Yearly Archives: 2016

20Jun/16

Importance Passion

In many motivational speeches and self improvement articles. We see there emphasis on doing something we are passionate on. 

The saying goes that doing something you liked and you will not work another day. 

It is always these passion thingy that we need to first finds out. What are things that is our real passionate about. 

07Jun/16

Action and Raction

Situation : Being the de facto solution provider to this customer. Everything is tie back to My company. From procurement, to delivery, maintenance and running of the whole IT. There is this mega project to tech refresh switches in the customer site. Started 2 years back. at that time, many existing switches were still new and under warranty. Decision was made not to include them in the refresh. 2 years has since past, these “new” switches are now “old”.  And since customer did not planned purchase warranty for these switches, conveniently point to us to also tech refresh these equipment.

Response : Been in the environment long enough, I see what is coming. basically no way out, I got angry knowing that I’ll be on the loosing end, both from customer perspective and from internal management perspective.

Retrospection : Problem started 2 years back. Insufficient written documentation and signoff before we move forward to next phase. Every step is in a rush, we’re being too accommodative. For good or for bad, agreement should be documented and not just verbal. This is proper Project Management. Customer is always right and they are now haunting us.

08May/16

Checkpoint firewall dbedit

Command line method of creating objects and rules for checkpoint firewall

Syntax is very raw. It support only creation of rules at back of policy. 

Require lots of manual checking and verification. 

07May/16

Grid Tie Inverter

Left my pair of 150W solar panel idling, charging the sets of SLA batteries for past few months. Not really doing much work.

Came across this from a friend’s sharing of Carousell post. Solar Grid Tie Systems  800w (Full Set) for $2400 Sparks me to dig deeper into what Grid Tie Inverter really is.. End up it is a MPPT device that convert Solar DC direct to AC and pushes power direct to my homes power line. It takes batteries out of the equation, which is very neat.


located this Grid Tie Inverter from Tao Bao.

太阳能 并网逆变器 光伏逆变器 Inverter 500W 送MC4接头一对. Set me back ~$130 plus shipping.

Gotten this power meter too. ~$10

img_3257.jpg

I have now modified and connect the pair of 150W Solar panel through this Grid Tie Inverter to my home power line.

It is pushing 150W max with good sun shinning on it. The yield is not great as I’ve only ~3hours direct sun on the panel everyday. Less then 0.5 kWh / day of use.img_3284.jpg

I did a cross check on SingPower electricity tariff which is now $0.18/kWH. I’m pulling less then 2kWH from the panel in 1 week. At this rate, my setup is not going to let me recovery my investment.

I NEED MORE SUN. Am now thinking should I move the panels towards the railing for more sun.