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Post by JohnV on Feb 25, 2021 9:11:32 GMT
Questions alas, and not answers . I still can't decide whether to replace my 3 smaller ones with 2 bigger ones... if I do, I'm tempted away from the mppt controller (mine is 50a) cause by the time you get into bigger territory, they are over 200 quid. Don't know what make of MPPT you have but some (Tracer for example) have a current limiting system. This means you can connect up to twice their rated power of panels.
Obviously you don't get any more charge in bright sunlight but you improve greatly your solar collection in poorer conditions
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Post by Deleted on Feb 25, 2021 9:49:11 GMT
Victron. For example you can set up two 325w panels and run them through a 30a Victron MPPT. The reason for doing this is as JohnV says is because it gives better out of season power availability and there will be no need for any more than 30a charge rate in summer anyway. I'm not quite sure how much of the excess is dissipated via the heatsink and whether that would need fan assistance. I suspect because it is solar it is chopped rather than disposed of as heat somehow but I don't know. Certainly interested if anyone does know because that's how my setup is arranged.
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Post by Deleted on Feb 25, 2021 9:52:41 GMT
Victron. For example you can set up two 325w panels and run them through a 30a Victron MPPT. The reason for doing this is as JohnV says is because it gives better out of season power availability and there will be no need for any more than 30a charge rate in summer anyway. Thatβs a good idea, remove almost 30% of the efficiency π
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Post by Deleted on Feb 25, 2021 9:53:33 GMT
@bedruthan
Why does it do that?
Do you mean by losing the higher power available in summer?
If so then my argument is that this power is simply not required in summer anyway.
If you mean losing 30% in winter then I'm intrigued.
Are larger MPPT units inherently more efficient than smaller ones and is it really that much of a difference?
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Post by Deleted on Feb 25, 2021 10:04:42 GMT
Why does it do that? Do you mean by losing the higher power available in summer? If so then my argument is that this power is simply not required in summer anyway. The power is only wasted when you oversize the system to your needs. I can see that you buy stuff from bimble, (nothing wrong with that) because the panels are cheap, but very efficient. Why screw that up by then putting an underpowered mppt onto the system. Just build your system to your needs.
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Post by Deleted on Feb 25, 2021 10:05:50 GMT
I have never bought anything from Bimble.
I bought the panels from a local supplier in Berkshire and the victrons it makes no difference who you buy from.
Please stop making assumptions all the time it is not very helpful.
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Post by Deleted on Feb 25, 2021 10:10:26 GMT
I have never bought anything from Bimble. I bought the panels from a local supplier in Berkshire and the victrons it makes no difference who you buy from. Fair enough, but I still suspect the panels are of bimble origin. I didnβt mention the victron supply route by the way, please read my posts before making assumptions.
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Post by Deleted on Feb 25, 2021 10:21:06 GMT
Well they actually are nothing to do with Bimble as the supplier is someone who imports his own equipment and does domestic installations.
Why are you so fixated about Bimble anyway?
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Post by Deleted on Feb 25, 2021 10:30:15 GMT
Get someone round the boat who knows what they are doing Rog, I would like to understand how the two banks operate before suggesting...
Its all guess work till then.
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Post by Deleted on Feb 25, 2021 10:30:29 GMT
Well they actually are nothing to do with Bimble as the supplier is someone who imports his own equipment and does domestic installations. Why are you so fixated about Bimble anyway? Whatever..... Perhaps you should remember some of the posts you have previously made..... (I obviously canβt quote the posts because you regularly delete).
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Post by Deleted on Feb 25, 2021 10:39:37 GMT
This is all getting slightly surreal.
I've never mentioned Bimble in any comment existing or deleted.
Bizarre.
ETA obviously in the last few posts but other than that I haven't.
Never bought anything from them and I know nobody who has.
I think you are confusing me with someone else again. This is not the first time this has happened.
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Post by Deleted on Feb 25, 2021 10:40:16 GMT
This is all getting slightly surreal. I've never mentioned Bimble in any comment existing or deleted. Bizarre. Ok.......
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Post by Deleted on Feb 25, 2021 10:45:52 GMT
I have purchased from Bimble, panel and controller, great service and price and all working ok.
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Post by Deleted on Feb 25, 2021 10:59:08 GMT
I have purchased from Bimble, panel and controller, great service and price and all working ok. Me too (for panels), I get controllers from elsewhere, as bimble are quite expensive on that front. Delivery is expensive, but even with that added, there panels are much cheaper than elsewhere.
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Post by Deleted on Feb 25, 2021 13:15:09 GMT
Questions alas, and not answers . I still can't decide whether to replace my 3 smaller ones with 2 bigger ones... if I do, I'm tempted away from the mppt controller (mine is 50a) cause by the time you get into bigger territory, they are over 200 quid. Don't know what make of MPPT you have but some (Tracer for example) have a current limiting system. This means you can connect up to twice their rated power of panels.
Obviously you don't get any more charge in bright sunlight but you improve greatly your solar collection in poorer conditions Hopefully a simple question for anyone in the know.
If I did decide to upgrade my solar panals (one damaged and all about 6 years old), could I go up to a total of 780w for solar panals without needing to change the 40A MPPT controller? Page 9 on the manual seems to indicate I can, but I'm a bit of a numpty at times...
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