How to store solar power - (drook) - (18) - Feb. 12, 2016, 12:15:23 PM EST
         Neat! -NT - (mmoffitt) - Feb. 12, 2016, 02:23:40 PM EST
         I don't know about that. - (a6l6e6x) - (3) - Feb. 12, 2016, 03:39:03 PM EST
             I'm guessing they leave the rocks loaded -NT - (drook) - (2) - Feb. 12, 2016, 03:46:49 PM EST
                 Unless they want to scale up capacity. - (a6l6e6x) - (1) - Feb. 12, 2016, 04:13:58 PM EST
                     I assume they mean leave the entire train, then go back down for another - (drook) - Feb. 12, 2016, 04:25:56 PM EST
         TANSTAAFL. - (Another Scott) - (12) - Feb. 12, 2016, 10:10:19 PM EST
             "and it takes so much energy to move the necessary mass" - (drook) - (11) - Feb. 13, 2016, 12:10:39 PM EST
                 The key benefits are simplicity and cost - (malraux) - (10) - Feb. 13, 2016, 12:25:07 PM EST
                     500K AA batteries ... that's a useful metric :-/ -NT - (drook) - Feb. 13, 2016, 01:05:03 PM EST
                     Dunno. I'm skeptical of things like this. - (Another Scott) - (7) - Feb. 13, 2016, 02:46:45 PM EST
                         The other big benefit - (drook) - Feb. 13, 2016, 03:41:17 PM EST
                         maybe I am missing something but when the battery is done you chuck it, that costs as well -NT - (boxley) - (5) - Feb. 13, 2016, 03:54:33 PM EST
                             Eneloops are rechargeable -NT - (malraux) - (4) - Feb. 13, 2016, 04:03:04 PM EST
                                 Yeah, but they don't last forever. Neither do locomotives though. :-) -NT - (Another Scott) - Feb. 13, 2016, 04:11:59 PM EST
                                 can they get recharged by running them down a hill? If not what is the cost of the recharge? -NT - (boxley) - (2) - Feb. 13, 2016, 05:57:07 PM EST
                                     The whole point is to store solar power, not to just generate power from locomotives. - (Another Scott) - (1) - Feb. 13, 2016, 07:49:51 PM EST
                                         Probably inefficient because . . . - (Andrew Grygus) - Feb. 13, 2016, 09:10:58 PM EST
                     Yeah, fill the damned things with sand . . . - (Andrew Grygus) - Feb. 13, 2016, 06:41:38 PM EST