mike_solar
New Member
- Joined
- Jan 26, 2022
- Messages
- 2
Hi All,
first of all what a great forum I have a great time of reading and watching also videos from Andy's off grid garage on how to.
I have received some quote's from commercial installers to place BYD LVL or LVS and I thought it was a bit to expensive since my house uses a lot of power.
Since I like to DIY and I rewired all the AC in my house when I bought it 2 years ago I thought let's do a DIY power wall how hard can it be right
House energy/electrical setup
My house is connected to the dutch grid and has 3 phases rated at 25A each (400V 3P+N) 17 kW power available with TN-S earth supply.
I'm all Electric so no natural gas. we have "normal" electric appliances like wasmachine/dryer/dishwasher/microwave/fridge freezer combo and all LED lights some networking gear and 2 computers.
for the "special" electric appliances we have.
- Air source heatpump boiler for hot water (0,7 kW +/- 3A on heat pump mode "Eco" mode or 3,2 kW in "turbo" mode with electric element enabled)
- Air source heatpump "multisplit AC" for heating and cooling in the main rooms averages 1,2 kW but can go to 3,6 kW (full 16A) on very cold or hot days.
- 2 IR heat panels 0,7 kW each for secondary rooms
- 11 kW induction stove with oven (3 phase device)
- 8 kW jacuzzi that can spike on jets and air blower start (20A 3 phase slow tripping C mcb). of which 3 kW is heating element.
No electric cars for the moment and not sure if we can find a home charger since we don't have a garage.
average yearly consumption is 14.400 kWh, lows in summer around 900 kWh/month and high in winter around 2000 kWh/month.
which low energy days in summer are around 32 kWh and high in winter 60-70 kWh a day.
this is a lot of energy but consider the house is over 100 years old and previous occupants used around 4000 m3 of gas for heating with old gas heaters AND had a fireplace they used almost daily in wintertime.
the total power of all our devices combined is a lot but on my energy measuring device I see total usage at the net meter of around 4000 watts and 7000 watts on average in a winter period. and no circuit breaker has ever tripped from overload. highest measured peak from usage over the last year is 14.000 watts (at a time we used the jacuzzi).
Solar
Of course we also have solar, consisting of 2x AC coupled SMA sunny tripower 8.0 on which 3 strings are connected on both inverters with a total of 34 panels are connected with 15.190 Wp orientation to the south -7 degrees and 35 degrees array and 2x 10 degrees.
yearly production is around 8.000 kWh for inverter 1 and 4.200 kWh for inverter 2 combined: 12.200 kWh
I've seen peaks of exporting around 13.000 watts on moments of very low self consumption and optimal production.
so probably I'll fit another 3 panels in the 35 degrees string in the ground mounted garden string.
Battery
after watching some video's from Andy's off grid garage, I ordered 64 prismatic EVE 280 Ah batteries.
Which I would like to connect in 4 parallel strings of 1P16S so every cell is monitored.
the batteries should arrive from China around mid April.
all cost included shipping/customs/vat e.t.c. I averaged around $119/kWh which I think is as close to $100/kWh as it will be for a while.
Goal
- my goal is to be self sufficient "off grid" as often as possible. According to my calculations this should work for like march till somewhere in oktober.
- in wintertime when power is more mission critical because of early darkness and heat depending on electric I would like to have a % of battery capacity for power outages. and still charge the battery a bit with the surplus solar we have at some moments in the day.
- in the near future I also consider changing my contract to flex rate so I can charge the batteries (in wintertime) when power is cheapest.
- whole home backup so the wiring would be
Main grid point -----> 3x C25 mob ---> 17M YMVK 4x6mm2-AS ground cable --> subpanel in workshop behind the house with 2x solar inverters (batterie's would fit here) --> 22M YVM 4x10mm2-AS ground cable back to house --> subpanel with all the circuit breakers for the house).
Wishes
- I'm thinking of 3x SMA Sunny Islands 8.0H-13 because it would exactly fit my needs for power. and It matches my solar inverters which I'm happy about.
- I see also a lot of Victron, that could also be an option although more expensive (multiplus II or Quattro II).
- BMS needs to work with SMA SI, currently thinking of REC but any recommendations welcome.
- Safety over cost saving.
All feedback is welcome, and thank you all in advance for your advice.
Cheers
Mike
first of all what a great forum I have a great time of reading and watching also videos from Andy's off grid garage on how to.
I have received some quote's from commercial installers to place BYD LVL or LVS and I thought it was a bit to expensive since my house uses a lot of power.
Since I like to DIY and I rewired all the AC in my house when I bought it 2 years ago I thought let's do a DIY power wall how hard can it be right
House energy/electrical setup
My house is connected to the dutch grid and has 3 phases rated at 25A each (400V 3P+N) 17 kW power available with TN-S earth supply.
I'm all Electric so no natural gas. we have "normal" electric appliances like wasmachine/dryer/dishwasher/microwave/fridge freezer combo and all LED lights some networking gear and 2 computers.
for the "special" electric appliances we have.
- Air source heatpump boiler for hot water (0,7 kW +/- 3A on heat pump mode "Eco" mode or 3,2 kW in "turbo" mode with electric element enabled)
- Air source heatpump "multisplit AC" for heating and cooling in the main rooms averages 1,2 kW but can go to 3,6 kW (full 16A) on very cold or hot days.
- 2 IR heat panels 0,7 kW each for secondary rooms
- 11 kW induction stove with oven (3 phase device)
- 8 kW jacuzzi that can spike on jets and air blower start (20A 3 phase slow tripping C mcb). of which 3 kW is heating element.
No electric cars for the moment and not sure if we can find a home charger since we don't have a garage.
average yearly consumption is 14.400 kWh, lows in summer around 900 kWh/month and high in winter around 2000 kWh/month.
which low energy days in summer are around 32 kWh and high in winter 60-70 kWh a day.
this is a lot of energy but consider the house is over 100 years old and previous occupants used around 4000 m3 of gas for heating with old gas heaters AND had a fireplace they used almost daily in wintertime.
the total power of all our devices combined is a lot but on my energy measuring device I see total usage at the net meter of around 4000 watts and 7000 watts on average in a winter period. and no circuit breaker has ever tripped from overload. highest measured peak from usage over the last year is 14.000 watts (at a time we used the jacuzzi).
Solar
Of course we also have solar, consisting of 2x AC coupled SMA sunny tripower 8.0 on which 3 strings are connected on both inverters with a total of 34 panels are connected with 15.190 Wp orientation to the south -7 degrees and 35 degrees array and 2x 10 degrees.
yearly production is around 8.000 kWh for inverter 1 and 4.200 kWh for inverter 2 combined: 12.200 kWh
I've seen peaks of exporting around 13.000 watts on moments of very low self consumption and optimal production.
so probably I'll fit another 3 panels in the 35 degrees string in the ground mounted garden string.
Battery
after watching some video's from Andy's off grid garage, I ordered 64 prismatic EVE 280 Ah batteries.
Which I would like to connect in 4 parallel strings of 1P16S so every cell is monitored.
the batteries should arrive from China around mid April.
all cost included shipping/customs/vat e.t.c. I averaged around $119/kWh which I think is as close to $100/kWh as it will be for a while.
Goal
- my goal is to be self sufficient "off grid" as often as possible. According to my calculations this should work for like march till somewhere in oktober.
- in wintertime when power is more mission critical because of early darkness and heat depending on electric I would like to have a % of battery capacity for power outages. and still charge the battery a bit with the surplus solar we have at some moments in the day.
- in the near future I also consider changing my contract to flex rate so I can charge the batteries (in wintertime) when power is cheapest.
- whole home backup so the wiring would be
Main grid point -----> 3x C25 mob ---> 17M YMVK 4x6mm2-AS ground cable --> subpanel in workshop behind the house with 2x solar inverters (batterie's would fit here) --> 22M YVM 4x10mm2-AS ground cable back to house --> subpanel with all the circuit breakers for the house).
Wishes
- I'm thinking of 3x SMA Sunny Islands 8.0H-13 because it would exactly fit my needs for power. and It matches my solar inverters which I'm happy about.
- I see also a lot of Victron, that could also be an option although more expensive (multiplus II or Quattro II).
- BMS needs to work with SMA SI, currently thinking of REC but any recommendations welcome.
- Safety over cost saving.
All feedback is welcome, and thank you all in advance for your advice.
Cheers
Mike