question

botnic avatar image

Multiplus BoostFactor

Hello Victron Team,

Can you explain me what exactly is the "BoostFactor"?
Thank you

Kind regards
Pablo

MultiPlus Quattro Inverter Charger
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3 Answers
mvader (Victron Energy) avatar image
mvader (Victron Energy) answered ·

Hi Botnic, please use the help function in VEConfigure. Its the go to place for all these kind of questions.



boostfactor.png (337.2 KiB)
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Hi, so a quick case study question.

We have a system with Quattro 8k/230V with input current limit set on 60A and Power Assist Boost ratio is set to 2.0.

How let's assume we have an abrupt load request - Quattro assumes 2.0*60A current (according to the manual). And at that moment what does it exactly do?

1. Would it prepare those 120A from the batteries? If such, does it ease the input for a few cycles and inverts power from the battery?

2. Would it keep 60A from the input and add 60A from the batteries?


The below chart shows currents active and reactive and THD (sorry for LQ graph, hope it's readable) on the input of Quattro (actually output from grid inverter). It looks like when power assist kicks in, it eases the input for a "second", adds power from DC and brings input current to a previous state.

It's worth mentioning it's not happening always, but at times, which is strange.

wkirby avatar image
wkirby answered ·

I think this is related to your other question.
However, it is normally recommended to be at 2.0. It is the peak power that the inverter will provide when shore current is no enough.

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So, for normal operation, it is recommended to be set to 2.0. Does this mean that if my AC current limit is set to 9 amps that it would provide up to 18 amps?

Also, What scenarios could arise where this value would be better set to another value either higher or lower?

see below. This has nothing to do with continuous output power. This setting only helps the inverter setting its voltage/power when Power Assist kicks in. It is regulated ms after anyway.

Thanks! I've never quite understood what that setting was there for until now.

welcome :o)

No. Not directly connected to the other question. It is recomended to set the Boostfactor to 1.2 by the FischerPanda manual.

markus avatar image
markus answered ·

Boost Power Ratio to be expected, if the inverter has to assist. WKirby was faster. :o)

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If you set this factor too high, you will have Overvoltage Peaks, when Power Assist kicks in.

If you set this factor too low, Power Assist might not work properly.