BMV-700 Relay Dump Load Control

Hello,

I am using a BMV-700 for my system's battery monitor and i added a dump load into the system to benefit from the excess solar. I used my BMV relay, invetret it, but i can set the SOC values only up to 99%. So when the SOC exceeds the 99% mark, the dump load goes off and the PV throttles down.

Can someone explain to me if i am doing something wrong.

2 |3000

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klim8skeptic ♦ commented · Dec 12, 2023 at 08:55 PM

@Billakis what Soc values do you have for the set and clear %.

If you invert the relay, set the clear value (relay closed) to 99%, and the set value (relay open) to 95%, the relay will only be on once the batt gets to 99%, and go off below 95%.

At 99% Soc most batts will be in absorption and pretty much fully charged.

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billakis klim8skeptic ♦ commented · Dec 12, 2023 at 09:10 PM

The set value is to 90% and the clear value to 99%. But with the battery at 99,5% the dump load is turned off.

The dump load is 600W and the PV system is 3000W.

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klim8skeptic ♦ billakis commented · Dec 12, 2023 at 09:36 PM

Check that the relay mode is set to Default.

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billakis klim8skeptic ♦ commented · Jan 04 at 12:38 PM

Thanks for the response. Apparently the settings was correct, but the dump load (a water heating element) has a self control function that turns off periodically depending on temperature.

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