BaronVonChickenPants
Member
- Joined
- Dec 5, 2017
- Messages
- 59
So after much time spent going down the HV battery packrabbit hole I have declared it too hard.
Our 48v prototype system with APC 3000VA UPS and 14kwh of VRLA works well and has components such as inverters, chargers, BMS, etcreadily available.
So we have taken a detour and are now building a 48v LTO battery pack out of 160 cells from OSN power in china. We purchased 215 cells so we have some to spare for other 12 and 48v projects.
We are building parallel packs of 8 cells to create 2.5v 240AH batteries, we will then connect 20 of these in series to get 48v, ~12kWh. The charge, float and operational voltages match very well with standard Gel cell lead acid settings common to most chargers and inverters.
I am still negotiating with suppliers but I am looking at getting a 12kwlow frequency solar inverter like this:
http://www.sacolar.com/products/info_8_itemid_18.html
https://www.must-solar.com/pv3500-4-12k-series-low-frequency-solar-inverter/
https://www.yiyen.com/product/hp-pure-sine-wave-invertercharger/
I am aware that low frequency inverters are not quite as efficient as the high frequency inverters like the PIP4048/etc but as the site is off grid we need an inverter that will tolerategenerator power without issue and I like the buffer the transformer offers for surge loads.
Our prototype system has 8kw of solar panels and the full scale system will have 16kw, this is for a family home + granny float with 3 adults and 3 children.
Regards,
Jordan
Our 48v prototype system with APC 3000VA UPS and 14kwh of VRLA works well and has components such as inverters, chargers, BMS, etcreadily available.
So we have taken a detour and are now building a 48v LTO battery pack out of 160 cells from OSN power in china. We purchased 215 cells so we have some to spare for other 12 and 48v projects.
We are building parallel packs of 8 cells to create 2.5v 240AH batteries, we will then connect 20 of these in series to get 48v, ~12kWh. The charge, float and operational voltages match very well with standard Gel cell lead acid settings common to most chargers and inverters.
I am still negotiating with suppliers but I am looking at getting a 12kwlow frequency solar inverter like this:
http://www.sacolar.com/products/info_8_itemid_18.html
https://www.must-solar.com/pv3500-4-12k-series-low-frequency-solar-inverter/
https://www.yiyen.com/product/hp-pure-sine-wave-invertercharger/
I am aware that low frequency inverters are not quite as efficient as the high frequency inverters like the PIP4048/etc but as the site is off grid we need an inverter that will tolerategenerator power without issue and I like the buffer the transformer offers for surge loads.
Our prototype system has 8kw of solar panels and the full scale system will have 16kw, this is for a family home + granny float with 3 adults and 3 children.
Regards,
Jordan