question

g450 avatar image
g450 asked

Generator automatic start and stop needs momentary signal

Hello everyone.


Set up is this:

BMV712

Venus GX

Old model of Multiplus

Kohler 5kW marine Generator


I would like to automatically start the generator if the voltage drops bellow 12.00V.

The problem is that the generator requires a momentary short to start and to stop, but BMV712 can only do relay closed to start and open to stop. If i wire it to the generator as is the genset will start and immediately stop.

1. What do I need to translate open/ closed relay of BMV712 to momentary impulse to start and to stop?

2. Can Venus GX send a momentary signal?

3. Is a newer MUltiplus able to do momentary signal to start and stop the genset?


Thanks


BMV Battery MonitorGenerator
2 comments
2 |3000
Toggle Comment visibility. Current Visibility: Viewable by all users

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

cleaver avatar image cleaver commented ·

I just used 2 timed relays. made by DEI and were called 528T relays. Ebay for 15.00 per USD.

Set them both up the same to the generator relay and then cut loop on one 528T.

Then one pulses when relay closes and the other when the gen relay opens.

0 Likes 0 ·
Show more comments
2 Answers
Matthias Lange - DE avatar image
Matthias Lange - DE answered ·

With Victron devices this is not possible.
But you can use multi-functional time relay like an Eltako MFZ12DX-UC with the EAW function.
https://www.eltako.com/fileadmin/downloads/en/_bedienung/MFZ12DX_23001005-1_gb.pdf
(or you find a cheaper relay with only EAW function)
This will give you an impulse if the BMV/GX relay engages and another impulse if the BMV/CCGX relay disengage.
I would recommend you to use the GX relay because you have way more options with this.

1 comment
2 |3000
Toggle Comment visibility. Current Visibility: Viewable by all users

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

g450 avatar image g450 commented ·

Looking for EAW only timer.

0 Likes 0 ·
g450 avatar image
g450 answered ·

Thanks

(or you find a cheaper relay with only EAW function)

Does anyone tried to shop for this on Aliexpress?

1 comment
2 |3000
Toggle Comment visibility. Current Visibility: Viewable by all users

Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

Matthias Lange - DE avatar image Matthias Lange - DE ♦ commented ·

The Eltako EAW12DX-UC has only the EAW feature and is a bit cheaper.
EAW is the german shortcut for "Einschalt- und Ausschaltwischer" I don't know the correct translation to find it in english.

0 Likes 0 ·