![]() Most of the build consists of bolting things together and configuring some software. This prototype is completely built from off-the-shelf parts. Add more batteries and hope we don't get too many cloudy days in a row.Intelligently shut-down during low-use hours (e.g.If we end up having too much power loss down-time we might do a couple of things: Include inefficiencies in the battery charging and discharging and now we're probably down to around 1.5 W or less, and that's assuming the panel is mounted in an ideal location! It's also likely that the claimed 50 W of the panels we bought were a marketing fiction. We're using a 50 W panel, which may seem oversized, but consider the shortest day of the year in Oakland, CA being (TODO check) 8 hours, that cuts the power input to 1/3 of total on time (actually less given no useful sun right at sunrise and sundown) and consider that it may be entirely cloudy for those 8 hours, which can reduce the input to 10 W. Background: As of now, we dont have master data base regarding students at various levels, without which framing policies with regard to education and. If we assume an average usage of 2 W then that gives about 22 hours of usage with no charging at all: Now in actuality we're probably only going to get ~90% of that since we're not fully discharging to zero nor fully charging to max, since li-ion batteries can handle many more charge cycles when operated like this. The battery capacity of this node is 3.7 V * 3.3 Ah * 4 = ~48.84 Wh Maxing out the 4G bandwidth from one wifi-connected device takes about 1.5 W and maxing out with 10 devices all running internet speed tests takes about 4 W. The 300 node A Franklin R910 4G LTE wireless hotspot Four 3300 mAh li-ion batteries A flexible 50W ETFE solar panel A modified Sparkfun Sunny Buddy MPPT. The Franklin R910 is a very low-power device, using less than 0.5 W with 4G LTE and WiFi active and a couple of connected WiFi clients. A weather-proofed aluminum box for the electronics.An aluminum frame for stabilization and mounting.Two semi-directional WiFi panel/patch antennas. ![]() Two external omni-directional 4G LTE antennas.A modified Sparkfun Sunny Buddy MPPT solar battery charger.A Franklin R910 4G LTE wireless hotspot.It sacrifices low build complexity to achieve the low cost and light weight. This is our low-cost, light-weight prototype. We currently have two prototypes meant to test out two opposite extremes in terms of power consumption, weight and cost.Ĭurrently both prototypes are designed to be pole-mounted though the $300 node is also designed to be suitable for strapping to a tree. These nodes provide high bandwidth internet connectivity backed by 4G LTE connections and are a separate project from the disaster.radio nodes which are also solar+battery powered but does not route general purpose IP traffic to the internet. This repo documents the solar and battery powered mesh nodes used by sudo mesh.
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