I had a question for those of you in the know.
I want to experiment a little with LiFeYPo4 batteries for a solar off grid setup. Currently I use regular FLA batteries for a small back-up system, but I'm contemplating a much larger system for an off grid cabin and I want to do some research on LYP batteries because they seem like a much better option than FLA. If I can truly get 8000 Cycles at 50% DOD with a LYP battery, they would probably be cheaper in the long run then FLA
My plan is to get 4 100ah LiFeYPo4 batteries. The ones I’m looking at are these >http://www.alliancerenewableenergy.c...-LFP100AHA.htm
Next I plan on using a Morningstar TS-MPPT-60 charge controller with two 230 watt 24v panels. I don't expect much MPPT benefit other than the fact that the TS-MPPT-60 can be set to a custom charge setting and will down convert my panel's 24 volts to the battery bank's 12 volts, but what charge settings would I program into the TS-MPPT-60 for a LiFeYPo4 battery bank?
Next I have read that a BMS is not absolutely necessary if you Bottom Balance and only charge to 3.5 volts per cell, however none of the threads I have read actually cover how to bottom balance the battery bank. I assume I need a specific charger set up to charge one cell at a time (to a certain voltage?) and then a way to discharge each cell individually so that all the cells are at the same bottom voltage???? Any help on the proper way to bottom balance and what Items I will need to do it would be greatly appreciated.
Lastly I was planning on using a Celllog8s http://www.hobbyking.com/hobbyking/s...2_8S_Lipo.html to monitor the battery and a few Turnigy Watt meters http://www.hobbyking.com/hobbyking/s...dproduct=10080 to provide data on solar panel output (amps/volts), charge controller output (amps/volts) and one to act as battery out Amp meter. I have read that you cannot use battery voltage to measure SOC on a LYP battery and that you basically have to use an Amp counter to determine SOC
I want to experiment a little with LiFeYPo4 batteries for a solar off grid setup. Currently I use regular FLA batteries for a small back-up system, but I'm contemplating a much larger system for an off grid cabin and I want to do some research on LYP batteries because they seem like a much better option than FLA. If I can truly get 8000 Cycles at 50% DOD with a LYP battery, they would probably be cheaper in the long run then FLA
My plan is to get 4 100ah LiFeYPo4 batteries. The ones I’m looking at are these >http://www.alliancerenewableenergy.c...-LFP100AHA.htm
Next I plan on using a Morningstar TS-MPPT-60 charge controller with two 230 watt 24v panels. I don't expect much MPPT benefit other than the fact that the TS-MPPT-60 can be set to a custom charge setting and will down convert my panel's 24 volts to the battery bank's 12 volts, but what charge settings would I program into the TS-MPPT-60 for a LiFeYPo4 battery bank?
Next I have read that a BMS is not absolutely necessary if you Bottom Balance and only charge to 3.5 volts per cell, however none of the threads I have read actually cover how to bottom balance the battery bank. I assume I need a specific charger set up to charge one cell at a time (to a certain voltage?) and then a way to discharge each cell individually so that all the cells are at the same bottom voltage???? Any help on the proper way to bottom balance and what Items I will need to do it would be greatly appreciated.
Lastly I was planning on using a Celllog8s http://www.hobbyking.com/hobbyking/s...2_8S_Lipo.html to monitor the battery and a few Turnigy Watt meters http://www.hobbyking.com/hobbyking/s...dproduct=10080 to provide data on solar panel output (amps/volts), charge controller output (amps/volts) and one to act as battery out Amp meter. I have read that you cannot use battery voltage to measure SOC on a LYP battery and that you basically have to use an Amp counter to determine SOC
Comment