Thank you, Pete. I think I decided upon multiple 24 volt all DC "units/circuits". I am only putting a 320 max watt load on each unit/circuit...13.33 a= 320w/24v...2 -230 watt solar panels wired in series and 2 250 Ah batteries in series per "unit/circuit". I need to keep it simple because unskilled Haitians will have to service it until I can get back to Haiti. I do value your opinion on the following...I was going to pipe the whole building in 3/4" and 1/2" EMT, but since it's 24 volts, what is your opinion of just wiring it ( 24 volts) in just split loom plastic wire cover? no more than 4 wires in any piece of the split loom. (trying to save money) It is just lighting and fans...the only piece accessible to the public would be the switch leg. I agree with you I do need a couple of 120 volt inverter circuits to run AC tools and appliances should the need arise. The school will use laptop computers as money become available to purchase...I am building a lockable case for the computers where i will put in a 24 volt charging station for them, and step the voltage down to 19.5 to charge the computers inside the cabinet, but in my testing I find that DELL puts a chip in their computer so you have to use their charger. Right now the school has some Lenovo laptops, which allow me to charge using a stepdown transformer. But who knows about the future, so I should allow for future inverter use for the computers. Thank you for taking the time to answer.