I have some simple questions that I have not been fully able to flush out in all my research and am hoping that someone will be able to give definitive, simple straightforward answers so I don’t make a costly mistake. (1) Of all the inverters what will be the best option for an off Grid Setup with a back up generator. I can see several options but I am not sure if I should be using a Quattro or and MultiPlus II. I want the generator to back stop the system in case the renewables are not enough to run the system and the batteries are getting low. I will be using a combination of Hydro, Wind and Solar.
Requirements
- Max current out put 300A (200 A house panel and 100 A Shed Panel)
- Output Voltage 240V to 120V
- Generator activation when batteries hit predetermined low level
- Battery Charging from Generator
- Battery Bank 48VDC
I have attached my rough design on what I plan to do. The battery bank will be built out of LifePo4 batteries creating a 48VDC system and storing around 9600 ah. The batteries will have an average normal discharge rate 320 A per hour with a peak over 1000a but will need to be under 10 mins.
- If the batteries are full and wind/hydro/solar are still producing power
- Does the MPPT prevent the extra power from over charging the batteries?
- If so what doe the MPPT do with the extra power? I known in some hydro system they have a burn off resister.
- Can multiple Autotransformers be placed in parallel? I have seen several references in post about needing multiples, but no one has explicitly said they can be used in parallel. I need to have a 200A circuit of 120V L1, L2 for the house.
- Is there any reasons why a Solar Charge Controller could not be used with a wind turbine if properly sized? They hydro turbine I plan to buy have been tested with the Victron MPPT(s) and they even recommend a model to be purchased based on what I buy from them. The wind turn bine has no suggestions from the manufacture.