Renogy 200ah BT new battery won't charge! BMS fault? or Part missing?
- Thread starter obd.tech
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Alexank
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@obd.tech @mayuan
Very interesting info thanks my 200AH battery has twice during a recent cold spell (-9C) dropped to an output of 12.2v for a few hours but immediately returned to 13.2v if any load like lights were switched on, however the wretched DC home app (when it decides to connect) reports a BMS voltage of 13.2V
If it becomes a permanent problem I will take the lid off and investigate.
I am also curious who makes the BMS simply because the info provided by the wretched DC home app is very limited and I find it terribly inaccurate re the SOC and I am very suspicious about the accuracy of the reported internal temperature.
When charging mine typically gets to a stated 99.1% charged and then accepts another 50-60A before going to 100% so I find the SOC info totally unreliable!
I was rather hoping I could replace the, I assume, propriety Renogy BT interface with something superior that uses a Generic app?
Is the BT interface separate from the BMS?
Thanks
Very interesting info thanks my 200AH battery has twice during a recent cold spell (-9C) dropped to an output of 12.2v for a few hours but immediately returned to 13.2v if any load like lights were switched on, however the wretched DC home app (when it decides to connect) reports a BMS voltage of 13.2V
If it becomes a permanent problem I will take the lid off and investigate.
I am also curious who makes the BMS simply because the info provided by the wretched DC home app is very limited and I find it terribly inaccurate re the SOC and I am very suspicious about the accuracy of the reported internal temperature.
When charging mine typically gets to a stated 99.1% charged and then accepts another 50-60A before going to 100% so I find the SOC info totally unreliable!
I was rather hoping I could replace the, I assume, propriety Renogy BT interface with something superior that uses a Generic app?
Is the BT interface separate from the BMS?
Thanks
Alexank
New Member
- Joined
- Dec 5, 2019
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- 31
PS
during our cold spell I stood mine on a simple propagator heating mat in the van and without any additional insulation the battery was up to +12C after a few hours, one of these:
during our cold spell I stood mine on a simple propagator heating mat in the van and without any additional insulation the battery was up to +12C after a few hours, one of these:
I didn't find out the BMS supplier Keith, but if u look at my first photo it shows a small heat shrinked BT interface under the false lid skin.
Tbh your better off using your Ali battery monitor..... More accurate & quicker than any App BMS malarkey M8.
Maybe your 12.2v reading was the shelf mode cutting in?
Regards Mark ;-) (Sbgt)
Tbh your better off using your Ali battery monitor..... More accurate & quicker than any App BMS malarkey M8.
Maybe your 12.2v reading was the shelf mode cutting in?
Regards Mark ;-) (Sbgt)
I used a hammer and a big flat-head screwdriver, the glue was very hard and shattered when you pried it open. Made a lot of noise opening it. I wasn't able to fine any information on the BMS, the unit doesn't have anything other then what is shown in the pictures.
Alexank
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I suspect the BT interface is RS232 so probably uses modbus.
If I ever dismantle mine I will try a generic modbus adapter and see what info the BMS provides.
Renogy are not manglefacturers so bound to have bought in a fairly generic BMS, same as they do for their solar controllers and BT interfaces that are made by SRNE in fact SRNE also do an App but I am pretty sure it only does the same things as the Renogy BT one
If I ever dismantle mine I will try a generic modbus adapter and see what info the BMS provides.
Renogy are not manglefacturers so bound to have bought in a fairly generic BMS, same as they do for their solar controllers and BT interfaces that are made by SRNE in fact SRNE also do an App but I am pretty sure it only does the same things as the Renogy BT one
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