Generator or Inverter for residential use?

[Neuk_]

50A?
Then you have a setup problem if it's pulling from batteries for powerassist.

Sorry 50A I'll chat to Colin then, there has been no additional setup other than plugging everything in and connecting to the DB.

 

[Saba'a]

AFAIK you only get the standard cable pack from Pylontech, but you can perhaps confirm with your supplier if there is a higher rated pack available.

Edit:
This shows that for inverters up to 5kw you will only need one cable pack, but for inverters between 5 and 10kw, you will run double cables from the batteries.

@signates

Did you do double cabling or one cable from batteries to inverter?

 

[TheChamp]

From Sunkyst I see only one thick 50mm cable?

Dont have my batteries yet.

Frustrating as everything paid. Even electrician. He said no more other than combiner box but seems lots of sundries. So will see who pays me or electrician.

Oh, I understand, Pylontech connections are very specific, and I suspect the output, where you connect the cable is also rated for a specific current so you cannot circumvent that by just connecting a thicker cable.

 

[wingnut771]

Oh, I understand, Pylontech connections are very specific, and I suspect the output, where you connect the cable is also rated for a specific current so you cannot circumvent that by just connecting a thicker cable.

yeah, the bms limits to 100A max, so 2 bms's = 200A.

 

[AchmatK]

@signates

Did you do double cabling or one cable from batteries to inverter?

Currently only one cable from battery to inverter.

Will order another pack of pylontech battery connection cables and a busbar to do a double connection to the busbar then a single 50mm cable from the busbar to the inverter.

 

[TheChamp]

to the busbar. 2 banks will give you 200A.

You can do that but you are still going to need the connectors to do that, the ones that connect to the battery, and I have never seen them being sold separately, that means you still need to buy the cable, cut of the heads, connect that to a busbar, connect your thick cable to the inverter, that looks like a chore.

 

[wingnut771]

Currently only one cable from battery to inverter.

Will order another pack of pylontech battery connection cables and a busbar to do a double connection to the busbar then a single 50mm cable from the busbar to the inverter.

don't you need an even number of batteries?

 

[wingnut771]

You can do that but you are still going to need the connectors to do that, the ones that connect to the battery, and I have never seen them being sold separately, that means you still need to buy the cable, cut of the heads, connect that to a busbar, connect your thick cable to the inverter, that looks like a chore.

i guess you can use the supplied lugs on the pylontech to the busbar, just use the correct size screw, that way you don't cut anything. then custom 50mm to inverter.

 

[AchmatK]

don't you need an even number of batteries?

No. You can connect 1 to 7/8(not sure on maximum) pylontech batteries in series.

 

[TheChamp]

i guess you can use the supplied lugs on the pylontech to the busbar, just use the correct size screw, that way you don't cut anything.

It looks like you can buy the battery connectors separately. https://powerforum.co.za/topic/3790-pylontech-cable-lugs/

 

[wingnut771]

No. You can connect 1 to 7/8(not sure on maximum) pylontech batteries in series.

yes, but you need to parallel to get 200A.

 

[wingnut771]

It looks like you can buy the battery connectors separately. https://powerforum.co.za/topic/3790-pylontech-cable-lugs/

nice! now we can have short neat cables.

 

[Sinbad]

No. You can connect 1 to 7/8(not sure on maximum) pylontech batteries in series.

parallel

 

[Saba'a]

My setup seems to be doing fine with the supplied battery cables even though they are under rated.

What I have found in my research is that if your are going to connect more than two batteries then you can use a busbar. So you would connect the cables from the batteries to the busbar and then get bigger cables from the busbar to the inverter.

When I'm ready to increase my battery bank I'll be doing them in 2 stacks of 4 batteries connected to a busbar and from there a fuse to the inverter.

You should be fine using the supplied cable with two batteries. The BMS also manages charge and discharge rates.

So does the issue

Did you do double cabling or one cable from batteries to inverter?

refer to size of inverter or size of batteries?

 

[Saba'a]

It looks like you can buy the battery connectors separately. https://powerforum.co.za/topic/3790-pylontech-cable-lugs/

Seems below wasnt answered?

I ordering two usb3000 with a Victron multiplus II 5000 (aiming to get 4 total). Manual recommends 200a fuses. Means a big jump to larger disconnect from 125a fuse on the multi 3000 model. Cables then seem undersized??
Can one put on thicker cables with existing lugs or get new ones

 

[cfvh600]

Spoke to a guy who has a solark i.e Sunsynk installed. Said I must check the checklist and use an earth bond - cheap 2V 40amp relay as inverter has a software controller for it.

Says that earth bond only at Eskom. So if Eskom off need this and can be inside the inverter. Anybody know anything about this?

From the Sunsynk Technical Support Forums:

https://www.sunsynk.org/forum/techi...8kw-if-not-then-how-is-the-delay-best-handled

See the diagram below where the earth bond relay is shown connected to the inverter, not sure if you need it.

 

[TheChamp]

So does the issue

Did you do double cabling or one cable from batteries to inverter?

refer to size of inverter or size of batteries?

Post #1724, single cable.

 

[Sinbad]

Seems below wasnt answered?

I ordering two usb3000 with a Victron multiplus II 5000 (aiming to get 4 total). Manual recommends 200a fuses. Means a big jump to larger disconnect from 125a fuse on the multi 3000 model. Cables then seem undersized??
Can one put on thicker cables with existing lugs or get new ones

200A seems overkill for a 5kva.
I have a Keto disconnector with 160A fuses. (4 BYD 48V batteries)

 

[wingnut771]

Seems below wasnt answered?

I ordering two usb3000 with a Victron multiplus II 5000 (aiming to get 4 total). Manual recommends 200a fuses. Means a big jump to larger disconnect from 125a fuse on the multi 3000 model. Cables then seem undersized??
Can one put on thicker cables with existing lugs or get new ones

the battery can only supply 100A, so have 2 batteries with normal cable to busbar making them parallel, then thick cable from there with 240A fuse.

 

[TheChamp]

Seems below wasnt answered?

I ordering two usb3000 with a Victron multiplus II 5000 (aiming to get 4 total). Manual recommends 200a fuses. Means a big jump to larger disconnect from 125a fuse on the multi 3000 model. Cables then seem undersized??
Can one put on thicker cables with existing lugs or get new ones

Their assuming that you will at times be drawing the maximum current, no need to worry about that for now due to your smaller inverter, you can either wire it right so that you don't worry about it when you upgrade the inverter or just do it adequately for your current requirements, your choice.