SBMS120 & SBMS40 - will be exactly the same as current version delivered to the backers of the last Kickstarter and described in the user manual linked below.
SBMS0 - will be a new low cost variant based on multiple requests and have the same 2.4" LCD as the SBMS40 compatible firmware with all the futures, just missing the power electronics (built in current shunt, ideal diode, power mosfets and WiFi module) but have all other functions like full BMS functionality including cell balancing and the battery current will be measured with an external current shut of up to 500A same as the other SBMS models and have the same EXT IO3 and EXT IO4 for remote ON/OFF an inverter and or a charger (also known as Under voltage and Over Voltage disconnect signals). So SBMS0 can be used for example with the Victron Multiplus inverter/charger as they support separate remote ON/OFF for inverter and charger. External DC SSR (Solid State Relay) can be used to add PV panel charging capability to the SBMS0 getting the same functionality as the SBMS40, SBMS120 or even more up to 500A thus being very flexible and cost effective. An ESP32 WiFi module can also be added externally to the SBMS0 as the firmware will automatically support that, same as on the SBMS40 and SBMS120 that have the ESP32 built in. But data can also be accessed over serial port (UART) if you want to interface with something like a Rasppbery Pi or any other computing device.
DMPPT450 - Digital MPPT Thermal Controller is a unique device like nothing else on the market so make sure you read the manual and understand what it is. While the MPPT may sound familiar the Digital in front is an important hint that this is not based on unreliable and expensive DC-DC converters and it achieves MPPT for heating applications (cooling may also be possible) by switching ON or OFF a number of up to 6 elements so that PV array is loaded optimally to achieve max power point. The DMPPT450 will first divert 1 up to 6 of the PV sub arrays to SBMS for battery charging keeping the charge limit to what the user sets in the SBMS menu so charging is done at adequate rate for the battery and all the energy not needed for battery charging is diverted to heating. For all the details please check the DMPPT450 user manual linked below.
The above two devices plus a 10kW PV array plus a 5kWh LiFePO4 and a 150kWh thermal storage power my small 65m² (~700sqft) house fully, meaning all heat and electricity, making this a so called net zero energy house.
Not only that, but heating with PV solar is the most cost effective solution even when compared to natural gas.
For the cost amortization comparison see page 5 in the presentation I made before last Kickstarter.
If you need a custom pledge level with any other combination than already listed please let me know as I can add that for you.
Risks and challenges
This will be my fourth successful Kickstarter project so I do not expect any major risks. DMPPT450, SBMS120 and SBMS40 are already designed and the SBMS0 is the only one that needs to be designed but since is a cut down version of the existing SBMS40 I do not expect much work to be needed.Learn about accountability on Kickstarter
- (60 days)