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Post by Zed on Mar 25, 2017 15:11:09 GMT
My panel says it provides 22v open circuit and 17v at peak power.
So I size the cables for 150w at 17v yes?
This comes out at 2.4mm dia with 3% losses.
If I do same calc for 12v I find I need 4mm dia.
Which is right?
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Post by Tuesday Wildchild on Mar 26, 2017 6:28:33 GMT
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Post by pkrboo on Mar 26, 2017 6:58:17 GMT
I've got 4 mm on mine, go with 4 mm.
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Post by rickyrooo1 on Mar 26, 2017 7:11:51 GMT
I got 2.5mm which said it was capable of 150w in the advert, I only run 100w and unless we change the way we camp is plenty for us.
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Post by Tuesday Wildchild on Mar 26, 2017 8:52:18 GMT
I've got what ever I had in my stores, it works.  |
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Post by Zed on Mar 26, 2017 8:59:58 GMT
Read the question again. Doh! |
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Post by Zed on Mar 26, 2017 9:04:01 GMT
There are plenty of 10a controllers being sold as part of 150w kits but if you do the valve on 12v, that's too small, or marginal.
Therefore I conclude we're being told half the story when advised to use 12v in calculations rather than 17-18v.
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Post by Tuesday Wildchild on Mar 26, 2017 9:04:19 GMT
Read the question again. Doh! I don't read what I write so why would you think I'd read others writings?  |
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Post by Tuesday Wildchild on Mar 26, 2017 9:05:57 GMT
There are plenty of 10a controllers being sold as part of 150w kits but if you do the valve on 12v, that's too small, or marginal. Therefore I conclude we're being told half the story when advised to use 12v in calculations rather than 17-18v. Id say they feel as it's uk it's a rare day you get enough sun for long enough to warrant higher amp controller. |
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Post by Tuesday Wildchild on Mar 26, 2017 9:07:04 GMT
Read the question again. Doh! Read it and the answer is YES. |
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Post by Zed on Mar 26, 2017 9:18:35 GMT
Read the question again. Doh! Read it and the answer is YES. That's better. |
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Post by Zed on Apr 5, 2017 13:13:50 GMT
I got myself an mppt charge controller identical to the one on the bus, some cable, connectors, fuses, some mini trunking and a double cable gland, bolted the panel to the roof, installed the rest and it's up and running. It's the same bits as I had on the early but that was never really tested.
I've switched off the mains charger to see if a 150w panel can keep up with the fridge.
I need about 24ah per day.
Say that's over 6 hours that's 4ah per hour.
12x4=48w average. Hmm, well, you never know but I won't hold my breath. I think I can add another 100w panel in series and keep within the cable and controller limits.
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Post by pkrboo on Apr 5, 2017 20:33:46 GMT
Ahhhh, have you put it on your boat?
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Post by Zed on Apr 5, 2017 21:32:07 GMT
Ahhhh, have you put it on your boat? Yes though the van needs another panel too. 1 thing at a time. I had to replace the shite washer pump today after the previous one seized and burnt out after just a year. I mounted this one the other way up - you never know... |
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Post by Woody on Apr 5, 2017 21:36:14 GMT
Ahhhh, have you put it on your boat? Yes though the van needs another panel too. 1 thing at a time. I had to replace the shite washer pump today after the previous one seized and burnt out after just a year. I mounted this one the other way up - you never know... When are you gonna set sail and move somewhere nearer so we can come see you. I know a great mooring in Yorkshire with a campsite along side. |
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