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Post by kris on Mar 15, 2024 12:58:28 GMT
Anyway I’m very happy at getting through winter without running a generator.
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Post by on Mar 15, 2024 13:24:13 GMT
Its great isn't it.
Some amazing deals at City plumbing for example £70 including delivery for a 405w panel.
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Post by kris on Mar 15, 2024 13:26:20 GMT
Its great isn't it. Some amazing deals at City plumbing for example £70 including delivery for a 405w panel. I’ve got enough panels. I wouldn’t mind upgrading my inverter so I can weld from solar.
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Post by on Mar 15, 2024 13:27:23 GMT
Yes welding from batteries is an interesting one. I was pondering this just yesterday.
James the welder had achieved it I believe.
You would need a high C rating.
Not sure what the kw use of a welder is working on 6mm plate. 3kw?
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Post by kris on Mar 15, 2024 13:31:22 GMT
Yes welding from batteries is an interesting one. I was pondering this just yesterday. James the welder had achieved it I believe. You would need a high C rating. Not sure what the kw use of a welder is working on 6mm plate. 3kw? I have one Victron 3000w inverter but I think I’d need two of these connected. I presently have to run a 6kw diesel generator if I want to weld. So 6kw should do it.
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Post by on Mar 15, 2024 13:35:04 GMT
Yes. Interesting.
Thats a lot of power coming out of the batteries.
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Post by kris on Mar 15, 2024 13:37:11 GMT
Yes. Interesting. Thats a lot of power coming out of the batteries. It isn’t though if the sun is shining it’s coming from the solar via the batteries. In summer I regularly see 140-150 amps at 12v from my panels.
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Post by on Mar 15, 2024 13:38:45 GMT
6kw from a 12v battery is 6000/12 = 500 amps. Is your 130 amps from the solar going in at 13~14v or do you run at a higher voltage?
It won't be welding direct from solar. The batteries will be supplying the current.
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Post by kris on Mar 15, 2024 13:42:41 GMT
Yes 140-150amps at13-14v yes. But it wouldn’t be a full 6kw. As the generator isn’t flat out when welding. But it’s definately more than 3000kw. Yes it is a large current but it would be handy to be able to do it.
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Post by on Mar 15, 2024 13:51:02 GMT
I think James did it with the Cob20 NMC cells but not sure about the Valences. The C rating might not be high enough.
The COB cells are individual 20a rigidly framed pouch cells easy to build up to any voltage you like.
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Post by on Mar 15, 2024 13:55:34 GMT
These are the COB cells. I think they have a 10C rating so if one were to put 14 of them together it would be 48v nominal and should do 200a @48v which is about 9kw for 6 minutes. I only have 7 of them so could probably get 4.5kw for 6 minutes. I think the C rating of the LFP is lower. The LTO I have has a C rating of 10C but I think they recommend active cooling. Anyway the LTO is my floating electric beer drinking platform battery supply not going to hit them hard as want them to last.
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