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Charles McCane avatar image
Charles McCane asked

Battery Protect will not disconnect power

I have a BP 220 connected exactly as shown in the included schematic. It will not disconnect its poles for any reason under any circumstances ever. I sent the defective unit back and rec’d another one, same exact thing. Is this an exercise in complicating what should be simple?

Battery Protect
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klim8skeptic avatar image klim8skeptic ♦ commented ·
Take a photo of the document and your installation, and post them here.
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Charles McCane avatar image Charles McCane klim8skeptic ♦ commented ·

See SBP product pdf https://www.victronenergy.com/upload/documents/Datasheet-Smart-Battery-Protect-65-A--100-A--220-A-EN-.pdf

My built-as is identical to the diagram at the bottom. The load is a Renogy 3000W PSW inverter. It stays on, always, regardless of the load switch position in VictronConnect. At this point I don‘t believe SBP is capable of interrupting the load. Even with the manual switch block removed, the load is uninterrupted. I waited over 2 mins but no disconnect. The failure mode is particularly bad as VictronConnect shows the load as disconnected and reports no error.

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Brad Carpenter avatar image
Brad Carpenter answered ·

I unfortunately see the same problem where the Battery Protect 65 when turned "off" by the remote switch does not turn off the Inverter using the Remote line.

I have the inverter powered on as detailed in the BP 65 manual section 3.2 (right picture). I've measured the output Voltage of the Battery Protect at ~2V when the Battery Protect is switched "off" from 24V, but 2V on the remote line is enough to keep the Victron inverter powered on. When I disconnect the Remote line from the Battery Protect, then the Inverter finally shuts off. But when I reconnect the Remote line to the "off" Battery Protect, the Inverter turns back on. This is a MAJOR safety issue.

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Matthias Lange - DE avatar image Matthias Lange - DE ♦ commented ·
Try to add a pull-down resistor from the remote wire to ground to pull the 2V to 0V.
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Brad Carpenter avatar image Brad Carpenter Matthias Lange - DE ♦ commented ·

I was thinking about adding a pull down resistor (I have on laying around somewhere), but haven't tested it yet. Adding a pull down resistor should be detailed in the schematic if it's required, shouldn't it?

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Brad Carpenter avatar image Brad Carpenter Brad Carpenter commented ·
I had a 5kOhm pull down resistor laying around from a power supply, which did pull the voltage down from 2 V to 1.4 V. I connected the resistor from the Vout on the BP to a negative terminal. which turned off the inverter in about 3-5 seconds. Removing the resistor turned the inverter back on in about 3-5 seconds.
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christianf250 avatar image
christianf250 answered ·

Hi / Bonjour

it will possible to add a little schematic (or picture) for really understand how to plug the resistor and how many watt the resistor need to be.

Regards

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