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Post by Deleted on Oct 7, 2021 14:28:43 GMT
By not buying Lithium batteries unless you have a brain the size of a planet. ooh! Potential costly mistake then. Potentially (no pun intended) is always costly with these cells as far as I can make out.
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Post by Deleted on Oct 7, 2021 14:29:41 GMT
By not buying Lithium batteries unless you have a brain the size of a planet. Isn't that a 'running joke' of the type we're no longer allowed to use as it provokes, goads and bullies the victims, in this case Telemachus ? Rog I dunno. I haven't been here that long. It was a reference to Marvin the paranoid android from HHGTG
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Post by Deleted on Oct 7, 2021 14:31:43 GMT
My apologies. It was an attempt at humour ... probably the wrong forum these days Rog
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Post by Jim on Oct 7, 2021 14:56:33 GMT
My apologies. It was an attempt at humour ... probably the wrong forum these days Rog Nobody has had the smacked legs PM for that one...yet. for the new boy, rumour has it that Nick's head is ginormous. If he filled it with helium he wouldn't need a glider. Allegedly.
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Post by kris on Oct 7, 2021 16:48:08 GMT
By not buying Lithium batteries unless you have a brain the size of a planet. Isn't that a 'running joke' of the type we're no longer allowed to use as it provokes, goads and bullies the victims, in this case Telemachus ? Rog Yes but nick won’t react because he’s a saint.
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Post by JohnV on Oct 7, 2021 17:13:26 GMT
Use LA batteries Rog I won't say it Rog ....... but I'm sure you know the word I'm thinking
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Post by peterboat on Oct 7, 2021 17:42:52 GMT
Use LA batteries Rog I won't say it Rog ....... but I'm sure you know the word I'm thinking I have to say this John but I use LifePo4s in 3 applications with no issues and Lipos in my little electric car with passive balancing again no issues how is your KISS system working John?
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Post by Deleted on Oct 7, 2021 18:00:17 GMT
I won't say it Rog ....... but I'm sure you know the word I'm thinking I have to say this John but I use LifePo4s in 3 applications with no issues and Lipos in my little electric car with passive balancing again no issues how is your KISS system working John? Actually, I would be interested to learn a bit more about these KISS systems. Are you guys using the inverters low power shut down to protect the cells, or have you got some kind of automatic charging arrangement set up when the voltage falls below a certain level. I don't like the idea of relying on the BEP switch, but I'm not sure the inverter shutdown would cover it either. What about the other DC loads that will still be loading the system when the inverter is off? ETA, Or are you solely relying on the BMS and perhaps an audible alarm? Sorry of you have described your systems before, post a link if it will save you some typing. Thanks
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Post by JohnV on Oct 7, 2021 18:48:58 GMT
the only low voltage loads on my LiFePO4s are the water pump, sink drain pump and toilet macerator so apart from a few milliamp for the voltage/current meter there are no steady loads. If you know the invertor has gone off you don't use them until you sort it (and because everything else including the lights are 240v you know when the inverter is off )
The only way my batteries are charged is by battery chargers or solar where I have the maximum charge voltage set well below the maximum so they only charge 85/90% maximum.
when they have reached the maximum voltage you can watch the current from the MPPT controller drop right off and sit at about 1 Amp (which is more or less the Quiescent current of the Inverter) The batteries themselves are Valence and have excellent BMS systems, there are 6 of them in three banks of 2 seriesed to give me 24V at just under 400Ah
If they get low at anytime then they can charge from a pair of Vetus battery chargers running off either a generator (having a big engine room I have 2 generators each 6Kva) or shore power. my generators being inside and fairly well silent boxed as well can be run virtually any time as 50 foot away you can't hear them.
I am not really set up for continuous cruising and the system is designed for my use which is cruising in the summer, tucked up on a mooring with 240V in the winter.
If I was needing to be totally off grid I would need to increase my solar (at the moment about 1Kw) and possibly investigate alternator charge but for now it is not needed.
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Post by Deleted on Oct 7, 2021 18:56:36 GMT
Thank you JohnV
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Post by Deleted on Oct 7, 2021 19:16:53 GMT
Looks like my cells have a critical voltage of 2.5V, my inverters low voltage protection kicks in at 10V, so pretty close, particularly as I have pumps and lights running of the batteries too.
Out of interest, how reliable is the inverter disconnect? What inverter and battery charger are you using John V and Peterboat?
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Post by Telemachus on Oct 7, 2021 19:27:04 GMT
This is the quandary. One can rely on charging devices working as they are supposed to. Which almost certainly they will. But only almost certainly, not definitely. That’s why I spent some time and a bit of money on a Tyco BDS-A relay and the electronics to drive it. Hopefully it will never need to operate, but if it does I’ve save my £1800 batteries.
Maybe we make too much of this, after all in the past 11 years we’ve not had a regulation failure either from the alternator or from the Combi charger.
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Post by JohnV on Oct 7, 2021 20:05:16 GMT
I have a Sunshine Solar 3000 W 24V inverter the alarm starts sounding at 21.6 Volts and it shuts down at 20.5 Volts
(the spec sheet says 20.4 but I measured mine with a variable voltage to check them before I relied on it and did it a couple of times to make sure)
In actual practice of course it hits it's low voltage when there is a decent chunk of current being drawn so as soon as the load is removed it rebounds somewhat.
As well, it is being measured inside the inverter where the wiring volt drops will be maximum. The actual voltages at the battery terminals will a little bit higher.
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Post by Deleted on Oct 7, 2021 20:15:46 GMT
Also if the batteries are a large investment it would probably be worth running the 12v appliances through one of those fridge battery protection devices.
Someone will have mentioned it already I have not read / forgot all of previous posts.
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Post by brummieboy on Oct 7, 2021 22:09:11 GMT
By not buying Lithium batteries unless you have a brain the size of a planet. Isn't that a 'running joke' of the type we're no longer allowed to use as it provokes, goads and bullies the victims, in this case Telemachus ? Rog On an unmoderated forum, you can choose to do what you like. You've chosen to delete your tags, others have not. I've never called TD a victim, and in the absence of moderation, 'allowed' is not a valid description any way. Telemachus joins in in a jocular way in the same way Stabby, Twerp and Quaysider et al do. It just seems that with TD and Kris, there is a malicious edge to the posts. That is what I and others find, for want of a better word, Sad.
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