Phoenix Inverters 12/375 and Security Cut-off

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khaem asked Apr 24, '19

Phoenix Inverters 12/375 and Security Cut-off

Hello, for a mobile application i use a Phoenix inverter 12/375.

It's connected to a VENUS GX which is connected to a Multiplus 48/3000 (the new one).

In this new car/van, the alternator always change the battery charging voltage. 80% of time it's more than 14v, but sometimes and it never last too longs (few second) the voltage go down near 12v.

Problem : i have configured the battery low cut-off to 12V, because it's the vehicule main battery and i don't want to discharge it. So Phoenix each time voltage goes down to 12v cut the inverter.

My question : Can i configure a timer in the phoenix to say it : if and only if the entry voltage goes down more than 30/60s than you cut the inverter. (you don't cut it if you have 11,8v for 1second for example)

I hope i was clear.

Thanks ;)

Best regards,

Emmanuel

Phoenix Inverter Battery Protect voltage alternator

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Answer 1 · 2019-04-24T12:41:05Z

JohnC answered · Apr 24, 2019 at 12:41 PM

Hi Emmanuel. Take a look at the Dynamic Cut-off feature of your Phoenix. https://www.victronenergy.com/live/ve.direct:phoenix-inverters-dynamic-cutoff

It doesn't work exactly like you envisage, but was probably put in place to help deal with just such issues..

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Answer 2 · 2019-04-24T13:42:49Z

khaem answered · Apr 24, 2019 at 01:42 PM

Hello JohnC, i have seen the Dynamic Cuf-off, but it doesn't work when you have another load connected to the same battery.

Thanks anyway ;)

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JohnC ♦ commented · Apr 24, 2019 at 02:26 PM

Ok, understood. But it might get you part-way there. With a separate 48V system you could also look at an Orion 48/12 or an ac 12V charger to boost your 12V 'starter' batt. Or even a separate 12V batt to run the 12/ inverter. You've likely a few options to consider.

With the 48/3000, do you really need it anyway?

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khaem JohnC ♦ commented · Apr 25, 2019 at 11:41 AM

I unfortunately no longer have the space to put an intermediate battery.

I don't know why the voltage of the alternator fluctuates so much ...

My 48V system behind with the Multiplus is adjusted to the best, I can not put less.

If I understand the different possibilities available to me:

- set this Phoenix tempo to more than 30s to not shut down the inverter
- add "more" compatible protection with my install and disable the protection of the Phoenix
- take energy after the 48/12v converter, that I already have, to reinject it into the main battery when the engine runs (and so always stay above 12.00v) ...

other ideas?

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Answer 3 · 2019-04-25T19:41:43Z

ripper answered · Apr 25, 2019 at 07:41 PM

I have essentially the same problem, but I can live with it since it tries to restart after 30 seconds and if the voltage is good it does. Charging of appliances i then intermittent but it doesnt matter. Does it need to be on continously for you? A different approach would be using a relay with ignition on to switch the remote. Then it switches on and shuts off when you turn the key in the ignition which is kinda whats happening if you dont want to drain the vehicle battery.

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khaem commented · Apr 26, 2019 at 06:07 AM

Hello @ripper, thank you for your idea.

You're right : it's possible to take the signal of ignition to switch a relay to power or not the Phoenix inverter.

The problem of shut-off and restart occurs when it does so several times in succession that it puts the Multiplus in a "Fault" State...

The "Multiplus" doesn't support too much start/stop.

In my mind, the simplest way would be to be able to program the phoenix, so no need for other equipment ...

Thanks,

best regards,

Emmanuel

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Answer 4 · 2019-05-08T14:05:01Z

khaem answered · May 08, 2019 at 02:05 PM

Hello guys,

I think i have solved my problem with the Smart Battery Protect :

- it is fully programmable

- it "wait" 90 seconds before cut off the output.

now, it runs normaly...

thanks for your help !

Regards,

Emmanue

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