VoC (ie likely has a buffer for the niche scenario described above), or is 250v a hard limit and installers/system designer should add a buffer themselves to ensure the 250v is never breached or is VoC * number in string sufficient.

Thanks,
Matt.

MPPT Controllers voltage overvoltage

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Answer 1 · 2023-04-17T11:08:26Z

Michelle Konzack answered · Apr 17, 2023 at 11:08 AM

It is a hard limit.

Please use the Victron MPPT Calculator because with your 5 Solarpanels you can reach easyly 275V if the temperature drop to -20°C and 290V at -40° if you live in Estonia or similar

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matt1309 commented · Apr 17, 2023 at 05:06 PM

Thank you. Was more looking for understanding that needing a calculator but thank you you've answered it.

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