Recent content by william2021

Hi, thanks so much for your prompt help - and they are spot on! I measured voltage with multimeter before, so thought that's unnecessary to do that again. But I followed your advice anyway - and I'm happy I did! The reading of that last cell sometimes is of the same reading just like other...

Hi, I bought the following: 4 x 230AH cells from Docan VNSZNR BMS LiFePO4 4S 12V 150A from Amazon GoWISE Power 1500W Pure Sine Wave Power Inverter from Amazon Renogy MPPT charger from Amazon They essentially works, except sometimes when using 1100W rice cooker the system would stop working...

Just a second thought, if the BMS disconnects the battery from the charger, wouldn't the charger burn out from the panel? I remember Will's video said I should always connect the battery to the charger before connecting the panel.

Ok, thanks for the explanation of protecting charging with BMS. So I will buy a separate port and connect the BMS to both the charger and the inverter to the corresponding ports.

Thanks. I currently have 4 100W panels in serial, may add another 4 in serial, and then parallel the two serials, so my charge current will be within 20A if I'm not wrong. The battery bank is 12V, will be a 280Ah one for now. My load can be 1500W occassionally in the evenings or while the sun...

To add to my post above, here is the specification of the Daly BMS: https://ae01.alicdn.com/kf/Hed02da12b1bc4f139a07cb9e07309ed28.jpg linked from the Daly page above. It says for separate port, the charge current is 10A for up to 60A models, and 40A for models from 80A.

Hi, sorry for cutting in but I'm trying to understand this issue such as Will's post at https://diysolarforum.com/threads/bms-common-port-vs-seperate-port.468/#post-4145 . If I understand correctly, he said for separate port, Daly's BMS has charge current at 10A. While this Daly's product...

Hi, I use a battery monitor to alarm if the 12V battery drops below 12.2. However, due to Peukert's Law, the following would happen for a 200Ah 12V liquid acid battery: 1. the voltage is say 12.8V 2. a heavy load is applied such as 600W 3. voltage will quickly drop to say 11.9V 4. it will...

Thanks! I will change to one of them.

Thanks so much, this helped me understand better how the 3-stage worked. Will the following charge controllers good for avoiding this problem and getting maximum charge to liquid acid batteries? https://www.amazon.com/Controller-Negative-Grounding-Suitable-Monitoring/dp/B07KB4G4WD/...

Yes, it's flooded, and the link I bought is https://www.amazon.com/SUNNYSKY-Solar-Charge-Controller-12V24V48V/dp/B073P72XGC/. I thought it's better than yellow one you linked above, but looks like they are the same :-(

My current charger allows to set, in addition to the battery type etc, the following (with the default): floating charge: 13.8V equilization charge: 14.5V maximum current: 60A Is there anything I can change so it charges more efficiently? I don't mind occasionally change setting when season...

Sorry, that's the term used by the Renogy chargers so it does Equalization every 28 days. See https://images-na.ssl-images-amazon.com/images/I/A1Llr4S6jjL.pdf Please ignore this then, I changed the title to about 3-stage, since my current charger appears to not having 3-stage.

Hi, I'm still learning while trying and just got a question. I have two Duracell 6-volt 1kWh golf car batteries in serial and 4 100W panels in serial. Currently I bought a Sunnysky 60A MPPT charge controller. I just learned that it's not a 4-stage charger. Is it worthwhile changing to a...