Bluesea has some latching relays upwards of 500 amps at 12 and 24 volts... May be expensive in the ~$250 USD range. These are designed to connect battery banks when charging--May need "hacking" for the disconnect function/control.
Looking at ivor's earlier post it sounded like he was getting a battery bank for $2k (24V 400Ah as I recall) and that's a lot cheaper than it would cost thru ECP from what I could tell. That may apply to other components too. For some reason, I am nervous about ordering from Ali. For one thing, if there is a warranty issue, would you try to handle through them or the manufacturer? I suppose if you save enough on hte order, you could apply the savings to new components if that was easier than trying to get warranty coverage.
12 * 300 W (10 fixed rooftop, 2 movable pole mount), Morningstar Tristar MPPT 60, Magnum 4448 PAE, 64 200Ah CALB in 4p16s arrangement with 16 LED Balancers and a Choice BMS300 (It is lousy and I don't recommend but it provides high and low voltage cutoff)
The batteries arrived today, a week from order date, not bad. @Dave said. For some reason, I am nervous about ordering from Ali. For one thing, if there is a warranty issue, would you try to handle through them or the manufacturer? I suppose if you save enough on hte order, you could apply the savings to new components if that was easier than trying to get warranty coverage At first i was a little apprehensive about Alibaba, perhaps the Ali Baba thieves association , but in reality they act as a go between offering protection to the buyer by holding funds from the seller until the transaction is complete and the customer is satisfied. When I imported cars from Japan to Canada I used a similar trade assurance company in Japan, as protection from shady operators. All my dealings so far with Alibaba have been positive.
1500W, 6× Schutten 250W Poly panels , Schneider MPPT 60 150 CC, Schneider SW 2524 inverter, 400Ah LFP 24V nominal battery bank Second system 1890W 3 × 300W No name brand poly, 3×330 Sunsolar Poly panels, Morningstar TS 60 PWM controller, no name 2000W inverter 400Ah FLA 24V nominal used for water pumping and day time air conditioning. 5Kw Yanmar clone single cylinder air cooled diesel generator for rare emergency charging and welding.
Looking at ivor's earlier post it sounded like he was getting a battery bank for $2k (24V 400Ah as I recall) and that's a lot cheaper than it would cost thru ECP from what I could tell. That may apply to other components too. For some reason, I am nervous about ordering from Ali. For one thing, if there is a warranty issue, would you try to handle through them or the manufacturer? I suppose if you save enough on hte order, you could apply the savings to new components if that was easier than trying to get warranty coverage.
If the cells are all reasonably balanced to start with the high rate 6A balancers will be unnecessary. From the pictures the 48V-100A-EV-BMS-Battery-Management-System looks like it has a balancing function but the balance current would probably be around 70mA as well. Doesn't look like you can connect it to the outside world and it doesn't have a display.
One function that a BMS should provide which is extremely useful is the SOC of the battery (battery fuel gauge).
As for ordering from Ali I have ordered many different things from different suppliers and have never had any problems. I think Ali will help you if the goods don't arrive, are DOA or not as advertised but you are probably on your own if things go pear shaped a few months down the track. I always do an Internet search on the supplier and the product to see how much feedback there has been. For Lithium batteries and BMSes I suggest you have a look at the Endless Spheres Forum
Simon
Off-Grid with LFP (LiFePO4) battery, battery Installed April 2013 32x90Ah Winston cells 2p16s (48V), MPP Solar PIP5048MS 5kW Inverter/80A MPPT controller/60A charger, 1900W of Solar Panels modified BMS based on TI bq769x0 cell monitors. Homemade overall system monitoring and power management https://github.com/simat/BatteryMonitor
Comments
https://www.bluesea.com/products/category/35/Automatic_Charging_Relays
250 Amp latching solenoid:
https://www.bluesea.com/products/9012/L_Solenoid_-_12_24V_DC_250A
-Bill
http://members.sti.net/offgridsolar/
E-mail [email protected]
@Dave said. For some reason, I am nervous about ordering from Ali. For one thing, if there is a warranty issue, would you try to handle through them or the manufacturer? I suppose if you save enough on hte order, you could apply the savings to new components if that was easier than trying to get warranty coverage
At first i was a little apprehensive about Alibaba, perhaps the Ali Baba thieves association
Second system 1890W 3 × 300W No name brand poly, 3×330 Sunsolar Poly panels, Morningstar TS 60 PWM controller, no name 2000W inverter 400Ah FLA 24V nominal used for water pumping and day time air conditioning.
5Kw Yanmar clone single cylinder air cooled diesel generator for rare emergency charging and welding.
32x90Ah Winston cells 2p16s (48V), MPP Solar PIP5048MS 5kW Inverter/80A MPPT controller/60A charger, 1900W of Solar Panels
modified BMS based on TI bq769x0 cell monitors.
Homemade overall system monitoring and power management https://github.com/simat/BatteryMonitor