edf battery offer

Reed_Richards

Solarchaser wrote: »

In mid summer I could start a day with 30% battery. So not a full cycle.
Similarly in the murkier days, if the battery only gets to 80% or in theory. 99%, then it's not a full cycle.

Me too but I don't see why this is important. I would have thought that 3/4 of a cycle will give at least 3/4 of the wear on the battery that a full cycle would.

In any case, Scouselegend, with his/her ASHP, is using a lot of electricity and is more likely to drain her/his battery overnight.

michaels

Reed_Richards wrote: »

Me too but I don't see why this is important. I would have thought that 3/4 of a cycle will give at least 3/4 of the wear on the battery that a full cycle would.

In any case, Scouselegend, with his/her ASHP, is using a lot of electricity and is more likely to drain her/his battery overnight.

All the battery research shows that batteries last much longer (in terms of total lifetime energy charged and discharged) as you limit usage to 80-20 range or even less.

Reed_Richards

michaels wrote: »

All the battery research shows that batteries last much longer (in terms of total lifetime energy charged and discharged) as you limit usage to 80-20 range or even less.

But then you only get 60% of the capacity. I use 90% of the battery capacity because that is how it was set up for me. If it only last for 2/3 of the time then it's even stevens.

In any case, there is a setting on the inverter that allows me to change the minimum SoC but I don't think I can limit the maximum.

scouselegends

thanks all. Yes our ashp does obviously use a lot of electricity! One other query has anyone paid to increase the charge/discharge to 5.5kw or stuck to the 3.68kw (I think that’s right!). I’m told it’s about £600 to do this? Cheers

Solarchaser

I'm obviously not explaining myself very well, apologies.

I can only tell full cycles, not cumulative charge and discharge as solarman doesnt support it for me, so when I say cycle numbers, it's full cycles of the battery.... because it's the only data I have.

I have no data on the partial cycles.

That's why I was asking Nick about his, as he can see partial discharge as a cumulative number.

If for instance I had a 10kwh system and it was showing 50 cycles, but the cumulative discharge was 1000kwh, then I could say the micro cycles equal what full cycles output.

I just dont know what mine is

michaels

Reed_Richards wrote: »

But then you only get 60% of the capacity. I use 90% of the battery capacity because that is how it was set up for me. If it only last for 2/3 of the time then it's even stevens.

In any case, there is a setting on the inverter that allows me to change the minimum SoC but I don't think I can limit the maximum.

If you want max lifetime kWh then you achieve this with a bigger battery and less deep cycles. However given battery costs are expected to fall it may make more sense to get a smaller battery now, use it more intensively and replace it sooner when cells should be cheaper.

1961Nick

Solarchaser wrote: »

I'm obviously not explaining myself very well, apologies.

I can only tell full cycles, not cumulative charge and discharge as solarman doesnt support it for me, so when I say cycle numbers, it's full cycles of the battery.... because it's the only data I have.

I have no data on the partial cycles.

That's why I was asking Nick about his, as he can see partial discharge as a cumulative number.

If for instance I had a 10kwh system and it was showing 50 cycles, but the cumulative discharge was 1000kwh, then I could say the micro cycles equal what full cycles output.

I just dont know what mine is

If you had a 10kWh system showing 50 cycles you would have discharged 500kWh (less round trip losses).

Solarman calculates the cycles by dividing cumulative charge by the total battery capacity.....

Total charge energy: 1501kWh
Battery cycles: 125

(My battery capacity is 12kWh)

Solarchaser

Yeah, that's exactly what I was saying.
So if I had full cycles showing 500kwh, but cumulative of 1000kwh, then it would mean my mini cycles added up to 500kwh as well, so I'd be using the battery 50% full cycles and 50% micro cycles.

I'm trying to work out how many micro cycles I cant see.

From what you have said about yours, 12kwh system with 125 cycles is 1500kwh, (12x125=1500) since your total is 1501, then you are doing pretty much zero micro cycles.

Unless that 12kwh is 5 pylon batteries meaning 10kwh useable, in which case its 10x125 = 1250 so you are using full cycles 83% of the time (1250/1500 =0.83) and 17% micro cycles.

Your wife doesnt like the washing machine and tumble dryer as much as mine I guess.
My battery has been at 60% twice today, it's also went down under 30% twice, and it's now about 45%, so I've been doing quite a bit of micro cycles, I'd just love to know what it equates too.

Simple fact being I need a different system, as I'll never be happy with this lack of information.

Solarchaser

My sofar reads the battery cycles off the master battery.

So if I plugged on the battery I got second hand with the second hand sofar, it would tell me my cycles were 300+ as that's how many times that battery has been cycled.

Solarman doesnt tell me battery cycles due to age of my sofar I guess

01642

I went for this deal but I have noticed I am exporting 100 watt average to the grid doesn't matter so much in the day when using solar but at night time when they are off after 10 hours my 4.1kw battery has lost about 25% what is everyone else's export from the battery to the grid when solar power has switched off thanks