LIFEPO4 Battery discussion thread

Park@82 said:
Did you also buy some? The name does not inspire confidence...
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I'm holding onto the edge of the rabbit hole with my fingernails at the moment. I need to get a 48V inverter too and then some solar panels if I fall in.
 
wingnut771 said:
I did request the victron smart shunt.
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No need for fancy stuff. I expect more from the ROI King 🤣

Connect a known load, say a 100W load. At the moment of connection, start the timer. It should completely drain in 10 hours or so if the BMS kills the output at 10% or something.

The battery is a 1.25 kWh or so. Just add a 10% buffer for loses.
 
denmendez65 said:
No need for fancy stuff. I expect more from the ROI King 🤣

Connect a known load, say a 100W load. At the moment of connection, start the timer. It should completely drain in 10 hours or so if the BMS kills the output at 10% or something.

The battery is a 1.25 kWh or so. Just add a 10% buffer for loses.
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What load is this? Is this load constructive or just going to waste to testing purposes?
 
wingnut771 said:
What load is this? Is this load constructive or just going to waste to testing purposes?
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A test. You want to know what the real capacity of the battery is. Any load also. Just make sure you know the power draw. A 600W kettle or a 100W lightbulb etc.
 
wingnut771 said:
Try get to upington.
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When last where you in Upington? I heard the same argument from some guys at work. They have never been to the Namibia border in 20 years and were saying they wont buy an EV because "what if I want to go to Namibia border".
 
denmendez65 said:
When last where you in Upington? I heard the same argument from some guys at work. They have never been to the Namibia border in 20 years and were saying they wont buy an EV because "what if I want to go to Namibia border".
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A couple of years ago when I did a road trip around the country.

Yes, it looks like there are a lot when you look at the map, now zoom in and see your options. Take dbn for example.
 
wingnut771 said:
Boiling a kettle for a few hours is not very ROI.
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I dont understand?

You want to spend money on a Victron shunt and that s better ROI than just measuring your kWh output of the battery by connecting a fixed load, multiplying by the time it rain to get the energy output?

If it is 100W load and it ran for 10 hours. Then you have a 1kWh battery. etc. Its all free. Why is a Victron shunt better ROI?
 
wingnut771 said:
A couple of years ago when I did a road trip around the country.

Yes, it looks like there are a lot when you look at the map, now zoom in and see your options. Take dbn for example.
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You have the charger at your house also, which is any socket.

You have a car with a range of 300km plus. Do you drive from one side of Durban to the next everyday? Even if you did, there is a charger within 300km of Durban.
 
denmendez65 said:
I dont understand?

You want to spend money on a Victron shunt and that s better ROI than just measuring your kWh output of the battery by connecting a fixed load, multiplying by the time it rain to get the energy output?

If it is 100W load and it ran for 10 hours. Then you have a 1kWh battery. etc. Its all free. Why is a Victron shunt better ROI?
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It doubles up as a SOC monitor for the 20kWh bank.

How do you know it ran for 10 hours?
 
denmendez65 said:
You have the charger at your house also, which is any socket.

You have a car with a range of 300km plus. Do you drive from one side of Durban to the next everyday? Even if you did, there is a charger within 300km of Durban.
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What happens when the stellenbosh professors get their wish and taxis become electrified? Anyway, who is saying there are not enough chargers?

What I am saying is the power of the chargers suck balls. Proper countries have 400kW, we have 50kW because we are a backwater shithole.
 
wingnut771 said:
It doubles up as a SOC monitor for the 20kWh bank.

How do you know it ran for 10 hours?
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Its a waste of money when you already have SA or HA or Tuya. And you have BMS that tells you also.

A timer? You connect a load that is close to the max power output of the battery to shorten the time to do the test. So say 2 hours. Something that would pull 50A is the limit of the BMS is 100A.

Start the timer and come check on it in the last hour at 10 minute intervals to see if the battery has killed the load. I would check in the last 30minutes at 10 minute intervals. Then its only 3 visits or 3 checks.

Simple as that. There is a hundred different ways you can do this test.

He has a small inverter for that battery. Just hook up the inverter and watch TV till it goes dead. Start your timer when you turn on the TV and the TV will go off when battery dead. Factor in the inveter draw.
 
denmendez65 said:
Its a waste of money when you already have SA or HA or Tuya. And you have BMS that tells you also.

A timer? You connect a load that is close to the max power output of the battery to shorten the time to do the test. So say 2 hours. Something that would pull 50A is the limit of the BMS is 100A.

Start the timer and come check on it in the last hour at 10 minute intervals to see if the battery has killed the load. I would check in the last 30minutes at 10 minute intervals. Then its only 3 visits or 3 checks.

Simple as that. There is a hundred different ways you can do this test.

He has a small inverter for that battery. Just hook up the inverter and watch TV till it goes dead. Start your timer when you turn on the TV and the TV will go off when battery dead. Factor in the inveter draw.
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A TV is not a constant load.

Ok I concede, I've just always wanted one and wanted to live vicariously through another.
 
wingnut771 said:
A TV is not a constant load.

Ok I concede, I've just always wanted one and wanted to live vicariously through another.
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I wanted one. Perfect for the GELs but damn thing only does Bluetooth.

And its 1k. I mind as well get the dongle for that price and estimate SOC off the battery voltage.
 
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