[marktwain]

Freeplay does have a 12 volt standalone charging system available. It looks handy.

http://www.freeplayenergy.com/page-view.php?pagename=Freecharge-12v-link3

[Kartographer]

Here’s the set-up I am looking at:

http://www.amazon.com/HQRP-Monocrystalline-Controller-Regulator-Radiation/dp/B002WHQL2U/ref=pd_sim_ol_3

Then adding a inverter and a Deep Cycle battery and a inverter. Mount the whole thing on a two-wheel dolly.

I am also looking at this as a back-up:

http://www.amazon.com/gp/product/B001BKS3Z2/ref=s9_simh_gw_p23_d0_g23_i1?pf_rd_m=ATVPDKIKX0DER&pf_rd_s=center-3&pf_rd_r=1KY45AY7ZEF2PD473D1F&pf_rd_t=101&pf_rd_p=470938811&pf_rd_i=507846