question

nyodyssey410 avatar image
nyodyssey410 asked

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

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



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3 comments
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spirou avatar image spirou commented ·

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 avatar image Trevin Corkery spirou commented ·

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

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Alexandra avatar image Alexandra ♦ Trevin Corkery commented ·

@nyodyssey410

Battery self discharge is also a factor to consider.

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1 Answer
Vance Mitchell avatar image
Vance Mitchell answered ·

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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