Will MPPT 75/15 draw down battery in winter with no panels attached

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nyodyssey410 asked Sep 16, '20

Will MPPT 75/15 draw down battery in winter with no panels attached?

Getting ready to store the boat for the winter and I am taking the panels down. Do i need to disconnect the MPPT's from the house bank?

Thanks

MPPT Controllers

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spirou commented · Sep 17, 2020 at 03:36 AM

There is a minimal self consumption. Manual states 25mA however not sure if that is in operation or standby.

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Trevin Corkery spirou commented · Sep 17, 2020 at 06:14 AM

I just wanted to add that its 25mA@12V and 15mA@24V

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Alexandra ♦ Trevin Corkery commented · Sep 17, 2020 at 08:25 AM

@nyodyssey410

Battery self discharge is also a factor to consider.

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Answer 1 · 2020-09-17T08:59:15Z

Vance Mitchell answered · Sep 17, 2020 at 08:59 AM

If you are disconnecting the panels, you might as well disconnect the battery as well. If left connected it will draw approximately 4 Ah per week.

On a 100Ah battery that is a considerable amount, on a 1000Ah not so much.

By the time you add all the parasite loads together, you are best to either leave your battery on a charger or disconnect the battery completely.

Even disconnected completely a lead acid battery will benefit from being changed at least once every month or two whilst in storage.

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