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TheChamp
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Oh? Just use the power cable that connects the battery to the amplifier if you like car sound things, it's very irresponsible to tell someone about speaker wires to connect a battery.
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Mecer 2400VA Inverter (Community Support)
- Thread starter RedViking
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So I've seen the posts here about the Mecer overheating when the charger is set to 20A... But is there anyone here who uses the 20A setting without problems? I am tempted to try it out cause 10A just won't be enough when the outages are 4+ hours long.
Lupus
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On Lead acid go for it, on lithium no
RedViking
Nord of the South
I've never had to. Even with 3 loadshedding slots. But my i keep my load below 200W.
Guess I need to upgrade my inverter then because my load and DoD of my LFPs are essentially being dictated by how quick I can charge it at this stage. Or how slow I can charge I should say.
Lupus
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Well lithium should still be ok even with the 4 hours.
Same here so far, but I have added more devices to the inverter after upgrading to LFPs, and now I am noticing that the batteries take forever to charge fully, so I might have a problem at a higher LS stage.
RedViking
Nord of the South
Do you measure the voltage? Mecer likes to make a noise long after, probably trickle charging.
Yeah added my wife's PC now and it is around 300W.
Provided I don't load them too much yes and the LS frequency isn't too hectic, because if I discharge during LS faster than 10 A (about 250W), and then I keep that same load when the power is back on, then I ain't getting much of a charge, if at all... I am probably using around 200W, pity I can't monitor it properly.
Lupus
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Well firstly you'd be using about 1a at 250w not 10a, remember your equipment is not 12/24v but 220v. So 250w AC at 220v is around 1amp
Yeah I do measure it, it takes like 1 to 2 hours to get to the bulk voltage, then stays in the absorption stage for like 8 hours if not more depending on how much I have loaded it. Then once that's done the fan switches off and the voltage drops back to float. So seems to be working as it should, just taking forever at 10A.
It would be 1A on the AC side, but 10A on the DC side, no? Power must stay the same.
Lupus
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Yeah I suppose but it looks like you divide by 10 for 12 and 20 for 24
Calculating Pure Sine Wave Inverter power draw
Looking for an inverter calculator? Learn how to determine the 300, 1200, 1500 & 2000 watt inverter amp draw in our Inverter FAQs section. Read now.
www.redarc.com.au
This guide is only for the USA I'd assume because their AC voltage is 120V, not 230V.Yeah I suppose but it looks like you divide by 10 for 12 and 20 for 24
So you're doing 12.5 which would fall more inline with the inverter inefficiency.Calculating Pure Sine Wave Inverter power draw
Looking for an inverter calculator? Learn how to determine the 300, 1200, 1500 & 2000 watt inverter amp draw in our Inverter FAQs section. Read now.
Lupus
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It's Australia which is the same as us
and the inverter efficiency shouldn't matter, it'll still be about 85% or so.
AlphaJohn
Honorary Master
On LFP's my batteries are normally full ages before the Mercer goes off charge cycle.
Helps to watch incoming feed when charging ie:
The inverter runs as charging for 4-6 hours but my batteries BMS switched to full/float within 2 hours from LS
Ah, I see now... Yeah that makes sense then... At the end of the day it means if you're always using about 250W or more then you're pulling more than the 10A charging limit and you're at risk of destroying your batteries, even if they're LFPs, because you'll never be able to charge them back up. With that logic maybe I am using way less than 250W then, or way less on average. Pity I can't tell. Maybe I should get a device, or just a new inverter that charges faster so it wont matter.It's Australia which is the same as us
TheLuckmeister
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@AlphaJohn - What do you use to monitor it?
Is there a way to shut down the system before it reaches a certain battery voltage?
Right now we just guessing because we dont want to reach the BMS cutoff.
Is there a way to shut down the system before it reaches a certain battery voltage?
Right now we just guessing because we dont want to reach the BMS cutoff.
Lupus
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You can set it to 20a, but just take into account it may make the thing pop. Just look at AlphaJohn his LFPs are charged in 2 to 3 hours and when I had my hubble it would charge in about 2 hours with a 170 to 200w load.
Edit: So is your base load about 400W, and it uses up to 800W when charging at bulk in the first box, and your base load is about 200W, and it uses up to 600W when charging in the second box? That's a 400W difference = 20 A charging? I know you charge at 10A so that wouldn't make sense.
Anyways, you know your system better than I could... But are you sure they're fully charged when the BMS causes the switch? And not just limiting the current draw to avoid overcharging because the target bulk voltage of the Mecer is higher than what your battery likes?
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