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Post by vasko on Jan 26, 2020 10:33:38 GMT
looks good ! I'm still waiting for my two batteries to arrive... when(if) I got them will test and report back
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Post by alenka on Jan 26, 2020 17:03:09 GMT
No I don’t just a straight forward swop, Transporter Energy based in the UK came up with exactly what I needed for the installation and my local marine electrics engineer fitted it. No one has ever mentioned anything about heat pads, mind here in Jersey we rarely get below 0 degrees C. Certainly no one has ever flagged it as a problem, I also sail throughout the winter and everything works equally well as when it’s 30 degrees in the summer. Please keep us informed how you get on. Did your retain any lead acid batteries for starting or bow thruster: and did Transporter Energy also include a smart alternator in their re-fit? I am also following a parallel discussion on the CA forum which is throwing more into the mix than I had ever thought about.... Low temperature cut off, hight temperature cut off, voltage spikes and shedding that can affect navigation gear. In Greece -7c was on the cards the other week and +40c is not unusual in summer. I confess I would love to go down this route but hesitate following an incident where engineers went aboard to do maintenance work but left the electric masters on and equipment that ran my batteries to zero and killed them. £350 for lead acid batteries was bad enough I would have been bereft had they killed batteries costing a great deal more.
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Post by vasko on Jan 31, 2020 19:11:57 GMT
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Post by sailbleu on Feb 3, 2020 14:28:15 GMT
No UK customs on this shipment Vasco ?
My order has been postponed for a week due to Chinese Corona virus issue.
Regards
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Post by vasko on Feb 4, 2020 18:20:38 GMT
no customs no charges etc. I tested one of the batteries today - in brief I consider myself have a winning a lottery ticket starting at 13.7v and discharging to 11.4v - I manage to get out about 7h by 15amps load (according to my measuring tool : 86ah and 960wh) which is exactlya s expected from 120ah LiFePo4 with BMS with reverse protection. now why we start from 13.7 - very simple: the BMS has reverse protection diode with about 0.8v drop as any standard diode e.g. from 14.4 to 13.7 why we finished at 11.4 - I've asked the BMS to be configured this way as this will allow my cells to last about 3000-4000 cycles. so far this are the good points - what are the bad point - not really a bad points except the internal cables are one 8awg + one 12 awg both rated to 200 degrees - e.g. in total about 100amps safely contentious - I wanted to be about 150amps... but still good for my usages. Also thr actual usable power is not 120ah because of the BMS configuration and reverse protection - which I'm OK also.
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Post by sailbleu on Feb 5, 2020 14:21:13 GMT
Lucky you . Thanks for the feedback
Regards
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Post by vasko on Mar 4, 2020 17:08:05 GMT
OK - now I can also confirm that the wiring is calculated correctly - and can carry a stable constant 150amps current from the one 120ah battery without overheating... and can also start the engine in emergency without any issues.
I'm defiantly saying by-by to expensive overcharging brands which sell same quality stuff but get a 3x overhead just for being "great" and can confirm that bailing aliexpress for the quality is VERY unfair.
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Post by vasko on Mar 5, 2020 13:02:52 GMT
One more test - can a boat engine be started from the house LiFePo4 battery (not fully charged btw)?
Yes it can !
Video showing starting a 3000cc diesel truck from my Chinese 120ah -120ah LiFePo4 with 150a BMS - as mentioned aliexpress rocks - £300 pet battery
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