On-grid domestic battery storage

EVandPV

Starfrog said:
the last time I went fishing was back in the 1980’s maybe I’ll take it up when I’m up there full time  

The trout fishing is fantastic up there ! 😉

Solarchaser

chamelion said:

Very limited and specific use case here but I've found something interesting...
I had switched to go faster tariff from agile. I have the batts charge up to 100% during the 5.5p 830pm - 130am slot, and from 130 onwards they contribute to the house. 

I previously had it trickle contributing - approx 300/350 watts to lower my profile for the day. However last night I bumped that to 1500w (my home baseline over 2500w) and got 15% more power out of them... 
I'll try again tonight with 2kw output. 

Sum of it is if you're doing something similar on go, sounds like you get more efficiency at higher wattage contributions rather than trickling. 

I'm not exactly sure what you mean.
Are you saying that you only usually get 6kw of discharge and now you get 7kw?

chamelion

Solarchaser said:

chamelion said:

Very limited and specific use case here but I've found something interesting...
I had switched to go faster tariff from agile. I have the batts charge up to 100% during the 5.5p 830pm - 130am slot, and from 130 onwards they contribute to the house. 

I previously had it trickle contributing - approx 300/350 watts to lower my profile for the day. However last night I bumped that to 1500w (my home baseline over 2500w) and got 15% more power out of them... 
I'll try again tonight with 2kw output. 

Sum of it is if you're doing something similar on go, sounds like you get more efficiency at higher wattage contributions rather than trickling. 

I'm not exactly sure what you mean.
Are you saying that you only usually get 6kw of discharge and now you get 7kw?

Basically yep. Not 7 (7.2kw system with 90% DoD) but there's a marked increase in total amount squeezed out the batteries when running at higher wattages. 

Starfrog

so how do I achieve that ?

Solarchaser

chamelion said:

Solarchaser said:

chamelion said:

Very limited and specific use case here but I've found something interesting...
I had switched to go faster tariff from agile. I have the batts charge up to 100% during the 5.5p 830pm - 130am slot, and from 130 onwards they contribute to the house. 

I previously had it trickle contributing - approx 300/350 watts to lower my profile for the day. However last night I bumped that to 1500w (my home baseline over 2500w) and got 15% more power out of them... 
I'll try again tonight with 2kw output. 

Sum of it is if you're doing something similar on go, sounds like you get more efficiency at higher wattage contributions rather than trickling. 

I'm not exactly sure what you mean.
Are you saying that you only usually get 6kw of discharge and now you get 7kw?

Basically yep. Not 7 (7.2kw system with 90% DoD) but there's a marked increase in total amount squeezed out the batteries when running at higher wattages. 

That is strange right enough, id put it down to a hiccup at this point to be honest, it's definitely not what I've found.
The only time I've had more than the 8.5kwh of discharge on my system is on sunnier days when after discharging for some of the morning its charged up by solar, and so discharges again later.

chamelion

Solarchaser said:

chamelion said:

Solarchaser said:

chamelion said:

Very limited and specific use case here but I've found something interesting...
I had switched to go faster tariff from agile. I have the batts charge up to 100% during the 5.5p 830pm - 130am slot, and from 130 onwards they contribute to the house. 

I previously had it trickle contributing - approx 300/350 watts to lower my profile for the day. However last night I bumped that to 1500w (my home baseline over 2500w) and got 15% more power out of them... 
I'll try again tonight with 2kw output. 

Sum of it is if you're doing something similar on go, sounds like you get more efficiency at higher wattage contributions rather than trickling. 

I'm not exactly sure what you mean.
Are you saying that you only usually get 6kw of discharge and now you get 7kw?

Basically yep. Not 7 (7.2kw system with 90% DoD) but there's a marked increase in total amount squeezed out the batteries when running at higher wattages. 

That is strange right enough, id put it down to a hiccup at this point to be honest, it's definitely not what I've found.
The only time I've had more than the 8.5kwh of discharge on my system is on sunnier days when after discharging for some of the morning its charged up by solar, and so discharges again later.

Running at 2kw output last night yielded 6.2kwh. At 1.5 it was 6, at 300w it was 5.8!!
Definitely a correlation. I'd chalk it down to a set 'overhead' that doesn't vary based on output, so the longer you have the unit on the more you're wasting to cover the overhead... 

EVandPV

chamelion said:

Solarchaser said:

chamelion said:

Solarchaser said:

chamelion said:

Very limited and specific use case here but I've found something interesting...
I had switched to go faster tariff from agile. I have the batts charge up to 100% during the 5.5p 830pm - 130am slot, and from 130 onwards they contribute to the house. 

I previously had it trickle contributing - approx 300/350 watts to lower my profile for the day. However last night I bumped that to 1500w (my home baseline over 2500w) and got 15% more power out of them... 
I'll try again tonight with 2kw output. 

Sum of it is if you're doing something similar on go, sounds like you get more efficiency at higher wattage contributions rather than trickling. 

I'm not exactly sure what you mean.
Are you saying that you only usually get 6kw of discharge and now you get 7kw?

Basically yep. Not 7 (7.2kw system with 90% DoD) but there's a marked increase in total amount squeezed out the batteries when running at higher wattages. 

That is strange right enough, id put it down to a hiccup at this point to be honest, it's definitely not what I've found.
The only time I've had more than the 8.5kwh of discharge on my system is on sunnier days when after discharging for some of the morning its charged up by solar, and so discharges again later.

Running at 2kw output last night yielded 6.2kwh. At 1.5 it was 6, at 300w it was 5.8!!
Definitely a correlation. I'd chalk it down to a set 'overhead' that doesn't vary based on output, so the longer you have the unit on the more you're wasting to cover the overhead... 

Strange !
You'd have thought it would be the other way around with higher wattages creating more heat. Or do the cells perform better when warmer ??

mickyduck55

Mine certainly charge faster when they are warmer.

EVandPV

mickyduck55 said:

Mine certainly charge faster when they are warmer.

Yeah, charge power drops when the temp falls below a certain level.
I'm guessing efficiency is better at certain temp ranges ??

Solarchaser

chamelion said:

Solarchaser said:

chamelion said:

Solarchaser said:

chamelion said:

Very limited and specific use case here but I've found something interesting...
I had switched to go faster tariff from agile. I have the batts charge up to 100% during the 5.5p 830pm - 130am slot, and from 130 onwards they contribute to the house. 

I previously had it trickle contributing - approx 300/350 watts to lower my profile for the day. However last night I bumped that to 1500w (my home baseline over 2500w) and got 15% more power out of them... 
I'll try again tonight with 2kw output. 

Sum of it is if you're doing something similar on go, sounds like you get more efficiency at higher wattage contributions rather than trickling. 

I'm not exactly sure what you mean.
Are you saying that you only usually get 6kw of discharge and now you get 7kw?

Basically yep. Not 7 (7.2kw system with 90% DoD) but there's a marked increase in total amount squeezed out the batteries when running at higher wattages. 

That is strange right enough, id put it down to a hiccup at this point to be honest, it's definitely not what I've found.
The only time I've had more than the 8.5kwh of discharge on my system is on sunnier days when after discharging for some of the morning its charged up by solar, and so discharges again later.

Running at 2kw output last night yielded 6.2kwh. At 1.5 it was 6, at 300w it was 5.8!!
Definitely a correlation. I'd chalk it down to a set 'overhead' that doesn't vary based on output, so the longer you have the unit on the more you're wasting to cover the overhead... 

So you have just set it to output a set amount?
And so you are exporting most of the output?

How long have you been tracking this for?

As Ev and PV said it should be more efficient lower down as not as much power is lost to heat. 
Unless of course you have it in an unheated part of the house and so the heat you generate actually helps get past the inefficiency of running it all cold