Gunagulla wrote: My battery and BMS and some other mods I did cost a bit under $12000 for ~17kWh usable capapcity
Is that what we would pay? I mean were you able to get it at that price because of the work you did your self?
Quote: Yes you could charge most of it's capacity in a bit over an hour, the last little bit is slower, but is best done with PV panels rather than a whacking great generator running at a fraction of its capacity.
The idea is that when the system is sized the generator is matched to the charge capacity of the battery bank. You run the generator to maximize its efficiency which is generally at about 80% of rated capacity.
When you say "best done with PV panels" is this because sunlight is free or some other reason?
The reason for the generator is primarily as back up but also to reduce the required size of the battery bank and hence reduce the capital cost of the system.
The system I'm working on at the moment needs about 1.5kW 24hrs per day but I want to design it so it can be scaled up to 5kW.
Quote: I would think efficiency would be in the mid 90% somewhere,
that is still pretty good.
Quote: certainly still way better than a Lead-acid battery that could not be charged at anywhere near that rate
Yeah lead acid won't cut it. I've already worked that out.
Quote: For a long life you probably want to limit discharge to 5-10kW, but it could do 20kW for many minutes at a time and up to 50kW for brief peaks. I'm sure that would knock efficiency down a fair bit, but that's the sort of treatment they get in electric vehicles.
Most of the loads I have to deal with at this stage are more constant in nature rather than peak. This is part of the problem I'm having since most systems are designed to provide power during the day and for peak periods of usage. Mostly in AP systems the duties are relatively constant. That may change later as more control systems vary pumping rates and turn blowers up and down.
The other challenge is the voltage to run the system at.
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