Hi all !
Finally i have my complete diagram. I think I bought the SBMS0 over a year ago…. time flies.
The main objective with this system is to heat 3x100L isolated water tanks and use this water to heat my workshop floor.
And to make use of my panels in the summer I thought I add some batteries to make thing interesting and power some stuff (the office part of my workshop).
The heart of the system will be the SBMS0. And the link to the mortal world would be a Multiplus II 24/3000VA. It’s connected to the grid and thanks to the Virtual Switch it is told to ignore the AC in from the grid as long as :
- the power need are under 2,5KW
- (or) the battery pack is above a certain tension level
I’ll try to be very conservative for the battery settings as I hope this system would last long enough to be profitable. As I’m grid connected (0,165€/kWh), if I’m honest, running on batteries can be a waist of money as I calculated that I need it running as it is for at least 12 years to recover my costs. And that’s without factoring in the cost of the solar panels… But I’m already off topic.
Please review my diagram (inspired from Niels. Thanks Niels !).
The solar panels are SoliTek Standard M.60-B-330 full black monocrystalline 60 cell module
The battery is a 8SP1 3.2v 310Ah Lifepo4
Here are the part I do not have yet (and I need your input on this) :
- 32A DC Breaker (x12) : TMC 71C 32A
- Battery and PV Shunt : Rideon MKB-300 50mV
- 200A T Fuse : JLLN200.X 125VDC
- 50A Fuse : EATON NON-50
Please feel free to comment on my choices before I hit the buy button.
Bonus questions :
1 - When running on battery, i would be "off grid" for L and N but still tied to the PE of the grid. Is that in some way a security hazard ? I am using differential (30mA) breaker on my "off grid" breaker panel, so I think this would be OK, but I’m still asking.
2 - the Multiplus and the Virtual Switch will be switching the AC in ON i case of a battery voltage below a certain level stopping the drain (it will not be a SBMSO decision…). As I want the grid to kick in seamlessly, I thought the was the best / simplest solution. Correct ?
3 - the Victron BP100 : "Ext IO 3-" goes to "REMOTE +", is that correct ?
Have a great day !