January 10, 20251 yr Got tired of replacing Sealed Lead Acid batteries Decided to try Li-Fe on the trolley inverter with no lithium charging option. The REVOV 12v battery is supposedly a drop in replacement for lead acidand has a built in BMS you can monitor via bluetooth So far so good!  Wish me, and the poor BMS luck🫣    Edited January 10, 20251 yr by BigotedUncle No text
January 11, 20251 yr Howdy I notice you have some V.S.O.P lubricating liquid to cool the bms, that should do it.😇
January 13, 20251 yr Author On 2025/01/11 at 4:32 PM, vrystaat said: Howdy I notice you have some V.S.O.P lubricating liquid to cool the bms, that should do it.😇 🤣🤣🤣
January 13, 20251 yr Author On 2025/01/10 at 8:26 PM, BigotedUncle said: Got tired of replacing Sealed Lead Acid batteries Decided to try Li-Fe on the trolley inverter with no lithium charging option. The REVOV 12v battery is supposedly a drop in replacement for lead acidand has a built in BMS you can monitor via bluetooth So far so good!  Wish me, and the poor BMS luck🫣    Update: all works fine. The BMS's have have registered their first full cycle with me. They came with 1 from factory. I've suspect their quality checking. But they've never hit zero %, so I suspect the BMS counts a cycle each time the batteries produce 100Ah or 100% of their capacity? E.g. the 2x50% discharges I've done now = 1 cycle? Â
January 13, 20251 yr 9 hours ago, BigotedUncle said: E.g. the 2x50% discharges I've done now = 1 cycle? @BigotedUncle, Yes, I think that's about right, at least that is my understanding. - from my BLS Batteries point of view...They have Pace BMS. But a lot of white labelled Batteries use this/other BMS brands, and the firmware may differ in how it calculates Cycles. Some sees a small +- 10% SOC drop as a cycle, and clock up cycles very fast (>1 per day), specially if your system charges and discharges frequently during the day. After 4 years, my cycle count is 622, which equates to more or less 50% discharge daily - which is what I'm doing. I expect that to increase slightly, as I am now driving my batteries a bit lower SOC daily.
January 13, 20251 yr @BigotedUncle, Drop in replacement it may be, but hopefully the Salesman advised you to change the inverter setting for this new battery. It is completely different to SLA, so please tell us you did change the Charging Voltage and Current as per battery manufacturer. Else you inadvertently may Over/Undercharge the batteries, and not gain the advantages that you thought you had, especially long term.
January 14, 20251 yr Author 17 hours ago, Sidewinder said: @BigotedUncle, Drop in replacement it may be, but hopefully the Salesman advised you to change the inverter setting for this new battery. It is completely different to SLA, so please tell us you did change the Charging Voltage and Current as per battery manufacturer. Else you inadvertently may Over/Undercharge the batteries, and not gain the advantages that you thought you had, especially long term. I wish I could tell you what you want to hear, but I'd be lying🥲 Yes, both the battery manufacturer and the sales persons make a huge effort to warn you about the settings, but the inverter does not have a lithium option. The only settings i can change, that is relevant, is charge voltage, but that maxes out at 27.6 or 13.8V per battery. YET, so far, it seems to charge according to the batterys needs. Even hitting the 14.1v after loadshedding/load reduction, which is strange or, more likely, i don't understand my own setup.    Edited January 14, 20251 yr by BigotedUncle Clarification
January 14, 20251 yr @BigotedUncle, Great, seems you got it right...BUT.... Monitoring overall battery voltage is not a 100% method of determining COV (Cell Over Voltage). Your battery Voltage may be say 14.2V max (add may I add again Voltronics based inverters tendency to overshoot) will give you ave 3.55V per cell. Still safe. However, what you don't know is what each cell is doing in the battery pack. e.g. instead of 3.55+3.55+3.55+3.55 = 14.2V, you could be unknowingly sitting with: 3.55+3.44+3.55+3.66 = 14.2V. So overall all looks OK, but cell no.2 is undercharged, and cell no.4 is overvoltage. Hope you can find a better monitoring tool for this battery. Unfortunately, many such Apps don't do this, and one wonders what went wrong. Typically, Manufacturers have proprietary software to show UV/OV, and 3rd party solutions sometimes is possible, depending on how available the battery info is, and some very clever people to decipher all of this info! Any that's why it is relatively easy for them to proof OV condition at the cell level, even if your monitoring system shows everything is within limits. Good luck. Hope your new battery will not fail you soon!
January 17, 20251 yr Author On 2025/01/14 at 1:44 PM, Sidewinder said: @BigotedUncle, Great, seems you got it right...BUT.... Monitoring overall battery voltage is not a 100% method of determining COV (Cell Over Voltage). Your battery Voltage may be say 14.2V max (add may I add again Voltronics based inverters tendency to overshoot) will give you ave 3.55V per cell. Still safe. However, what you don't know is what each cell is doing in the battery pack. e.g. instead of 3.55+3.55+3.55+3.55 = 14.2V, you could be unknowingly sitting with: 3.55+3.44+3.55+3.66 = 14.2V. So overall all looks OK, but cell no.2 is undercharged, and cell no.4 is overvoltage. Hope you can find a better monitoring tool for this battery. Unfortunately, many such Apps don't do this, and one wonders what went wrong. Typically, Manufacturers have proprietary software to show UV/OV, and 3rd party solutions sometimes is possible, depending on how available the battery info is, and some very clever people to decipher all of this info! Any that's why it is relatively easy for them to proof OV condition at the cell level, even if your monitoring system shows everything is within limits. Good luck. Hope your new battery will not fail you soon! Thanks for the best wishes. I guess I'm not doing it. The poor BMS is. 😅 P.s. Incase you're curious, this is a snap shot of how the REVOV batteries maintain the 13.7 float voltage of the battery manufacturer. I'll keep watching them!  Â
January 18, 20251 yr 10 hours ago, BigotedUncle said: Thanks for the best wishes. I guess I'm not doing it. The poor BMS is. 😅 P.s. Incase you're curious, this is a snap shot of how the REVOV batteries maintain the 13.7 float voltage of the battery manufacturer. I'll keep watching them!   5~7mv delta that is a well balanced battery.
January 30, 20251 yr Author 17 hours ago, Marius2001 said: Still happy with the drop-in replacement batteries?   So far so good...😃 I am trying to use some remote monitoring tool from homebug, poor choice of name 😅 (https://homebug.com/product/ebug-blue/) , but no luck... I want to be able to monitor the batteries bms even when remote, over wi-fi. (instead of only when standing next to them) the device only shows the Battery Equalizer (which shows a good ballance), but not the actual battery BMSs in the batteries... I contacted https://homebug.com/ Asking them for support. wish me luck P.S. Locally the 8 cells are between 3,440 and 3.448 Volts and the Battery Monitor is looking at the Battery Equalizer. This i can view remotely thanks to the home bug.  Edited January 30, 20251 yr by BigotedUncle Additional info including images
January 30, 20251 yr Author 19 hours ago, Marius2001 said: Still happy with the drop-in replacement batteries?   P.S. Looks like RCT Zone is now selling the same inverter, but with LiFePo batteries. 🤨 After telling me the inverter won't support LiFePo batteries🤔 Â
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