DIY OG Solar install

lexity said:
Interesting.


So what would 'trip' the system?

If too much water flows through the pipe, it creates back pressure and the outlet flap closes.
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If too much water is sucked from the system, some pipe or fitting would burst. You can't for example draw 6kW from a 5kW inverter, that would trip. You can however, potentially, draw 6kW from a 5kWh battery (assuming the battery is rated 1.5C).

Quite surprisingly this is all covered in the post you refuse to read.
 
leon.davibe said:
The hour part 1000w for an hour is 1000watt hours

If you run it for 30min you consumed 500watt hours

ie running a lower watt item lets say a tv 100w, u would need to run it for ten hours to be equal to a 1000watt item running for an hour

focus on the HOUR of kwH
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why you answering me ?
 
lexity said:
Interesting.


So what would 'trip' the system?

If too much water flows through the pipe, it creates back pressure and the outlet flap closes.
Click to expand...
The inverter can only handle 5000w so if you try and power 6000w it would trip

The battery can handle 5000w 1c so it will trip with the same load ie battery and inverter is nicely matched

The battery can carry that 5000w for an hr long 5kwH (focus on the hour)

So lets take the water example lets say the inverter can handle 83.3litres a minute if you have it pump 83L per minute it would empty the battery in an hour cause the battery only has 5000L

But if you use 8.3L then you will empty the tank in 10hrs

The same way the inverter can handle 5000w the battery can do 5000w for an hour or 2500w for 2 hours
Or 1000w for 5hrs

Or 50w tv for 100 hours

This is all perfect world examples naturally to drive the point in easy to understand way
 
leon.davibe said:
The inverter can only handle 5000w so if you try and power 6000w it would trip

The battery can handle 5000w 1c so it will trip with the same load ie battery and inverter is nicely matched

The battery can carry that 5000w for an hr long 5kwH (focus on the hour)

So lets take the water example lets say the inverter can handle 83.3litres a minute if you have it pump 83L per minute it would empty the battery in an hour cause the battery only has 5000L

But if you use 8.3L then you will empty the tank in 10hrs

The same way the inverter can handle 5000w the battery can do 5000w for an hour or 2500w for 2 hours
Or 1000w for 5hrs

Or 50w tv for 100 hours

This is all perfect world examples naturally to drive the point in easy to understand way
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Is the inverter measured in 'kw' or 'kwh'?

I think it's 'kw'.

Shouldn't it be in 'kwh'?
 
lexity said:
Is the inverter measured in 'kw' or 'kwh'?

I think it's 'kw'.

Shouldn't it be in 'kwh'?
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Inverter is kW. Battery is kWh. Once again all covered in the post you won't read.

Watt is a measure of power. Watt-hour is a measure of energy.
 
This got me in the same type of discussion

I kinda knew the hours portion in my head and do the calculation as such

Count all the watts ie all my load is 600w so multiply it by 4hrs and know i would use 2400w would have 2600w left

But not quite i used 600wh for 4 hrs and thus the equivelant of 2400wh or 2400w for an hour if you like

My calculation makes sense to me as long as the hours come into it at some point , but not saying the H means that we lose track of the fact that it is part of the equation

And causes misunderstanding

It is kinda like knowing x equals 1

And then in discussions never mention x

And just say i used 10 instead of 10x
 
lexity said:
Is the inverter measured in 'kw' or 'kwh'?

I think it's 'kw'.

Shouldn't it be in 'kwh'?
Click to expand...
The inverter is kw it only matters how much it can handle

The battery has two sides the energy stored in kwh ie 5kwh

And then the c rating that indicates the watts it can handle

1c means you can use all its capacity in 1hr meaning you could pull 5000w constant

And thus 0.5c means constant 2500w but often these can handle 5000w but not extended time ie if you boil the kettle for a few minutes and use 5000w it should be fine but running the oven +++ for a constant 5000w for more than 30min might be a problem.

It also matters what the 0.5c applies to, ie you get some batteries that can handle 1c discharge and 0.5c charge rate (well most bms's tend to be configured like this anyway)

But for most we aim to go through shedding , so we aim for at most 0.5c in 2hrs shedding and in 4hrs 0.25c

So the 0.5c not really a big problem, as long as we are aware of this

The manuals sometimes has requirements to run more than 0.5c time/temp for example
 
leon.davibe said:
The inverter is kw it only matters how much it can handle

The battery has two sides the energy stored in kwh ie 5kwh

And then the c rating that indicates the watts it can handle

1c means you can use all its capacity in 1hr meaning you could pull 5000w constant

And thus 0.5c means constant 2500w but often these can handle 5000w but not extended time ie if you boil the kettle for a few minutes and use 5000w it should be fine but running the oven +++ for a constant 5000w for more than 30min might be a problem.

It also matters what the 0.5c applies to, ie you get some batteries that can handle 1c discharge and 0.5c charge rate (well most bms's tend to be configured like this anyway)

But for most we aim to go through shedding , so we aim for at most 0.5c in 2hrs shedding and in 4hrs 0.25c

So the 0.5c not really a big problem, as long as we are aware of this

The manuals sometimes has requirements to run more than 0.5c time/temp for example
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I don't see why the inverter is not a per hour rating. Just like I still don't see why the storage is a per hour rating.

Storage is storage. Transport/transfer (at a particular rate) is something else. To my mind, at least.
 
lexity said:
I don't see why the inverter is not a per hour rating. Just like I still don't see why the storage is a per hour rating.

Storage is storage. Transport/transfer (at a particular rate) is something else. To my mind, at least.
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It's all in the post you refuse to read.

But here's another example. If I asked you how much you can bench press, would you answer me in a per hour rating?
 
leon.davibe said:
The inverter can only handle 5000w so if you try and power 6000w it would trip
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Inverter does not "trip". A CB rated correctly will protect the inverter from damage. The inverter will simply burn out.
leon.davibe said:
The battery can handle 5000w 1c so it will trip with the same load ie battery and inverter is nicely matched
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Ditto for a battery. A battery will deliver until it is empty, even if it overheats and gets damaged. It is a CB that will trip at a rated current to protect the battery.
 
Wow, I can't believe you guys are still entertaining this.... Uhm.. Person

You can lead a horse to water but...
 
lexity said:
I don't see why the inverter is not a per hour rating. Just like I still don't see why the storage is a per hour rating.

Storage is storage. Transport/transfer (at a particular rate) is something else. To my mind, at least.
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A per hour rating on an inverter would say what ?

Endurance ?

can run for x hours at max output until it fails like ssd hard drives that has an avg MTBF to see a failure and it is an avg some will fail sooner others later

So pointless imo

At best they can say what load it can handle and what is the overload capabilities ie double for x milliseconds 110% for 5min
 
leon.davibe said:
A per hour rating on an inverter would say what ?

Endurance ?

can run for x hours at max output until it fails like ssd hard drives that has an avg MTBF to see a failure and it is an avg some will fail sooner others later

So pointless imo

At best they can say what load it can handle and what is the overload capabilities ie double for x milliseconds 110% for 5min
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Well, the load is transient, even if its constant.

If an inverter stores nothing, why would you not give a rating in terms of rate of throughput/inversion?

What does '2000w' tell you about the inverter.

Try not to dub anything in.
 
Geoff.D said:
Inverter does not "trip". A CB rated correctly will protect the inverter from damage. The inverter will simply burn out.

Ditto for a battery. A battery will deliver until it is empty, even if it overheats and gets damaged. It is a CB that will trip at a rated current to protect the battery.
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Inverter has overload protection so it simply shuts down when you overload it i actually have mine set to auto restart when it does , i have triggered it a few times , normally when i have too much running ie exceeding the 5kw in bypass mode and when shedding hits i am over the 5kw

To protect with a CB is actually very hard ie a breaker has to exceeded for some time before it trips , sure if you exceed the amps with a dead short it trips immediately , but with overload you can have that CB humm for a while before it trips

So you would have to have a lower amp rating to actually trip at 5000w but then you lose the ability to actually run max amps for extended periods


The same for batteries the bms has overcurrent protection and will trip long before a CB will trip
 
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lexity said:
Well, the load is transient, even if its constant.

If an inverter stores nothing, why would you not give a rating in terms of rate of throughput/inversion?

What does '2000w' tell you about the inverter.

Try not to dub anything in.
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That is its specs the throughput is 2000w ie it can transform from dc to ac to meet a load of 2000w sure it can handle surges for short periods that you will find elsewhere in it manual

if it can't handle the 2000w sustained and can just handle 1000w sustained

Then it should be labeled as a 1000w inverter with surge to 2000w

So the specs of inverters tell us all that we need to know
 
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