Panhandlesolar
New Member
- Joined
- Sep 12, 2020
- Messages
- 5
So I started a this DIY Grid connected project close to a year ago. Bought a 20KW DIY kit from BluesunPV in China off alibaba....Awesome deal.....
The kit included 48 400Watt panels, 2 GROWATT 10KW MPPT Inverters, all combiners, racking system, cables.....the panels will be arranged in 6 strings 8 panels each, 300V into each MPPT input.
It took awhile to get the the panels here and have for my new muti-purpose building to get built and the construction approval process, building was completed in May and received my approval to install my panel system, then I realized, I really wanted to be independent and off grid, so I put a hold on the installation process until I work out batteries and the componentry to support it. AS a side I am getting into indoor farming using vertical principles, and the multipurpose building will need more electricity for more hours of the day.
I want my house to powered by the batteries, using the Panels to charge the batteries, and in the true emergency we have a 38KW Natural Gas Generator home backup system connected to a huge 400AMP Transfer switch, yes my house has a 400AMP service, but only a 200 AMP Main Panel
Two major concerns, I do not want to perturbate the current PV install approval that is in place with the county. As it can take a while for a change. SO I will complete the install process as approved, grid tied 20KW.
I am trying to design the battery system now, I keep running the math via a few online calculators. Based on a high average of current energy usage, in the middle of the summer here in North Florida we use over 1900KWh per month, yet contrast that to 1000KWH in the full winter months. I don't mind over building to produce more. I settled on 2000KWH for my math, 2000/30 = 67KWH per day. I want to build a battery system to support at least 3 days of full battery operation and then when the batteries hit there recharge threshold the Backup Generator can cycle on and charge them until float.
As you know there is a ton of data on LiFePO batteries, I would like to build a large battery bank using the EVE 280AH 3.6V batteries as they are readily available and I have plenty of Environmental controlled space to place the bank and keep it close to the inverters and main panels. based on my fuzzy math 67kWh daily =1396Ahr requirements, so I assume I will need 5 EVE 280AHr batteries to achieve the 1396AHr, so 14S String or 3 Strings to get up to three days of Electricity. Is that right?
The more crucial question......do I need to buy new Inverters to support this plan, I got the GROWATTs very inexpensively however, there are strictly grid tie. Need to figure out to convert to Off Grid.
Any additional questions I should be concerned with.
Thank you in advance,
Jim
The kit included 48 400Watt panels, 2 GROWATT 10KW MPPT Inverters, all combiners, racking system, cables.....the panels will be arranged in 6 strings 8 panels each, 300V into each MPPT input.
It took awhile to get the the panels here and have for my new muti-purpose building to get built and the construction approval process, building was completed in May and received my approval to install my panel system, then I realized, I really wanted to be independent and off grid, so I put a hold on the installation process until I work out batteries and the componentry to support it. AS a side I am getting into indoor farming using vertical principles, and the multipurpose building will need more electricity for more hours of the day.
I want my house to powered by the batteries, using the Panels to charge the batteries, and in the true emergency we have a 38KW Natural Gas Generator home backup system connected to a huge 400AMP Transfer switch, yes my house has a 400AMP service, but only a 200 AMP Main Panel
Two major concerns, I do not want to perturbate the current PV install approval that is in place with the county. As it can take a while for a change. SO I will complete the install process as approved, grid tied 20KW.
I am trying to design the battery system now, I keep running the math via a few online calculators. Based on a high average of current energy usage, in the middle of the summer here in North Florida we use over 1900KWh per month, yet contrast that to 1000KWH in the full winter months. I don't mind over building to produce more. I settled on 2000KWH for my math, 2000/30 = 67KWH per day. I want to build a battery system to support at least 3 days of full battery operation and then when the batteries hit there recharge threshold the Backup Generator can cycle on and charge them until float.
As you know there is a ton of data on LiFePO batteries, I would like to build a large battery bank using the EVE 280AH 3.6V batteries as they are readily available and I have plenty of Environmental controlled space to place the bank and keep it close to the inverters and main panels. based on my fuzzy math 67kWh daily =1396Ahr requirements, so I assume I will need 5 EVE 280AHr batteries to achieve the 1396AHr, so 14S String or 3 Strings to get up to three days of Electricity. Is that right?
The more crucial question......do I need to buy new Inverters to support this plan, I got the GROWATTs very inexpensively however, there are strictly grid tie. Need to figure out to convert to Off Grid.
Any additional questions I should be concerned with.
Thank you in advance,
Jim