New - Bottom Balancer Rental : 19.90€ / week - Why buy and own one when you need it only once ?

After building my DIY ESS, I realized that my DIY Bottom Balancer was not being used anymore; Of course, Bottom Balancing of individual LiFePO4 cells has to be performed only once before connecting the cells into the desired voltage string for use - before the first charge actually -

Same thing, if you want to build an ESS, convert your Vectrix from NiMH to LiFePO4 - many do that themselves -, or any other LiFePO4 based project, you will need to go through this step - see why below -





You will do the Bottom Balancing of all your cells and then, never gain ... So why buy and own an expensive piece of equipment for nothing ?

That is why I decided to provide a new service: The Bottom Balancer Rental, for 19.90€ / week, excluding shipping period, so you have a full week of use of it, plenty of time to empty your cells, then return the device to me


Why is Bottom Balancing mandatory ?

Read : LiFePO4 Battery Charging Method - Don't Ruin your Expensive Cells !


Bottom Balancing the DIY ESS CALB CA180FI Cells

Bottom Balancer video



Does it work ?

Yes, I have used this device on 3 different LiFePO4 Battery packs, with 2 different cells brands



How do I use it ?

I will provide a PDF documentation by email to the persons renting it



Interested ?

Start renting my Bottom Balancer Now:

Options

1 Week - €19,90 EUR 2 Weeks (20% off) - €31,90 EUR 3 Weeks (30% off) - €41,90 EUR

NB: Shipping costs not included

NB: To prevent problems, I will charge an extra 100 EUR as a security deposit, refunded when the Bottom Balancer comes back to me

DIY ESS - Watching the End of Charge Remotely with Karotz

After charging last night for several hours during off-peak hours, this morning I turned on the ESS and it went to GTI Mode during shower and breakfast

When I left home for work, and switched it to Forced Charge Mode and placed Karotz - rabbit webcam - in front of the voltmeter

The battery pack voltage climbed nicely all morning ...



until it reached the programmed charge voltage limit of 28V (3.5V per cell times 8 cells), as you can see the upper left red is ON, meaning the voltmeter relay opened and the Charge Contactor opened as well, and all the chargers stop

As a result, the pack voltage drops slowly to 26.6V (3.32V per cell times 8 cells), which is normal ...

After and hour or so, I still have the same pack voltage of 26.6V and it does not seem to move anymore at this point

Tonight, full discharge of the ESS battery pack in GTI Mode - Normal Automatic Mode -

LiFePO4 Cells & Charger for Sale

Here are some left over items from my Enginer Prius PHEV Kit that I have for sale online at the moment (on the famous French website called leboncoin.fr)

3 LiFePO4 Mottcell cells : Direct Link




A brand new LiFePO4 Smart Charger I had for spare : Direct Link

LiFePO4 Energy Storage System - End of Charge

In this video I caught the end of the battery bank charge
You can see that individual cell voltages are not going to high even if I am not using a BMS ...
The charger is in its constant voltage phase and you can see the current going into the batteries is going down, so is the charger consumption

It is also the last time I charge my system with a 48V charger because I am going to switch to a 24V configuration ...