Me again ... with some battery Comms questions

[AlphaJohn]

I would just put cable from master to inverter as the other battery is part of the 24V pack, so I don't see the point of a cable to the slave.

That way the inverter would only see and control 1 x 12V battery

 

[wingnut771]

That way the inverter would only see and control 1 x 12V battery

How does it do that with the negative connected to the slave seeing 24V?

 

[AlphaJohn]

How does it do that with the negative connected to the slave seeing 24V?

Think we talking past each other.

2 connections:
You have + and - that is the power part
You also have the RS485 ie the coms part

The Inverter can see and use 24V via power connection no problem, but will have no way to see battery actual level and balance state, that's where the RS485 part come to play. Unlike say a dumb Mecer better inverters can intelligently control the balancing and charge part. <-- that is the part we discussing.

 

[wingnut771]

Think we talking past each other.

2 connections:
You have + and - that is the power part
You also have the RS485 ie the coms part

The Inverter can see and use 24V via power connection no problem, but will have no way to see battery actual level and balance state, that's where the RS485 part come to play. Unlike say a dumb Mecer better inverters can intelligently control the balancing and charge part. <-- that is the part we discussing.

If it could control the balancing, why does it stipulate that you fully charge each battery first before connecting in series? How would it take power only from one battery if one battery was higher than the other.

This doesn't make any sense.

How do we get the comms working then?

 

[LandyMan]

If it could control the balancing, why does it stipulate that you fully charge each battery first before connecting in series? How would it take power only from one battery if one battery was higher than the other.

This doesn't make any sense.

How do we get the comms working then?

Funny you should mention that, as my dad and I had the same question last night. Not sure if the balancer between the batteries will take care of this by default, and why I am asking all the smart people here all the difficult questions

 

[AlphaJohn]

If it could control the balancing, why does it stipulate that you fully charge each battery first before connecting in series?

Cause an inrush of current is bad for any battery.

How would it take power only from one battery if one battery was higher than the other.

It doesn't, on load it uses both.
When charging it tell one battery to switch to bypass till the other reach the same charge.

How do we get the comms working then?

You complete the bus into the inverter and get info on the inverter display.

 

[wingnut771]

Funny you should mention that, as my dad and I had the same question last night. Not sure if the balancer between the batteries will take care of this by default, and why I am asking all the smart people here all the difficult questions

I don't think the comms do anything to be frank. Install your own balancer imho.

Have you managed to "talk" to the batteries yet?

 

[wingnut771]

Cause an inrush of current is bad for any battery.



It doesn't, on load it uses both.
When charging it tell one battery to switch to bypass till the other reach the same charge.



You complete the bus into the inverter and get info on the inverter display.

We are not paralleling here.

 

[LandyMan]

I don't think the comms do anything to be frank. Install your own balancer imho.

Have you managed to "talk" to the batteries yet?

Yes, balancer will be in place.
Everything will be connected up tomorrow

 

[LandyMan]

I don't think the comms do anything to be frank. Install your own balancer imho.

Have you managed to "talk" to the batteries yet?

Not sure if comms will do anything, but to make sure warranty stays in tact, we have to connect comms cables