I wrote a reply to this yesterday but apparently never pushed 'submit'. Lame!
Shield HP, Recharge rate, Power Drain, and Energy Multiplier are all configurable settings in the mod. One important thing to know, 1 unit of shield is 1kj * energy multiplier.
Power Drain, which is the power it takes to keep a shield running and fully charged, is a % of total Shield HP. You can set it as low a .1%, but it defaults to 10%. Thus, a shield with 10,000 HP takes 1 MW to keep powered when idle. At .1%, it would take 10kW.
Energy Multiplier defaults to 2. It can be set as low as 0.01 and as high as 100. So if you have a 100 HP Shield with a 2 multiplier, the shield actually takes 200KJ to fully charge. With a 0.01 multiplier, that same shield would only take 2Kj to charge. This setting also affects charge speed under the covers. If that 100 HP shield is configured to recharge at 10HP per second, then it would, with a multiplier of 2, charge at 20KW. With a 0.01 multiplier, it would take 200 watts. Energy Multiplier isn't a number you really need to think about. If you say "I want a 200 HP shield that recharges at 20HP/s" then the game will make that happen and the energy costs will just change in the background. I explain it here just to show that there is something going on in the background.
These settings all take a restart of the game to change, but you can make the power impact of shields so small that it may as well not exist.