August 30, 20223 yr Me and another idiotic idea ... actually a friend is thinking at it... Today the energy prices fluctuate pretty much here in Europe during the day... so we were thinking to use this at our advantage WITHOUT using a Solar inverter. Looking for some device with BMS or some kind of control that can be used to charge batteries upon command. So we can see the price from 13 to 15 is lower than the price between 19 and 22 so we want to charge the batteries from 13-15 when electricity is cheap and discharge between 19-22 when electricity is expensive... Is there any device that can charge LiFePo batteries of 48-60V (which is not a solar inverter) up to 15-30kwh ?
August 30, 20223 yr Author Victron Multiplus seems to be able to do this Please delete my topic ... should have researched a bit more
August 31, 20223 yr 6 hours ago, Jaxone said: Victron Multiplus seems to be able to do this Please delete my topic ... should have researched a bit more Although you indicated to delete. Just tick the USE GRID for charging batteries on your Deye. Not sure if friend also has a Deye? No need to go the costly path of getting a Victron.
August 31, 20223 yr Author This is a totally different project He lives in the forest so no chance for solar panels for him.
September 1, 20223 yr On 2022/08/30 at 11:40 PM, Jaxone said: Is there any device that can charge LiFePo batteries of 48-60V (which is not a solar inverter) up to 15-30kwh ? Any off-grid inverter would do. Just disregard the MPPT and use it much as a UPS. You may need an external timer to switch its AC input on and off. I doubt that you will find a proper UPS of that power at lower price.
September 1, 20223 yr 11 minutes ago, Beat said: Any off-grid inverter would do. Just disregard the MPPT and use it much as a UPS. You may need an external timer to switch its AC input on and off. I doubt that you will find a proper UPS of that power at lower price. Also remember to switch the inverter off as well to preserve the power the off grid inverter will use while switched on. This can be 45-80W. Here a series resistor voltage divider to supply a timer with 12V if no 48V DC timer is readily available. Off grid AC chargers within an off grid inverter is really cheap vs buying just a powerful AC charger.
September 1, 20223 yr Author Yes, but not sure if the "cheap" off grid systems have the capability of charging with 150-250A from Grid. We study the market for possibilities now
September 1, 20223 yr 29 minutes ago, Jaxone said: Yes, but not sure if the "cheap" off grid systems have the capability of charging with 150-250A from Grid. We study the market for possibilities now Well you can charge 3kwh per hour. If you have 6 hrs of grid before you switch off you have the 15kwh on the lower side you are looking for. This is based on a 60A charging current. The Kodak OGS3.6KW can charge at 100A and the 5.6KW at 120A Edited September 1, 20223 yr by Scorp007
September 1, 20223 yr Author Problem is the prices changes hourly. So at 5PM price can be 1USD and at 6 it can be 6USD. Charging as much as possible in that ONE hour is essential.
September 1, 20223 yr 20 minutes ago, Jaxone said: Problem is the prices changes hourly. So at 5PM price can be 1USD and at 6 it can be 6USD. Charging as much as possible in that ONE hour is essential. OK. The Kodak has remote functionality via APP as far as I know but confirm so as long as you have 1 hour notice you can at 120A charge 6kwh. Edited September 1, 20223 yr by Scorp007
September 3, 20223 yr On 2022/09/01 at 2:25 PM, Jaxone said: Problem is the prices changes hourly. So at 5PM price can be 1USD and at 6 it can be 6USD. Charging as much as possible in that ONE hour is essential. Thanks for clarifying that the price does not jump from $1 to $6 but only to $1.5. It is quite a difference. 😎😎It is still quite expensive. Now I wonder is it not meant to be Danish Krone and not $. Edited September 3, 20223 yr by Scorp007
September 4, 20223 yr I use Eltek chargers (pretty cheap, very small, powerful and can be put in parallel) that I connect through a Teensy that translates the battery BMS messages and then this is controlled through Node Red via MQQT.
September 4, 20223 yr Author On 2022/09/03 at 12:48 PM, Scorp007 said: Thanks for clarifying that the price does not jump from $1 to $6 but only to $1.5. It is quite a difference. 😎😎It is still quite expensive. Now I wonder is it not meant to be Danish Krone and not $. Sorry my mistake , price can go from 0.3Eur to 1.5Eur ... so +1 eur jump.
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