Effect of a power "brown-out" on Mac hardware? PLEASE HELP!

Hi,

Please could someone help me to understand the effect of a power "brown-out" on Mac hardware?

I have an iMac 27" (Late, 2013).

I would like to use a solar powered battery device with a 150 Watt External modified sine wave inverter. According to the Mac website, my model will use approx. 78W when idle, and 180W at CPU Max.

So, because I live in South Africa, where we now have load-shedding (planned black-outs depending on national energy grid pressure) I have invested in an EcoBoxx 160 DC + (http://www.ecoboxx.co.za/pages/products.php?app_id=4).

My question is thus: If I use my Mac with the device, and it happens to demand more than the 150W generated by the EcoBoxx, would this cause damage to any of its component parts?

I will only be using MS Word on my Mac under these conditions, so I imagine that if I close all other applications then the power demand of the Mac should not approach CPU max?

Also, if I ran it through a surge protector, would this make a difference?

I would be extremely grateful for any advice or suggestions, as I am desperately trying to complete my PhD dissertation, and cannot afford to continuously suffer the effects of load-shedding!

Thanks and Warmest Greetings,

Clinton