question

dag avatar image
dag asked

MTTP 75/15 not charignig

My MTTP has stopped chargin

Solal terminal shows same voltage as battery. When I dissconnect the panel, the panel has an output og 19 V. When connected the voltage is the same as the battery.

All connections and cables seems ok.

Dag at Sailboat Ruske 2


MPPT Controllers
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4 Answers
netrange avatar image
netrange answered ·

Maybe the batteries Are full ... At about 14.4 volts ... + 5 Volt mppt higher starting Voltage ...the mppt won't start any charging ...

How many Panels are connected ?


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dag answered ·

Hi, the battery was at. 12,5 V

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sacjec99 answered ·

I have exactly the same problem, installed it a week ago and so far it’s never worked

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netrange avatar image netrange commented ·

Sounds like a Problem for some of the 75/15 chargers ...

The mppt should start working if there is a load connected to the Batterie ... When enough Solar Voltage is connected to the system ...

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dag avatar image
dag answered ·

I have 1 panel connected.To «netrange»: AGM batteries have a Max voltage of approx.. 12.85 volts

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