Electric shunt size

[BOWHOUSE52]

Hi you tech bods again
I have a 300amp shunt I would like to fit into my Rapido 786f van Electrics Is this going to be big enough We have got the usual basic electrics in the van and I have fitted 380watts of solar through a charge controller 1000w/2000 max inverter & 30amp b2b charger look forward to some constructive Idea's

 

[Lenny HB]

Yep, 300 amp shunt is more than enough.

 

[Kannon Fodda]

If you take your worst power draw, the inverter, 2000W at 230/240V, apply that wattage to a 12V system the amperage is about 167. Put a bit of overhead into the inverter's inefficiency, and you still have a lot of overhead for other stuff going on.

300A shunt should be adequate.

 

[BOWHOUSE52]

Christ lenny HB that was quick the you very much

 

[pappajohn]

I assume you are fitting the shunt to fit some kind of energy monitor?
You won't get anywhere near the shunts limit unless you drive into an electric pylon and get hit by a falling cable.
Even the inverter, at its temporary max of 2000w will only draw 166amps.
Go for it.

^{_{Subscribers  do not see these advertisements}}

 

[BOWHOUSE52]

Thanks everyone Motorhome fun have come up trumps again And thanks to Jim for running it

 

[RandallC]

I assume you are fitting the shunt to fit some kind of energy monitor?
You won't get anywhere near the shunts limit unless you drive into an electric pylon and get hit by a falling cable.
Even the inverter, at its temporary max of 2000w will only draw 166amps.
Go for it.

What is the reason for fitting a shunt?

As PJ says the only reason is to monitor current flow OR to use as control PV in a control loop

 

[Two on Tour]

What is the reason for fitting a shunt?

As PJ says the only reason is to monitor current flow OR to use as control PV in a control loop

Not only to monitor, but also to record.

 

[RandallC]

Not only to monitor, but also to record.

View attachment 496672

True,
But,
For what reason would you record said data other than say you would for MPG. Which is perhaps interesting to monitor for sudden variants or Long term trends but is otherwise IMHO largely less than useful on a daily basis.

 

[Two on Tour]

True,
But,
For what reason would you record said data other than say you would for MPG. Which is perhaps interesting to monotor ofr sudden variants but is otherwise IMHO largely less than of any use.

Really depends on whether or not you are interested on what your system is doing and performing to get the optimum out of it.

^{_{Subscribers  do not see these advertisements}}

 

[Kannon Fodda]

What is the reason for fitting a shunt?

As PJ says the only reason is to monitor current flow OR to use as control PV in a control loop

With a lithium battery, as I understand it, the voltage is likely not to drop much during discharge, at least until the battery charge is close to depletion. A lead-acid would gradually and consistently show loss of voltage, so you can watch a needle on a voltage gauge and have an idea what is left. Lithium you use a shunt to calculate the current that has passed through the battery on charge / discharge as the means of telling you when the lights will go out.

 

[RandallC]

With a lithium battery, as I understand it, the voltage is likely not to drop much during discharge, at least until the battery charge is close to depletion. A lead-acid would gradually and consistently show loss of voltage, so you can watch a needle on a voltage gauge and have an idea what is left. Lithium you use a shunt to calculate the current that has passed through the battery on charge / discharge as the means of telling you when the lights will go out.

Ahh, Thanks,

Perhaps tis me, a bit out of date as tech has moved on since my days in the cash strapped power industry.

 

[BOWHOUSE52]

This is exactly why I started thread and glad it as raised some interesting comments been very interesting