Below are data collected on the charging behaviour.

The whole exercise sparks from the observation that MPPT solar charger recording a mean 6-9W Solar output from my 2 x 150W solar panel in full sun coverage. It strike me that when the battery bank is full, we don’t pull the full power out from the panels. I want to know how much power the solar panels can push out at different time of the day, especially when I’ve only 3-4 hours of direct sunlight, is it sufficient to charge up my battery bank.

[table] Time,Panel(W),Battery(V),Load(W),Charging(A)
08:00,8,-,32,-
11:00,17,11.8,32,-
12:00,24,11.6,32,-
12:30,32,11.7,32,-
13:30,48,12.1,35,0.7
14:20,72,12.6,39,2.4
15:10,92,13.0,43,3.6
15:38,140,13.3,47,6.5
17:30,14,12.5,37,0
17:50,12,12.4,37,0
18:15,6,12.2,35,0
18:45,0,12.0,35,0
20:10,0,11.3,24,0
20:40,0,10.2,21,Beep
08:00,9,11.7,0,0
09:00,15,12.0,0,1.1
10:00,23,12.3,0,1.6
10:30,23,12.4,0,1.6
11:00,18,12.5,0,1.3
12:20,30,12.9,0,2.2
12:50,40,13.1,0,2.8
15:30,7,13.4,0,0
17:14,6,13.5,0,0
[/table]

I’ve 2 X 12V7.2Ah battery in the bank ~ 14.4Ah.
Day 1 test, Battery provided power to the LED strip after sun down for 3 hours. est 8.7Ah (2.9A for 3Hr), about 70% drain.
Day 2 charging, without load, both battery got fully charged well before 3pm. All this without direct sunlight.

The Panels should have lots of juice left to charge more batteries. Will build a bank of 10×7.2Ah battery to provide 12hours growth light for this system.

Lets compare cost effectiveness  between Car Battery and SLA Battery in Solar Storage Project.

In Singapore, a new 12V45Ah Car Battery cost $100, while a new 12V7.2Ah SLA Battery cost $19.

For SLA Battery, 12V7.2Ah is the sweet spot, its most common and has best Px/Capacity ratio compare to other voltage/capacity combination.

[su_table]

Compare	Car Battery	SLA Battery
Type	12V45Ah	12V7.2Ah
Price	$100	$19
Save Discharge	30%	80%
Usable	13Ah	5.76Ah
Size	Big 207Lx175Wx190H 30KG	Small 150Lx65Wx93H 1.22KG

[/su_table]

3 x 7.2Ah SLA Battery is able to do the job of a 45Ah Car battery at smaller cost, space and weight.

SLA 12V12Ah Discharge Time VS Discharge Current

State of Charge on charging

State of Charge on dis-charging

Car Battery

Car Servicing cost.

1300 – Front Suspension

800 – Back Suspension

730 – Engine Mount

680 – Steering wheel balancing 

600 – Tire replacement

8000 – Airbag

If -deregister on 1st Oct 2015 –

Total Rebate Amount:	01 Oct 2015 $28,121.00
Total Rebate Amount:	06 Aug 2019 $16,158.00

Hong Leong Finance balance loan as of 21 Aug 2015 is $33,120.

sgCarmart 2009 Nissan Presage resale price is around $70,000

Citroen take in price $52,000

Enquire PARF/COE Rebate for Registered Vehicle
Vehicle Owner Particulars
Owner ID Type:	Singapore NRIC
Owner ID:	S6902348G
Vehicle Details
Vehicle No.:	SJS2835B
Vehicle to be Exported:	Yes
Intended De-registration Date:	06 Aug 2019
Vehicle Make:	NISSAN
Vehicle Model:	PRESAGE 2.5 HIGHWAY STAR 4AT
Primary Colour:	Silver
Manufacturing Year:	2009
Engine No.:	QR25803815A
Chassis No.:	JN1TAAU31Z0100568
Maximum Power Output:	120.0 kW  (160 bhp)
Open Market Value:	$32,316.00
Original Registration Date:	07 Aug 2009
First Registration Date:	07 Aug 2009
Transfer Count:	1
Actual ARF Paid:	$32,316.00
Intended PARF Rebate Details
PARF Eligibility:	Yes
PARF Eligibility Expiry Date:	06 Aug 2019
PARF Rebate Amount:	$16,158.00
Intended COE Rebate Details
COE Expiry Date:	06 Aug 2019
COE Category:	B – Car (1601cc & above)
COE Period(Years):	10
QP Paid:	$18,501.00
COE Rebate Amount:	$0.00
Total Rebate Amount:	$16,158.00

22 Aug 2015

Resale value of Nissan Presage Aug 2009 car with $126K milage – $54-57K

Citroen Grand C4 Picasso (Diesel) – $132,988

Citroen Grand C4 Picasso (Patrol) – $143,988

Mazda 5 – $124,888

Mazda Biante – $137,888

nohup ping -s google.pl | xargs -n1 -i bash -c 'echo `date +"%Y-%m-%d %H:%M:%S"`" {}"' &