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Post by bodger on Oct 1, 2020 9:03:14 GMT
I think you will find that most everything come out of China. corrected that for you
or as a St Louis immigration officer said to me: "we stamp everthang".
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Post by Telemachus on Oct 1, 2020 9:14:21 GMT
Interesting, however it seems to me to be more aimed at lead acid. You can configure the under voltage cut off value but as far as I can tell you can’t configure the over voltage, it is fixed at 16v which is no good for Li. You can of course use the BMV relay to operate the remote control connection. But without the ability to monitor and control on individual cell voltages you will have to leave a fair bit of margin to cater for cell imbalance. This is one reason why I didn’t go for Valences, you can’t easily access the individual cells to connect eg a BG8S. Yes I know the valence has inbuilt monitoring accessible by PC, but as far as I know it isn’t trivial to use that to operate a high or low cut-off. Peter will know better than me about that.
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Post by kris on Oct 1, 2020 13:36:37 GMT
Interesting, however it seems to me to be more aimed at lead acid. You can configure the under voltage cut off value but as far as I can tell you can’t configure the over voltage, it is fixed at 16v which is no good for Li. You can of course use the BMV relay to operate the remote control connection. But without the ability to monitor and control on individual cell voltages you will have to leave a fair bit of margin to cater for cell imbalance. This is one reason why I didn’t go for Valences, you can’t easily access the individual cells to connect eg a BG8S. Yes I know the valence has inbuilt monitoring accessible by PC, but as far as I know it isn’t trivial to use that to operate a high or low cut-off. Peter will know better than me about that. That’s not what James said and from what I read briefly you can control the over voltage but I’ll check.
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Post by kris on Oct 1, 2020 13:53:32 GMT
You might be right nick it looks like you can set the under voltage but not the overvoltage.
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Post by kris on Oct 1, 2020 14:24:33 GMT
Doh your right nick, thanks for that. It must be hard to be so clever? I’ve let James know as well, as he was going to bye one after frying one of the victron ones because they are not bi directional. Typical just when you think youve found a solution.
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Post by Deleted on Oct 1, 2020 14:32:22 GMT
Which charging source is raising the voltage too high for the lithiums?
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Post by kris on Oct 1, 2020 14:40:33 GMT
Which charging source is raising the voltage too high for the lithiums? It’s a matter of having extra protection for the batteries. The solar will be regulated by the mppt and battery chargers are regulated and have lifepo4 settings. Eventually I’ll sort the alternators out. But it would be good to have an extra cutout.
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Post by Deleted on Oct 1, 2020 14:47:57 GMT
I suppose another approach would be some sort of audible alarm system which reminds you to disconnect whatever source is causing the problem..
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Post by kris on Oct 1, 2020 14:51:09 GMT
I suppose another approach would be some sort of audible alarm system which reminds you to disconnect whatever source is causing the problem.. yes maybe, it would be good if it broke the contact as well. John might even have been interested in one if it had done the job. I think your mastervolts have low voltage cutouts so it doesn’t really matter to you.
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Post by Deleted on Oct 1, 2020 14:56:25 GMT
Yes they have high and low cutouts in the BMS.
However I am seriously considering putting in an electric pod drive on Dulcinea for "stealth mode" which would require a 48v lithium battery bank.
So I am still interested in the subject as that bank would be made up of individual cells like the Calb cells that nick has bought.
Not ready to do away with the diesel engines but an electric drive for slow speed operations is very appealing.
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Post by bodger on Oct 1, 2020 15:33:34 GMT
Yes they have high and low cutouts in the BMS. However I am seriously considering putting in an electric pod drive on Dulcinea for "stealth mode" which would require a 48v lithium battery bank. So I am still interested in the subject as that bank would be made up of individual cells like the Calb cells that nick has bought. Not ready to do away with the diesel engines but an electric drive for slow speed operations is very appealing. I passed that shapely mini-trawler near Hambleden a couple of weeks ago. She would need some serious watts to drive her at more than a snail's pace.
What wattage was ( ) you considering?
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Post by Deleted on Oct 1, 2020 15:35:31 GMT
4.3kw Aquamot pod is what I am looking at.
It's remarkably easy to propel actually.
And the electric stealth mode would be precisely for that. A snails pace.
I have a pair of nice diesel units for anything faster..
Even one of my approx 1kw 36v 101lb thrust minn Kota units will move it. Ok not at all fast but that's not the aim.
Twin rudders on that boat which means it will have steerage even when gliding along at about 1mph. So the pod motor would be fixed centrally rather than being steerable .
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Post by Telemachus on Oct 1, 2020 15:52:37 GMT
Doh your right nick, thanks for that. It must be hard to be so clever? I’ve let James know as well, as he was going to bye one after frying one of the victron ones because they are not bi directional. Typical just when you think youve found a solution. I think you could still use it though, by operating it from the BMV relay. You can set the BMV relay to operate both on under voltage and over voltage. Just connect the NO terminal of the BMV relay to the “Remote” connection, and the COM relay terminal to 0v.
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Post by kris on Oct 1, 2020 16:46:13 GMT
Doh your right nick, thanks for that. It must be hard to be so clever? I’ve let James know as well, as he was going to bye one after frying one of the victron ones because they are not bi directional. Typical just when you think youve found a solution. I think you could still use it though, by operating it from the BMV relay. You can set the BMV relay to operate both on under voltage and over voltage. Just connect the NO terminal of the BMV relay to the “Remote” connection, and the COM relay terminal to 0v. um that’s worth thinking about. So set the undervoltage on the intelitec and then use the bmv 712 to send it the signal to cutout at over voltage? I might speak with the guy from intelitec again and see what he says, he was very friendly.
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Post by kris on Oct 1, 2020 17:00:04 GMT
Yes they have high and low cutouts in the BMS. However I am seriously considering putting in an electric pod drive on Dulcinea for "stealth mode" which would require a 48v lithium battery bank. So I am still interested in the subject as that bank would be made up of individual cells like the Calb cells that nick has bought. Not ready to do away with the diesel engines but an electric drive for slow speed operations is very appealing. you’ve got the lithium bug now then?
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