Schuits' Solar Solution

[leon.davibe]

Would two batteries be connected like this from the fuse holder ?


Asking as for my two Hubbles
Positive goes from fuse holder to Hubble 2
Negative goes from fuse holder Hubble 1

And then cables between the two Hubbles

View attachment 1582732

it helps to keep them balanced if you have the negative from inverter on one and the positive on the second parallel

ie lets say you have the wires going to the first battery and then two wires going from the battery connected to the second battery there would be a voltage drop and the second battery would lag the other

so the one would shut down empty before the other and the same on charging
not a big deal as they would balance by the one stopping to charge and the other would take all the charge until full

it is however a problem if your charge/discharge rate exceeds what one battery can handle

would change like this maybe, that way one battery isn't further away from inverter

 

[leon.davibe]

Interesting, thanks.

I'll have to find out how to protect the inverter from exceeding 12kw in that case.

I know some may say, just manage which appliances are used, but I'd rather be safe just in case someone doesn't get the message.

not easy task the 60A is what most homes have as a main breaker
but breakers don't trip on 60A peaks sustained they will , don't know much about tripping curves electricians field of expertise

most will only hit 12kw with seldom momentary spikes if ever

how often has anybody tripped their main breaker
you have to have some mining gear running to do that

why i am on three phase , actually succeeded

 

[schuits]

it helps to keep them balanced if you have the negative from inverter on one and the positive on the second parallel

ie lets say you have the wires going to the first battery and then two wires going from the battery connected to the second battery there would be a voltage drop and the second battery would lag the other

so the one would shut down empty before the other and the same on charging
not a big deal as they would balance by the one stopping to charge and the other would take all the charge until full

it is however a problem if your charge/discharge rate exceeds what one battery can handle

would change like this maybe, that way one battery isn't further away from inverter

Ya I did read something about that and keeping the wire lengths the same.

 

[WELIHF]

All plugs and geysers need to be on E/L, Geyser requirement was a change within the last few years so it could be that your was installed prior to the regulation change
You don't need fuses on the panels if your cable current is 1.5x higher rated than isc and paralleling 3 or more strings
Use 500/600V SPD's for strings instead of 1000V
AC cable should be 10mm2 for 63A breaker
E/N bonding has to be permanent according to AIA - make sure after they install to test E/L trips with grid disconnected
Would recommend adding the Clearline 12-01036 Trip Connect to delay power coming back on, we add these on all installs and they also monitor grid voltages to cut for Over and Under Voltage
Batteries and connections are fine, BSL is very good alternative to Hubble, the 7kWh are very good value

 

[schuits]

Thanks for the input.

The permanent EL bond is a thing I see different people doing differently. Keith from Sunsynk has a video showing the setup I currently have.

The delay is probably a good idea, but won't the sunsynk be able to do this?

-edit- Those BSL batteries are over R1500 cheaper per Kw than say a Sunsynk, so worth a look.

All plugs and geysers need to be on E/L, Geyser requirement was a change within the last few years so it could be that your was installed prior to the regulation change
You don't need fuses on the panels if your cable current is 1.5x higher rated than isc and paralleling 3 or more strings
Use 500/600V SPD's for strings instead of 1000V
AC cable should be 10mm2 for 63A breaker
E/N bonding has to be permanent according to AIA - make sure after they install to test E/L trips with grid disconnected
Would recommend adding the Clearline 12-01036 Trip Connect to delay power coming back on, we add these on all installs and they also monitor grid voltages to cut for Over and Under Voltage
Batteries and connections are fine, BSL is very good alternative to Hubble, the 7kWh are very good value

 

[WELIHF]

Thanks for the input.

The permanent EL bond is a thing I see different people doing differently. Keith from Sunsynk has a video showing the setup I currently have.

The delay is probably a good idea, but won't the sunsynk be able to do this?

-edit- Those BSL batteries are over R1500 cheaper per Kw than say a Sunsynk, so worth a look.

We might have different earthing systems to UK, when we disconnect from grid it is only the live cable that is disconnected, you still have a neutral bond at the municipal box so that's why we need a permanent bond, you also run the risk of a contactor failing and then having a floating neutral if it's not bonded.

The only time the bonding is an issue is if they have stolen your earth cable, which happens but that would be picked up on the COC tests after installation.

There is a 60s grid reconnect delay on the inverters internal contactors that you can adjust the reconnect time.

 

[schuits]

The last design I was busy with. Still waiting on the installer to come look, seems they are busy or just working on SA time.