Currently the ideal balance of price, performance and availability of off the shelf components is 48v dc power. There is a telecom industry standard (perhaps o

Currently the ideal balance of price, performance and availability of off the shelf components is 48v dc power. There is a telecom industry standard (perhaps only loosely standardized) for DC converters which are called "isolated DC-DC converters bricks."[2]. These are reasonably priced and reasonably high efficiency DC converters that fit into a set of standard form factors, e.g. 1/4 brick, 1/2 brick, etc. They are small sealed modules and a variety of outputs ratings are available for < $100 with efficiency > 85% and many newer examples are > 90% efficient. The setup I've settled on is the following, based on 48v nominal[2] system. Solar Array 80-100v | Solar Charger | LiFePo4 Battery [40-53v] | Circuit Protection | <- Standard house wiring to point of use | | --- [12v DC Brick] -- short wire --> 12v devices | | --- [5v DC Brick] -- short wire --> 5v devices Note that multiple devices could run on a single DC brick. It can, for example, provide an array of USB ports for devices to source power. The 5v or 12v power wiring is short so there isn't a need for oversized wire to combat voltage drop. 1. There are lots of sources for dc-dc "brick" converter modules, such as these: https://www.artesyn.com/power-supplies/cat/148/isolated-dc-dc-converters-for-telecommunications-applications https://www.artesyn.com/power-supplies/cat/148/isolated-dc-d... 1.1 Another affordable and available option is mean-well chassis-mount dc converters like this one: https://www.digikey.com/en/products/detail/mean-well-usa-inc/RSD-30H-5/7706233 https://www.digikey.com/en/products/detail/mean-well-usa-inc... 2. "48v nominal" means anywhere from something like 44v to 60v depending on battery chemistry, state of charge and current loads on the system.