#1 June 28, 2017 17:07:20

dawkinsp
Registered: 2017-04-14
Posts: 9
Reputation: +  0  -
Profile   Send e-mail  

Battery storage first impressions

Hard to say but possible.

http://batteryuniversity.com/learn/article/elevating_self_discharge



I notice your Battery Temps seem particularly high. Can you graph battery temp for the month. What is the minimum average night time battery temperature you have?


Offline

#2 July 14, 2017 20:45:12

dawkinsp
Registered: 2017-04-14
Posts: 9
Reputation: +  0  -
Profile   Send e-mail  

Battery storage first impressions

Capacity Left at lowest point.
FULL means it was charged to 100% and then discharged to 05:00 the next day.
EMPTY indicates if the battery did not manage until 05:00 and the time it ‘failed’

2017-02-01 05:00 16% FULL
2017-02-02 05:00 47% FULL
2017-02-03 05:00 43% FULL
2017-02-04 05:00 42% FULL
2017-02-05 05:00 36% FULL
2017-02-06 05:00 45% FULL
2017-02-07 05:00 38% FULL
2017-02-08 05:00 54% FULL
2017-02-09 05:00 33% FULL
2017-02-10 05:00 46% FULL
2017-02-11 05:00 54% EMPTY @21:09 20%
2017-02-12 05:00 14% FULL
2017-02-13 05:00 58% FULL
2017-02-14 05:00 55% FULL

Attachments:
attachment capacity.png (153.7 KB)

Offline

#3 July 14, 2017 20:47:45

dawkinsp
Registered: 2017-04-14
Posts: 9
Reputation: +  0  -
Profile   Send e-mail  

Battery storage first impressions

Charge Discharge usage.

Attachments:
attachment usage.png (191.6 KB)

Offline

#4 July 14, 2017 20:50:00

dawkinsp
Registered: 2017-04-14
Posts: 9
Reputation: +  0  -
Profile   Send e-mail  

Battery storage first impressions

Inner Temps

Attachments:
attachment temp.png (115.4 KB)

Offline

#5 July 15, 2017 13:52:45

BackYardSolar
From: Surrey, on Gatwick flight path
Registered: 2015-05-30
Posts: 46
Reputation: +  0  -
Profile   Send e-mail  

Battery storage first impressions

Hi dawkinsp,

I was looking at your capacity results and I was thinking that as you have been reaching 100% most days for more than a few hours then you need a bigger battery.

My thinking is that ideally you don't need to ever get to 100% capacity as 90% of a 10kWh battery would be far better than 100% of a 7kWh battery. Also the 85% discharge you are getting some days maybe avoided with greater capacity. Hours at 100% means a lot of potential storage is lost.

Regards BYS.



SolarEdge SE4000 inverter, 16 x Romag powerglaz 235W panels. South facing at 30 degree angle in Surrey just East of Gatwick and under the flight path.

ESS AC coupled system using a Victron Multiplus 24V/1600VA Inverter/Charger - 8.16kW Trojan 875 battery bank.

Offline

#6 July 15, 2017 14:57:09

dawkinsp
Registered: 2017-04-14
Posts: 9
Reputation: +  0  -
Profile   Send e-mail  

Battery storage first impressions

Hi BYS,

I totally agree with you on that and I am just waiting for the prices to drop a little bit more before adding to the battery capacity.

Kind Regards,

dawkinsp

Offline

#7 Nov. 16, 2017 11:25:30

rogerhoward
From: Southend
Registered: 2012-08-01
Posts: 273
Reputation: +  0  -
Profile   E-mail  

Battery storage first impressions

In Cornwall? Centrica are offering battery storage to 100 Cornish homes with solar PV. 300 householders have already expressed an interest though, so if you're interested don't delay!
https://www.solarpowerportal.co.uk/news/centrica_looking_to_role_out_solar_plus_storage_in_cornwall



Economy 10 tariff provides 6.9p/kWh off-peak import between 12am-5am, 1pm-4pm and 8pm-10pm; http://www.pvoutput.org/aggregate.jsp?id=21047&sid=18934&v=2&t=m on approx. 63% off-peak usage, 22% solar usage, and 15% peak-rate usage.
1,900kWh annually is exported, mostly in summer, on approx. 3,200kWh generation. Approx. 4,500kWh/year is imported, mostly for (a) winter and springtime off-peak Storage Heaters, and (b) off-peak hot water Immersion heating (which is “dumb”, i.e. not linked to the solar PV).
PV array is split East-West. Income is from Phase II 21p/kWh Feed-in-Tariff plus smart metered 3.2p/kWh Export Tariff.

Offline

Board footer

Moderator control

Powered by DjangoBB

Lo-Fi Version