Idiot's guide to a self build battery

User avatar
nowty
Posts: 5748
Joined: Mon May 31, 2021 2:36 pm
Location: South Coast

Re: Idiot's guide to a self build battery

#1081

Post by nowty »

That copper bar is 50mm x 6mm so you could say its similar to a 300mm2 cable which would be closer to a 500A rating but the bar will cool better as its got a larger surface area and not covered in plastic.

The table on this website gives 825A in still air for that flat bar.
https://www.australwright.com.au/techni ... ar-rating/

But it all comes down to how hot you like your cables and busbars to run.

I run my 50mm x 3mm flat bar at 200A and its barely warm, that table in the website says 570A in still air.
Image
16.9kW PV > 109MWh generated
Ripple 6.6kW Wind + 4.5kW PV > 25MWh generated
5 Other RE Coop's
105kWh EV storage
60kWh Home battery storage
40kWh Thermal storage
GSHP + A2A HP's
Rain water use > 510 m3
AGT
Posts: 952
Joined: Sat Jan 29, 2022 11:26 am

Re: Idiot's guide to a self build battery

#1082

Post by AGT »

Thanks never thought about cooking due to having no insulation!

Appreciate the link too, will have a read.
User avatar
nowty
Posts: 5748
Joined: Mon May 31, 2021 2:36 pm
Location: South Coast

Re: Idiot's guide to a self build battery

#1083

Post by nowty »

AGT wrote: Mon Jun 17, 2024 12:02 am Thanks never thought about cooking due to having no insulation!

Appreciate the link too, will have a read.
Me-thinks you meant cooling, the k is next to the l on the keyboard. :mrgreen:
16.9kW PV > 109MWh generated
Ripple 6.6kW Wind + 4.5kW PV > 25MWh generated
5 Other RE Coop's
105kWh EV storage
60kWh Home battery storage
40kWh Thermal storage
GSHP + A2A HP's
Rain water use > 510 m3
AGT
Posts: 952
Joined: Sat Jan 29, 2022 11:26 am

Re: Idiot's guide to a self build battery

#1084

Post by AGT »

Yes iPhone typo, only use laptop for work, everything else on the phone until eyesight gets worse of course
AGT
Posts: 952
Joined: Sat Jan 29, 2022 11:26 am

Re: Idiot's guide to a self build battery

#1085

Post by AGT »

Continuing my quest for knowledge, found a good you tube video.

‘ new jk inverter bms review & test with sunsynk inverter.

By grant burton. Can’t post link for some reason
User avatar
nowty
Posts: 5748
Joined: Mon May 31, 2021 2:36 pm
Location: South Coast

Re: Idiot's guide to a self build battery

#1086

Post by nowty »

AGT wrote: Mon Jun 17, 2024 4:13 pm Continuing my quest for knowledge, found a good you tube video.

‘ new jk inverter bms review & test with sunsynk inverter.

By grant burton. Can’t post link for some reason
16.9kW PV > 109MWh generated
Ripple 6.6kW Wind + 4.5kW PV > 25MWh generated
5 Other RE Coop's
105kWh EV storage
60kWh Home battery storage
40kWh Thermal storage
GSHP + A2A HP's
Rain water use > 510 m3
AGT
Posts: 952
Joined: Sat Jan 29, 2022 11:26 am

Re: Idiot's guide to a self build battery

#1087

Post by AGT »

If you put your purchase in the checkout at Fogstar ( no connections with them) and then don’t place order, they email you a few days later offering 5% extra discount.

Too early for me still haven’t finished panels on my garage, but just checking things out as I always under estimate, and it’s all the wee bits that add up with time/money
User avatar
nowty
Posts: 5748
Joined: Mon May 31, 2021 2:36 pm
Location: South Coast

Re: Idiot's guide to a self build battery

#1088

Post by nowty »

AGT wrote: Wed Jun 19, 2024 10:11 am If you put your purchase in the checkout at Fogstar ( no connections with them) and then don’t place order, they email you a few days later offering 5% extra discount.

Too early for me still haven’t finished panels on my garage, but just checking things out as I always under estimate, and it’s all the wee bits that add up with time/money
I've found this happens with Its Technologies too.
16.9kW PV > 109MWh generated
Ripple 6.6kW Wind + 4.5kW PV > 25MWh generated
5 Other RE Coop's
105kWh EV storage
60kWh Home battery storage
40kWh Thermal storage
GSHP + A2A HP's
Rain water use > 510 m3
John_S
Posts: 377
Joined: Wed Jun 02, 2021 10:03 am
Location: West London

Re: Idiot's guide to a self build battery

#1089

Post by John_S »

I note that the cable craft busbar is described as an Earth busbar.

Presumably, earth busbars will generally carry zero or minimal current until something goes belly up. Then it is hopefully a short time before a breaker of fuse trips. Thus an earth busbar could have a higher rating than a busbar carrying currents all the time.

Also, it would depend on which posts are taking the current, 1 and 8 would have a lower rating than adjacent posts.
NoraBatty
Posts: 130
Joined: Sat Mar 23, 2024 10:40 am

Re: Idiot's guide to a self build battery

#1090

Post by NoraBatty »

I have two extra jk bms inverters looking for new homes, that were recently delivered, and charged, despite cancellation issues.

If you are wanting to buy one, or two, PM me, as it will be considerably cheaper than fogstar and faster than china.
£101.32 each, plus postage
2.7kw Canadian solar. roof. 3kw solis G98 mcs
12kw midea ASHP
200l hot water
3152W RE, Whitelaw Brae
Octopus agile/outgoing fixed 15p

Planned;
Hybrid system
43kwh eve batteries, 3x16 280A
6-8+kw solar, DC connected.
Post Reply