GoSolr vs Solar

Kosmik said:
What is the actual question @Dolby ? I know we spoke a bit and I suggested a second battery as you appeared to be "capping" out , ie: excess solar.

If I recall you were getting something like 1.3kwp out of your array which gave you quite a nice haul but it dropped because your battery got full.

The second battery would take your total capacity to 5kva if I recall. You might have to balance it a bit to ensure bms balancing but you'd get the full potential output of your array with it.
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There’s no question.

I’m just saying you can’t use any size better with any size inverter
 
Speedster said:
If you say so. I guess when driving to Cape Town my odometer counts kilometres travelled and deducts whatever I travelled from a "unit" which is an expression. I.e. how many hours could I have travelled 100km/h.
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If you drove 50km/h for 30min and then 150km/h for 30min

The avg over that hour is 100km/h

Electricity is kinda worked out like that on prepaid meters

ie lets deduct from his "units" whatever he just use to boil the kettle ,what would that be avg kw if used over an hour

Or as we say kwh

ie your kettle at 2000w/2kw used the amount of energy in this 5min that would be equivelant to

0.166666667kw for an hour
 
Dolby said:
There’s no question.

I’m just saying you can’t use any size better with any size inverter
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Hmm I dunno, depends on the inverter. I know with the deye you can set pretty much anything but it would really boil down to configuration ability.
 
leon.davibe said:
If you drove 50km/h for 30min and then 150km/h for 30min

The avg over that hour is 100km/h

Electricity is kinda worked out like that on prepaid meters

ie lets deduct from his "units" whatever he just use to boil the kettle ,what would that be avg if used over an hour
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Why not just deduct how much energy he used? Surely that is much simpler. Count how many joules and say he used x amount of joules. Why the need to say what rate per hour that converts to?

Johnny bought 3 600 000 joules. Boiling the 2kw kettle for 5 minutes used 600 000 joules. Johnny has 3 000 000 joules left.
 
Dolby said:
So I can’t find the post , but someone said I was considering capacity with load when chatting about inverters and batteries .

The example was that I could could use (hypothetically) a 10kw inverter with 1kw battery or 1kw inverter with 10kw battery .

But I’ve realised it isn’t that simple and you do actually need to match have a minimum (maybe inverter dependant).

So I’m getting a 2nd 2.4kw battery next week
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Yup - I did say it’s probably inverter dependent . I found this :

Careful attention to detail must be used when designing battery systems. Batteries have limits to how much current can safely be used without causing excessive wear and tear or damage.
Having a battery bank that is too small for the inverter rating can lead to several issues.
• Unexpected system shutdowns.
• Damage to sensitive loads.
• Damage to system equipment.
• System not working totally.
• System not meeting expectations.
• Shortened lifespan of equipment.
• Warranty void (batteries used outside limits)
 
Dolby said:
Yup - I did say it’s probably inverter dependent . I found this :

Careful attention to detail must be used when designing battery systems. Batteries have limits to how much current can safely be used without causing excessive wear and tear or damage.
Having a battery bank that is too small for the inverter rating can lead to several issues.
• Unexpected system shutdowns.
• Damage to sensitive loads.
• Damage to system equipment.
• System not working totally.
• System not meeting expectations.
• Shortened lifespan of equipment.
• Warranty void (batteries used outside limits)
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Putting a 10l fuel tank on a shiny new Fortuner would work. You just won't be able to travel very far.
 
Speedster said:
Putting a 10l fuel tank on a shiny new Fortuner would work. You just won't be able to travel very far.
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That’s exactly what I thought - but it seems that is wrong advice. As above, a minimum is needed and I can’t get away with one battery (or 10l of fuel)

IMG_2986.jpeg
 
Dolby said:
That’s exactly what I thought - but it seems that is wrong advice. As above, a minimum is needed and I can’t get away with one battery (or 10l of fuel)

View attachment 1542665
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You can, depending on the size, discharge and load. But those are factors that you would know.

The biggest thing to consider are those 3 factors when there is no grid, then you're limited to the specifications of the battery without passthrough to cover you. If the battery bank exceeds the specifications of the inverter, then you're limited to the inverter specifications...
 
Dolby said:
That’s exactly what I thought - but it seems that is wrong advice. As above, a minimum is needed and I can’t get away with one battery (or 10l of fuel)

View attachment 1542665
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The US2000 batteries are 50Ah (i.e. 2.4kWh) batteries and have a max discharge current of 25A (i.e. 1.2kw) each. You can use one of them with that inverter but if you don't have any PV available the system will be limited to the battery limit. The battery will work, you just won't get the full capacity of the inverter.
 
Dolby said:
That’s exactly what I thought - but it seems that is wrong advice. As above, a minimum is needed and I can’t get away with one battery (or 10l of fuel)

View attachment 1542665
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I depends on the load

Ok so you never use the 5kw capacity because you know you only have a 2.5kwh battery and you want to last through 4hrs ie you never use any more than 500w in total ie tv internet lights etc

Then you are nowhere near the limits of the battery and you can use it trouble free

If you boil the kettle and use other devices the battery would switch off overload protection by bms

At worst discomfort is what you will experience

As you would have to reboot the inverter and be stuck without power for that time

Edit : what speedster said i wasn't aware the 2.4kwh battery you have is a 0.5c battery
 
Speedster said:
The US2000 batteries are 50Ah (i.e. 2.4kWh) batteries and have a max discharge current of 25A (i.e. 1.2kw) each. You can use one of them with that inverter but if you don't have any PV available the system will be limited to the battery limit. The battery will work, you just won't get the full capacity of the inverter.
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Look without being disrespectful, I’m going with the manufacturer on this.

I’m having issues and after checking configuration, they pin point that to be the issue.
 
Anyway I just wanted to point it out incase anyone else stumbles on the same issue . If people don’t agree - all good as well :)
 
Dolby said:
Look without being disrespectful, I’m going with the manufacturer on this.

I’m having issues and after checking configuration, they pin point that to be the issue.
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What issues were you having?
 
Speedster said:
Why not just deduct how much energy he used? Surely that is much simpler. Count how many joules and say he used x amount of joules. Why the need to say what rate per hour that converts to?

Johnny bought 3 600 000 joules. Boiling the 2kw kettle for 5 minutes used 600 000 joules. Johnny has 3 000 000 joules left.
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Yea we can buy Mj
 
Speedster said:
What issues were you having?
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Tripping issues and voltage drops unrelated to capacity. I posted on the Victron community forum and I’ll try get their reply for you tomorrow - but they said the same thing in that a minimum is required.
 
Dolby said:
Tripping issues and voltage drops unrelated to capacity. I posted on the Victron community forum and I’ll try get their reply for you tomorrow - but they said the same thing in that a minimum is required.
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Is your load exceeding 1.2 kW when there's no grid and it trips?
 
I’m also going to increase the battery cable size at the same time. So extra battery + thicker cable.
 
Mike Hoxbig said:
Is your load exceeding 1.2 kW when there's no grid and it trips?
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Nope.

400-500w if that.

But basically I’m not saying that IS the issue - but there was an earlier post that said hypothetically you can have a 10kw inverter with 1kw battery.

That gave me the impression that I could just upgrade capacity as I have money, as long as the inverter is large enough. They were both independent

So in my case I was planning on getting a 2nd battery anyway - I just assumed it would work correctly until that point
 
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